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CoStar Urges Supreme Court to Block Antitrust Claims in CREXi Fight

By  |  December 10, 2025

CoStar Group has asked the U.S. Supreme Court to intervene in its ongoing dispute with Commercial Real Estate Exchange Inc (CREXi), arguing that a recent appellate ruling could discourage technological innovation and lead to a surge in litigation, according to Reuters.

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    The Washington-based property data firm petitioned the justices after the San Francisco-based 9th U.S. Circuit Court of Appeals reinstated antitrust allegations against CoStar in June. The appeals court revived claims that had previously been dismissed by a lower court, per Reuters.

    CREXi has accused CoStar of using restrictive business practices that force real estate brokers to remain tied to CoStar’s platforms while cutting off competitors from vital online tools. The antitrust allegations were filed as counterclaims in a copyright suit CoStar initiated in 2020.

    CoStar has rejected the accusations of anticompetitive conduct and maintains that it is not required to give rival companies access to its data or websites. CoStar general counsel Gene Boxer said in a statement that the claims “were concocted in order to manufacture leverage after CREXi was caught red-handed engaging in mass infringement,” according to Reuters.

    Related: CoStar Defeats Real Estate Antitrust Suit

    The company’s copyright lawsuit alleges that CREXi copied tens of thousands of images from CoStar’s proprietary listings, describing the alleged activity as a large-scale international infringement effort.

    CREXi pushed back on the Supreme Court request, calling it “just another attempt by CoStar to delay its inevitable liability for years of anticompetitive misconduct against the commercial real estate industry,” per Reuters.

    In its filing, CoStar argued that the 9th Circuit’s decision contradicts established legal principles by allowing an antitrust case to proceed despite the company’s contracts being explicitly nonexclusive. The petition also cited a prior Supreme Court ruling that generally permits companies to decline business dealings with competitors.

    CoStar warned that leaving the appellate ruling in place could discourage companies from building proprietary technologies if courts can compel them to share those assets with rivals, according to Reuters.

    The case is CoStar Group Inc v. Commercial Real Estate Exchange Inc., U.S. Supreme Court, No. 25-667. CoStar is represented by Melissa Arbus Sherry of Latham & Watkins.

    Source: Reuters