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Malm Inc. v. CoStar Group Inc.
Filed
April 2026
Jurisdiction
Federal Court (TBD)
Plaintiff Firm
Susman Godfrey / Berger Montague
Next Milestone
Service of process; CoStar expected to file motion to dismiss
CoStar allegedly unlawfully monopolized commercial real estate data and information services, controlling ~80% of U.S. CRE listing and information markets via LoopNet.com; restrictive noncompetes and cross-post limits harm competition
First of two antitrust class actions filed against CoStar in April 2026. Susman Godfrey — one of the three key plaintiff firms in the residential commission cases — is co-counsel, signaling a potential expansion of real estate antitrust litigation into the commercial data sector. Seeks treble damages and permanent injunctive relief.
Complaint Filed
April 21, 2026Susman Godfrey and Berger Montague file antitrust class action against CoStar on behalf of CRE broker Malm Inc., alleging monopolization of commercial real estate data markets
CoStar Responds
April 21, 2026CoStar general counsel states: 'CoStar will vigorously defend against these baseless allegations and will prevail'
Category
Platform & Tech LitigationParallel antitrust class action alleging CoStar monopolized commercial real estate data and information services; restrictive noncompetes and cross-post limits prevent competition from LoopNet rivals
Category
Platform & Tech LitigationZillow's Listing Access Standards ban listings previously marketed privately
Category
Platform & Tech LitigationZillow steers buyers to Zillow-affiliated Flex agents, taking up to 40% commission without disclosure
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