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Ninth Circuit Revives CoStar Competitor’s Antitrust Counterclaims

By Sulaiman Abdur-Rahman
June 30, 2025

The U.S. Court of Appeals for the Ninth Circuit on June 23 revived a competitor’s antitrust counterclaims against rival real estate data provider CoStar Group Inc.

Commercial Real Estate Exchange Inc. “plausibly alleges that CoStar has monopoly power in the relevant markets and engaged in anticompetitive conduct by entering de facto exclusive agreements and constructing technological barriers,” Judge Anthony D. Johnstone wrote in his opinion for the Ninth Circuit. “Therefore, we reverse the district court’s dismissal of claims 1–6.”

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