Zillow Group Inc. lost its bid to force Illinois’ largest provider of real estate listings to provide access to its data about homes for sale. US District Judge John Tharp Jr. in Chicago dissolved a previous order that required Midwest Real Estate Data, the multiple listings service for the Chicagoland area, to temporarily maintain Zillow’s access to listings. Tharp ordered Zillow to engage in arbitration over its listings contract with MRED.

The ruling is a setback for Zillow in its antitrust battle over access to listing data in the Chicago area. The case highlights ongoing tensions between real estate listing services and platforms like Zillow over data access and competition.

The decision was issued on September 16, 2026, by Judge Tharp in Chicago. Zillow must now pursue arbitration with MRED, the multiple listings service for the Chicagoland area.