CoStar Group (NASDAQ:CSGP), a leading provider of online real estate marketplaces, information, and analytics, today announced it has been ranked No. 1 on the Washington Business Journal's annual list of public companies with the highest representation of women on their boards of directors.

This recognition reflects CoStar Group's longstanding commitment to building a board that sets the standard for corporate governance - not merely meets it. The Company believes that a truly effective board requires directors of the highest integrity and character, and that diverse perspectives are essential to sound oversight, rigorous accountability, and sustainable value creation for all stockholders.

CoStar Group's Board of Directors is composed of highly accomplished, independent leaders with deep expertise spanning technology, finance, real estate, media, and corporate strategy. The Board has been purposefully refreshed, with more than half of its independent directors appointed in the last three years, ensuring the Company benefits from fresh perspectives while maintaining the institutional knowledge and stability that have driven CoStar Group's track record of long-term outperformance.

The Company believes its Board reflects the values that stockholders, employees, and the broader community expect of a responsible public company - a commitment to excellence, inclusion, and principled leadership at the highest levels.

"We are proud to be recognized by the Washington Business Journal for our Board's leadership in this area," said Andy Florance, Founder and Chief Executive Officer of CoStar Group. "The men and women who serve on our Board bring not only extraordinary professional expertise, but the character, integrity, and judgment that our stockholders deserve. Their guidance shapes our strategy, strengthens our execution, and positions CoStar Group for long-term growth and value creation. I want to personally thank each of our outstanding directors for their contributions and their unwavering commitment to doing right by our company and all of our stakeholders."

CoStar Group is confident that it has the right board to continue guiding the Company's mission to build the world's leading digital real estate platform and to create substantial, durable stockholder value.

The Washington Business Journal's annual ranking recognizes publicly traded companies in the Washington, D.C. metropolitan area with the strongest representation of women on their boards of directors.

For more information, visit: https://bit.ly/3Qm0Yta.

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.

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News Media:

Matthew Blocher

CoStar Group Corporate Marketing & Communications

(202) 346-6775

mblocher@costar.com

CoStar Group Ranked No. 1 on Washington Business Journal's List of Women on Public Company Boards