CoStar Group 10-Q 2026-03-31

Filed 2026-04-29. 8 sections, 226K characters. Original on sec.gov · Markdown · JSON

Cover and table of contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2026

OR

☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ______ to ______

Commission file number 0-24531

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CoStar Group, Inc.

(Exact name of registrant as specified in its charter)

Delaware52-2091509
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.)
1201 Wilson Blvd
ArlingtonVA22209

(Ad**dress of principal executive offices) (Zip Code)

(202) 346-6500

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered
Common Stock ($0.01 par value)CSGPNasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filerxAccelerated filer☐
Non-accelerated filer☐Smaller reporting company☐
Emerging growth company☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No x

As of April 27, 2026, there were 408,355,715 shares of the registrant’s common stock outstanding.

COSTAR GROUP, INC.

FORM 10-Q

TABLE OF CONTENTS

Glossary of Terms3
PART IFINANCIAL INFORMATION
Item 1.Financial Statements6
Condensed Consolidated Statements of Operations6
Condensed Consolidated Statements of Comprehensive Income (Loss)7
Condensed Consolidated Balance Sheets8
Condensed Consolidated Statements of Changes in Stockholders’ Equity9
Condensed Consolidated Statements of Cash Flows11
Notes to Condensed Consolidated Financial Statements12
Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations40
Item 3.Quantitative and Qualitative Disclosures About Market Risk54
Item 4.Controls and Procedures55
PART IIOTHER INFORMATION
Item 1.Legal Proceedings56
Item 1A.Risk Factors56
Item 2.Unregistered Sales of Equity Securities and Use of Proceeds56
Item 3.Defaults Upon Senior Securities56
Item 4.Mine Safety Disclosures56
Item 5.Other Information56
Item 6.Exhibits57
Signatures58

Glossary of Terms

The following abbreviations or acronyms used in this Quarterly Report on Form 10-Q (this “Report”) are defined below:

