Robin Rossmann will become chief financial officer of CoStar Group Inc. on July 31, 2026, moving into the role from his current post as managing director for Europe, the company announced on Monday.
Rossmann succeeds CFO Christian Lown, who is leaving to pursue an opportunity outside the company’s industry, the firm said in the announcement. CoStar said Lown’s departure was not related to any disagreement over its operations, policies or practices.
As CFO, Rossmann will lead CoStar’s global finance organization, overseeing financial and operational performance, capital allocation, financial planning and investor engagement, according to the announcement. He will report to founder and CEO Andy Florance.
Over the past two years, Rossmann has overseen a significant reset of CoStar’s European operations. The company said he eliminated about $51 million in costs — roughly 25% of its European cost structure — while still delivering double-digit revenue growth and launching CoStar in France.
Rossmann joined STR in 2016 to lead its businesses across EMEA, Asia Pacific and Latin America and became part of CoStar Group when it acquired STR in 2019. Over roughly a decade with STR and CoStar, he has helped launch products in global markets, execute and integrate acquisitions, scale international operations and drive strategic initiatives.
“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,” Florance said in the release, adding that Rossmann has delivered “strong organic revenue growth” and expanded margins across CoStar’s international businesses.
Rossmann, a chartered accountant, previously spent 13 years at Deloitte as a senior director advising global public and private real estate and hospitality companies in the United States, the United Kingdom and other markets. His work there included financial assurance, internal controls and risk management, due diligence, capital markets, debt advisory, valuation and investment appraisal.
“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,” Rossmann said.
Florance thanked Lown for his service on behalf of the board and the company.
“We appreciate his service and wish him continued success in his future endeavors,” he added.
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