Largest U.S. Brokerage Compass Sues Zillow Over 24-Hour Private Listing Ban, Citing Antitrust Violations in New York Court

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Updated Jun 30, 2025, 06:38 PM

Compass Inc., the largest U.S. residential real estate brokerage by sales volume, has filed an antitrust lawsuit against Zillow Group Inc., the nation's largest online real estate portal, in the U.S. District Court for the Southern District of New York. The lawsuit alleges that Zillow's policy to ban private home listings that are not posted on its platform within 24 hours constitutes anticompetitive behavior designed to protect Zillow's market dominance and revenues.

Zillow announced that any publicly marketed listings must appear on multiple listing services (MLS) within one business day or risk being banned from its site. Compass claims this "Zillow ban" undermines competition by restricting the ability of brokers to share privately marketed listings outside Zillow’s platform, which Compass argues violates federal antitrust laws. The dispute escalates an ongoing battle over private listing networks between two of the largest residential real estate companies in the U.S. Compass has also requested a temporary court injunction to block Zillow’s policy enforcement, citing immediate harm and market confusion. The conflict highlights the growing power struggle in the online real estate market as Zillow operates both as a portal and a brokerage nationwide. Nearly half of Compass' listings earlier this year originated as privately marketed listings, underscoring the potential impact of Zillow’s new policy on Compass and other brokers. The case is seen as a pivotal moment in real estate antitrust litigation, with broader implications for how home listings are marketed and controlled in the digital age.

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#Zillow #MLS #Compass

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Sources

reuters.com(6)law360.com(4)cbsnews.com(4)inman.com(3)

Inman

@Inman

It's reckoning day for private listings. Starting today, sellers need to decide whether they want to have their properties marketed on private listing networks, or have them appear on @zillow.

David Levitt

@dmlevitt

W/#Compass tell #Zillow? Probly not. W/Compass sue Zillow? Probly yes, as new kid on block complains listing giant used monopoly power to keep Compass out. #realestate #CRE #NYC #litigation #eXp #Redfin

Fast Company

@FastCompany

A new real estate game just launched, and you can think of it as a mashup between HQ Trivia and Zillow. PropQwiz is live real estate game that gives away $350,000 to put towards a home.