Abbreviation or AcronymDefinition
2020 Credit AgreementThe second amended and restated credit agreement, dated July 1, 2020, which amended and restated in its entirety the then-existing credit agreement originally entered into on April 1, 2014, as amended by the first amendment to the second amended and restated credit agreement, dated May 8, 2023, and was replaced by the 2024 Credit Agreement in May 2024
2024 Credit AgreementThe credit agreement the Company entered into on May 24, 2024, which replaced the 2020 Credit Agreement
2025 Form 10-KCoStar Group's Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on February 26, 2026
2026 ASR AgreementAccelerated Share Repurchase Program entered in 2026
A$Australian dollars
AIArtificial intelligence
AI TechnologiesAI and machine learning technologies
AOMsStructured equity vehicles operating under Domain's Agent Ownership Model. The AOMs function as strategic partnership tools that provide residential and commercial real estate agencies an economic stake in Domain-affiliated entities, creating a mechanism to reward long-term engagement and performance through profit-sharing rather than traditional commissions or rebates.
ASCAccounting Standards Codification
Assumed Matterport PlansThe Matterport, Inc. 2021 Incentive Award Plan and Matterport, Inc. Amended and Restated 2011 Stock Incentive Plan assumed by CoStar Group in connection with the Matterport Acquisition
ASUAccounting Standards Update
BEATBase erosion and anti-abuse minimum tax
Board of DirectorsThe CoStar Group Board of Directors
CODMChief Operating Decision Maker
CoStar Group (also the “Company,” “we,” “us,” or “our”)The legal entity, CoStar Group, Inc., a Delaware corporation, one or more of its consolidated subsidiaries or operating segments, or the entirety of CoStar Group, Inc. and its consolidated subsidiaries
CoStar Group ShareA share of the common stock of the Company, par value $0.01 per share
CRIThe legal entity CoStar Realty Information, Inc., a Delaware corporation and wholly owned subsidiary (and primary operating entity in the United States) of CoStar Group, Inc.
DomainDomain Holdings Australia Pty Limited
Domain AcquisitionCoStar's acquisition of Domain completed on August 27, 2025, pursuant to the Scheme Implementation Deed
Domain ProposalThe Company’s non-binding indicative proposal to acquire 100% of the issued capital of Domain by way of scheme of arrangement for a cash consideration of A$4.43 per ordinary share of Domain
DSUsDeferred Stock Units
EBITDANet income (loss) before interest income or expense, net; other income or expense, net; loss on debt extinguishment; income taxes; depreciation; and amortization
EPSEarnings Per Share
ESPPEmployee Stock Purchase Plan
EURIBOREuro Interbank Offered Rate
Exchange ActThe Securities Exchange Act of 1934, as amended
FASBFinancial Accounting Standards Board
FDIIForeign Derived Intangible Income
Abbreviation or AcronymDefinition
GAAPGenerally accepted accounting principles in the U.S.
GILTIGlobal intangible low-taxed income inclusion
Homes.comOne of the flagship brands of our residential products and a homes for-sale listings site, which manages workflow and marketing for residential real estate agents and brokers and allows homebuyers to view residential property listings, research communities, and connect with real estate agents and brokers
H.R.1A bill to provide for reconciliation pursuant to Title II of H. Con. Res. 14, commonly referred to as the One Big Beautiful Bill Act, and signed into law on July 4, 2025
Matching RSUsAwards of matching restricted stock units awarded under the Company's Management Stock Purchase Plan
MatterportThe legal entity Matterport, LLC, formerly known as Matterport Inc., a Delaware corporation and provider of a technology platform that uses spatial data to transform physical buildings and spaces into dimensionally accurate, digital images
Matterport AcquisitionCoStar's acquisition of Matterport completed on February 28, 2025, pursuant to the Matterport Merger Agreement
Matterport Common StockMatterport Class A common stock, par value $0.0001 per share
Matterport Merger AgreementOn April 21, 2024, CoStar Group entered into an Agreement and Plan of Merger and Reorganization with Matterport, Matrix Merger Sub I LLC, and Matrix Merger Sub II LLC
Matterport Merger Exchange RatioA ratio of 0.03552 which was determined by the Matterport Merger Agreement and was set on the collar floor as the volume-weighted average price at which the CoStar Group Shares traded on the Nasdaq Global Select Market for the 20 consecutive Trading Days was below the Floor Price of a symmetrical collar of $77.42
MLSsMultiple listing services
MSPPManagement Stock Purchase Plan
NCINoncontrolling interest
OnTheMarketThe legal entity OnTheMarket Limited, the operator of onthemarket.com, a U.K. residential property portal
Prior Stock Repurchase ProgramThe stock repurchase program the Board of Directors approved in February 2025 that authorizes the repurchase of up to $500 million CoStar Group Shares
ROURight-of-use
SaaSSoftware as a Service
SECThe U.S. Securities and Exchange Commission
Securities ActThe Securities Act of 1933, as amended
Senior Notes2.800% notes issued by CoStar Group, Inc. due July 15, 2030
SOFRSecured Overnight Financing Rate
SONIASterling Overnight Index Average
Stock Repurchase ProgramThe stock repurchase program the Board of Directors approved in December 2025 that authorizes the repurchase of up to $1.5 billion CoStar Group Shares
STRThe Company's brand for benchmarking hotel performance and providing market insights to the industry
Term SOFRThe forward-looking SOFR term rates administered by CME Group Benchmark Administration Limited
TSRTotal shareholder return
U.K.The United Kingdom of Great Britain and Northern Ireland
U.S.The United States of America
VIEVariable Interest Entity
Visual LeaseThe legal entity Visual Lease, LLC, a Delaware limited liability company and operator of Visual Lease, a SaaS platform for integrated lease management and lease accounting
Abbreviation or AcronymDefinition
Visual Lease AcquisitionCoStar's acquisition of all of the outstanding equity interest in Visual Lease completed on November 1, 2024, pursuant to the Visual Lease Merger Agreement
Visual Lease Merger AgreementThe Agreement and Plan of Merger dated as of October 18, 2024, between CRI; Neptune Merger Sub; Visual Lease, LLC; and Shareholder Representative Services LLC as the Holder Representative, pursuant to which, among other things, and subject to its terms, Neptune Merger Sub merged with and into Visual Lease with Visual Lease surviving the merger as a wholly owned subsidiary of CRI

PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

COSTAR GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in millions, except per share data)

(unaudited)

Three Months Ended March 31,
20262025
Revenue$897$732
Cost of revenue196153
Gross profit701579
Operating expenses:
Selling and marketing (excluding customer base amortization)421369
Software development11495
General and administrative126141
Customer base amortization3717
698622
Income (loss) from operations3(43)
Interest income, net1038
Other expense, net(1)(2)
Income (loss) before income taxes12(7)
Income tax expense98
Net income (loss)$3$(15)
Earnings per share - basic$0.01$(0.04)
Earnings per share - diluted$0.01$(0.04)
Weighted-average outstanding shares - basic413.0410.5
Weighted-average outstanding shares - diluted414.0410.5

See accompanying notes.

COSTAR GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in millions)

(unaudited)

Three Months Ended March 31,
20262025
Net income (loss)$3$(15)
Other comprehensive income, net of tax
Foreign currency translation adjustment519
Total other comprehensive income519
Total comprehensive income (loss)$54$(6)

See accompanying notes.

COSTAR GROUP, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in millions)

(unaudited)

March 31, 2026December 31, 2025
ASSETS
Current assets:
Cash and cash equivalents$1,215$1,633
Restricted cash101100
Accounts receivable301263
Less: Allowance for credit losses(32)(29)
Accounts receivable, net269234
Income taxes receivable1818
Prepaid expenses and other current assets103134
Total current assets1,7062,119
Deferred income taxes, net4447
Property and equipment, net1,3671,323
Lease right-of-use assets120123
Goodwill4,9754,944
Intangible assets, net1,7311,771
Deferred commission costs, net188184
Deposits and other assets3327
Total assets$10,164$10,538
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable$39$42
Accrued wages and commissions126145
Accrued expenses216203
Litigation accrual9999
Income taxes payable11
Lease liabilities2828
Deferred revenue237205
Other current liabilities3123
Total current liabilities777746
Long-term debt, net994993
Deferred income taxes, net244238
Income taxes payable3027
Lease and other long-term liabilities168163
Total liabilities2,2132,167
Stockholders' equity attributable to CoStar Group7,9138,334
Equity attributable to NCI3837
Total equity7,9518,371
Total liabilities and stockholders' equity$10,164$10,538
See accompanying notes.

COSTAR GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(in millions)

(unaudited)

Common StockAdditional Paid-In CapitalTreasury StockAccumulated Other Comprehensive IncomeRetained EarningsStockholders’ Equity Attributable to CoStar GroupEquity Attributable to NCITotal Equity
SharesAmount
Balance at December 31, 2025417.9$4$6,410$(510)$80$2,350$8,334$37$8,371
Net income—————33—3
Other comprehensive income————51—51—51
Change in NCI———————11
Exercise of stock options0.9—8———8—8
Restricted stock grants vested0.1——

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following Management’s Discussion and Analysis of Financial Condition and Results of Operations contains “forward-looking statements,” including statements about our beliefs and expectations. There are many risks and uncertainties that could cause actual results to differ materially from those discussed in the forward-looking statements. Potential factors that could cause actual results to differ materially from those discussed in any forward-looking statements include, but are not limited to, those stated under the heading “Cautionary Statement Concerning Forward-Looking Statements” at the end of this Item 2, “Risk Factors” in Item 1A of Part I of our 2025 Form 10-K, as well as those described from time to time in our filings with the SEC.

All forward-looking statements are based on information available to us on the date of this filing, and we assume no obligation to update such statements, whether as a result of new information, future events or otherwise, except as required by applicable law. The following discussion should be read in conjunction with our 2025 Form 10-K, our subsequent Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, other filings with the SEC, and the condensed consolidated financial statements and related notes included in this Report.

