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SEGMENT REPORTING - Reconciliation of (Loss) Income to EBITDA (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 132	$ 66
Stock-based compensation expense	(42)	(30)
Acquisition and integration related costs	(7)	(22)
Restructuring and related costs	(2)	(7)
Settlements and impairments	0	(8)
EBITDA	81	(1)
Interest income, net	10	38
Other income (expense), net	(1)	(2)
Income (loss) before income taxes	12	(7)
Depreciation and amortization expense	5	5
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA
Acquisition and integration related costs
Restructuring and related costs
Settlements and impairments
EBITDA	81	(1)
Reconciling Item
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets in cost of revenue	(27)	(11)
Amortization of acquired intangible assets in operating expenses	(37)	(17)
Depreciation and other amortization	(14)	(14)
Interest income, net	10	38
Other income (expense), net	$ (1)	$ (2)

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 897	$ 732
Commercial Real Estate Segment
Disaggregation of Revenue [Line Items]
Revenue	472	409
Residential Real Estate Segment
Disaggregation of Revenue [Line Items]
Revenue	425	323
CoStar \| Commercial Real Estate Segment
Disaggregation of Revenue [Line Items]
Revenue	331	305
LoopNet \| Commercial Real Estate Segment
Disaggregation of Revenue [Line Items]
Revenue	85	73
Other Commercial Real Estate \| Commercial Real Estate Segment
Disaggregation of Revenue [Line Items]
Revenue	$ 56	$ 31

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

LEASES - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Leases [Abstract]
Operating lease liabilities	$ 158	$ 161
Less: imputed interest	20	21
Present value of lease liabilities	138	140
Operating Lease, Liability, Current	23	23
Long-term lease liabilities	$ 115	$ 117
Weighted-average remaining lease term in years	5 years
Weighted-average discount rate	4.70%	4.70%
ROU Assets	$ 120	$ 123
Total	10	12
Less: imputed interest	1	1
Present value of lease liabilities	9	11
Less: current portion of lease liabilities	5	5
Long-term lease liabilities	$ 4	$ 6
Weighted-average remaining lease term in years	2 years
Weighted-average discount rate	6.30%	6.30%
ROU Assets	$ 12	$ 13

REVENUE FROM CONTRACTS WITH CUSTOMERS - Commissions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Commissions incurred	$ 52	$ 46
Commissions capitalized in the current period	(34)	(33)
Amortization of deferred commissions costs	30	31
Total commissions expense	$ 48	$ 44

LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used in operating leases	$ 8	$ 11
Financing cash flows used in finance leases	1	1
ROU assets obtained in exchange for new lease obligations:
Operating leases	$ 5	$ 1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Accounting policies are consistent for each operating segment. Principles of Consolidation The condensed consolidated financial statements include CoStar Group, Inc. and all entities in which we have a controlling financial interest. To determine whether such an interest exists, we assess whether the entity qualifies as a VIE. We consolidate VIEs when we are the primary beneficiary. We are deemed the primary beneficiary of a VIE when we have both (a) the power to direct the activities of the VIE that most significantly impact its economic performance and (b) the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. In determining whether we are the primary beneficiary, we consider various factors regarding the nature of our involvement with the VIE, including our economic interests, voting rights, authority to appoint or remove directors, and ability to authorize key decisions. We also analyze the VIE’s design, including its capital structure, cash flows, and classes of shares. As part of the Domain Acquisition, the Company obtained ownership interests in the AOMs, which are considered VIEs for which the Company is the primary beneficiary. Domain introduced the AOMs to incentivize real estate agents to increase their use of Domain's depth products by allowing agents to share in a portion of Domain's earnings in return for placing premium, higher-value advertisements on the Domain platform. Domain provides corporate services to the VIEs under services agreements. In addition, CoStar Group has issued letters of support to the VIEs, committing to provide financial support in the event that the VIEs are unable to meet their liabilities independently.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to revenue recognition, allowance for credit losses, the useful lives and recoverability of long-lived and intangible assets, goodwill impairment assessment, income taxes, accounting for business combinations, stock-based compensation, estimating the Company's incremental borrowing rate for its leases, the determination of stand-alone selling prices of various performance obligations, and contingencies, among others. The Company bases these estimates on historical and anticipated results, trends, and various other assumptions that it believes are reasonable, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses. Actual results could differ from these estimates.
Revenue Recognition	Revenue Recognition Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for refunds and returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Nature of Products and Services The Company derives revenue primarily by (i) providing online marketplaces for professional property management companies, property owners, real estate agents and brokers, and landlords, in each case, typically through a fixed monthly fee for its subscription-based advertising services and (ii) providing access to its proprietary database of commercial real estate information, including benchmarking and analytics for the hospitality industry and analytics for lenders. Other subscription-based services include (i) real estate and lease management solutions to commercial customers and real estate investors and (ii) access to its AI-powered spatial data platform to create high-fidelity and high-accuracy digital twins of physical spaces. Subscription contract rates are generally based on the number of sites, number of users, organization size, the customer’s business focus, geography, the number of properties reported on or analyzed, the number and types of services to which a customer subscribes, the number of properties a customer advertises, the number of digital twins hosted, the number of transactions and average transaction size a broker or agent has closed, and the prominence and placement of a customer's advertised properties in the search results. The Company’s subscription-based licenses, advertising packages, and membership agreements generally renew automatically, and the majority have a term of at least one year. Revenue from subscription-based contracts was approximately 90% and 96% of total revenue for the three months ended March 31, 2026 and 2025, respectively. The Company also derives revenue from transaction-based services, including: (i) providing premium listings for individual properties on our marketplaces, (ii) providing data capture services to create digital twins, (iii) the sale of Matterport cameras and capture equipment, (iv) Ten-X's auctions, and (v) ancillary products and services that are sold on an ad hoc basis. The Company analyzes contracts to determine the appropriate revenue recognition using the following steps: (i) identification of contracts with customers, (ii) identification of distinct performance obligations in the contract, (iii) determination of contract transaction price, (iv) allocation of contract transaction price to the performance obligations, and (v) determination of revenue recognition based on timing of satisfaction of the performance obligations. The Company recognizes revenue upon the satisfaction of its performance obligations (upon transfer of control of promised services to its customers) in an amount that reflects the consideration which it expects to be entitled to in exchange for those services. Revenue from subscription-based services is recognized on a straight-line basis over the term of the agreement. Revenue from premium listings sold on a transactional basis is recognized over the estimated period the advertisements will be active. Revenue from all other transaction-based services is recognized when the promised product or services are delivered, which, in the case of property auctions, is at the time of a successful closing for the sale of the auctioned property. Revenue from product sales is recognized upon control transferring to the customers, which is generally upon shipment. Revenue for sales of Matterport cameras is recorded net of estimates of returns, as buyers are entitled to return the camera within 30 days from the date of purchase for a full refund. These rights are accounted for as variable consideration and recognized as a reduction to the revenue recognized. In limited circumstances, the Company's contracts with customers include promises to transfer multiple services, such as contracts for its subscription-based services and professional services or product sales, digital twin capture services, and subscription-based hosting service. For these contracts, the Company accounts for individual performance obligations separately if they are distinct, which involves the determination of the standalone selling price for each distinct performance obligation. Contract Balances and Other Receivables Deferred revenue results from amounts billed in advance to customers or cash received from customers in advance of the Company's fulfillment of its performance obligations and is recognized as those obligations are satisfied. Contract assets represent a conditional right to consideration for satisfied performance obligations that become a receivable when the conditions are satisfied. Contract assets are generated when contractual billing schedules differ from revenue recognition timing. Assets Recognized from Costs to Obtain a Contract with a Customer Certain sales commissions are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions incurred for obtaining new contracts are deferred and then amortized as selling and marketing expenses (excluding customer base amortization) over the period of benefit that the Company has determined to be three years. The amortization period was determined based on several factors, including the nature of the technology and proprietary data underlying the services being purchased, customer contract renewal rates, and industry competition. Sales commissions that do not represent incremental costs of obtaining a contract, or that would otherwise be amortized over a period of one year or less, are not subject to capitalization.
Cost of Revenues	Cost of Revenue Cost of revenue principally consists of salaries, benefits, bonuses, stock-based compensation expenses, and other indirect costs for the Company's researchers who collect and analyze the real estate data that is the basis for the Company's information, analytics, and online marketplace services and for employees who support these products. Additionally, cost of revenue includes amortization of acquired trade names, technology, and certain other intangible assets; product hosting costs; credit card and other transaction fees relating to processing customer transactions; cost of data from third-party data sources; costs of capture services; and costs of Matterport cameras sold
Foreign Currency Translation	Foreign Currency Translation The Company’s reporting currency is the U.S. dollar. The functional currency for the majority of its operations is the local currency, with the exception of certain international locations for which the functional currency is the British Pound or U.S. dollar. Assets and liabilities denominated in a foreign currency are translated into U.S. dollars using the exchange rates in effect as of the balance sheet date. Gains and losses resulting from translation are included in accumulated other comprehensive income. Currency gains and losses on the translation of intercompany loans made to foreign subsidiaries that are of a long-term investment nature are also included in accumulated other comprehensive income. Gains and losses resulting from transactions denominated in a currency other than the functional currency of the entity are included in other expense, net in the condensed consolidated statements of operations using the average exchange rates in effect during the period.
Income Taxes	Income Taxes Deferred income taxes result from temporary differences between the tax basis of assets and liabilities and the basis reported in the Company’s condensed consolidated financial statements. Deferred tax liabilities and assets are determined based on the difference between the financial statement and the tax basis of assets and liabilities using enacted rates in effect during the year in which the Company expects differences to reverse. Valuation allowances are provided against assets, including net operating losses, if the Company determines it is more likely than not that some portion or all of an asset may not be realized. Interest and penalties related to income tax matters are recognized in income tax expense. The Company has elected to record the GILTI under the current-period cost method. On July 4, 2025, new federal tax legislation, H.R.1, was enacted. The legislation amends U.S. tax law, including provisions related to domestic research and development expenses, the restoration of EBITDA-based interest deduction limitation, and bonus depreciation, among others, and international tax provisions, including eliminating the net deemed tangible income return, decreasing the tax rates and taxable income computations applicable to GILTI and FDII, and permanently increasing the BEAT rate. The Company has assessed the impact of the legislation on its condensed consolidated financial statements and has included the impact of items affecting its forecasted tax rate as part of its income tax expense computed for the three months ended March 31, 2026.
Earnings Per Share	Earnings Per Share Earnings per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period on a basic and diluted basis. The Company’s potentially dilutive securities include outstanding stock options and unvested stock-based awards, which include restricted stock awards, restricted stock units, and Matching RSUs awarded under the MSPP. Shares underlying unvested restricted stock awards that vest based on a performance condition and those that vest based on a performance and market condition that have not been achieved as of the end of the period are not included in the computation of basic or diluted earnings per share. Diluted earnings per share considers the impact of potentially dilutive securities except when the inclusion of the potentially dilutive securities would have an anti-dilutive effect.
Stock-Based Compensation	Stock-Based Compensation Equity instruments issued in exchange for services performed by officers, employees, and directors of the Company are accounted for using a fair value-based method and the fair value of such equity instruments is recognized as expense in the condensed consolidated statements of operations. For stock-based awards that vest over a specific service period, compensation expense is measured based on the fair value of the awards at the grant date and is recognized on a straight-line basis over the service period of the awards, net of an estimated forfeiture rate. For equity instruments that vest based on achievement of a performance condition or both a performance and a market condition, stock-based compensation expense is recognized over the service period of the awards based on the expected achievement of the related performance conditions at the end of each reporting period. If the Company's initial estimates of the achievement of the performance conditions change, the related stock-based compensation expense may fluctuate from period to period based on those estimates. If the performance conditions are not met, no stock-based compensation expense will be recognized and any previously recognized stock-based compensation expense will be reversed. For awards with both a performance and a market condition, the Company estimates the fair value of each equity instrument granted on the date of grant using a Monte-Carlo simulation model. This pricing model uses multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards which includes the recent market price and volatility of the Company's shares. When determining the grant date fair value of all stock-based awards, the Company considers whether it is in possession of any material, non-public information that upon its release would have a material effect on its share price, and if so, whether the observable share price or expected volatility assumptions used in determining the fair value of the awards should be adjusted. The Company estimates the fair value of its performance-based restricted stock awards with market conditions on the date of grant using a Monte-Carlo simulation valuation model. This pricing model uses multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards. Expense is only recorded for awards that are expected to vest, net of estimated forfeitures.
Loss Contingencies and Litigation Expense	Loss Contingencies and Litigation Expense The Company is subject to the possibility of losses from various contingencies, including certain legal proceedings. Significant judgment is necessary to estimate the probability and amount of a loss, if any, from such contingencies. An accrual is made when it is probable that a liability has been incurred or an asset has been impaired, and the amount of loss can be reasonably estimated. In accounting for the resolution of contingencies, significant judgment may be necessary to estimate amounts pertaining to periods prior to the resolution that are charged to operations in the period of resolution and amounts related to future periods. If only a range of estimated losses can be determined, the Company records an amount within the range that, in its judgment, reflects the most likely outcome; if none of the estimates within that range are a better estimate than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period.
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Restricted cash consists of cash deposited as collateral related to a litigation bond in a third-party insured account.
Allowance for Credit Losses	Allowance for Credit Losses The Company maintains an allowance for credit losses to cover its current expected credit losses on its trade receivables and contract assets arising from the failure of customers to make contractual payments. The Company estimates credit losses expected over the life of its trade receivables and contract assets based on historical information combined with current conditions that may affect a customer’s ability to pay. While the Company uses various credit quality metrics, it primarily monitors collectability by reviewing the duration of collection pursuits on its delinquent trade receivables and historical write-off trends. Based on the Company’s experience, the customer's delinquency status is the strongest indicator of the credit quality of the underlying trade receivables. The Company’s policy is to write off trade receivables when they are deemed uncollectible.
Inventories	Inventories Inventories consist primarily of finished goods, assemblies, and raw materials. Assemblies are generally purchased from contract manufacturers. Inventories are valued at the lower of cost or net realizable value. Costs are determined using standard cost, which approximates actual cost on a first-in, first-out basis. The Company assesses the valuation of inventory and periodically adjusts the value for estimated excess and obsolete inventory based upon estimates of future demand and market conditions, as well as damaged or otherwise impaired goods.
Leases	Leases The determination of whether an arrangement contains a lease and the classification of a lease, if applicable, is made at the commencement of the arrangement, at which time the Company also measures and recognizes a ROU asset, representing the Company’s right to use the underlying asset, and a lease liability, representing the Company’s obligation to make lease payments under the terms of the arrangement. For the purposes of recognizing ROU assets and lease liabilities associated with the Company’s leases, the Company has elected the practical expedient to not recognize a ROU asset or lease liability for short-term leases, which are leases with a term of 12 months or less. The lease term is defined as the noncancelable portion of the lease term, plus any periods covered by an option to extend the lease if it is reasonably certain that the option will be exercised. In determining the amount of lease payments used in measuring ROU assets and lease liabilities, the Company has elected the practical expedient not to separate non-lease components from lease components for all classes of underlying assets. Consideration deemed part of the lease payments used to measure ROU assets and lease liabilities generally includes fixed payments and variable payments based on either an index or a rate, offset by lease incentives. Upon commencement, the initial ROU asset also includes any lease prepayments. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The rates implicit within the Company's leases are generally not determinable. Therefore, the Company's incremental borrowing rate is used to determine the present value of lease payments. The determination of the Company’s incremental borrowing rate requires judgment and is determined at lease commencement and is subsequently reassessed upon a modification to the lease arrangement. Lease costs related to the Company's operating leases are generally recognized as a single ratable lease cost over the lease term.
Long-Lived Assets, Intangible Assets and Goodwill	Long-Lived Assets, Intangible Assets, and Goodwill Long-lived assets, such as property and equipment and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds its estimated undiscounted future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company capitalizes interest costs during the construction phase. Capitalized interest is added to the cost of the underlying asset upon substantial completion and amortized over the estimated useful life of the asset. Acquired technology and data, customer base assets, trade names, and other intangible assets are related to the Company’s acquisitions. The Company removes fully amortized intangible assets from the cost and accumulated amortization amounts disclosed. Goodwill is tested for impairment at least annually, on October 1, or more frequently if an event or other circumstance indicates that the fair value of a reporting unit may be below its carrying amount. The Company may first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount or elect to bypass the qualitative assessment. If it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, or the Company elects to bypass the qualitative assessment, the Company then performs a quantitative assessment by determining the fair value of each reporting unit. The estimate of the fair value of each reporting unit is based on a projected discounted cash flow model that includes significant assumptions and estimates, including the discount rate, growth rate, and future financial performance. Assumptions about the discount rate are based on a weighted-average cost of capital for comparable companies. Assumptions about the growth rate and future financial performance of a reporting unit are based on the Company’s forecasts, business plans, economic projections, and anticipated future cash flows. The fair value of each reporting unit is compared to the carrying amount of the reporting unit. If the carrying value of the reporting unit exceeds the fair value, then an impairment loss is recognized for the difference.
Long-Lived Assets, Intangible Assets and Goodwill	Long-Lived Assets, Intangible Assets, and Goodwill Long-lived assets, such as property and equipment and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds its estimated undiscounted future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company capitalizes interest costs during the construction phase. Capitalized interest is added to the cost of the underlying asset upon substantial completion and amortized over the estimated useful life of the asset. Acquired technology and data, customer base assets, trade names, and other intangible assets are related to the Company’s acquisitions. The Company removes fully amortized intangible assets from the cost and accumulated amortization amounts disclosed. Goodwill is tested for impairment at least annually, on October 1, or more frequently if an event or other circumstance indicates that the fair value of a reporting unit may be below its carrying amount. The Company may first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount or elect to bypass the qualitative assessment. If it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, or the Company elects to bypass the qualitative assessment, the Company then performs a quantitative assessment by determining the fair value of each reporting unit. The estimate of the fair value of each reporting unit is based on a projected discounted cash flow model that includes significant assumptions and estimates, including the discount rate, growth rate, and future financial performance. Assumptions about the discount rate are based on a weighted-average cost of capital for comparable companies. Assumptions about the growth rate and future financial performance of a reporting unit are based on the Company’s forecasts, business plans, economic projections, and anticipated future cash flows. The fair value of each reporting unit is compared to the carrying amount of the reporting unit. If the carrying value of the reporting unit exceeds the fair value, then an impairment loss is recognized for the difference.
Leasing Operations and Other Expense, Net	Leasing Operations and Other Expense, Net In February 2024, the Company closed on the purchase of an office tower and the land on which it rests in Arlington, Virginia. In January 2025, the Company relocated its headquarters from Washington, D.C. to Arlington, VA, initially occupying approximately 30% of the building. The Company continues to build out further space in this building to support anticipated growth and expansion of its operations in the coming years. Maintenance, physical facilities, leasing, property management, and other key responsibilities related to property ownership are outsourced to professional real-estate managers. The office tower measures approximately 550,000 rentable square feet. The Company records the third-party rental activity from this building's operations and leases, including building depreciation and operating expenses for space occupied by tenants, as other expense, net in the condensed consolidated statements of operations.
Debt Issuance Costs	Debt Issuance Costs Costs incurred in connection with the issuance of long-term debt are deferred and amortized as interest expense over the term of the related debt using the effective interest method for term debt and on a straight-line basis for revolving debt. The Company made a policy election to classify deferred issuance costs on the revolving credit facility as a long-term asset on its condensed consolidated balance sheets. Upon a refinancing or amendment, previously capitalized debt issuance costs are expensed and included in loss on extinguishment of debt if the Company determines that there has been a substantial modification of the related debt. If the Company determines that there has not been a substantial modification of the related debt, any previously capitalized debt issuance costs are amortized as interest expense over the term of the new debt instrument.
Business Combinations	Business Combinations The Company includes the results of operations of the businesses that it acquires from the date of acquisition. The Company generally allocates the purchase consideration to the tangible assets acquired and liabilities assumed and intangible assets acquired based on their estimated fair values on the date of the acquisition. The purchase price is generally determined based on the fair value of the assets transferred, liabilities assumed, and equity interests issued, after considering any transactions that are separate from the business combination. The excess of the fair value of purchase consideration, the fair value of any NCI in the acquiree, and the fair value of any previous equity interest in the acquiree over the fair values of these identifiable assets and liabilities is recorded as goodwill. In a business combination achieved in stages, the Company shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in results of operations. The Company applies significant assumptions, estimates, and judgments in determining the fair value of assets acquired and liabilities assumed on the acquisition date, especially with respect to intangible assets and contingent liabilities. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired customer bases, acquired technology, acquired trade names, useful lives, royalty rates, and discount rates. Estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. Any adjustments to provisional amounts that are identified during the measurement period, not to exceed one year from the date of acquisition, are recorded in the reporting period in which the adjustment amounts are determined. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings. The Company has elected the practical expedient provided under ASC 805, Business Combinations, which allows for contract assets and liabilities acquired or assumed in an acquisition to be measured in accordance with the accounting framework for revenue from contracts with customers as if the Company had originated the acquired contract. This is an exception to the general requirement to measure assets acquired and liabilities assumed at their fair value on the acquisition date. For a given acquisition, the Company may identify certain pre-acquisition contingencies as of the acquisition date and may extend its review and evaluation of these pre-acquisition contingencies throughout the measurement period in order to obtain sufficient information to assess whether the Company includes these contingencies as part of the fair value estimates of assets acquired and liabilities assumed and, if so, to determine their estimated amounts. If the Company cannot reasonably determine the fair value of a pre-acquisition contingency (non-income tax-related) by the end of the measurement period, which is generally the case given the nature of such matters, the Company will recognize an asset or a liability for such pre-acquisition contingency if: (i) it is probable that an asset existed or a liability had been assumed at the acquisition date and (ii) the amount of the asset or liability can be reasonably estimated. Subsequent to the measurement period, changes in the Company's estimates of such contingencies will affect earnings and could have a material effect on its results of operations and financial position. In addition, uncertain tax positions and tax-related valuation allowances assumed in connection with a business combination are initially estimated as of the acquisition date. The Company reevaluates these items based upon facts and circumstances that existed as of the acquisition date with any adjustments to its preliminary estimates being recorded to goodwill, provided that the Company is within the measurement period. Subsequent to the measurement period, changes to these uncertain tax positions and tax-related valuation allowances will affect the Company's provision for income taxes in its condensed consolidated statements of operations and comprehensive income and could have a material impact on its results of operations and financial position. Transaction costs associated with business combinations are expensed as incurred and are included in general and administrative expenses in the condensed consolidated statements of operations.
Recent Accounting Pronouncements and Not Yet Adopted	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements The Company adopted ASU No. 2025-05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets effective January 1, 2026. This ASU provides a practical expedient for estimating expected credit losses on current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. Under the expedient, entities may assume that current conditions as of the balance sheet date do not change for the remaining life of the asset when developing reasonable and supportable forecasts as part of estimating expected credit losses. The Company adopted the ASU effective January 1, 2026 on a prospective basis and elected the practical expedient for the calculation of current expected credit losses. The adoption did not result in a material impact on the Company's condensed consolidated financial statements and related disclosures. Recent Accounting Pronouncements Not Yet Adopted In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The ASU requires incremental disclosures about specific expense categories, including but not limited to, purchases of inventory, employee compensation, depreciation, amortization, and selling expenses. The amendments are effective for fiscal years beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted and the amendments may be applied either prospectively or retrospectively. Management is currently evaluating this ASU to determine its impact on the Company's disclosures. In May 2025, the FASB issued ASU No. 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity. The ASU revises current guidance for determining the accounting acquirer for a transaction effected primarily by exchanging equity interests in which the legal acquiree is a VIE that meets the definition of a business. The amendments differ from current GAAP because, for certain transactions, they replace the requirement that the primary beneficiary of a VIE is always the acquirer with an assessment that requires an entity to consider the factors to determine which entity is the accounting acquirer. Under the amendments, acquisition transactions in which the legal acquiree is a VIE will, in more instances, result in the same accounting outcomes as economically similar transactions in which the legal acquiree is a voting interest entity. The ASU does not change the accounting for a transaction determined to be a reverse acquisition or a transaction in which the legal acquirer is not a business and is determined to be the accounting acquiree. The new guidance will become effective for interim and annual reporting periods beginning on January 1, 2027, will require a prospective transition method for business combinations that occur after the initial adoption date, and early adoption is permitted. Management is currently evaluating this ASU to determine its impact on the Company's disclosures. In September 2025, the FASB issued ASU No. 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The ASU eliminates all references to prescriptive and sequential software project stages throughout Subtopic 350-40. An entity is required to begin capitalizing software costs when both of the following occur: (1) management has authorized and committed to funding the software project and (2) it is probable that the project will be completed and the software will be used to perform the function intended (referred to as the “probable-to-complete recognition threshold”). The ASU is effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may adopt the new guidance using a prospective transition approach, a modified transition approach that is based on the status of the project and whether software costs were capitalized before the date of adoption, or a retrospective transition approach. Early adoption is permitted as of the beginning of an annual reporting period. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements and related disclosures.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leasing Operations and Other Expense, Net (Details) ft² in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Feb. 29, 2024 ft²
Asset Acquisition [Line Items]
Building occupied (as a percent)				0.30
Current portion	$ 6		$ 6
Non-current portion	34		35
Total deferred lease income	40		$ 41
Lease income	4	$ 5
Less:
Property operating expenses	1	1
Depreciation and amortization expense	3	4
Other expense from leasing operations	0	0
Amortization expense	$ 37	17
Property occupied (as a percent)	0.50
Acquired above-market leases
Less:
Amortization expense	$ 2	$ 1
Arlington, VA
Asset Acquisition [Line Items]
Rentable square feet \| ft²				550

