FOUNDER AND CHIEF EXECUTIVE OFFICER Director Since: 1987 Age: 62 Education: B.A., Economics, Princeton University REASONS FOR NOMINATION Andrew Florance provides the Board with founder-level insight into CoStar Group s strategy, competitive positioning, and platform development. Since launching the Company in 1987, he has overseen its evolution into a scaled, multi-brand enterprise serving commercial and residential real estate markets. His long-standing leadership, direct involvement in product innovation and capital deployment, and deep understanding of the information services industry provides the Board with valuable perspective on CoStar Group s key strategic initiatives, operating discipline, and sustained value creation priorities. KEY SKILLS AND QUALIFICATIONS Industry / Commercial Real Estate: As Founder and Chief Executive Officer, Mr. Florance has led CoStar Group s growth from inception through its 1998 initial public offering and into an S&P 500 and NASDAQ-100 company operating across global real estate data, analytics, online marketplaces, and 3D digital twin technology platforms. Under his leadership, CoStar Group has expanded its coverage across office, industrial, retail, multifamily, hospitality, and residential markets, establishing a scaled and comprehensive global digital real estate ecosystem. In 2026, Mr. Florance was named among the top ten most powerful executives in the U.S. residential real estate industry by the Swanepoel Power 200. He was also named a Washingtonian Magazine Tech Titan in 2025 for the fourth consecutive year and was included on Commercial Observer s 2025 Power 100 list. Business Development and M&A: Mr. Florance has led more than 40 strategic acquisitions across 14 countries, broadening CoStar Group s data assets, marketplace capabilities, and reach in existing and adjacent markets. His disciplined approach to both strategic acquisitions and organic investments have supported the continued growth and diversification of CoStar Group s platforms and revenue streams. In 2025, he led the acquisition of Domain, one of Australia s most recognized and trusted property platforms, leading to a record number of monthly unique platform visitors within just weeks of acquisition, and the purchase of Matterport, the global leader of 3D digital twin technology for property marketing and visualization. With the 2021 acquisition of Homes.com, Mr. Florance has scaled the CoStar platform to become the second-largest residential real estate portal in the U.S., with 108 million average monthly unique visitors and nearly $100 million in annual run-rate revenue. Marketing and Sales: Mr. Florance has built and scaled CoStar Group s subscription-based business model leading to durable revenue growth, leverageable margin structures, and robust free cash flow. He spearheaded the digitization of the real estate industry, with CoStar Group now serving clients around the world and attracting over 139 million average monthly unique visitors across the Company s platforms. He has guided pricing strategy, sales execution, and brand positioning across asset classes, reinforcing CoStar Group s recurring revenue foundation. CAREER HIGHLIGHTS CoStar Group, Inc. (Nasdaq: CSGP) , a leading global provider of real estate information, analytics, online marketplaces, and 3D digital twin technology Founder and Chief Executive Officer (since 1987)