Overview

CoStar Group is a leading provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets, based on the numbers of unique visitors and site visits per month; providing more information, analytics, and marketing services than many of our competitors; offering the most comprehensive commercial real estate database available; and having the largest commercial real estate research department in the industry. We have created and compiled a standardized platform of real estate information and analytics and online marketplaces where industry professionals, consumers of commercial and residential real estate, including apartments, and the related business communities, can continuously interact and facilitate transactions by efficiently accessing and exchanging accurate and standardized real estate-related information. Our service offerings span all property types, including office, retail, industrial, multifamily, residential, land, mixed-use, and hospitality.

Our services are primarily derived from a database of building-specific and marketplace information and visual content and offer customers specialized tools for accessing, analyzing, and using our information and advertising on our marketplaces. Over time, we have expanded, and we expect to continue to expand, our existing information, analytics, and online marketplaces. We have developed and we expect to continue to develop additional services leveraging our centralized database and 3D digital twin technology to meet the needs of our existing customers as well as potential new categories of customers.

Our services are typically distributed to our customers under subscription-based license agreements that generally renew automatically, the majority of which have a term of at least one year. Upon renewal, many of the subscription contract rates may change in accordance with contract provisions or as a result of contract renegotiations. To encourage customers to use our services regularly, we generally charge a fixed monthly amount for our subscription-based services rather than charging fees based on actual platform usage or number of paid clicks. Depending on the type of service, contract rates are generally based on the number of sites, number of users, organization size, the customer’s business focus, the customer's geographic location, the number of properties reported on or analyzed, the number and types of services to which a customer subscribes, the number of digital twins hosted, the number of properties a customer advertises, and the prominence and placement of a customer's advertised properties in the search results. Our subscription customers generally pay contract fees on a monthly basis, but in some cases may pay us on a quarterly or annual basis. Our transaction-based services primarily consist of (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, and (iv) Ten-X auction fees.

Services

We operate, develop products, and deliver our services in two reportable segments, Commercial Real Estate and Residential Real Estate. Our Commercial Real Estate segment offers commercial real estate information and analytics, online marketplaces, and 3D digital twin technology. Our Residential Real Estate segment hosts marketplaces which aggregate consumer demand for homes and apartments and we sell marketing and leads to the agents, owners, landlords, and property management companies that need to reach those consumers with their offerings. Our principal services are described in the following paragraphs:

Commercial Real Estate

CoStar

CoStar is our subscription-based integrated platform for commercial real estate intelligence, which includes information about commercial real estate properties, properties for sale, comparable sales, tenants, space available for lease, industry professionals and their business relationships, industry news, and market status. CoStar also provides benchmarking for the hospitality industry under the STR brand, lease analytical capabilities, and risk management and other debt solutions for lenders. We also offer SaaS for lease management under the CoStar Real Estate Manager and Visual Lease brands.

LoopNet

Our LoopNet Network of commercial real estate websites offers online marketplaces across the U.S., Europe, and the U.K. that enable commercial property owners, landlords, and real estate agents to advertise properties for sale or for lease. Commercial real estate agents, buyers, and tenants use the LoopNet Network of online marketplaces to search for available property listings that meet their criteria. With the Domain Acquisition, we also offer commercial real estate listings in Australia.

Other Commercial Real Estate

Other Commercial Real Estate includes revenue from the Matterport Acquisition, BizBuySell Network, and Ten-X's online auctions for commercial real estate. Matterport primarily provides hosting services for its 3D digital twins on a subscription basis. Matterport also provides capture services of spatial data and other add-on services to existing subscription customers and sells 3D capture cameras and accessories. Our BizBuySell Network provides online marketplaces for businesses and franchises for sale.

We expect Commercial Real Estate's revenue growth rate for the year ending December 31, 2026 to moderate compared to the revenue growth rate for the year ended December 31, 2025 due to the lack of benefit from the Matterport Acquisition realized in 2025.