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating activities:
Net income (loss)	$ 3	$ (15)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	82	47
Amortization of deferred commissions costs	30	31
Non-cash lease expense	8	8
Stock-based compensation expense	42	30
Deferred income taxes, net	3	(1)
Credit loss expense	8	10
Other operating activities, net	1	(2)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(42)	(16)
Prepaid expenses, other current assets and other assets	26	7
Deferred commissions	(34)	(34)
Accounts payable and other liabilities	(3)	(22)
Lease liabilities	(7)	(10)
Income taxes payable, net	3	7
Deferred revenue	32	13
Net cash provided by operating activities	152	53
Investing activities:
Proceeds from sale and settlement of investments and other assets	0	204
Purchases of property, equipment, and other assets for new campuses	(45)	(54)
Purchases of property, equipment, and other assets	(9)	(26)
Purchase of equity securities	0
Cash paid for acquisitions, net of cash acquired	0	(750)
Net cash used in investing activities	(54)	(911)
Financing activities:
Repurchase of restricted stock to satisfy tax withholding obligations	(22)	(34)
Repurchases of stock	(505)	(19)
Proceeds from exercise of stock options and employee stock purchase plan	14	7
Other financing activities, net	(1)	(1)
Net cash used in financing activities	(514)	(47)
Effect of foreign currency exchange rates on cash, cash equivalents, and restricted cash	(1)	2
Net decrease in cash, cash equivalents, and restricted cash	(417)	(903)
Cash, cash equivalents, and restricted cash at the beginning of period	1,733	4,681
Cash, cash equivalents, and restricted cash at the end of period	1,316	3,778
Supplemental cash flow disclosures:
Interest paid	14	15
Income taxes (refund) paid, net	(23)	2
Supplemental non-cash investing and financing activities:
Accrued capital expenditures and non-cash landlord incentives	$ 75	$ 103

LONG-TERM DEBT

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

LONG-TERM DEBT

The table below presents the components of outstanding debt (in millions):


	March 31, 2026		December 31, 2025
2.800% Senior Notes due July 15, 2030	$	1,000	$	1,000
Senior Notes unamortized discount and issuance costs	(6)		(7)
Long-term debt, net	$	994	$	993

Senior Notes

On July 1, 2020, the Company issued $1.0 billion aggregate principal amount of 2.800% Senior Notes due July 15, 2030. The Senior Notes were sold to a group of financial institutions as initial purchasers who subsequently resold the Senior Notes to

non-U.S. persons pursuant to Regulation S under the Securities Act, and to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act at a purchase price equal to 99.921% of their principal amount. Interest on the Senior Notes is payable semi-annually in arrears on January 15 and July 15. The Senior Notes may be redeemed in whole or in part by the Company (a) at any time prior to April 15, 2030 at a redemption price equal to 100% of the principal amount of the Senior Notes, plus the Applicable Premium (as calculated in accordance with the indenture governing the Senior Notes), and any accrued and unpaid interest, if any, on the principal amount of Senior Notes being redeemed to, but excluding, the redemption date, and (b) on or after April 15, 2030 at a redemption price equal to 100% of the principal amount of the Senior Notes, plus any accrued and unpaid interest, if any, on the principal amount of Senior Notes being redeemed to, but excluding, the redemption date. The Company’s obligations under the Senior Notes are guaranteed on a senior, unsecured basis by the Company’s domestic wholly owned subsidiaries, and the indenture governing the Senior Notes contains covenants, events of default, and other customary provisions with which the Company was in compliance as of March 31, 2026.

Revolving Credit Facility

On May 24, 2024, the Company entered into the 2024 Credit Agreement, which provides for a $1.1 billion revolving credit facility with a term of five years (maturing May 24, 2029) and a letter of credit sublimit of $20 million from a syndicate of financial institutions and issuing banks. The 2024 Credit Agreement replaces the Company's 2020 Credit Agreement.

Borrowings bear interest at a floating rate, which can be, at the Company’s option, either (a) an alternate base rate plus an applicable rate ranging from 0.125% to 0.750% or (b) a Term SOFR, SONIA rate, or EURIBOR for the specified interest period plus an applicable rate ranging from 1.125% to 1.750%, in each case depending on the Company’s Debt Rating (as defined in the 2024 Credit Agreement).

The 2024 Credit Agreement contains customary affirmative covenants for transactions of this type, including, among others, the provision of financial and other information to the administrative agent, notice to the administrative agent upon the occurrence of certain material events, preservation of existence, maintenance of properties, and compliance with laws, including environmental laws, subject to certain exceptions. The 2024 Credit Agreement contains customary negative covenants, including, among others, restrictions on the ability of the Company and its subsidiaries to merge and consolidate with other companies, restrictions on the ability of certain subsidiaries to incur indebtedness, and restrictions on the ability of the Company and certain subsidiaries to grant liens or security interests on assets, subject to certain exceptions. The 2024 Credit Agreement contains a financial maintenance covenant that requires the Company to maintain a Total Leverage Ratio (as defined in the 2024 Credit Agreement) of less than or equal to 4.50 to 1.00, tested at the end of each fiscal quarter. The 2024 Credit Agreement also provides for a number of customary events of default, including, among others: payment defaults to the lenders, voluntary and involuntary bankruptcy proceedings, covenant defaults, material inaccuracies of representations and warranties, cross-acceleration to other material indebtedness, certain change of control events, material money judgments, and other customary events of default. The occurrence of an event of default could result in the acceleration of obligations and the termination of lending commitments under the 2024 Credit Agreement. The Company was in compliance with the covenants in the 2024 Credit Agreement as of March 31, 2026. As of March 31, 2026, the Company had no amounts drawn under this facility.

The Company had $3 million of deferred debt issuance costs related to the revolving credit facility as of both March 31, 2026 and December 31, 2025. These amounts are included in deposits and other assets on the Company's condensed consolidated balance sheets.

The Company recognized interest expense as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Interest on outstanding borrowings	$	7	$	7
Amortization of Senior Notes discount and issuance costs	1		1
Interest capitalized for construction in process	(5)		(3)
Commitment fees and other	1		1
Total interest expense	$	4	$	6

ACQUISITIONS - Narrative (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions			1 Months Ended					3 Months Ended			12 Months Ended
	Aug. 27, 2025 USD ($)	Feb. 28, 2025 USD ($) $ / shares shares	Aug. 31, 2025 USD ($)	Aug. 31, 2025 AUD ($) $ / shares	Mar. 31, 2025 USD ($)	Feb. 28, 2025 USD ($) $ / shares	Feb. 28, 2025 AUD ($)	Mar. 31, 2026 USD ($) shares	Sep. 30, 2025 $ / shares	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Feb. 28, 2025 $ / shares
Business Combination [Line Items]
Purchase price						$ 285,000,000		$ 0
Goodwill								4,975,000,000			$ 4,944,000,000
Revenue										$ 820,000,000
Net loss										(64,000,000)
Domain \| S 2025 Q3 Dividends
Business Combination [Line Items]
Dividends declared (in dollars per share) \| $ / shares									$ 0.088
Dividends paid (in AUD per share) \| $ / shares									$ 0.088
Domain
Business Combination [Line Items]
Acquired interests, percentage		17.00%				17.00%
Price per share (in AUD per share) \| $ / shares				$ 4.43								$ 4.20
Purchase price						$ 285,000,000	$ 452
Business combination, consideration transferred	$ 1,612,000,000		$ 1,600,000,000	$ 2,500
Issued capital				83.00%
Fair value of previously held equity interests	300,000,000		$ 300,000,000	$ 465
Transaction cost, expense											$ 20,000,000
Goodwill	$ 1,244,000,000
Domain \| Residential Real Estate Segment
Business Combination [Line Items]
Goodwill acquired								994,000,000
Domain \| Commercial Real Estate Segment
Business Combination [Line Items]
Goodwill acquired								250,000,000
Matterport
Business Combination [Line Items]
Price per share (in AUD per share) \| $ / shares		$ 2.75				$ 2.75
Business combination, consideration transferred								$ 1,927,000,000
Exchange ratio of common stock		0.03552
Equity interest issued for acquisition (in shares) \| shares								11.7
Fair value of rollover awards		$ 273,000,000						$ 144,000,000
Goodwill		1,105,000,000				$ 1,105,000,000
Goodwill, expected tax deductible amount		$ 0				$ 0
Transaction costs					$ 18,000,000					$ 18,000,000
Revenue					16,000,000
Net loss					$ 13,000,000
Matterport \| Restricted Stock Units (RSUs)
Business Combination [Line Items]
Equity interest issued for acquisition (in shares) \| shares		2.3
Matterport \| Stock Options
Business Combination [Line Items]
Equity interest issued for acquisition (in shares) \| shares		1.8

ACQUISITIONS - Intangible Assets Acquired (Details) - USD ($) $ in Millions	May 09, 2025	Feb. 28, 2025
Domain
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value	$ 931
Domain \| Customer relationships
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value	$ 625
Estimated Useful Life	20 years
Domain \| Brand and trade names
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value	$ 190
Domain \| Brand and trade names \| Minimum
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Useful Life	5 years
Domain \| Brand and trade names \| Maximum
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Useful Life	15 years
Domain \| Software
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value	$ 116
Domain \| Software \| Minimum
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Useful Life	2 years
Domain \| Software \| Maximum
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Useful Life	5 years
Matterport
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value		$ 527
Matterport \| Customer relationships
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value		$ 140
Estimated Useful Life		5 years
Matterport \| Brand and trade names
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value		$ 92
Estimated Useful Life		15 years
Matterport \| Developed technology
Intangible Asset, Acquired, Finite-Lived [Line Items]
Estimated Fair Value		$ 295
Estimated Useful Life		9 years

ORGANIZATION (Details)	3 Months Ended
ORGANIZATION (Details)	Mar. 31, 2026 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Term of subscription-based license agreements	1 year
Number of business segments	2

INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2026

Intangible Assets, Net (Excluding Goodwill) [Abstract]

INTANGIBLE ASSETS

Intangible assets consist of the following (in millions, except amortization period data):


	March 31, 2026		December 31, 2025		Weighted- Average Amortization Period (in years)
Acquired technology and data	$	474	$	471	8
Accumulated amortization	(72)		(55)
Acquired technology and data, net	402		416

Acquired customer base	1,347		1,330		15
Accumulated amortization	(439)		(403)
Acquired customer base, net	908		927

Acquired trade names and other intangible assets	524		524		14
Accumulated amortization	(151)		(146)
Acquired trade names and other intangible assets, net	373		378

Acquired above-market leases	42		42		9
Accumulated amortization	(15)		(14)
Acquired above-market leases, net	27		28

Acquired in-place leases	31		31		9
Accumulated amortization	(10)		(9)
Acquired in-place leases, net	21		22

Intangible assets, net	$	1,731	$	1,771

Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The Company did not recognize any impairment losses on intangible assets during the three months ended March 31, 2026 or 2025. During the three months ended March 31, 2026, the Company did not have any intangible assets that were fully amortized from the acquired intangible assets and accumulated amortization.

