Zillow has sued the Multiple Listing Service of Northern Illinois (MRED) and real estate brokerage Compass, alleging they conspired to manipulate access to private listings in the Chicago market. The lawsuit invokes the Sherman Act, the federal antitrust law that prohibits monopolistic practices and collusive behavior.
Zillow claims MRED leveraged its control over Chicagoland MLS data to coerce Compass private listings onto Zillow's platform. The complaint suggests MRED used its gatekeeping power over MLS information to pressure brokers into compliance. This marks an escalation in Zillow's ongoing battles over listing visibility and market access.
The case touches a raw nerve in real estate tech. Private listings, where brokers sell properties off-market to select buyers, have grown aggressively over the past five years. Compass and other high-end brokerages use private listings to control inventory and retain buyer relationships. Zillow, which depends on comprehensive listing data to drive traffic and ad revenue, views private listing growth as a threat to its platform utility.
MRED controls one of the largest regional MLS databases in the country, covering 17,000 square miles around Chicago and serving over 80,000 agents. That scale gives MRED outsized power over local market information. Zillow's suit argues MRED weaponized that power to dictate where Compass listings appear.
Compass has built its business partly on off-market deals that bypass traditional listing portals. If Zillow prevails, it could force Compass and other brokerages to disclose more private listings to major platforms. The ruling could reshape how off-market sales operate across the country.
For sellers, the case matters because it determines whether private listings stay hidden or get broader exposure. For buyers, expanded visibility could mean better access to available