Residential Real Estate

Our residential marketplaces enable renters and homebuyers to find their dream homes by combining our proprietary research and neighborhood content with listing information, while enabling property owners, managers, and real estate agents to advertise their properties. Our flagship brands in the U.S. are Apartments.com, Homes.com, and Land.com. Apartments.com and Land.com provide comprehensive advertising on a subscription basis. Homes.com offers real estate agents subscription memberships promoting the agent's listings and profile on our websites, as well as the ability for real estate agents and homeowners to promote a single listing. Domain and OnTheMarket are our primary brands in Australia and the U.K., respectively. Domain primarily provides agents premium listings for individual properties. OnTheMarket hosts agents' listings on a subscription basis. We expect Residential Real Estate's revenue growth rate for the year ending December 31, 2026 to accelerate compared

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

We provide information, analytics, and online marketplace services to real estate and related business communities within the regions where we operate, which primarily include North America, Asia-Pacific, Europe, and Latin America. The functional currency for the majority of our 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.

Fluctuations in the British Pound, Canadian Dollar, Australian Dollar, and Euro may have an impact on our business, results of operations, and financial position. For the three months ended March 31, 2026, approximately 14% of our revenue was denominated in foreign currencies. For the three months ended March 31, 2026, our revenue would have decreased by approximately $12 million if the U.S. dollar exchange rate used strengthened by 10%. For the three months ended March 31, 2026, our revenue would have increased by approximately $12 million if the U.S. dollar exchange rate used weakened by 10%. In addition, we have assets and liabilities denominated in foreign currencies. As of March 31, 2026, accumulated other comprehensive income included a gain from foreign currency translation adjustments of approximately $131 million.

We do not believe we have material exposure to market risks associated with changes in interest rates related to cash equivalent securities held as of March 31, 2026. As of March 31, 2026, we had $1.3 billion of cash, cash equivalents, and restricted cash. If there is an increase or decrease in interest rates, there will be a corresponding increase or decrease in the amount of interest earned on our cash and cash equivalents. We currently diversify our cash and cash equivalents holdings amongst multiple financial institutions and AAA-rated Government and Treasury Money Market Funds.

We are subject to interest rate market risk in connection with our revolving credit facility. On May 24, 2024, we entered into the 2024 Credit Agreement, which provides for variable rate borrowings of up to $1.1 billion. On July 1, 2020, we issued $1.0 billion aggregate principal amount of Senior Notes. Changes in interest rates would not have a material impact to our current interest and debt financing expense, as all of our borrowings except for our credit facility are fixed rate, and no amounts were outstanding under our credit facility as of March 31, 2026. See Note 9 of the Notes to the Condensed Consolidated Financial Statements included in Part I of this Report for additional information regarding our 2024 Credit Agreement.

We had approximately $6.7 billion of goodwill and intangible assets as of March 31, 2026. As of March 31, 2026, we believe our intangible assets will be recoverable; however, changes in the economy, the industry in which we operate, and our own relative performance could change the assumptions used to evaluate intangible asset recoverability. In the event that we determine that an asset has been impaired, we would recognize an impairment charge equal to the amount by which the carrying amount of the assets exceeds the fair value of the assets. We continue to monitor these assumptions and their effect on the estimated recoverability of our intangible assets.

Item 4. Controls and Procedures

We maintain disclosure controls and procedures designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. These controls also are designed to ensure that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any systems of controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives. Accordingly, management is required to apply judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As of March 31, 2026, under the supervision and with the participation of our management, including our Chief Executive Officer and our Chief Financial Officer, we evaluated the effectiveness of our disclosure controls and procedures. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of March 31, 2026, and were operating at a reasonable assurance level.

We are continuing to integrate the internal controls over financial reporting of recent acquisitions. These activities may require modifications to certain processes, systems, and other components of internal controls over financial reporting. Consistent with our process changes, we evaluate the design and effectiveness of the internal controls as part of our overall assessment of disclosure controls and procedures.

Other than the integration activities associated with recent acquisitions, there were no changes in our internal control over financial reporting during our most recent fiscal quarter that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

PART II — OTHER INFORMATION

**Item 1.**Legal Proceedings

Currently, and from time to time, we are involved in litigation incidental to the conduct of our business. We are not currently a party to any lawsuit or proceeding that, in the opinion of our management based on consultations with legal counsel, is likely to have a material adverse effect on our financial position or results of operations. See Note 11 of the Notes to the Condensed Consolidated Financial Statements included in Part I of this Report for further discussion.