STOCKHOLDERS' EQUITY	3 Months Ended
STOCKHOLDERS' EQUITY	Mar. 31, 2026
Stockholders' Equity Note [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS' EQUITY Prior Stock Repurchase Program In February 2025, the Board of Directors approved the Prior Stock Repurchase Program that authorizes the repurchase of up to $500 million of CoStar Group Shares. During the three months ended March 31, 2025, the Company repurchased 0.2 million CoStar Group Shares for an aggregate cost of $19 million. Subsequently, the Company completed the Prior Stock Repurchase Program, including the use of an accelerated share repurchase agreement entered into in November 2025. In total, the Company repurchased 7.1 million shares for an aggregate cost of $500 million during 2025. The aggregate purchase price of CoStar Group Shares is recorded as treasury stock and presented as a reduction to stockholders' equity. New Stock Repurchase Program In December 2025, the Board of Directors approved a Stock Repurchase Program which authorizes, but does not obligate, the repurchase of up to $1.5 billion of CoStar Group Shares. Stock repurchases may be effected through open market repurchases in compliance with Rule 10b-18 under the Exchange Act or through a trading plan adopted in accordance with Rule 10b5-1 of the Exchange Act. Repurchases may be made from time to time at management's discretion, and the timing and amount of any such repurchases will be determined based on share price, market conditions, legal requirements, and other relevant factors. The program has no time limit and can be discontinued at any time at the Company’s discretion. On February 27, 2026, the Company entered into the 2026 ASR Agreement with a financial institution counterparty to repurchase $500 million of its outstanding common stock. The Company repurchased 11.2 million CoStar Group Shares during the term of the 2026 ASR Agreement based on the volume-weighted average price, net of discount, of $44.27 per share over the duration of the program, which was completed in March 2026. During the three months ended March 31, 2026, the Company also repurchased $5 million of CoStar Group Shares pursuant to a 10b5-1 Plan, resulting in total repurchases of 11.4 million CoStar Group Shares for an aggregate cost of $505 million under the Stock Repurchase Program, including pursuant to the 2026 ASR Agreement. As of March 31, 2026, $995 million remains available for repurchases under the Stock Repurchase Program. Shares of common stock repurchased under the Stock Repurchase Program become treasury stock and are recorded as a reduction to stockholders' equity when the transaction is settled. Direct costs incurred to acquire the shares are included in the total cost of the shares. Preferred Stock The Company has 2.0 million shares of preferred stock, $0.01 par value, authorized for issuance. The Board of Directors may issue the preferred stock from time to time as shares of one or more classes or series. Common Stock The Company has 1.2 billion CoStar Group Shares authorized for issuance. Dividends may be declared and paid on the common stock, subject in all cases to the rights and preferences of the holders of preferred stock and authorization by the Board of Directors. In the event of liquidation or winding up of the Company and after the payment of all preferential amounts required to be paid to the holders of any series of preferred stock, any remaining funds shall be distributed among the holders of the issued and outstanding common stock.

- Definition

The entire disclosure for equity.

+ References

+ Details

SUBSEQUENT EVENTS	3 Months Ended
SUBSEQUENT EVENTS	Mar. 31, 2026
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS The Company has evaluated subsequent events and transactions that occurred after the balance sheet date up to the date that the condensed consolidated financial statements were issued. Based upon this review, the Company did not identify any material subsequent events that required adjustment or disclosure in the condensed consolidated financial statements.

EMPLOYEE BENEFIT PLANS - Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	3,203,725
Granted (in shares)	0
Exercised (in shares)	(887,901)
Canceled or expired (in shares)	0
Outstanding at end of period (in shares)	2,315,824	3,203,725
Exercisable at end of period (in shares)	2,123,056
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 38.32
Granted (in dollars per share)	0
Exercised (in dollars per share)	9.34
Canceled or expired (in dollars per share)	0
Outstanding at end of period (in dollars per share)	49.43	$ 38.32
Exercisable at end of period (in dollars per share)	$ 46.71
Weighted average remaining contract life, outstanding (in years)	4 years	4 years
Weighted average remaining contract life, outstanding, exercisable (in years)	4 years
Aggregate intrinsic value of options outstanding at end of period	$ 16	$ 102
Aggregate intrinsic value of options exercised	50
Aggregate intrinsic value of options exercisable at end of period	$ 16

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net income (loss)	$ 3	$ (15)
Denominator:
Denominator for basic net income (loss) per share — weighted-average outstanding shares (in shares)	413.0	410.5
Effect of dilutive securities:
Stock options, restricted stock awards, and restricted stock units (in shares)	1.0	0.0
Denominator for diluted net income (loss) per share — weighted-average outstanding shares (in shares)	414.0	410.5
Earnings per share - basic - (in dollars per share)	$ 0.01	$ (0.04)
Earnings per share - diluted (in dollars per share)	$ 0.01	$ (0.04)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478666/740-323-65-2

Reference 19: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-6

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-3

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-1

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-11

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-7

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 31: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(9))
-Publisher FASB
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Reference 32: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(1)(d))
-Publisher FASB
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Reference 33: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
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-Publisher FASB
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Reference 34: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
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-Publisher FASB
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Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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Reference 36: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Publisher FASB
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Reference 37: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 38: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 39: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 40: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section S99
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Reference 41: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 42: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 43: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 44: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 45: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 46: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 47: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 48: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 49: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

REVENUE FROM CONTRACTS WITH CUSTOMERS

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

REVENUE FROM CONTRACTS WITH CUSTOMERS

Disaggregated Revenue

Revenue by operating segment and type of service consists of the following (in millions):


	Three Months Ended March 31,
	2026		2025
Commercial Real Estate
CoStar	$	331	$	305
LoopNet	85		73
Other Commercial Real Estate	56		31
Total Commercial Real Estate	472		409
Residential Real Estate	425		323
Total revenue	$	897	$	732

The Company has recast certain prior period disclosures to align with the way it internally manages the business. See Note 2 for additional information.

The Company is domiciled in the U.S. and revenue earned outside the U.S. was $137 million and $48 million for the three months ended March 31, 2026 and 2025, respectively.

Deferred Revenue

Deferred revenue as of March 31, 2026 and December 31, 2025 was as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Deferred revenue	$	237	$	205
Non-current portion	Lease and other long-term liabilities	1		1
Total deferred revenue		$	238	$	206

Changes in deferred revenue for the period were as follows (in millions):


Balance at December 31, 2025	$	206
Revenue recognized in the current period from the amounts in the beginning balance	(104)
New deferrals, net of amounts recognized in the current period	136
Balance at March 31, 2026	$	238

Contract Assets

Contract assets are generated when contractual billing schedules differ from revenue recognition timing and represent a conditional right to consideration for satisfied performance obligations that becomes a receivable when the conditions are satisfied. Contract assets as of March 31, 2026 and December 31, 2025 were as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Prepaid expenses and other current assets	$	6	$	7
Non-current portion	Deposits and other assets	3		3
Total contract assets		$	9	$	10

Unsatisfied Performance Obligations

Remaining contract consideration for which revenue had not been recognized due to unsatisfied performance obligations was approximately $519 million at March 31, 2026, which the Company expects to recognize over the next five years. This amount does not include contract consideration for contracts with a duration of one year or less.

Commissions

Commissions expense is included in selling and marketing expense (excluding customer base amortization) in the Company's condensed consolidated statements of operations. Commissions expense activity for the three months ended March 31, 2026 and 2025 was as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Commissions incurred	$	52	$	46
Commissions capitalized in the current period	(34)		(33)
Amortization of deferred commissions costs	30		31
Total commissions expense	$	48	$	44

The Company did not recognize any impairment losses on commissions during the three months ended March 31, 2026 and 2025.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

INCOME TAXES (Details)	3 Months Ended
INCOME TAXES (Details)	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Effective income tax rate	74.00%	(114.00%)

LEASES

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

LEASES

The Company has operating and finance leases for its office facilities, data centers, and certain vehicles. The Company's leases have remaining terms up to nine years. The leases contain various renewal and termination options. The period that is subject to an option to extend the lease is included in the lease term if it is reasonably certain that the option will be exercised. The period that is subject to an option to terminate the lease is included if it is reasonably certain that the option will not be exercised.

Lease costs related to the Company's operating and finance leases included in the condensed consolidated statements of operations were as follows (in millions):


	Three Months Ended March 31,
Operating lease costs:	2026		2025

Cost of revenue	$	2	$	3
Selling and marketing (excluding customer base amortization)	5		4
Software development	2		2
General and administrative	2		1
Total operating lease costs	11		10
Finance lease costs:
Amortization of ROU assets	1		1
Interest on lease liabilities	—		1
Total finance lease costs	1		2
Total lease costs	$	12	$	12

Finance lease costs primarily relate to vehicles used by the Company's research teams, and the amortization of the ROU assets is recorded to cost of revenue in the condensed consolidated statements of operations. The impact of lease costs related to short-term leases was not material for the three months ended March 31, 2026 and 2025.

Supplemental balance sheet information related to operating leases was as follows (in millions):


Balance	Balance Sheet Location	March 31, 2026			December 31, 2025
Operating lease liabilities		$	158		$	161
Less: imputed interest		20			21
Present value of lease liabilities		138			140
Less: current portion of lease liabilities	Lease liabilities	23			23
Long-term lease liabilities	Lease and other long-term liabilities	$	115		$	117

Weighted-average remaining lease term in years		5			5
Weighted-average discount rate		4.7		%	4.7		%
ROU Assets	Lease right-of-use assets	$	120		$	123

Finance lease liabilities		$	10		$	12
Less: imputed interest		1			1
Present value of lease liabilities		9			11
Less: current portion of lease liabilities	Lease liabilities	5			5
Long-term lease liabilities	Lease and other long-term liabilities	$	4		$	6

Weighted-average remaining lease term in years		2			2
Weighted-average discount rate		6.3		%	6.3		%
ROU Assets	Property and equipment, net	$	12		$	13

Supplemental cash flow information related to leases was as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used in operating leases	$	8	$	11
Financing cash flows used in finance leases	$	1	$	1

ROU assets obtained in exchange for new lease obligations:
Operating leases	$	5	$	1

LEASES

Lease costs related to the Company's operating and finance leases included in the condensed consolidated statements of operations were as follows (in millions):


	Three Months Ended March 31,
Operating lease costs:	2026		2025

Cost of revenue	$	2	$	3
Selling and marketing (excluding customer base amortization)	5		4
Software development	2		2
General and administrative	2		1
Total operating lease costs	11		10
Finance lease costs:
Amortization of ROU assets	1		1
Interest on lease liabilities	—		1
Total finance lease costs	1		2
Total lease costs	$	12	$	12

Supplemental balance sheet information related to operating leases was as follows (in millions):


Balance	Balance Sheet Location	March 31, 2026			December 31, 2025
Operating lease liabilities		$	158		$	161
Less: imputed interest		20			21
Present value of lease liabilities		138			140
Less: current portion of lease liabilities	Lease liabilities	23			23
Long-term lease liabilities	Lease and other long-term liabilities	$	115		$	117

Weighted-average remaining lease term in years		5			5
Weighted-average discount rate		4.7		%	4.7		%
ROU Assets	Lease right-of-use assets	$	120		$	123

Finance lease liabilities		$	10		$	12
Less: imputed interest		1			1
Present value of lease liabilities		9			11
Less: current portion of lease liabilities	Lease liabilities	5			5
Long-term lease liabilities	Lease and other long-term liabilities	$	4		$	6

Weighted-average remaining lease term in years		2			2
Weighted-average discount rate		6.3		%	6.3		%
ROU Assets	Property and equipment, net	$	12		$	13

Supplemental cash flow information related to leases was as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used in operating leases	$	8	$	11
Financing cash flows used in finance leases	$	1	$	1

ROU assets obtained in exchange for new lease obligations:
Operating leases	$	5	$	1

SEGMENT REPORTING

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

SEGMENT REPORTING

Segment Information

The Company manages its business by product portfolios in two operating segments and two reportable segments, with the primary areas of measurement and decision-making being Commercial Real Estate and Residential Real Estate. Segment reporting is aligned with the internal reporting used by the CODM, which is the Company’s Chief Executive Officer. The CODM relies on a management reporting process that provides operating segment revenue, EBITDA, and Adjusted EBITDA for making decisions and assessing performance as the source of the Company’s reportable segments. EBITDA and Adjusted EBITDA are used by management internally to measure operating and management performance and to evaluate the business. The CODM does not review any information regarding total assets by operating segment.

Operating results by segment include items that are directly attributable to each segment and shared expenses such as IT; corporate infrastructure, including facilities; finance; and legal expenses. Shared expenses are allocated based on revenue and headcount. There are no intersegment transactions. The impact of certain items that are not normal, recurring, cash operating expenses necessary to run the operating segment are removed to determine Adjusted EBITDA and include stock-based compensation, acquisition and integration costs, restructuring and related costs, and settlements and impairments.

The Company has recast certain prior period disclosures to align with its reportable segments. See Note 2 for additional information.

Summarized EBITDA and Adjusted EBITDA information by operating segment consists of the following (in millions):


	Three Months Ended March 31,
	2026						2025
	Commercial Real Estate		Residential Real Estate		Total		Commercial Real Estate		Residential Real Estate		Total
Revenue(1)	$	472	$	425	$	897	$	409	$	323	$	732
Less:
Personnel	232		178		410		190		152		342
Marketing	18		209		227		17		199		216
General and administrative(2)	95		84		179		99		76		175
EBITDA	$	127	$	(46)	$	81	$	103	$	(104)	$	(1)
Stock-based compensation expense	29		13		42		22		8		30
Acquisition and integration related costs	4		3		7		20		2		22
Restructuring and related costs	1		1		2		5		2		7
Settlements and impairments	—		—		—		1		7		8
Adjusted EBITDA	$	161	$	(29)	$	132	$	151	$	(85)	$	66
__________________________
(1) See Note 3 for details of revenue disaggregated by segment.
(2) Excludes personnel costs.

The following summarizes stock-based compensation, which is a significant non-cash item included in the personnel costs above, by segment (in millions):


	Three Months Ended March 31,
	2026		2025
Commercial Real Estate	$	29	$	22
Residential Real Estate	13		8
Total	$	42	$	30

The reconciliation of Adjusted EBITDA and EBITDA to income (loss) before income taxes consists of the following (in millions):


	Three Months Ended March 31,
	2026		2025
Adjusted EBITDA	$	132	$	66
Stock-based compensation expense	(42)		(30)
Acquisition and integration related costs	(7)		(22)
Restructuring and related costs	(2)		(7)
Settlements and impairments	—		(8)
EBITDA	$	81	$	(1)
Amortization of acquired intangible assets in cost of revenue	(27)		(11)
Amortization of acquired intangible assets in operating expenses	(37)		(17)
Depreciation and other amortization	(14)		(14)
Interest income, net	10		38
Other expense, net(1)	(1)		(2)
Income (loss) before income taxes	$	12	$	(7)
__________________________
(1) Includes $5 million of depreciation and amortization expense including above-market lease amortization associated with lessor activities for the three months ended March 31, 2026 and 2025.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
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+ Details

LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Long-Term Debt Instruments

The table below presents the components of outstanding debt (in millions):


	March 31, 2026		December 31, 2025
2.800% Senior Notes due July 15, 2030	$	1,000	$	1,000
Senior Notes unamortized discount and issuance costs	(6)		(7)
Long-term debt, net	$	994	$	993

Schedule of Interest Expense

The Company recognized interest expense as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Interest on outstanding borrowings	$	7	$	7
Amortization of Senior Notes discount and issuance costs	1		1
Interest capitalized for construction in process	(5)		(3)
Commitment fees and other	1		1
Total interest expense	$	4	$	6

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

ACQUISITIONS

3 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

ACQUISITIONS

Domain

In February 2025, in connection with the Domain Proposal, the Company acquired approximately 17% of the ordinary shares of Domain, one of Australia's leading property marketplaces, at A$4.20 per share for a total purchase price of A$452 million ($285 million). In May 2025, the Company entered into an agreement to acquire the remaining issued capital of Domain not previously held by CoStar Group by way of scheme of arrangement. In August 2025, the Company completed the Domain Acquisition pursuant to which (i) the Company spent A$2.5 billion ($1.6 billion) to acquire the remaining 83% of Domain's ordinary shares; and (ii) Domain shareholders received total cash consideration of A$4.43 per Domain ordinary share, less a one-time special dividend of A$0.088 per share declared and paid by Domain prior to closing. The Domain Acquisition positions the Company to leverage Domain's portfolio of property brands in Australia and CoStar's technology, scale, and innovation to improve customer experience, value, and access to CoStar's brands and product offerings.

As of the closing of the Domain Acquisition, the fair value of the Company's 17% investment was approximately A$465 million ($300 million), measured based on the fair value implied by the consideration transferred. The acquisition was completed as a step-acquisition.

The total purchase consideration for the Domain Acquisition was $1.6 billion, which consisted of the following (in millions):


	Amount
Cash	$	1,472
Settlement of existing debt	139
Fair value of cash settled equity awards related to pre-combination services	1
Total purchase consideration	$	1,612
Fair value of previously held equity interests	300
	$	1,912

The following table summarizes the amounts recorded for acquired assets and assumed liabilities recorded at their fair value as of the closing date of the Domain Acquisition (in millions):


	Updated Preliminary: August 27, 2025
Cash and cash equivalents	$	15
Accounts receivable	35
Intangible assets	931
Accrued expenses	(27)
Deferred revenue	(14)
Deferred tax liability	(231)
Other assets and (liabilities), net	(2)
Fair value of identifiable net assets acquired	707

Fair value of NCI in Domain’s partially-owned subsidiaries	(39)
Goodwill	1,244
	$	1,912

Generally, the net assets of Domain were recorded at their estimated fair values upon initial consolidation. In valuing the acquired assets, assumed liabilities and NCI, fair value estimates were based primarily on future expected cash flows, market

rate assumptions for contractual obligations, and appropriate discount rates. The key assumptions used in the valuation include discount rates, royalty rates, projected revenue growth rates, customer attrition rates, and profit margins.

The purchase price allocation is preliminary and subject to change during the measurement period as additional information is obtained about the facts and circumstances that existed at closing. Any material adjustments to provisional amounts identified during the measurement period will be recognized and disclosed in the reporting period in which the adjustment amounts are determined. The primary areas that remain subject to additional information include certain tax matters and contingencies.

