CoStar Group, Inc. (NASDAQ:CSGP), a leading provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets, will announce financial results for the third quarter of 2026 following the market close on Tuesday, October 27, 2026. Management will conduct a conference call to discuss the third quarter results, as well as the Company’s outlook at 5:00 PM EDT that same day.

A live audio webcast of the conference call will be available in listen-only mode through the Investors section of the CoStar Group website: https://investors.costargroup.com. A replay of the webcast audio will also be available in the Investors section of our website for a period of time following the call.

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; Zonda, a leading provider of data, analytics, software, and marketplace solutions for the residential construction industry; 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 118 million average monthly unique visitors in the second quarter of 2026, 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.

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Investor Relations:

Rich Simonelli

Head of Investor Relations

CoStar Group Investor Relations

(973) 896-8184

rsimonelli@costar.com

News Media:

Matthew Blocher

Vice President

CoStar Group Corporate Marketing & Communications

(202) 346-6775

mblocher@costar.com