CoStar Group

CoStar Group, Inc. (NASDAQ: CSGP), a leading provider of online real estate marketplaces, information, and analytics in the property markets, today announced the appointment of Robin Rossmann as Chief Financial Officer, effective July 31, 2026, succeeding Christian Lown, who is stepping down to pursue an opportunity outside the Company's industry. Rossmann will report to Andy Florance, Founder and Chief Executive Officer of CoStar Group. Rossmann will lead CoStar Group's global finance organization, overseeing the Company's financial and operational performance, capital allocation, financial planning and investor engagement as CoStar Group continues to expand its global platforms, increase profitability and create long-term value for shareholders.

Rossmann currently serves as CoStar Group's Managing Director, Europe, and is a member of the Company's executive leadership team. Over the past two years, he has distinguished himself by dramatically improving the margins of CoStar Group's European business — eliminating approximately $51 million in costs, roughly 25% of the European cost structure — while delivering double-digit revenue growth and launching CoStar in France. Rossmann joined STR in 2016, leading its businesses across EMEA, Asia Pacific and Latin America, and became part of CoStar Group through the Company's acquisition of STR in 2019.

Over the past decade with STR and CoStar Group, he has played a central role in launching CoStar Group products across global markets, executing and integrating acquisitions, scaling international operations and advancing strategic initiatives that have strengthened the Company's competitive position. "Robin is a rare executive who combines deep financial expertise with proven operating leadership and a demonstrated ability to dramatically reduce costs while accelerating growth," said Andy Florance, Founder and Chief Executive Officer of CoStar Group.

"During his time with CoStar Group, he has consistently delivered outstanding operating performance across our international businesses — driving strong organic revenue growth, expanding margins, successfully integrating acquisitions and launching our products in new markets. Robin knows our business, strategy and culture exceptionally well, and is deeply respected across our leadership team. I look forward to partnering with him as we sharpen our focus on margin expansion and profitable growth." "CoStar Group has built one of the strongest and most differentiated real estate technology companies in the world," said Rossmann.

"I am honored to assume the role of Chief Financial Officer at such an exciting point in the Company's evolution. I look forward to partnering with Andy, our leadership team and our employees to drive disciplined capital allocation, enhance operational efficiency, expand margins and support continued profitable growth while delivering long-term value for our shareholders." Prior to joining STR, Rossmann, a Chartered Accountant, spent 13 years at Deloitte, where he served as a Senior Director advising many of the world's leading public and private real estate and hospitality companies across the United States, the United Kingdom and other international markets.

His experience included financial assurance, internal controls and risk management, financial and commercial due diligence, capital markets transactions, debt advisory, valuation, business planning and investment appraisal. Lown will step down as Chief Financial Officer effective July 31, 2026. His departure was not the result of any disagreement with the Company relating to the Company's operations, policies or practices. "On behalf of the Board of Directors and the entire CoStar Group team, I want to thank Chris for his contributions during his tenure with the Company," said Florance.

"We appreciate his service and wish him continued success in his future endeavors." 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. com , the fastest-growing residential real estate marketplace; and Domain, one of Australia's leading property marketplaces.

The Company'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 131 million average monthly unique visitors in the first quarter of 2026, serving clients around the world. Headquartered in Arlington, Virginia, the Company is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence.

From time to time, CoStar Group plans to utilize its corporate website as a channel of distribution for material Company information. com . This news release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements include, but are not limited to, statements about CoStar Group's plans, objectives, expectations, beliefs and intentions and other statements including words such as “hope,” “anticipate,” “may,” “likely,” “might,” “believe,” “expect,” “observe,” “consider,” “think,” “intend,” “envision,” “will,” “should,” “could,” “would,” “plan,” “target,” “goal,” “estimate,” “predict,” “continue,” “commit,” and “potential” or the negative of these terms or other comparable terminology.

Such statements are based upon the current beliefs and expectations of management of CoStar Group and are subject to many risks and uncertainties. Actual results may differ materially from the results anticipated in the forward-looking statements and the assumptions and estimates used as a basis for the forward-looking statements.