The following table summarizes the fair values (in millions) of the identifiable intangible assets acquired in the Domain Acquisition, their related estimated useful lives (in years), and their respective amortization methods:


	Estimated Fair Value		Estimated Useful Life	Amortization Method
Customer relationships	$	625	20	Accelerated
Brand and trade names	190		5-15	Straight-line
Software	116		2-5	Straight-line
Total intangible assets	$	931

Goodwill is calculated as the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Specifically, the goodwill recorded as part of the Domain Acquisition includes, but is not limited to: (i) the expected synergies and other benefits that the Company believes will result from combining Domain's operations with the Company's operations and (ii) any intangible assets that do not qualify for separate recognition, such as the assembled workforce. Of the $1,244 million of goodwill recorded as part of the Domain Acquisition, $994 million was allocated to Residential Real Estate and $250 million to Commercial Real Estate, of which none is expected to be deductible for income tax purposes. Transaction costs associated with the Domain Acquisition were $20 million for the year ended December 31, 2025 and consisted primarily of advisory, legal, accounting, and other professional service costs.

Matterport

On February 28, 2025, the Company completed the Matterport Acquisition. Matterport is a leader in the digitization and datafication of the built world. Matterport’s pioneering technology has set the standard for digitizing, accessing, and managing buildings, spaces, and places online. Matterport’s platform, composed of innovative software, spatial data-driven data science, and 3D capture technology, has broken down the barriers that have kept the largest asset class in the world, buildings and physical spaces, offline and underutilized for so long. The Company is integrating Matterport's 3D digital twin technology with its information service products and online marketplaces to allow buyers, sellers, and renters to explore properties with greater depth and insight.

Pursuant to the terms and conditions of the Matterport Merger Agreement, the Company acquired Matterport, with each share of Matterport Common Stock outstanding immediately prior to the closing of the Matterport Acquisition exchanged for (i) 0.03552 of a CoStar Group Share, the Matterport Merger Exchange Ratio, and (ii) $2.75 in cash, with fractional shares of CoStar Group Shares paid in cash.

As part of the Matterport Acquisition, the Company issued certain rollover equity awards to the employees of Matterport, which included approximately 2.3 million shares of restricted stock units and approximately 1.8 million stock option awards. The total fair value of the rollover equity awards was $273 million, of which the portion attributable to services performed prior to the acquisition date was allocated to purchase consideration. The remaining fair value was allocated to future services and will be expensed over the remaining service periods as share-based compensation.

The total purchase consideration for the Matterport Acquisition was $1.9 billion, which consisted of the following (in millions):


	Amount
Cash	$	902
CoStar Group Shares (11.7 million shares)	881
Fair value of rollover awards	144
Total	$	1,927

The following table summarizes the amounts recorded for acquired assets and assumed liabilities recorded at their fair value as of the closing date of the Matterport Acquisition (in millions):


	Final: February 28, 2025
Cash and cash equivalents	$	55
Restricted cash	97
Accounts receivable	13
Available for sale investments	204
Deferred tax assets, net of valuation allowance	69
Goodwill	1,105
Intangible assets	527
Deferred revenue	(32)
Litigation accrual	(99)
Other assets and (liabilities), net	(12)
Fair value of identifiable net assets acquired	$	1,927

Generally, the net assets of Matterport were recorded at their estimated fair values. In valuing the acquired assets and assumed liabilities, fair value estimates were based primarily on future expected cash flows, market rate assumptions for contractual obligations, and appropriate discount rates. The key assumptions used in the valuation include discount rates, royalty rates, projected revenue growth rates, customer attrition rates, and profit margins.

The following table summarizes the fair values (in millions) of the identifiable intangible assets acquired in the Matterport Acquisition, their related estimated useful lives (in years), and their respective amortization methods:


	Estimated Fair Value		Estimated Useful Life	Amortization Method
Developed technology	$	295	9	Straight-line
Customer relationships	140		5	Accelerated
Trade names	92		15	Straight-line
Total intangible assets	$	527

synergies and other benefits that the Company believes will result from combining Matterport's operations with the Company's operations and (ii) any intangible assets that do not qualify for separate recognition, such as the assembled workforce. The $1.1 billion of goodwill recorded as part of the Matterport Acquisition was associated with the Company's North America operating segment prior to the reallocation described in Note 2, of which none is expected to be deductible for income tax purposes. Transaction costs associated with Matterport Acquisition were $18 million during the three months ended March 31, 2025, and consist primarily of legal, accounting, and other professional service costs.

Pro Forma Financial Information (unaudited)

The unaudited pro forma financial information presented below reflects the condensed consolidated results of operations of the Company assuming both the Domain Acquisition and Matterport Acquisition had taken place on January 1, 2024. The unaudited pro forma financial information, as presented below, is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions had not taken place on the dates listed above.

The unaudited pro forma financial information, in the aggregate, was as follows (in millions):


	Three months ended March 31, 2025
Revenue	$	820
Net loss	$	(64)

The material pro forma adjustments primarily consist of incremental amortization expense based on the preliminary fair value of the intangible assets acquired, increased compensation expense relating to the issuance of certain equity plans in connection with the acquisitions, accounting policy alignment adjustments, and the income tax impact of the aforementioned pro forma adjustments.

The impact of the Matterport Acquisition on the Company's revenue and net loss in the condensed consolidated statements of operations from February 28, 2025 through March 31, 2025 was $16 million and $13 million, respectively.

- Definition

The entire disclosure for business combination.

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SEGMENT REPORTING - Narrative (Details) $ in Millions	3 Months Ended
SEGMENT REPORTING - Narrative (Details) $ in Millions	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment	2
Number of reportable segments \| segment	2
Revenue \| $	$ 897	$ 732
Non-US [Member]
Segment Reporting Information [Line Items]
Revenue \| $	$ 137	$ 48

- Definition

+ References

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation and Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency transaction loss	$ 0	$ 4,000,000
Total accumulated other comprehensive income	7,951,000,000		$ 8,371,000,000
Reclassification adjustment	0	0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income	131,000,000	$ (17,000,000)	80,000,000	$ (26,000,000)
Foreign currency translation income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income	$ 131,000,000		$ 80,000,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Revenue by operating segment and type of service consists of the following (in millions):


	Three Months Ended March 31,
	2026		2025
Commercial Real Estate
CoStar	$	331	$	305
LoopNet	85		73
Other Commercial Real Estate	56		31
Total Commercial Real Estate	472		409
Residential Real Estate	425		323
Total revenue	$	897	$	732

Schedule of Contract with Customer, Asset and Liability

Deferred revenue as of March 31, 2026 and December 31, 2025 was as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Deferred revenue	$	237	$	205
Non-current portion	Lease and other long-term liabilities	1		1
Total deferred revenue		$	238	$	206

Changes in deferred revenue for the period were as follows (in millions):


Balance at December 31, 2025	$	206
Revenue recognized in the current period from the amounts in the beginning balance	(104)
New deferrals, net of amounts recognized in the current period	136
Balance at March 31, 2026	$	238

Contract assets as of March 31, 2026 and December 31, 2025 were as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Prepaid expenses and other current assets	$	6	$	7
Non-current portion	Deposits and other assets	3		3
Total contract assets		$	9	$	10

Schedule of Commissions Expense


	Three Months Ended March 31,
	2026		2025
Commissions incurred	$	52	$	46
Commissions capitalized in the current period	(34)		(33)
Amortization of deferred commissions costs	30		31
Total commissions expense	$	48	$	44

INVESTMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025	Feb. 28, 2025
Level 1 \| Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		$ 1,000	$ 1,400
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt outstanding, fair value		$ 900	$ 900
Matterport
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale investments				$ 204
Accrued interest				$ 2
Realized loss	$ 203

INCOME TAXES	3 Months Ended
INCOME TAXES	Mar. 31, 2026
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The income tax provision reflects an effective tax rate of approximately 74% and (114)% for the three months ended March 31, 2026 and 2025, respectively. The increase in the effective tax rate for the three months ended March 31, 2026 was primarily due to the Company generating pre-tax book income for the three months ended March 31, 2026, compared to an overall pre-tax book loss for the three months ended March 31, 2025.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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+ Details

INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended
INTANGIBLE ASSETS - Narrative (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Impairment of intangible assets, finite-lived	$ 0	$ 0

EMPLOYEE BENEFIT PLANS - Assumptions (Details) - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		0.00%
Expected volatility		35.00%
Risk-free interest rate		4.29%
Expected life (in years)		5 years
Weighted-average grant date fair value (in dollars per share)		$ 30.05
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		0.00%
Expected volatility		31.00%
Risk-free interest rate		4.23%
Expected life (in years)		3 years
Weighted-average grant date fair value (in dollars per share)		$ 85.29
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Expected volatility	33.00%
Risk-free interest rate	3.36%
Expected life (in years)	3 years
Weighted-average grant date fair value (in dollars per share)	$ 30.19

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income were as follows (in millions):


	March 31, 2026		December 31, 2025
Foreign currency translation income	$	131	$	80
Total accumulated other comprehensive income	$	131	$	80

Schedule of Calculation of Basic and Diluted Net (loss) income Per Share

The following table sets forth the calculation of basic and diluted earnings per share (in millions, except per share data):


	Three Months Ended March 31,
Numerator:	2026		2025

Net income (loss)	$	3	$	(15)
Denominator:
Denominator for basic earnings per share — weighted-average outstanding shares	413.0		410.5
Effect of dilutive securities:
Stock options, restricted stock awards, and restricted stock units	1.0		—
Denominator for diluted earnings per share — weighted-average outstanding shares	414.0		410.5

Earnings per share — basic	$	0.01	$	(0.04)
Earnings per share — diluted	$	0.01	$	(0.04)

Schedule of Anti-dilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the shares underlying the unvested performance-based restricted stock awards and units and anti-dilutive securities excluded from the basic and diluted earnings per share calculations (in millions):


	Three Months Ended March 31,
	2026	2025
Performance-based restricted stock awards and units	1.8	1.4
Anti-dilutive securities	4.1	2.2

Schedule of Stock-based Compensation Expense for Stock Options and Restricted Stock

Stock-based compensation expense for stock options, restricted stock awards, and restricted stock units issued under equity incentive plans, stock purchases under the ESPP, and DSUs and Matching RSUs awarded under the MSPP included in the Company’s condensed consolidated statements of operations were as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Cost of revenue	$	6	$	4
Selling and marketing (excluding customer base amortization)	5		5
Software development	13		7
General and administrative	18		14
Total stock-based compensation expense	$	42	$	30

Schedule of Restrictions on Cash and Cash Equivalents

Cash, cash equivalents, and restricted cash are included in the following line items in the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in millions):


	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	1,215	$	1,633
Restricted cash	101		100
Total cash, cash equivalents, and restricted cash	$	1,316	$	1,733

Schedule of Financing Receivable, Allowance for Credit Losses

The following table details the activity related to the allowance for credit losses for trade receivables (in millions):


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	29	$	23
Current-period provision for expected credit losses	8		9
Write-offs charged against the allowance	(5)		(7)
Ending balance	$	32	$	25

Schedule of Inventories Related to the Matterport Acquisition

Inventories related to the Matterport Acquisition consisted of the following (in millions):


	March 31, 2026		December 31, 2025
Finished goods	$	8	$	4
Purchased parts and raw materials	6		2
Total inventories	$	14	$	6

Schedule of Deferred Lease Income

Deferred lease income as of March 31, 2026 and December 31, 2025 was as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Other current liabilities	$	6	$	6
Non-current portion	Lease and other long-term liabilities	34		35
Total deferred lease income		$	40	$	41

Schedule of Components of Other (Expense) Income

Components of other expense, net related to leasing operations for the three months ended March 31, 2026 and 2025 were as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Lease income(1)	$	4	$	5
Less:
Property operating expenses	1		1
Depreciation and amortization expense	3		4
Other expense from leasing operations	$	—	$	—
__________________________
(1) Includes $2 million and $1 million of amortization expense of above-market leases for the three months ended March 31, 2026 and 2025, respectively.

INVESTMENTS AND FAIR VALUE MEASUREMENTS	3 Months Ended
INVESTMENTS AND FAIR VALUE MEASUREMENTS	Mar. 31, 2026
Fair Value Disclosures [Abstract]
INVESTMENTS AND FAIR VALUE MEASUREMENTS	INVESTMENTS AND FAIR VALUE MEASUREMENTS The Company categorizes assets and liabilities recorded or disclosed at fair value on the condensed consolidated balance sheets based upon the level of judgment associated with inputs used to measure their fair value. The categories are as follows: Level 1 - Observable inputs such as quoted prices in active markets for identical assets or liabilities. Level 2 - Inputs other than quoted prices in active markets that are either directly or indirectly observable. Level 3 - Unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company's financial assets comprised Level 1 cash equivalents with original maturities of three months or less in the amount of $1.0 billion and $1.4 billion as of March 31, 2026 and December 31, 2025, respectively. The Company had no Level 2 or Level 3 financial assets measured at fair value as of March 31, 2026 and December 31, 2025. Available-for-Sale Debt Securities In connection with the Matterport Acquisition, the Company acquired $204 million of available-for-sale debt securities, inclusive of $2 million of accrued interest. These securities were sold for net proceeds of $203 million, resulting in a negligible realized loss in the three months ended March 31, 2025. Other Financial Instruments The Company holds other financial instruments, including cash deposits, accounts receivable, accounts payable, accrued expenses, and Senior Notes. The carrying value for such financial instruments, other than the Senior Notes, each approximated their fair values as of both March 31, 2026 and December 31, 2025. The estimated fair value of the Company's outstanding Senior Notes using quoted prices from the over-the-counter markets, considered Level 2 inputs, was $900 million as of both March 31, 2026 and December 31, 2025.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
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-Paragraph 6A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
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-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
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-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
-SubTopic 820
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

LEASES (Tables)

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

Schedule of Components of Lease Expense

Lease costs related to the Company's operating and finance leases included in the condensed consolidated statements of operations were as follows (in millions):


	Three Months Ended March 31,
Operating lease costs:	2026		2025

Cost of revenue	$	2	$	3
Selling and marketing (excluding customer base amortization)	5		4
Software development	2		2
General and administrative	2		1
Total operating lease costs	11		10
Finance lease costs:
Amortization of ROU assets	1		1
Interest on lease liabilities	—		1
Total finance lease costs	1		2
Total lease costs	$	12	$	12

Schedule of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information related to operating leases was as follows (in millions):


Balance	Balance Sheet Location	March 31, 2026			December 31, 2025
Operating lease liabilities		$	158		$	161
Less: imputed interest		20			21
Present value of lease liabilities		138			140
Less: current portion of lease liabilities	Lease liabilities	23			23
Long-term lease liabilities	Lease and other long-term liabilities	$	115		$	117

Weighted-average remaining lease term in years		5			5
Weighted-average discount rate		4.7		%	4.7		%
ROU Assets	Lease right-of-use assets	$	120		$	123

Finance lease liabilities		$	10		$	12
Less: imputed interest		1			1
Present value of lease liabilities		9			11
Less: current portion of lease liabilities	Lease liabilities	5			5
Long-term lease liabilities	Lease and other long-term liabilities	$	4		$	6

Weighted-average remaining lease term in years		2			2
Weighted-average discount rate		6.3		%	6.3		%
ROU Assets	Property and equipment, net	$	12		$	13

Schedule of Supplemental Cash Flow Information for Leases

Supplemental cash flow information related to leases was as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used in operating leases	$	8	$	11
Financing cash flows used in finance leases	$	1	$	1

ROU assets obtained in exchange for new lease obligations:
Operating leases	$	5	$	1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Credit Losses for Trade Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 29	$ 23
Current-period provision for expected credit losses	8	9
Write-offs charged against the allowance	(5)	(7)
Ending balance	$ 32	$ 25

COMMITMENTS AND CONTINGENCIES - Contractual Obligations (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Operating lease obligations
Remainder of 2026	$ 20
2027	35
2028	34
2029	26
2030	20
Thereafter	23
Operating lease liabilities	158	$ 161
Finance lease obligations
Remainder of 2026	4
2027	5
2028	1
2029	0
2030	0
Thereafter	0
Total	10	$ 12
Long-term debt principal payments
Remainder of 2026	0
2027	0
2028	0
2029	0
2030	1,000
Thereafter	0
Total	1,000
Long-term debt interest payments
Remainder of 2026	14
2027	28
2028	28
2029	28
2030	28
Thereafter	0
Total	$ 126

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Product Information [Line Items]
Term of subscription-based license agreements	1 year
Capitalized contract costs, amortization period	3 years
Subscription-Based Contracts \| Revenue Benchmark \| Product Concentration Risk
Product Information [Line Items]
Product concentration risk	90.00%	96.00%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

SEGMENT REPORTING - Stock Based Compensation Included in the Personnel Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total	$ 42	$ 30
Operating Segments \| Commercial Real Estate
Segment Reporting Information [Line Items]
Total	29	22
Operating Segments \| Residential Real Estate
Segment Reporting Information [Line Items]
Total	$ 13	$ 8

GOODWILL (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by operating segment consist of the following (in millions):


	Commercial Real Estate		Residential Real Estate		Total
Goodwill, December 31, 2025	$	1,955	2,989		4,944
Acquisitions, including measurement period adjustments	$	—	$	(1)	(1)
Effect of foreign currency translation	$	4	$	28	32
Goodwill, March 31, 2026	$	1,959	3,017		4,975

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

INTANGIBLE ASSETS - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, net	$ 1,731	$ 1,771
Acquired technology and data
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, gross	474	471
Accumulated amortization	(72)	(55)
Finite-lived intangible assets, net	$ 402	416
Weighted- Average Amortization Period (in years)	8 years
Acquired customer base
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, gross	$ 1,347	1,330
Accumulated amortization	(439)	(403)
Finite-lived intangible assets, net	$ 908	927
Weighted- Average Amortization Period (in years)	15 years
Brand and trade names
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, gross	$ 524	524
Accumulated amortization	(151)	(146)
Finite-lived intangible assets, net	$ 373	378
Weighted- Average Amortization Period (in years)	14 years
Acquired above-market leases
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, gross	$ 42	42
Accumulated amortization	(15)	(14)
Finite-lived intangible assets, net	$ 27	28
Weighted- Average Amortization Period (in years)	9 years
Acquired in-place leases
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-lived intangible assets, gross	$ 31	31
Accumulated amortization	(10)	(9)
Finite-lived intangible assets, net	$ 21	$ 22
Weighted- Average Amortization Period (in years)	9 years

