Side-by-side comparison of AI visibility scores, market position, and capabilities
NASDAQ: Z largest US real estate marketplace with 204M monthly users and Zestimate AI valuations at $2.2B revenue; Premier Agent program and Zillow Home Loans competing with Realtor.com and Redfin for real estate transaction share.
Zillow Group is a Seattle-based real estate technology company — listed on NASDAQ (NASDAQ: Z and ZG) — operating the largest US real estate marketplace with 204 million monthly unique users browsing 160+ million US property listings, home valuations (the proprietary Zestimate AI algorithm), rental listings, and mortgage services, generating $2.2 billion in revenue in fiscal year 2024 through its Premier Agent program (paying real estate agents for lead referrals from buyers and sellers searching on Zillow), Zillow Home Loans (mortgage origination), and rental marketplace revenue. Founded in 2006 by Rich Barton and Lloyd Frink (former Microsoft and Expedia executives), Zillow created the consumer real estate search category with the Zestimate home valuation tool that gave homeowners and buyers unprecedented access to estimated market values outside of broker relationships.
$2.74B revenue 2024 (+11% YoY); $732M Q1 2025 revenue (+12% YoY); 56th consecutive quarter double-digit growth; 134M+ monthly unique visitors Q4 2024; 6,400+ employees in 14 countries
CoStar Group is the leading provider of commercial real estate data, analytics, and marketplace platforms, founded in 1987 in Washington, D.C. by Andrew Florance. The company was built on the conviction that commercial real estate — one of the world's largest asset classes — was fundamentally underserved by reliable data, and that building a proprietary research infrastructure to collect, verify, and distribute property information would create a durable competitive moat. CoStar's core technology combines a massive field research organization with digital data collection tools to maintain the most comprehensive commercial real estate database in the world.\n\nCoStar's product portfolio spans multiple platforms serving different segments of the real estate market: CoStar for commercial real estate professionals, LoopNet for commercial property marketing, Apartments.com for multifamily rental search, Homes.com for residential real estate, and Ten-X for online commercial property auctions. This multi-platform strategy positions CoStar Group as the data and marketplace layer across every major real estate segment. The company attracted more than 134 million unique monthly visitors across its networks in Q4 2024, demonstrating the scale of its audience reach.\n\nCoStar Group reported $2.74 billion in revenue for 2024, an 11% year-over-year increase, marking its 56th consecutive quarter of double-digit revenue growth — a remarkable consistency streak in enterprise SaaS. The company's combination of proprietary data assets, marketplace network effects, and expanding residential real estate ambitions gives it multiple growth vectors as it targets the vast residential brokerage market that dwarfs its existing commercial business.
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