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 present at Stephens 27th Annual Investment Conference. CFO Chris Lown and Head of Investor Relations Rich Simonelli will participate in a fireside chat on Thursday, November 20, 2025, at 9:00 a.m. CT. Live and recorded versions of the webcast will both be available under the Events & Presentations section of the CoStar Group Investor Relations website for at least 30 days: https://investors.costargroup.com/events-presentations.

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 143 million average monthly unique visitors in the third 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.

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Investor Relations:

Rich Simonelli

Head of Investor Relations

CoStar Group Investor Relations

(973) 896-8184

getrich@costar.com

News Media:

Matthew Blocher

Vice President

CoStar Group Corporate Marketing & Communications

(202) 346-6775

mblocher@costar.com