CoStar Group’s Stockholders Should Be Wary of D. E. Shaw’s True Motivations

CoStar Group, Inc. (NASDAQ: CSGP), a leading provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets, today issued the following statement.

Contrary to D. E. Shaw’s misleading claims, CoStar Group has never reported Homes.com results as a separate segment. CoStar Group changed our reporting segments from geography-based to product portfolio-based to align with how we run our business. Our new segment disclosure actually offers more transparency by providing audited revenue, EBITDA, Adjusted EBITDA and margin disclosures for both the Residential and Commercial segments in our recent 10-K, as well as continuing to provide disaggregated revenue disclosures. Investors should expect similar Homes.com disclosures on our earnings calls that CoStar Group has always provided to stockholders.

If D. E. Shaw is worried about transparency, it should start with itself. D.E. Shaw has never disclosed its economic exposure to CoStar Group, or even if it is a net long investor. Public filings suggest D. E. Shaw owns just 0.22% of CoStar Group’s common stock, but almost 4x that value in CoStar Group competitors¹ who would directly benefit from D. E. Shaw’s push for us to abandon Homes.com and eliminate the fastest growing residential real estate platform in the industry. CoStar Group stockholders should ask if D. E. Shaw’s real agenda is to unlock value through its investment in CoStar Group or in our competitors at the expense of CoStar Group stockholders.

CoStar Group has also added Clare Locke, LLP, a leading litigation boutique representing clients in complex defamation matters and high-profile reputational attacks, to bolster its team of advisors, including Goldman Sachs & Co. LLC, as financial advisor, Latham & Watkins LLP as legal counsel, and Joele Frank, strategic communications advisor.

About CoStar Group

CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.

CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom.

CoStar Group’s websites attracted over 139 million average monthly unique visitors in the fourth quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.

Forward Looking Statements

This press release includes “forward-looking statements”. Potential factors that may cause actual results to differ materially from those projected in these forward-looking statements are described in CoStar Group’s periodic filings with the Securities and Exchange Commission (“SEC”), such as Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, and Current Reports on Form 8-K, including the “Risk Factors” sections of those documents. These filings can be accessed via the SEC’s website at www.sec.gov. All forward-looking statements reflect information available to CoStar Group as of the date of this press release, and CoStar Group undertakes no obligation to update or revise any forward-looking statements unless required by applicable law.

¹ Per D.E. Shaw’s Q4’25 13F filing for common stock, call option, and warrant exposure to Anywhere Real Estate, Compass, Opendoor Technologies, Rocket Companies, and Zillow. Values assume warrants are exercised and holdings priced as of December 31, 2025.

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