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions	Total	Matterport	Stockholders’ Equity Attributable to CoStar Group	Stockholders’ Equity Attributable to CoStar Group Matterport	Common Stock	Common Stock Matterport	Additional Paid-In Capital	Additional Paid-In Capital Matterport	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Equity Attributable to NCI
Beginning balance (in shares) at Dec. 31, 2024					409.5
Beginning balance at Dec. 31, 2024			$ 7,553		$ 4		$ 5,232			$ (26)	$ 2,343	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (15)		(15)								(15)
Other comprehensive income	9		9							9
Exercise of stock options (in shares)					0.1
Exercise of stock options	1		1				1
Restricted stock grants (in shares)					2.3
Restricted stock grants surrendered (in shares)					(0.3)
Restricted stock grants surrendered			(34)				(34)
Employee stock purchase plan (in shares)					0.1
Employee stock purchase plan			6				6
Management stock purchase plan			(1)				(1)
Stock-based compensation expense			30				30
Stock repurchases under stock repurchase programs (in shares)					(0.2)
Stock repurchases under stock repurchase programs	(18)		(18)						$ (18)
Common stock issued for Matterport Acquisition (in shares)						11.7
Common stock issued for Matterport acquisitions and Domain acquisition		$ 1,025		$ 1,025				$ 1,025
Ending balance (in shares) at Mar. 31, 2025					423.2
Ending balance at Mar. 31, 2025			8,556		$ 4		6,259		(18)	(17)	2,328	0
Beginning balance (in shares) at Dec. 31, 2024					409.5
Beginning balance at Dec. 31, 2024			7,553		$ 4		5,232			(26)	2,343	0
Ending balance (in shares) at Dec. 31, 2025					417.9
Ending balance at Dec. 31, 2025	8,371		8,334		$ 4		6,410		(510)	80	2,350	37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3		3								3
Other comprehensive income	51		51							51
Change in NCI	1											1
Exercise of stock options (in shares)					0.9
Exercise of stock options	8		8				8
Restricted stock grants (in shares)					0.1
Restricted stock grants surrendered (in shares)					(0.6)
Restricted stock grants surrendered	(20)		(20)				(20)
Employee stock purchase plan (in shares)					0.1
Employee stock purchase plan	7		7				7
Management stock purchase plan (in shares)					0.1
Management stock purchase plan	(2)		(2)				(2)
Stock-based compensation expense	41		41				41
Stock repurchases under stock repurchase programs (in shares)					(11.4)
Stock repurchases under stock repurchase programs	(509)		(509)				(3)		(506)
Ending balance (in shares) at Mar. 31, 2026					407.1
Ending balance at Mar. 31, 2026	$ 7,951		$ 7,913		$ 4		$ 6,441		$ (1,016)	$ 131	$ 2,353	$ 38

EMPLOYEE BENEFIT PLANS

3 Months Ended

Mar. 31, 2026

EMPLOYEE BENEFIT PLANS

Stock Incentive Plans

In April 2016, the Company's Board of Directors adopted the CoStar Group 2016 Stock Incentive Plan (as amended, the “2016 Plan”), subject to stockholder approval, which was obtained on June 9, 2016. On April 28, 2025, the Board of Directors approved the CoStar Group, Inc. 2025 Stock Incentive Plan (the “2025 Plan”), subject to stockholder approval, which was obtained on June 26, 2025. All shares of common stock that were authorized for issuance under the 2016 Plan that, as of April 28, 2025, remained available for issuance under the 2016 Plan (excluding shares subject to outstanding awards) were rolled into the 2025 Plan and, following stockholder approval of the 2025 Plan, no further grants will be made under the 2016 Plan.

The 2025 Plan provides for the grant of stock options, restricted stock, restricted stock units, and stock appreciation rights to officers, employees, and directors of the Company and its subsidiaries. Stock options granted under the 2025 Plan may be non-qualified or may qualify as incentive stock options. Except in limited circumstances related to a merger or other acquisition, the exercise price for an option may not be less than the fair market value of the Company’s common stock on the date of grant. The vesting period for each grant of options, restricted stock, restricted stock units, and stock appreciation rights under the 2025 Plan is determined by the Board of Directors or a committee thereof and is generally three to four years, subject to minimum vesting periods of at least one year. In some cases, vesting of awards under the 2025 Plan may be based on performance conditions. The Company initially reserved approximately 13.2 million shares of common stock for issuance under the 2025 Plan, which included shares of common stock that were authorized and remained available for issuance under the 2016 Plan as of April 28, 2025. Any shares of common stock subject to (a) outstanding awards under the 2016 Plan as of April 28, 2025 or (b) outstanding awards under the 2025 Plan that cease for any reason to be subject to such awards (other than by reason of exercise or settlement of the awards to the extent they are exercised or settled in vested and nonforfeitable shares) will become authorized and unissued under the 2025 Plan. Unless terminated sooner, the 2025 Plan will terminate in June 2035, but will continue to govern unexercised and unexpired awards issued under the 2025 Plan prior to that date. Approximately 7.8 million shares were available for future grant under the 2025 Plan as of March 31, 2026.

In connection with the Matterport Acquisition, the Company assumed Matterport's 2021 Incentive Award Plan and Matterport's Amended and Restated 2011 Stock Incentive Plan, including outstanding restricted stock units and stock options originally granted by Matterport under the Assumed Matterport Plans to continuing employees. These assumed awards will vest in accordance with their original terms, generally over four years. The Company does not intend to issue further grants under these plans. Shares forfeited due to employee termination or expiration are returned to the share pool. As of March 31, 2026, approximately 2.1 million shares remained available under the Assumed Matterport Plans.

At March 31, 2026, there was approximately $299 million of unrecognized compensation cost related to stock incentive plans, net of estimated forfeitures, which the Company expects to recognize over a weighted-average-period of three years. See Note 2 for further discussion of stock-based compensation expense.

Stock Options

Option activity was as follows:


	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contract Life (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2025	3,203,725	$	38.32	4	$	102
Granted	—	$	—
Exercised	(887,901)	$	9.34		$	50
Canceled or expired	—	$	—
Outstanding at March 31, 2026	2,315,824	$	49.43	4	$	16
Exercisable at March 31, 2026	2,123,056	$	46.71	4	$	16

There were no stock options granted during the three months ended March 31, 2026. The Company uses the Black-Scholes option pricing model to estimate the fair value of the option awards. The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded for the three months ended March 31, 2025:


	Three Months Ended March 31, 2025
Dividend yield	0		%
Expected volatility	35		%
Risk-free interest rate	4.29		%
Expected life (in years)	5
Weighted-average grant date fair value	$	30.05

The expected dividend yield is determined based on the Company's past cash dividend history and anticipated future cash dividend payments. The Company has never declared nor paid any dividends on its common stock and does not anticipate paying any dividends on its common stock during the foreseeable future but intends to retain any earnings for future growth of its business. Expected volatility is calculated based on historical volatility of the daily closing price of the Company's common stock over a period consistent with the expected life of the options granted. The risk-free interest rate is based on the U.S. Treasury rate with terms similar to the expected life of the options granted. The expected life for the options is determined based on multiple factors, including historical employee behavior patterns of exercising options and post-employment termination behavior as well as expected future employee option exercise patterns.

Restricted Stock Awards

Prior to February 2026, the Company granted restricted common stock to certain executive officers, directors, and employees of the Company which vest over a specific service period. Executive officers also received restricted common stock that vests based on the achievement of certain operating performance goals over a three-year performance period. The grant of awards with performance conditions supported the Company’s goal of aligning executive incentives with long-term stockholder value and ensuring that executive officers have a continuing stake in the long-term success of the Company.

The vesting of restricted common stock is subject to continuing employment requirements. Certain performance-based restricted common stock awards are also subject to a market condition such that the actual number of shares that vest at the end of the respective three-year period is determined based on the Company’s achievement of performance goals and an established Company specific TSR factor relative to the S&P 500 Index over the same three-year performance period. At the end of the three-year performance period, if the performance condition is achieved at or above the pre-established threshold, the number of shares earned is further adjusted by a TSR payout percentage, which ranges between 80% and 120%, based on the Company’s TSR performance relative to that of S&P 500 Index over the respective three-year period.

There were no performance-based restricted stock awards with market conditions granted during the three months ended March 31, 2026. The Company estimates the fair value of its performance-based restricted stock awards with market conditions on the date of grant using a Monte-Carlo simulation valuation model. This pricing model uses multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards. Expense is only recorded for awards that are expected to vest, net of estimated forfeitures. The assumptions used to estimate the fair value of performance-based restricted stock awards with market conditions granted in the three months ended March 31, 2025 were as follows:


	Three Months Ended March 31, 2025
Dividend yield	0		%
Expected volatility	31		%
Risk-free interest rate	4.23		%
Expected life (in years)	3
Weighted-average grant date fair value	$	85.29

The expected dividend yield is determined based on the Company's past cash dividend history and anticipated future cash dividend payments. The Company has never declared nor paid any dividends on its common stock and does not anticipate paying any dividends on its common stock during the foreseeable future but intends to retain any earnings for future growth of its business. Expected volatility is calculated based on historical volatility of the daily closing price of the common stock of the companies within the S&P 500 Index over a period consistent with the expected life of the awards. The risk-free interest rate is based on the U.S. Treasury rate with terms similar to the expected life of the awards. The expected life is consistent with the performance measurement period of the awards.

As of March 31, 2026, the Company determined that it was probable that at least the minimum performance goals associated with performance-based restricted stock awards with market conditions granted during 2024 and 2025 would be met by their forfeiture dates. The Company recorded a total of approximately $6 million and $1 million of stock-based compensation expense related to restricted stock awards with performance and market conditions for the three months ended March 31, 2026 and 2025, respectively. As of March 31, 2026, the Company expects to record aggregate stock-based compensation expense of approximately $19 million for performance-based restricted stock awards over the remainder of 2026 and in 2027 and 2028.

The following table presents unvested restricted stock awards activity for the three months ended March 31, 2026:


	Restricted Stock Awards — without Market Condition			Restricted Stock Awards — with Market Condition
	Number of Shares	Weighted-Average Grant Date Fair Value per Share		Number of Shares	Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock awards at December 31, 2025	3,643,210	$	78.32	996,000	$	84.93
Granted	1,246	$	57.15	—	$	—
Vested	(981,553)	$	75.22	(69,364)	$	81.58
Canceled	(42,654)	$	77.57	(170,876)	$	81.58
Unvested restricted stock awards at March 31, 2026	2,620,249	$	79.58	755,760	$	86.00

Restricted Stock Units

The Company grants restricted stock units to certain executive officers, directors, and employees of the Company which vest over a specific service period. Executive officers also receive restricted stock units that vest based on the achievement of certain operating performance goals and market conditions. The grant of units with performance conditions supports the

Company’s goal of aligning executive incentives with long-term stockholder value and ensuring that executive officers have a continuing stake in the long-term success of the Company.

The vesting of restricted stock units is subject to continuing employment requirements. Certain performance-based restricted stock units are subject to a market condition such that the actual number of shares that vest at the end of the respective three-year period is determined based on the Company’s achievement of performance goals and an established Company specific TSR factor relative to the S&P 500 Index over the same three-year performance period. At the end of the three-year performance period, the number of shares of the Company’s common stock to be issued is determined by the achievement of the performance condition at or above the pre-established threshold and a TSR payout percentage, which ranges between 50% and 250%, based on the Company’s TSR performance relative to that of S&P 500 Index over the respective three-year period.

The Company estimates the fair value of its performance-based restricted stock units with market conditions on the date of grant using a Monte-Carlo simulation valuation model. This pricing model uses multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards. Expense is only recorded for units that are expected to vest, net of estimated forfeitures.

The assumptions used to estimate the fair value of performance-based restricted stock units with market conditions were as follows:


	Three Months Ended March 31, 2026
Dividend yield	0		%
Expected volatility	33		%
Risk-free interest rate	3.36		%
Expected life (in years)	3
Weighted-average grant date fair value	$	30.19

As of March 31, 2026, the Company determined that it was probable that at least the minimum performance goals associated with performance-based restricted stock units with market conditions granted during 2026 would be met by their forfeiture dates. As of March 31, 2026, the Company expects to record an aggregate stock-based compensation expense of approximately $19 million for performance-based restricted stock units over the remainder of 2026 and in 2027, 2028, and 2029.

The following table presents unvested restricted stock units activity for the three months ended March 31, 2026:


	Restricted Stock Units — without Market Condition			Restricted Stock Units — with Market Condition
	Number of Units	Weighted-Average Grant Date Fair Value per Share		Number of Units	Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock units at December 31, 2025	714,920	$	76.09	—	$	—
Granted	1,653,872	$	48.14	642,603	$	41.02
Vested	(97,035)	$	75.33	—	$	—
Canceled	(61,787)	$	72.82	—	$	—
Unvested restricted stock units at March 31, 2026	2,209,970	$	55.30	642,603	$	41.02

LONG-TERM DEBT - Outstanding Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Jul. 01, 2020
Debt Instrument [Line Items]
Senior Notes unamortized discount and issuance costs	$ (6)	$ (7)
Long-term debt, net	994	993
2.800% Senior Notes due July 15, 2030
Debt Instrument [Line Items]
2.800% Senior Notes due July 15, 2030	$ 1,000	$ 1,000
Stated interest rate (as a percent)	2.80%		2.80%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References + Details

ACQUISITIONS - Pro Forma Financial Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Revenue	$ 820
Net loss	$ (64)

ORGANIZATION	3 Months Ended
ORGANIZATION	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION	ORGANIZATION CoStar Group (the "Company") is a leading global provider of real estate information, analytics, online marketplaces, and 3D digital twin technology. The Company has created and compiled a standardized platform of real estate information and analytics and online marketplaces where industry professionals, consumers of real estate, and the related business communities can continuously interact and facilitate transactions by efficiently accessing and exchanging accurate and standardized real estate-related information. The Company's service offerings span all property types, including office, residential, retail, industrial, multifamily, land, mixed-use, and hospitality. The Company's services are typically distributed to its customers under subscription-based agreements that generally renew automatically and have a minimum term of one year. The Company operates within two operating segments, which are Commercial Real Estate and Residential Real Estate. The Company acquired Matterport and Domain in February 2025 and August 2025, respectively. See Note 4 for further discussion of these acquisitions.

LEASES - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
LEASES - Lease Cost (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2025
Operating lease costs:
Total operating lease costs	$ 11	$ 10
Finance lease costs:
Amortization of ROU assets	1	1
Interest on lease liabilities	0	1
Total finance lease costs	1	2
Total lease costs	12	12
Cost of revenue
Operating lease costs:
Total operating lease costs	2	3
Selling and marketing (excluding customer base amortization)
Operating lease costs:
Total operating lease costs	5	4
Software development
Operating lease costs:
Total operating lease costs	2	2
General and administrative
Operating lease costs:
Total operating lease costs	$ 2	$ 1

GOODWILL - Narrative (Details) - USD ($)	3 Months Ended
GOODWILL - Narrative (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025
Goodwill [Abstract]
Goodwill, impairment loss	$ 0	$ 0

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets and Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 206
Revenue recognized in the current period from the amounts in the beginning balance	(104)
New deferrals, net of amounts recognized in the current period	136
Ending balance	$ 238

COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions				3 Months Ended
	Apr. 22, 2025	Aug. 14, 2024	May 28, 2024	Mar. 31, 2026	Feb. 28, 2025
Business Combination [Line Items]
Operating leases not yet commenced with aggregate rent payments				$ 37
Amount awarded to plaintiff	$ 79		$ 79
Potential damages sought				17
Litigation expense		$ 95
Matterport
Business Combination [Line Items]
Litigation accrual				$ 99	$ 99
Minimum
Business Combination [Line Items]
Operating lease terms (in years)				5 years
Maximum
Business Combination [Line Items]
Operating lease terms (in years)				6 years

ACQUISITIONS - Purchase Consideration Matterport Acquisition (Details) - Matterport - USD ($) shares in Millions, $ in Millions		3 Months Ended
	Feb. 28, 2025	Mar. 31, 2026
Business Combination [Line Items]
Cash		$ 902
CoStar Group Shares (11.7 million shares)		$ 881
Equity interest issued for acquisition (in shares)		11.7
Fair value of rollover awards	$ 273	$ 144
Total		$ 1,927

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

ACQUISITIONS (Tables)

3 Months Ended

Mar. 31, 2026

Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]

Schedule of Purchase Consideration

The total purchase consideration for the Domain Acquisition was $1.6 billion, which consisted of the following (in millions):


	Amount
Cash	$	1,472
Settlement of existing debt	139
Fair value of cash settled equity awards related to pre-combination services	1
Total purchase consideration	$	1,612
Fair value of previously held equity interests	300
	$	1,912

The total purchase consideration for the Matterport Acquisition was $1.9 billion, which consisted of the following (in millions):


	Amount
Cash	$	902
CoStar Group Shares (11.7 million shares)	881
Fair value of rollover awards	144
Total	$	1,927

Schedule of Business Combination, Recognized Asset Acquired and Liability Assumed

The following table summarizes the amounts recorded for acquired assets and assumed liabilities recorded at their fair value as of the closing date of the Domain Acquisition (in millions):


	Updated Preliminary: August 27, 2025
Cash and cash equivalents	$	15
Accounts receivable	35
Intangible assets	931
Accrued expenses	(27)
Deferred revenue	(14)
Deferred tax liability	(231)
Other assets and (liabilities), net	(2)
Fair value of identifiable net assets acquired	707

Fair value of NCI in Domain’s partially-owned subsidiaries	(39)
Goodwill	1,244
	$	1,912

The following table summarizes the amounts recorded for acquired assets and assumed liabilities recorded at their fair value as of the closing date of the Matterport Acquisition (in millions):


	Final: February 28, 2025
Cash and cash equivalents	$	55
Restricted cash	97
Accounts receivable	13
Available for sale investments	204
Deferred tax assets, net of valuation allowance	69
Goodwill	1,105
Intangible assets	527
Deferred revenue	(32)
Litigation accrual	(99)
Other assets and (liabilities), net	(12)
Fair value of identifiable net assets acquired	$	1,927

Schedule of Business Combination, Intangible Asset, Acquired, Finite-Lived


	Estimated Fair Value		Estimated Useful Life	Amortization Method
Customer relationships	$	625	20	Accelerated
Brand and trade names	190		5-15	Straight-line
Software	116		2-5	Straight-line
Total intangible assets	$	931


	Estimated Fair Value		Estimated Useful Life	Amortization Method
Developed technology	$	295	9	Straight-line
Customer relationships	140		5	Accelerated
Trade names	92		15	Straight-line
Total intangible assets	$	527

Schedule of Unaudited Pro Forma Financial Information

The unaudited pro forma financial information, in the aggregate, was as follows (in millions):


	Three months ended March 31, 2025
Revenue	$	820
Net loss	$	(64)

- Definition

Tabular disclosure of business combination. Includes, but is not limited to, recognized asset and liability.