Item 1A. Risk Factors

In addition to the other information set forth in this Report, you should carefully consider the factors disclosed in Part I, Item 1A, “Risk Factors” in our 2025 Form 10-K, which could materially affect our business, financial condition or future results. Additional risks and uncertainties not currently known to us, or that we currently deem to be immaterial, may also have a material adverse effect on our business, financial condition, and/or results of operations. There have not been any material changes to the risk factors as previously disclosed in Part I, Item 1A, "Risk Factors” in our 2025 Form 10-K.

**Item 2.**Unregistered Sales of Equity Securities and Use of Proceeds

The following table is a summary of our repurchases of common stock during each of the three months ended March 31, 2026:

ISSUER PURCHASES OF EQUITY SECURITIES

2026Total Number of Shares Purchased**(1)** (in millions)Average Price Paid per ShareTotal Number of Shares Purchased as Part of Publicly Announced Plans or Programs**(2)** (in millions)Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Program**(2)** (in millions)
January 1 through 31—$66.31—$1,500
February 1 through 289.0$44.498.9$1,105
March 1 through 312.8$44.312.5$995
Total11.8$44.4411.4
__________________________

(1) The number includes CoStar Group Shares tendered by employees to the Company to satisfy the employees' minimum tax withholding obligations arising as a result of vesting of restricted stock grants under the Company’s 2025 Stock Incentive Plan, for which shares were purchased by the Company based on their fair market value on the trading day immediately preceding the vesting date.

(2) In December 2025, the Board of Directors approved the Stock Repurchase Program which authorizes the repurchase of up to $1.5 billion of outstanding CoStar Group Shares, with no expiration date. During the three months ended March 31, 2026, the Company repurchased 11.4 million CoStar Group Shares for an aggregate cost of $505 million. See Note 13 for further discussion regarding the Stock Repurchase Program and stock repurchase activity.

**Item 3.**Defaults Upon Senior Securities

None.

**Item 4.**Mine Safety Disclosures

Not applicable.

Item 5. Other Information

During the three months ended March 31, 2026, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K.

Item 6. Exhibits

Exhibit No.Description
3.1Fourth Amended and Restated Certificate of Incorporation (Incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed with the SEC on June 7, 2021).
3.2Fourth Amended and Restated By-Laws (Incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed with the SEC on May 9, 2022).
*10.1CoStar Group, Inc. Executive Severance Plan, dated as of January 6, 2026 (Incorporated by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed with the SEC on January 7, 2026).
*10.2CoStar Group, Inc. Amended Executive Severance Plan, dated as of February 13, 2026 (Incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed with the SEC on February 13, 2026).
*10.3Second Amendment, dated January 6, 2026, to the Employment Agreement between CoStar Realty Information, Inc. and Andrew C. Florance (Incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed with the SEC on January 7, 2026).
31.1Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
31.2Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith).
32.1Certification of Principal Executive Officer pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
32.2Certification of Principal Financial Officer pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
101.INSThe following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, formatted in Inline XBRL: (i) Condensed Consolidated Statements of Operations; (ii) Condensed Consolidated Statements of Comprehensive Income; (iii) Condensed Consolidated Balance Sheets; (iv) Condensed Consolidated Statements of Changes in Stockholders’ Equity; (v) Condensed Consolidated Statements of Cash Flows; and (vi) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text and including detailed tags.
101.SCHInline XBRL Taxonomy Extension Schema Document.
101.CALInline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEFInline XBRL Taxonomy Extension Definition Linkbase Document.
101.LABInline XBRL Taxonomy Extension Label Linkbase Document.
101.PREInline XBRL Taxonomy Extension Presentation Linkbase Document.
104The cover page from the Registrant's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, formatted in Inline XBRL (included as Exhibit 101).
  • Management Contract or Compensatory Plan or Arrangement.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

COSTAR GROUP, INC.
Date:April 29, 2026By:/s/ Christian M. Lown
Christian M. Lown Chief Financial Officer (Principal Financial Officer and Duly Authorized Officer)