+ References + Details

STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		12 Months Ended
	Feb. 27, 2026	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Feb. 28, 2025
Subsidiary, Sale of Stock [Line Items]
Share repurchase program authorized		$ 5		$ 1,500	$ 500
Treasury Stock, Value, Acquired, Cost Method		$ 509	$ 18
Preferred stock authorized for issuance (in shares)		2.0
Preferred stock, par value (in dollars per share)		$ 0.01
Common stock authorized for issuance (in shares)		1,200.0
Accelerated Share Repurchase Agreement
Subsidiary, Sale of Stock [Line Items]
Stock repurchases under stock repurchase programs (in shares)	11.2	11.4	0.2	7.1
Treasury Stock, Value, Acquired, Cost Method	$ 500	$ 505	$ 19	$ 500
Volume-weighted average price (in dollar per shares)	$ 44.27
Share repurchase program, remaining authorized, amount		$ 995

Cover page - shares	3 Months Ended
Cover page - shares	Mar. 31, 2026	Apr. 27, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	0-24531
Entity Registrant Name	CoStar Group, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-2091509
Entity Address, Address Line One	1201 Wilson Blvd
Entity Address, City or Town	Arlington
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22209
City Area Code	(202)
Local Phone Number	346-6500
Title of 12(b) Security	Common Stock ($0.01 par value)
Trading Symbol	CSGP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		408,355,715
Entity Central Index Key	0001057352
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Accounting policies are consistent for each operating segment.

Principles of Consolidation

The condensed consolidated financial statements include CoStar Group, Inc. and all entities in which we have a controlling financial interest. To determine whether such an interest exists, we assess whether the entity qualifies as a VIE.

We consolidate VIEs when we are the primary beneficiary. We are deemed the primary beneficiary of a VIE when we have both (a) the power to direct the activities of the VIE that most significantly impact its economic performance and (b) the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE.

In determining whether we are the primary beneficiary, we consider various factors regarding the nature of our involvement with the VIE, including our economic interests, voting rights, authority to appoint or remove directors, and ability to authorize key decisions. We also analyze the VIE’s design, including its capital structure, cash flows, and classes of shares.

As part of the Domain Acquisition, the Company obtained ownership interests in the AOMs, which are considered VIEs for which the Company is the primary beneficiary. Domain introduced the AOMs to incentivize real estate agents to increase their use of Domain's depth products by allowing agents to share in a portion of Domain's earnings in return for placing premium, higher-value advertisements on the Domain platform. Domain provides corporate services to the VIEs under services agreements. In addition, CoStar Group has issued letters of support to the VIEs, committing to provide financial support in the event that the VIEs are unable to meet their liabilities independently.

See Note 4 for additional details regarding the Domain Acquisition.

Interim Financial Statements

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with GAAP for interim financial information. In the opinion of the Company’s management, the financial statements reflect all adjustments, consisting only of a normal recurring nature, necessary to present fairly the Company’s financial position at March 31, 2026 and December 31, 2025, the results of its operations for the three months ended March 31, 2026 and 2025, its comprehensive income (loss) for the three months ended March 31, 2026 and 2025, its changes in stockholders' equity for the three months ended March 31, 2026 and 2025, and its cash flows for the three months ended March 31, 2026 and 2025.

Certain notes and other information have been condensed or omitted from the interim financial statements presented in this Report. Therefore, these financial statements should be read in conjunction with the Company’s 2025 Form 10-K.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to revenue recognition, allowance for credit losses, the useful lives and recoverability of long-lived and intangible assets, goodwill impairment assessment, income taxes, accounting for business combinations, stock-based compensation, estimating the Company's incremental borrowing rate for its leases, the determination of stand-alone selling prices of various performance obligations, and contingencies, among others. The Company bases these estimates on historical and anticipated results, trends, and various other assumptions that it believes are reasonable, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenue and expenses. Actual results could differ from these estimates.

Revenue Recognition

Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of products and services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for refunds and returns and any taxes collected from customers, which are subsequently remitted to governmental authorities.

Nature of Products and Services

The Company derives revenue primarily by (i) providing online marketplaces for professional property management companies, property owners, real estate agents and brokers, and landlords, in each case, typically through a fixed monthly fee for its subscription-based advertising services and (ii) providing access to its proprietary database of commercial real estate information, including benchmarking and analytics for the hospitality industry and analytics for lenders. Other subscription-based services include (i) real estate and lease management solutions to commercial customers and real estate investors and (ii) access to its AI-powered spatial data platform to create high-fidelity and high-accuracy digital twins of physical spaces.

Subscription contract rates are generally based on the number of sites, number of users, organization size, the customer’s business focus, geography, the number of properties reported on or analyzed, the number and types of services to which a customer subscribes, the number of properties a customer advertises, the number of digital twins hosted, the number of transactions and average transaction size a broker or agent has closed, and the prominence and placement of a customer's advertised properties in the search results. The Company’s subscription-based licenses, advertising packages, and membership agreements generally renew automatically, and the majority have a term of at least one year. Revenue from subscription-based contracts was approximately 90% and 96% of total revenue for the three months ended March 31, 2026 and 2025, respectively.

The Company also derives revenue from transaction-based services, including: (i) providing premium listings for individual properties on our marketplaces, (ii) providing data capture services to create digital twins, (iii) the sale of Matterport cameras and capture equipment, (iv) Ten-X's auctions, and (v) ancillary products and services that are sold on an ad hoc basis.

The Company analyzes contracts to determine the appropriate revenue recognition using the following steps: (i) identification of contracts with customers, (ii) identification of distinct performance obligations in the contract, (iii) determination of contract transaction price, (iv) allocation of contract transaction price to the performance obligations, and (v) determination of revenue recognition based on timing of satisfaction of the performance obligations.

The Company recognizes revenue upon the satisfaction of its performance obligations (upon transfer of control of promised services to its customers) in an amount that reflects the consideration which it expects to be entitled to in exchange for those services. Revenue from subscription-based services is recognized on a straight-line basis over the term of the agreement. Revenue from premium listings sold on a transactional basis is recognized over the estimated period the advertisements will be active. Revenue from all other transaction-based services is recognized when the promised product or services are delivered, which, in the case of property auctions, is at the time of a successful closing for the sale of the auctioned property. Revenue from product sales is recognized upon control transferring to the customers, which is generally upon shipment. Revenue for sales of Matterport cameras is recorded net of estimates of returns, as buyers are entitled to return the camera within 30 days from the date of purchase for a full refund. These rights are accounted for as variable consideration and recognized as a reduction to the revenue recognized.

In limited circumstances, the Company's contracts with customers include promises to transfer multiple services, such as contracts for its subscription-based services and professional services or product sales, digital twin capture services, and subscription-based hosting service. For these contracts, the Company accounts for individual performance obligations separately if they are distinct, which involves the determination of the standalone selling price for each distinct performance obligation.

Contract Balances and Other Receivables

Deferred revenue results from amounts billed in advance to customers or cash received from customers in advance of the Company's fulfillment of its performance obligations and is recognized as those obligations are satisfied.

Contract assets represent a conditional right to consideration for satisfied performance obligations that become a receivable when the conditions are satisfied. Contract assets are generated when contractual billing schedules differ from revenue recognition timing.

Assets Recognized from Costs to Obtain a Contract with a Customer

Certain sales commissions are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions incurred for obtaining new contracts are deferred and then amortized as selling and marketing expenses (excluding customer base amortization) over the period of benefit that the Company has determined to be three years. The amortization period was determined based on several factors, including the nature of the technology and proprietary data underlying the services being purchased, customer contract renewal rates, and industry competition. Sales commissions that do not represent incremental costs of obtaining a contract, or that would otherwise be amortized over a period of one year or less, are not subject to capitalization.

See Note 3 for further discussion of the Company's revenue recognition.

Cost of Revenue

Cost of revenue principally consists of salaries, benefits, bonuses, stock-based compensation expenses, and other indirect costs for the Company's researchers who collect and analyze the real estate data that is the basis for the Company's information, analytics, and online marketplace services and for employees who support these products. Additionally, cost of revenue includes amortization of acquired trade names, technology, and certain other intangible assets; product hosting costs; credit card and other transaction fees relating to processing customer transactions; cost of data from third-party data sources; costs of capture services; and costs of Matterport cameras sold

Foreign Currency Translation

The Company’s reporting currency is the U.S. dollar. The functional currency for the majority of its operations is the local currency, with the exception of certain international locations for which the functional currency is the British Pound or U.S. dollar. Assets and liabilities denominated in a foreign currency are translated into U.S. dollars using the exchange rates in effect as of the balance sheet date. Gains and losses resulting from translation are included in accumulated other comprehensive income. Currency gains and losses on the translation of intercompany loans made to foreign subsidiaries that are of a long-term investment nature are also included in accumulated other comprehensive income. Gains and losses resulting from transactions denominated in a currency other than the functional currency of the entity are included in other expense, net in the condensed consolidated statements of operations using the average exchange rates in effect during the period. The Company recognized an

immaterial net foreign currency loss for the three months ended March 31, 2026 and a net foreign currency loss of $4 million for the three months ended March 31, 2025.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income were as follows (in millions):


	March 31, 2026		December 31, 2025
Foreign currency translation income	$	131	$	80
Total accumulated other comprehensive income	$	131	$	80

There were no amounts reclassified out of accumulated other comprehensive income to the condensed consolidated statements of operations for the three months ended March 31, 2026 and 2025.

Income Taxes

Deferred income taxes result from temporary differences between the tax basis of assets and liabilities and the basis reported in the Company’s condensed consolidated financial statements. Deferred tax liabilities and assets are determined based on the difference between the financial statement and the tax basis of assets and liabilities using enacted rates in effect during the year in which the Company expects differences to reverse. Valuation allowances are provided against assets, including net operating losses, if the Company determines it is more likely than not that some portion or all of an asset may not be realized. Interest and penalties related to income tax matters are recognized in income tax expense.

The Company has elected to record the GILTI under the current-period cost method.

On July 4, 2025, new federal tax legislation, H.R.1, was enacted. The legislation amends U.S. tax law, including provisions related to domestic research and development expenses, the restoration of EBITDA-based interest deduction limitation, and bonus depreciation, among others, and international tax provisions, including eliminating the net deemed tangible income return, decreasing the tax rates and taxable income computations applicable to GILTI and FDII, and permanently increasing the BEAT rate. The Company has assessed the impact of the legislation on its condensed consolidated financial statements and has included the impact of items affecting its forecasted tax rate as part of its income tax expense computed for the three months ended March 31, 2026.

See Note 10 for further discussion of the Company's accounting for income taxes.

Earnings Per Share

Earnings per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period on a basic and diluted basis.

The following table sets forth the calculation of basic and diluted earnings per share (in millions, except per share data):


	Three Months Ended March 31,
Numerator:	2026		2025

Net income (loss)	$	3	$	(15)
Denominator:
Denominator for basic earnings per share — weighted-average outstanding shares	413.0		410.5
Effect of dilutive securities:
Stock options, restricted stock awards, and restricted stock units	1.0		—
Denominator for diluted earnings per share — weighted-average outstanding shares	414.0		410.5

Earnings per share — basic	$	0.01	$	(0.04)
Earnings per share — diluted	$	0.01	$	(0.04)

The Company’s potentially dilutive securities include outstanding stock options and unvested stock-based awards, which include restricted stock awards, restricted stock units, and Matching RSUs awarded under the MSPP. Shares underlying unvested restricted stock awards that vest based on a performance condition and those that vest based on a performance and market condition that have not been achieved as of the end of the period are not included in the computation of basic or diluted earnings per share. Diluted earnings per share considers the impact of potentially dilutive securities except when the inclusion of the potentially dilutive securities would have an anti-dilutive effect.


	Three Months Ended March 31,
	2026	2025
Performance-based restricted stock awards and units	1.8	1.4
Anti-dilutive securities	4.1	2.2

Stock-Based Compensation

Equity instruments issued in exchange for services performed by officers, employees, and directors of the Company are accounted for using a fair value-based method and the fair value of such equity instruments is recognized as expense in the condensed consolidated statements of operations.

For stock-based awards that vest over a specific service period, compensation expense is measured based on the fair value of the awards at the grant date and is recognized on a straight-line basis over the service period of the awards, net of an estimated forfeiture rate. For equity instruments that vest based on achievement of a performance condition or both a performance and a market condition, stock-based compensation expense is recognized over the service period of the awards based on the expected achievement of the related performance conditions at the end of each reporting period. If the Company's initial estimates of the achievement of the performance conditions change, the related stock-based compensation expense may fluctuate from period to period based on those estimates. If the performance conditions are not met, no stock-based compensation expense will be recognized and any previously recognized stock-based compensation expense will be reversed. For awards with both a performance and a market condition, the Company estimates the fair value of each equity instrument granted on the date of grant using a Monte-Carlo simulation model. This pricing model uses multiple simulations to evaluate the probability of achieving the market condition to calculate the fair value of the awards which includes the recent market price and volatility of the Company's shares. When determining the grant date fair value of all stock-based awards, the Company considers whether it is in possession of any material, non-public information that upon its release would have a material effect on its share price, and if so, whether the observable share price or expected volatility assumptions used in determining the fair value of the awards should be adjusted.


	Three Months Ended March 31,
	2026		2025
Cost of revenue	$	6	$	4
Selling and marketing (excluding customer base amortization)	5		5
Software development	13		7
General and administrative	18		14
Total stock-based compensation expense	$	42	$	30

Loss Contingencies and Litigation Expense

The Company is subject to the possibility of losses from various contingencies, including certain legal proceedings. Significant judgment is necessary to estimate the probability and amount of a loss, if any, from such contingencies. An accrual is made when it is probable that a liability has been incurred or an asset has been impaired, and the amount of loss can be reasonably estimated. In accounting for the resolution of contingencies, significant judgment may be necessary to estimate amounts pertaining to periods prior to the resolution that are charged to operations in the period of resolution and amounts related to future periods. If only a range of estimated losses can be determined, the Company records an amount within the range that, in its judgment, reflects the most likely outcome; if none of the estimates within that range are a better estimate than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period.

Cash, Cash Equivalents, and Restricted Cash

The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Restricted cash consists of cash deposited as collateral related to a litigation bond in a third-party insured account. See Note 11 for further discussion regarding the Company's litigation.

Cash, cash equivalents, and restricted cash are included in the following line items in the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in millions):


	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	1,215	$	1,633
Restricted cash	101		100
Total cash, cash equivalents, and restricted cash	$	1,316	$	1,733

Allowance for Credit Losses

The Company maintains an allowance for credit losses to cover its current expected credit losses on its trade receivables and contract assets arising from the failure of customers to make contractual payments. The Company estimates credit losses expected over the life of its trade receivables and contract assets based on historical information combined with current conditions that may affect a customer’s ability to pay. While the Company uses various credit quality metrics, it primarily monitors collectability by reviewing the duration of collection pursuits on its delinquent trade receivables and historical write-off trends. Based on the Company’s experience, the customer's delinquency status is the strongest indicator of the credit quality of the underlying trade receivables. The Company’s policy is to write off trade receivables when they are deemed uncollectible.

The following table details the activity related to the allowance for credit losses for trade receivables (in millions):


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	29	$	23
Current-period provision for expected credit losses	8		9
Write-offs charged against the allowance	(5)		(7)
Ending balance	$	32	$	25

Inventories

Inventories consist primarily of finished goods, assemblies, and raw materials. Assemblies are generally purchased from contract manufacturers. Inventories are valued at the lower of cost or net realizable value. Costs are determined using standard cost, which approximates actual cost on a first-in, first-out basis. The Company assesses the valuation of inventory and periodically adjusts the value for estimated excess and obsolete inventory based upon estimates of future demand and market conditions, as well as damaged or otherwise impaired goods.

Inventories related to the Matterport Acquisition consisted of the following (in millions):


	March 31, 2026		December 31, 2025
Finished goods	$	8	$	4
Purchased parts and raw materials	6		2
Total inventories	$	14	$	6

Leases

The determination of whether an arrangement contains a lease and the classification of a lease, if applicable, is made at the commencement of the arrangement, at which time the Company also measures and recognizes a ROU asset, representing the Company’s right to use the underlying asset, and a lease liability, representing the Company’s obligation to make lease payments under the terms of the arrangement. For the purposes of recognizing ROU assets and lease liabilities associated with the Company’s leases, the Company has elected the practical expedient to not recognize a ROU asset or lease liability for short-term leases, which are leases with a term of 12 months or less. The lease term is defined as the noncancelable portion of the lease term, plus any periods covered by an option to extend the lease if it is reasonably certain that the option will be exercised.

In determining the amount of lease payments used in measuring ROU assets and lease liabilities, the Company has elected the practical expedient not to separate non-lease components from lease components for all classes of underlying assets. Consideration deemed part of the lease payments used to measure ROU assets and lease liabilities generally includes fixed payments and variable payments based on either an index or a rate, offset by lease incentives. Upon commencement, the initial ROU asset also includes any lease prepayments. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The rates implicit within the Company's leases are generally not determinable. Therefore, the Company's incremental borrowing rate is used to determine the present value of lease payments. The determination of the Company’s incremental borrowing rate requires judgment and is determined at lease commencement and is subsequently reassessed upon a modification to the lease arrangement.

Lease costs related to the Company's operating leases are generally recognized as a single ratable lease cost over the lease term.

See Note 6 for further discussion of the Company’s accounting for leases.

Long-Lived Assets, Intangible Assets, and Goodwill

Long-lived assets, such as property and equipment and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated

undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset exceeds its estimated undiscounted future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. The Company capitalizes interest costs during the construction phase. Capitalized interest is added to the cost of the underlying asset upon substantial completion and amortized over the estimated useful life of the asset.

Acquired technology and data, customer base assets, trade names, and other intangible assets are related to the Company’s acquisitions. The Company removes fully amortized intangible assets from the cost and accumulated amortization amounts disclosed.

Goodwill is tested for impairment at least annually, on October 1, or more frequently if an event or other circumstance indicates that the fair value of a reporting unit may be below its carrying amount. The Company may first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount or elect to bypass the qualitative assessment. If it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, or the Company elects to bypass the qualitative assessment, the Company then performs a quantitative assessment by determining the fair value of each reporting unit. The estimate of the fair value of each reporting unit is based on a projected discounted cash flow model that includes significant assumptions and estimates, including the discount rate, growth rate, and future financial performance. Assumptions about the discount rate are based on a weighted-average cost of capital for comparable companies. Assumptions about the growth rate and future financial performance of a reporting unit are based on the Company’s forecasts, business plans, economic projections, and anticipated future cash flows. The fair value of each reporting unit is compared to the carrying amount of the reporting unit. If the carrying value of the reporting unit exceeds the fair value, then an impairment loss is recognized for the difference.

Leasing Operations and Other Expense, Net

In February 2024, the Company closed on the purchase of an office tower and the land on which it rests in Arlington, Virginia. In January 2025, the Company relocated its headquarters from Washington, D.C. to Arlington, VA, initially occupying approximately 30% of the building. The Company continues to build out further space in this building to support anticipated growth and expansion of its operations in the coming years. Maintenance, physical facilities, leasing, property management, and other key responsibilities related to property ownership are outsourced to professional real-estate managers. The office tower measures approximately 550,000 rentable square feet.

The Company records the third-party rental activity from this building's operations and leases, including building depreciation and operating expenses for space occupied by tenants, as other expense, net in the condensed consolidated statements of operations.

Deferred lease income as of March 31, 2026 and December 31, 2025 was as follows (in millions):


Balance	Balance Sheet Caption	March 31, 2026		December 31, 2025
Current portion	Other current liabilities	$	6	$	6
Non-current portion	Lease and other long-term liabilities	34		35
Total deferred lease income		$	40	$	41

Lease income includes base rent each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease, which includes the effects of periodic step-ups in rent and rent abatements under the lease. When a renewal option is included within the lease, the Company assesses whether the option is reasonably certain of being exercised against relevant economic factors to determine whether the option period should be included as part of the lease term. Further, lease income includes tenant reimbursement amounts for the recovery of the operating expenses and real estate taxes. Tenant reimbursements, which vary each period, are non-lease components that are not the predominant activity within the contract. The Company has elected the practical expedient that allows it to combine certain lease and non-lease components of operating leases. Non-lease components are recognized together with fixed base rent in “lease income” as variable lease income in the same period as the related expenses are incurred. Variable lease income was not

material for the three months ended March 31, 2026 and March 31, 2025. Components of other expense, net related to leasing operations for the three months ended March 31, 2026 and 2025 were as follows (in millions):


	Three Months Ended March 31,
	2026		2025
Lease income(1)	$	4	$	5
Less:
Property operating expenses	1		1
Depreciation and amortization expense	3		4
Other expense from leasing operations	$	—	$	—
__________________________
(1) Includes $2 million and $1 million of amortization expense of above-market leases for the three months ended March 31, 2026 and 2025, respectively.

Building depreciation and operating expenses for space occupied by the Company are allocated among cost of revenue, selling and marketing (excluding customer base amortization), software development, and general and administrative expenses on the condensed consolidated statements of operations based on the headcount of the respective departments occupying the building. As of March 31, 2026, the Company occupied approximately 50% of the property with the remainder leased or available to be leased to third parties.

Debt Issuance Costs

Costs incurred in connection with the issuance of long-term debt are deferred and amortized as interest expense over the term of the related debt using the effective interest method for term debt and on a straight-line basis for revolving debt. The Company made a policy election to classify deferred issuance costs on the revolving credit facility as a long-term asset on its condensed consolidated balance sheets. Upon a refinancing or amendment, previously capitalized debt issuance costs are expensed and included in loss on extinguishment of debt if the Company determines that there has been a substantial modification of the related debt. If the Company determines that there has not been a substantial modification of the related debt, any previously capitalized debt issuance costs are amortized as interest expense over the term of the new debt instrument.

See Note 9 for further discussion of the Company's accounting for its outstanding debt, revolving credit facility, and related issuance costs.

Business Combinations

The Company includes the results of operations of the businesses that it acquires from the date of acquisition. The Company generally allocates the purchase consideration to the tangible assets acquired and liabilities assumed and intangible assets acquired based on their estimated fair values on the date of the acquisition. The purchase price is generally determined based on the fair value of the assets transferred, liabilities assumed, and equity interests issued, after considering any transactions that are separate from the business combination. The excess of the fair value of purchase consideration, the fair value of any NCI in the acquiree, and the fair value of any previous equity interest in the acquiree over the fair values of these identifiable assets and liabilities is recorded as goodwill. In a business combination achieved in stages, the Company shall remeasure its previously held equity interest in the acquiree at its acquisition-date fair value and recognize the resulting gain or loss, if any, in results of operations. The Company applies significant assumptions, estimates, and judgments in determining the fair value of assets acquired and liabilities assumed on the acquisition date, especially with respect to intangible assets and contingent liabilities. Significant estimates in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired customer bases, acquired technology, acquired trade names, useful lives, royalty rates, and discount rates. Estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. Any adjustments to provisional amounts that are identified during the measurement period, not to exceed one year from the date of acquisition, are recorded in the reporting period in which the adjustment amounts are determined. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings.

The Company has elected the practical expedient provided under ASC 805, Business Combinations, which allows for contract assets and liabilities acquired or assumed in an acquisition to be measured in accordance with the accounting framework for revenue from contracts with customers as if the Company had originated the acquired contract. This is an

exception to the general requirement to measure assets acquired and liabilities assumed at their fair value on the acquisition date.

For a given acquisition, the Company may identify certain pre-acquisition contingencies as of the acquisition date and may extend its review and evaluation of these pre-acquisition contingencies throughout the measurement period in order to obtain sufficient information to assess whether the Company includes these contingencies as part of the fair value estimates of assets acquired and liabilities assumed and, if so, to determine their estimated amounts.

If the Company cannot reasonably determine the fair value of a pre-acquisition contingency (non-income tax-related) by the end of the measurement period, which is generally the case given the nature of such matters, the Company will recognize an asset or a liability for such pre-acquisition contingency if: (i) it is probable that an asset existed or a liability had been assumed at the acquisition date and (ii) the amount of the asset or liability can be reasonably estimated. Subsequent to the measurement period, changes in the Company's estimates of such contingencies will affect earnings and could have a material effect on its results of operations and financial position.

In addition, uncertain tax positions and tax-related valuation allowances assumed in connection with a business combination are initially estimated as of the acquisition date. The Company reevaluates these items based upon facts and circumstances that existed as of the acquisition date with any adjustments to its preliminary estimates being recorded to goodwill, provided that the Company is within the measurement period. Subsequent to the measurement period, changes to these uncertain tax positions and tax-related valuation allowances will affect the Company's provision for income taxes in its condensed consolidated statements of operations and comprehensive income and could have a material impact on its results of operations and financial position.

Transaction costs associated with business combinations are expensed as incurred and are included in general and administrative expenses in the condensed consolidated statements of operations.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

The Company adopted ASU No. 2025-05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets effective January 1, 2026. This ASU provides a practical expedient for estimating expected credit losses on current accounts receivable and current contract assets arising from transactions accounted for under ASC 606. Under the expedient, entities may assume that current conditions as of the balance sheet date do not change for the remaining life of the asset when developing reasonable and supportable forecasts as part of estimating expected credit losses. The Company adopted the ASU effective January 1, 2026 on a prospective basis and elected the practical expedient for the calculation of current expected credit losses. The adoption did not result in a material impact on the Company's condensed consolidated financial statements and related disclosures.

Recent Accounting Pronouncements Not Yet Adopted

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The ASU requires incremental disclosures about specific expense categories, including but not limited to, purchases of inventory, employee compensation, depreciation, amortization, and selling expenses. The amendments are effective for fiscal years beginning after December 15, 2026 and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted and the amendments may be applied either prospectively or retrospectively. Management is currently evaluating this ASU to determine its impact on the Company's disclosures.

In May 2025, the FASB issued ASU No. 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity. The ASU revises current guidance for determining the accounting acquirer for a transaction effected primarily by exchanging equity interests in which the legal acquiree is a VIE that meets the definition of a business. The amendments differ from current GAAP because, for certain transactions, they replace the requirement that the primary beneficiary of a VIE is always the acquirer with an assessment that requires an entity to consider the factors to determine which entity is the accounting acquirer. Under the amendments, acquisition transactions in which the legal acquiree is a VIE will, in more instances, result in the same accounting outcomes as economically similar transactions in which the legal acquiree is a voting interest entity. The ASU does not change the accounting for a transaction determined to be a reverse acquisition or a transaction in which the legal acquirer is not a business

and is determined to be the accounting acquiree. The new guidance will become effective for interim and annual reporting periods beginning on January 1, 2027, will require a prospective transition method for business combinations that occur after the initial adoption date, and early adoption is permitted. Management is currently evaluating this ASU to determine its impact on the Company's disclosures.

In September 2025, the FASB issued ASU No. 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The ASU eliminates all references to prescriptive and sequential software project stages throughout Subtopic 350-40. An entity is required to begin capitalizing software costs when both of the following occur: (1) management has authorized and committed to funding the software project and (2) it is probable that the project will be completed and the software will be used to perform the function intended (referred to as the “probable-to-complete recognition threshold”). The ASU is effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may adopt the new guidance using a prospective transition approach, a modified transition approach that is based on the status of the project and whether software costs were capitalized before the date of adoption, or a retrospective transition approach. Early adoption is permitted as of the beginning of an annual reporting period. The Company is currently evaluating the impact this ASU will have on its consolidated financial statements and related disclosures.

GOODWILL

3 Months Ended

Mar. 31, 2026

Goodwill [Abstract]

GOODWILL

The changes in the carrying amount of goodwill by operating segment consist of the following (in millions):


	Commercial Real Estate		Residential Real Estate		Total
Goodwill, December 31, 2025	$	1,955	2,989		4,944
Acquisitions, including measurement period adjustments	$	—	$	(1)	(1)
Effect of foreign currency translation	$	4	$	28	32
Goodwill, March 31, 2026	$	1,959	3,017		4,975

The Company did not recognize any impairment losses on goodwill during the three months ended March 31, 2026 or 2025.

- Definition

The entire disclosure for goodwill.

+ References + Details

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Current portion	$ 6	$ 7
Non-current portion	3	3
Total contract assets	$ 9	$ 10

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3	$ (15)
Other comprehensive income, net of tax
Foreign currency translation adjustment	51	9
Total other comprehensive income	51	9
Total comprehensive income (loss)	$ 54	$ (6)

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 42	$ 30
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	6	4
Selling and marketing (excluding customer base amortization)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	5	5
Software development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	13	7
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 18	$ 14

INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2026

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

Intangible assets consist of the following (in millions, except amortization period data):


	March 31, 2026		December 31, 2025		Weighted- Average Amortization Period (in years)
Acquired technology and data	$	474	$	471	8
Accumulated amortization	(72)		(55)
Acquired technology and data, net	402		416

Acquired customer base	1,347		1,330		15
Accumulated amortization	(439)		(403)
Acquired customer base, net	908		927

Acquired trade names and other intangible assets	524		524		14
Accumulated amortization	(151)		(146)
Acquired trade names and other intangible assets, net	373		378

Acquired above-market leases	42		42		9
Accumulated amortization	(15)		(14)
Acquired above-market leases, net	27		28

Acquired in-place leases	31		31		9
Accumulated amortization	(10)		(9)
Acquired in-place leases, net	21		22

Intangible assets, net	$	1,731	$	1,771

EMPLOYEE BENEFIT PLANS - Restrictive Stock Award and Units Activity Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 42	$ 30
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	3 years
Performance service period (in years)	3 years
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights (as a percent)	80.00%
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights (as a percent)	120.00%
Restricted Stock Awards — with Market Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6	$ 1
Expected annual compensation	$ 19
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	3 years
Performance service period (in years)	3 years
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights (as a percent)	50.00%
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights (as a percent)	250.00%
Performance-Based RSUs - With Market And Performance Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected annual compensation	$ 19

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Inventories Related to the Matterport Acquisition (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounting Policies [Abstract]
Finished goods	$ 8	$ 4
Purchased parts and raw materials	6	2
Total inventories	$ 14	$ 6

LONG-TERM DEBT - Narrative (Details)			3 Months Ended
LONG-TERM DEBT - Narrative (Details)	May 24, 2024 USD ($)	Jul. 01, 2020	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
2.800% Senior Notes due July 15, 2030
Debt Instrument [Line Items]
2.800% Senior Notes due July 15, 2030			$ 1,000,000,000	$ 1,000,000,000
Stated interest rate (as a percent)		2.80%	2.80%
Discounted rate par value (as a percent)		99.921%
Redemption price rate (as a percent)		100.00%
Credit Agreement 2024 \| Revolving Loans and Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,100,000,000
Term of credit facility (in years)	5 years
Total leverage ratio			4.50
Line of credit facility, amount outstanding			$ 0
Credit Agreement 2024 \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 20,000,000
Credit Agreement 2024 \| Letter of Credit \| Minimum \| Alternate Base Rate
Debt Instrument [Line Items]
Basis spread	0.125%
Credit Agreement 2024 \| Letter of Credit \| Minimum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread	1.125%
Credit Agreement 2024 \| Letter of Credit \| Maximum \| Alternate Base Rate
Debt Instrument [Line Items]
Basis spread	0.75%
Credit Agreement 2024 \| Letter of Credit \| Maximum \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread	1.75%
2020 Credit Agreement \| Other Assets
Debt Instrument [Line Items]
Capitalized debt issuance costs			$ 3,000,000	$ 3,000,000

EMPLOYEE BENEFIT PLANS - Stock Incentive Plans Narrative (Details) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized in future years \| $	$ 299.0
Weighted-average-period expected to recognize the unrecognized compensation cost (in years)	3 years
Matterport
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	4 years
Minimum \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	1 year
CoStar Group, Inc. 2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for issuance under the plan (in shares) \| shares	13.2
Shares available for future grant under the plan (in shares) \| shares	7.8
CoStar Group, Inc. 2016 Stock Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	3 years
CoStar Group, Inc. 2016 Stock Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options and restricted stock grants (in years)	4 years
CoStar Group, Inc. 2021 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program, remaining authorized, amount \| $	$ 2.1

REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 897	$ 732
Revenue, remaining performance obligation	$ 519
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	5 years
Non-US
Disaggregation of Revenue [Line Items]
Revenue	$ 137	$ 48

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

SEGMENT REPORTING - Summarized EBITDA Information by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenue	$ 897	$ 732
Personnel	410	342
Marketing	227	216
General and administrative	179	175
EBITDA	81	(1)
Stock-based compensation expense	42	30
Acquisition and integration related costs	7	22
Restructuring and related costs	2	7
Settlements and impairments	0	8
Adjusted EBITDA	132	66
Operating Segments
Segment Reporting Information [Line Items]
EBITDA	81	(1)
Acquisition and integration related costs
Restructuring and related costs
Settlements and impairments
Adjusted EBITDA
Operating Segments \| Commercial Real Estate
Segment Reporting Information [Line Items]
Revenue	472	409
Personnel	232	190
Marketing	18	17
General and administrative	95	99
EBITDA	127	103
Stock-based compensation expense	29	22
Acquisition and integration related costs	4	20
Restructuring and related costs	1	5
Settlements and impairments	0	1
Adjusted EBITDA	161	151
Operating Segments \| Residential Real Estate
Segment Reporting Information [Line Items]
Revenue	425	323
Personnel	178	152
Marketing	209	199
General and administrative	84	76
EBITDA	(46)	(104)
Stock-based compensation expense	13	8
Acquisition and integration related costs	3	2
Restructuring and related costs	1	2
Settlements and impairments	0	7
Adjusted EBITDA	$ (29)	$ (85)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounting Policies [Abstract]
Cash and cash equivalents	$ 1,215	$ 1,633
Restricted cash	101	100
Total cash, cash equivalents, and restricted cash	$ 1,316	$ 1,733	$ 3,778	$ 4,681

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 1,215	$ 1,633
Restricted cash	101	100
Accounts receivable	301	263
Less: Allowance for credit losses	(32)	(29)
Accounts receivable, net	269	234
Income taxes receivable	18	18
Prepaid expenses and other current assets	103	134
Total current assets	1,706	2,119
Deferred income taxes, net	44	47
Property and equipment, net	1,367	1,323
Lease right-of-use assets	120	123
Goodwill	4,975	4,944
Intangible assets, net	1,731	1,771
Deferred commission costs, net	188	184
Deposits and other assets	33	27
Total assets	10,164	10,538
Current liabilities:
Accounts payable	39	42
Accrued wages and commissions	126	145
Accrued expenses	216	203
Litigation accrual	99	99
Income taxes payable	1	1
Lease liabilities	28	28
Current portion	237	205
Other current liabilities	31	23
Total current liabilities	777	746
Long-term debt, net	994	993
Deferred income taxes, net	244	238
Income taxes payable	30	27
Lease and other long-term liabilities	168	163
Total liabilities	2,213	2,167
Stockholders' equity attributable to CoStar Group	7,913	8,334
Equity attributable to NCI	38	37
Total equity	7,951	8,371
Total liabilities and stockholders' equity	$ 10,164	$ 10,538

LEASES - Narrative (Details)	Mar. 31, 2026
Leases [Abstract]
Term of contract (in years)	9 years

GOODWILL - Goodwill by Segment (Details) $ in Millions	3 Months Ended
GOODWILL - Goodwill by Segment (Details) $ in Millions	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 4,944
Acquisitions, including measurement period adjustments	(1)
Effect of foreign currency translation	32
Goodwill, ending balance	4,975
Commercial Real Estate
Goodwill [Roll Forward]
Goodwill, beginning balance	1,955
Acquisitions, including measurement period adjustments	0
Effect of foreign currency translation	4
Goodwill, ending balance	1,959
Residential Real Estate
Goodwill [Roll Forward]
Goodwill, beginning balance	2,989
Acquisitions, including measurement period adjustments	(1)
Effect of foreign currency translation	28
Goodwill, ending balance	$ 3,017

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
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-Name Accounting Standards Codification
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-Paragraph 8
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
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-URI https://asc.fasb.org/1943274/2147479303/805-10-55-41

Reference 4: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
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-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478064/805-740-55-13

Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-URI https://asc.fasb.org/1943274/2147479303/805-10-55-39

Reference 6: http://www.xbrl.org/2003/role/exampleRef
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-Section 55
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 7: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
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-Paragraph 100
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 8: http://www.xbrl.org/2003/role/exampleRef
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-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(15))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482598/350-20-45-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-4

+ Details

SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Summarized Information by Operating Segment

Summarized EBITDA and Adjusted EBITDA information by operating segment consists of the following (in millions):


	Three Months Ended March 31,
	2026						2025
	Commercial Real Estate		Residential Real Estate		Total		Commercial Real Estate		Residential Real Estate		Total
Revenue(1)	$	472	$	425	$	897	$	409	$	323	$	732
Less:
Personnel	232		178		410		190		152		342
Marketing	18		209		227		17		199		216
General and administrative(2)	95		84		179		99		76		175
EBITDA	$	127	$	(46)	$	81	$	103	$	(104)	$	(1)
Stock-based compensation expense	29		13		42		22		8		30
Acquisition and integration related costs	4		3		7		20		2		22
Restructuring and related costs	1		1		2		5		2		7
Settlements and impairments	—		—		—		1		7		8
Adjusted EBITDA	$	161	$	(29)	$	132	$	151	$	(85)	$	66
__________________________
(1) See Note 3 for details of revenue disaggregated by segment.
(2) Excludes personnel costs.

The following summarizes stock-based compensation, which is a significant non-cash item included in the personnel costs above, by segment (in millions):


	Three Months Ended March 31,
	2026		2025
Commercial Real Estate	$	29	$	22
Residential Real Estate	13		8
Total	$	42	$	30

Schedule of Reconciliation of Net (Loss) Income to EBITDA

The reconciliation of Adjusted EBITDA and EBITDA to income (loss) before income taxes consists of the following (in millions):


	Three Months Ended March 31,
	2026		2025
Adjusted EBITDA	$	132	$	66
Stock-based compensation expense	(42)		(30)
Acquisition and integration related costs	(7)		(22)
Restructuring and related costs	(2)		(7)
Settlements and impairments	—		(8)
EBITDA	$	81	$	(1)
Amortization of acquired intangible assets in cost of revenue	(27)		(11)
Amortization of acquired intangible assets in operating expenses	(37)		(17)
Depreciation and other amortization	(14)		(14)
Interest income, net	10		38
Other expense, net(1)	(1)		(2)
Income (loss) before income taxes	$	12	$	(7)
__________________________
(1) Includes $5 million of depreciation and amortization expense including above-market lease amortization associated with lessor activities for the three months ended March 31, 2026 and 2025.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Anti-dilutive Shares (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	4.1	2.2
Performance-based restricted stock awards and units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	1.8	1.4

EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2026

Schedule of Option Activity

Option activity was as follows:


	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contract Life (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2025	3,203,725	$	38.32	4	$	102
Granted	—	$	—
Exercised	(887,901)	$	9.34		$	50
Canceled or expired	—	$	—
Outstanding at March 31, 2026	2,315,824	$	49.43	4	$	16
Exercisable at March 31, 2026	2,123,056	$	46.71	4	$	16

Schedule of Fair Value Assumption for Options Granted

The Company uses the Black-Scholes option pricing model to estimate the fair value of the option awards. The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded for the three months ended March 31, 2025:


	Three Months Ended March 31, 2025
Dividend yield	0		%
Expected volatility	35		%
Risk-free interest rate	4.29		%
Expected life (in years)	5
Weighted-average grant date fair value	$	30.05

The assumptions used to estimate the fair value of performance-based restricted stock awards with market conditions granted in the three months ended March 31, 2025 were as follows:


	Three Months Ended March 31, 2025
Dividend yield	0		%
Expected volatility	31		%
Risk-free interest rate	4.23		%
Expected life (in years)	3
Weighted-average grant date fair value	$	85.29

The assumptions used to estimate the fair value of performance-based restricted stock units with market conditions were as follows:


	Three Months Ended March 31, 2026
Dividend yield	0		%
Expected volatility	33		%
Risk-free interest rate	3.36		%
Expected life (in years)	3
Weighted-average grant date fair value	$	30.19

Schedule of Unvested Restricted Stock Awards Activity

The following table presents unvested restricted stock awards activity for the three months ended March 31, 2026:


	Restricted Stock Awards — without Market Condition			Restricted Stock Awards — with Market Condition
	Number of Shares	Weighted-Average Grant Date Fair Value per Share		Number of Shares	Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock awards at December 31, 2025	3,643,210	$	78.32	996,000	$	84.93
Granted	1,246	$	57.15	—	$	—
Vested	(981,553)	$	75.22	(69,364)	$	81.58
Canceled	(42,654)	$	77.57	(170,876)	$	81.58
Unvested restricted stock awards at March 31, 2026	2,620,249	$	79.58	755,760	$	86.00

The following table presents unvested restricted stock units activity for the three months ended March 31, 2026:


	Restricted Stock Units — without Market Condition			Restricted Stock Units — with Market Condition
	Number of Units	Weighted-Average Grant Date Fair Value per Share		Number of Units	Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock units at December 31, 2025	714,920	$	76.09	—	$	—
Granted	1,653,872	$	48.14	642,603	$	41.02
Vested	(97,035)	$	75.33	—	$	—
Canceled	(61,787)	$	72.82	—	$	—
Unvested restricted stock units at March 31, 2026	2,209,970	$	55.30	642,603	$	41.02

LONG-TERM DEBT - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Debt Disclosure [Abstract]
Interest on outstanding borrowings	$ 7	$ 7
Amortization of Senior Notes discount and issuance costs	1	1
Interest capitalized for construction in process	(5)	(3)
Commitment fees and other	1	1
Total interest expense	$ 4	$ 6

ACQUISITIONS - Purchase Consideration Domain Acquisition (Details) - Domain $ in Millions, $ in Millions		1 Months Ended
	Aug. 27, 2025 USD ($)	Aug. 31, 2025 USD ($)	Aug. 31, 2025 AUD ($)
Business Combination [Line Items]
Cash	$ 1,472
Settlement of existing debt	139
Fair value of cash settled equity awards related to pre-combination services	1
Total	1,612	$ 1,600	$ 2,500
Fair value of previously held equity interests	300	$ 300	$ 465
Equity interest in acquiree, total	$ 1,912

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenue	$ 897	$ 732
Cost of revenue	196	153
Gross profit	701	579
Operating expenses:
Selling and marketing (excluding customer base amortization)	421	369
Software development	114	95
General and administrative	126	141
Customer base amortization	37	17
Total operating expenses	698	622
Income (loss) from operations	3	(43)
Interest income, net	10	38
Other expense, net	(1)	(2)
Income (loss) before income taxes	12	(7)
Income tax expense	9	8
Net income (loss)	$ 3	$ (15)
Earnings per share - basic - (in dollars per share)	$ 0.01	$ (0.04)
Earnings per share - diluted (in dollars per share)	$ 0.01	$ (0.04)
Weighted-average outstanding shares - basic (in shares)	413.0	410.5
Weighted-average outstanding shares - diluted (in shares)	414.0	410.5

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

The following summarizes the Company's significant contractual obligations, including related payments due by period, as of March 31, 2026 (in millions):


Year Ending December 31,	Operating lease obligations		Finance lease obligations		Long-term debt principal payments		Long-term debt interest payments
Remainder of 2026	$	20	$	4	$	—	$	14
2027	35		5		—		28
2028	34		1		—		28
2029	26		—		—		28
2030	20		—		1,000		28
Thereafter	23		—		—		—
Total	$	158	$	10	$	1,000	$	126

As of March 31, 2026, we have excluded from the table above additional operating leases that had not yet commenced with aggregate rent payments of $37 million. These operating leases will commence in the remainder of 2026 with lease terms of five to six years.

The Company leases office facilities under various non-cancelable operating leases, as well as data centers and vehicles under finance lease arrangements. The leases contain various renewal options.

See Note 6 for further discussion of the Company's lease commitments.

Litigation

Currently, and from time to time, the Company is involved in litigation incidental to the conduct of its business. The Company records a provision for a liability when it is both probable that a liability has been incurred and the amount can be reasonably estimated. While it is reasonably possible that an unfavorable outcome may occur as a result of one or more of the Company’s current litigation matters, at this time, management has concluded that the resolutions of these matters are not expected to have a material effect on the Company's condensed consolidated financial position, future results of operations, or liquidity. Legal defense costs are expensed as incurred, except as set forth below.

Matterport-Related Matters

On July 23, 2021, plaintiff William J. Brown, a former employee and a stockholder of Matterport, sued Matterport, Gores Holdings VI, Inc. (now known as Matterport, Inc.), Maker Merger Sub Inc., Maker Merger Sub II, LLC, and Matterport directors R.J. Pittman, David Gausebeck, Matt Bell, Peter Hebert, Jason Krikorian, Carlos Kokron, and Michael Gustafson (collectively, the “Brown Defendants”) in the Court of Chancery of the State of Delaware (the “Chancery Court”). Brown claimed that the Brown Defendants imposed invalid transfer restrictions on his shares of Matterport stock in connection with the Gores Merger transactions (the "Gores Transaction" and the Agreement and the Plan of Merger thereunder, the "Gores Merger Agreement") between Matterport, Inc. and Legacy Matterport (the “Transfer Restrictions”), and that Matterport’s board of directors violated their fiduciary duties in connection with a purportedly misleading letter of transmittal. An expedited trial regarding the facial validity of the Transfer Restrictions took place in December 2021. On January 11, 2022, the court issued a ruling that the Transfer Restrictions did not apply to Brown. Separate proceedings regarding Brown's remaining claims, including the amount of any damages suffered by Brown were the subject of the second phase of the case. Legacy Matterport's position was that Brown did not suffer any damages as he would have sold his shares as soon as possible after the Gores

Transaction closed had Legacy Matterport not prevented him from trading based on its application of the Transfer Restrictions. Trial was held in November 2023, and a post-trial hearing was held on February 22, 2024. On May 28, 2024, the court ruled that Matterport had a reasonable basis to deny the plaintiff’s November 2021 demand that the transfer restrictions be removed from his shares and that the plaintiff lacked standing as to whether the transfer restrictions complied with Delaware law. However, the court awarded Brown $79 million plus pre- and post-judgment interest as damages for losses caused by Matterport’s initial refusal to issue freely transferable shares (the “Brown Judgment”). On July 29, 2024, a notice of appeal to the court's ruling to the Delaware Supreme Court was filed. Brown filed a notice of cross-appeal on August 12, 2024. Oral argument on the appeal was heard on February 26, 2025. On April 22, 2025, the Delaware Supreme Court substantially affirmed the Chancery Court's $79 million damages award but reversed and remanded for additional proceedings on the manner in which post-judgment interest was calculated.

The Company has estimated a litigation accrual of $99 million as of March 31, 2026, considering the substantially-affirmed damages award and the Company's estimate of the expected interest award using the Chancery Court's previously determined interest methodology. This estimated litigation accrual is subject to change based on the Chancery Court's revised ruling. The Company anticipates the revised ruling will occur by the first half of 2026. The Company estimated additional interest of up to approximately $17 million could be awarded if the Chancery Court followed the methodology Brown previously argued and which was rejected. Subsequent to the Brown Judgment, on August 14, 2024, a litigation bond was posted, and Matterport transferred $95 million in cash as collateral into a designated insured interest-bearing account, which is classified as restricted cash on the Company’s condensed consolidated balance sheet as of March 31, 2026.

Since the Brown judgment in May 2024, other former Legacy Matterport stockholders have filed complaints (the “Post-Brown Complaints”) in the Chancery Court alleging that they were prevented from trading their Matterport shares through invalid transfer restrictions. These complaints were filed as follows: on July 19, 2024 by Damien Leostic and William Schmitt; on August 16, 2024 by Greg Coombe; on September 19, 2024 by Build Legacy LLC, Build the Future Trust under agreement dated November 16, 2023, Penchant Capital LLC, Penchant Trust, and iRobot Corporation. On September 16, 2024, Kimberly Burdi-Dumas, a former Matterport employee, filed a putative class action complaint on behalf of all persons or entities who were stockholders of Legacy Matterport as of July 21, 2021, and who, pursuant to the Gores Transaction, were thereafter issued and held Matterport shares that were improperly restricted from being sold until January 18, 2022. On November 26, 2024, Schmitt amended his complaint to bring a class action on behalf of former members of Matterport who did not receive their shares immediately following the closing of Gores Transaction. On December 6, 2024, the Burdi-Dumas complaint was amended to include a second plaintiff, Janet Day, and additional claims. These cases have now been consolidated and coordinated.

The Company monitors developments in these legal matters that could affect the estimate the Company may have previously accrued. As of March 31, 2026, there were no amounts accrued that the Company believes would be material to its financial position, except as noted above. Further, the range of reasonably possible losses in excess of accrued liabilities currently cannot be reasonably estimated, except as noted above.

ACQUISITIONS - Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Aug. 27, 2025	Feb. 28, 2025
Business Combination [Line Items]
Goodwill	$ 4,975	$ 4,944
Domain
Business Combination [Line Items]
Cash and cash equivalents			$ 15
Accounts receivable			35
Intangible assets			931
Accrued expenses			(27)
Deferred revenue			(14)
Deferred tax liability			(231)
Other assets and (liabilities), net			(2)
Fair value of identifiable net assets acquired			707
Fair value of NCI in Domain’s partially-owned subsidiaries			(39)
Goodwill			1,244
Recognized asset acquired to liability assumed, excess (less), and goodwill			$ 1,912
Matterport
Business Combination [Line Items]
Cash and cash equivalents				$ 55
Restricted cash				97
Accounts receivable				13
Available for sale investments				204
Deferred tax assets, net of valuation allowance				69
Intangible assets				527
Deferred revenue				(32)
Litigation accrual	$ (99)			(99)
Other assets and (liabilities), net				(12)
Fair value of identifiable net assets acquired				1,927
Goodwill				$ 1,105

COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Schedule of Lessee, Operating Lease, Liability, Maturity

The following summarizes the Company's significant contractual obligations, including related payments due by period, as of March 31, 2026 (in millions):


Year Ending December 31,	Operating lease obligations		Finance lease obligations		Long-term debt principal payments		Long-term debt interest payments
Remainder of 2026	$	20	$	4	$	—	$	14
2027	35		5		—		28
2028	34		1		—		28
2029	26		—		—		28
2030	20		—		1,000		28
Thereafter	23		—		—		—
Total	$	158	$	10	$	1,000	$	126

Schedule of Maturities of Long-term Debt

The following summarizes the Company's significant contractual obligations, including related payments due by period, as of March 31, 2026 (in millions):


Year Ending December 31,	Operating lease obligations		Finance lease obligations		Long-term debt principal payments		Long-term debt interest payments
Remainder of 2026	$	20	$	4	$	—	$	14
2027	35		5		—		28
2028	34		1		—		28
2029	26		—		—		28
2030	20		—		1,000		28
Thereafter	23		—		—		—
Total	$	158	$	10	$	1,000	$	126

REVENUE FROM CONTRACTS WITH CUSTOMERS - Deferred Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Current portion	$ 237	$ 205
Non-current portion	1	1
Total deferred revenue	$ 238	$ 206

EMPLOYEE BENEFIT PLANS - Restrictive Stock Award Activity (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Restricted Stock Units — with Market Condition
Number of Shares
Unvested restricted stock at beginning of period (in shares) \| shares	714,920
Granted (in shares) \| shares	1,653,872
Vested (in shares) \| shares	(97,035)
Canceled (in shares) \| shares	(61,787)
Unvested restricted stock at end of period (in shares) \| shares	2,209,970
Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock at beginning of period (in dollars per share) \| $ / shares	$ 76.09
Granted (in dollars per share) \| $ / shares	48.14
Vested (in dollars per share) \| $ / shares	75.33
Canceled (in dollars per share) \| $ / shares	72.82
Unvested restricted stock at end of period (in dollars per share) \| $ / shares	$ 55.30
Restricted Stock Units — with Market Condition
Number of Shares
Unvested restricted stock at beginning of period (in shares) \| shares	0
Granted (in shares) \| shares	642,603
Vested (in shares) \| shares	0
Canceled (in shares) \| shares	0
Unvested restricted stock at end of period (in shares) \| shares	642,603
Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock at beginning of period (in dollars per share) \| $ / shares	$ 0
Granted (in dollars per share) \| $ / shares	41.02
Vested (in dollars per share) \| $ / shares	0
Canceled (in dollars per share) \| $ / shares	0
Unvested restricted stock at end of period (in dollars per share) \| $ / shares	$ 41.02
Restricted Stock Awards — without Market Condition
Number of Shares
Unvested restricted stock at beginning of period (in shares) \| shares	3,643,210
Granted (in shares) \| shares	1,246
Vested (in shares) \| shares	(981,553)
Canceled (in shares) \| shares	(42,654)
Unvested restricted stock at end of period (in shares) \| shares	2,620,249
Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock at beginning of period (in dollars per share) \| $ / shares	$ 78.32
Granted (in dollars per share) \| $ / shares	57.15
Vested (in dollars per share) \| $ / shares	75.22
Canceled (in dollars per share) \| $ / shares	77.57
Unvested restricted stock at end of period (in dollars per share) \| $ / shares	$ 79.58
Performance-Based RSAs - With Market And Performance Condition [Member]
Number of Shares
Unvested restricted stock at beginning of period (in shares) \| shares	996,000
Granted (in shares) \| shares	0
Vested (in shares) \| shares	(69,364)
Canceled (in shares) \| shares	(170,876)
Unvested restricted stock at end of period (in shares) \| shares	755,760
Weighted-Average Grant Date Fair Value per Share
Unvested restricted stock at beginning of period (in dollars per share) \| $ / shares	$ 84.93
Granted (in dollars per share) \| $ / shares	0
Vested (in dollars per share) \| $ / shares	81.58
Canceled (in dollars per share) \| $ / shares	81.58
Unvested restricted stock at end of period (in dollars per share) \| $ / shares	$ 86.00