CoStar must face rival's antitrust claims after US Supreme Court order

CoStar

23/03/2026 17:48

By Mike Scarcella

WASHINGTON, March 23 (Reuters) - The U.S. Supreme Court on Monday declined to hear CoStar Group’s (CSGP.O) bid to throw out antitrust claims lodged by real estate data provider Commercial Real Estate Exchange in a long-running legal fight between the rival companies.

Here are some details:

The justices ruled without comment, keeping in place a lower appeals court decision that allowed CREXi's case to proceed.

CREXi is seeking an unspecified amount of damages for lost revenue and profits based on its claims that CoStar violated antitrust law by locking real estate brokers into using its data platforms and blocking rivals from accessing key web tools.

CoStar has denied any wrongdoing, saying it has no obligation to provide competitors access to its websites and databases.

California-based CREXi made its antitrust allegations as counterclaims against CoStar in a copyright lawsuit that CoStar lodged against CREXi in 2020.

CoStar’s ongoing lawsuit accuses CREXi of deliberately copying tens of thousands of CoStar photos of real estate properties in an alleged copyright infringement scheme.

CoStar said in a statement that CREXi’s “antitrust counterclaims are a sideshow to CoStar Group's underlying mass copyright infringement claims against CREXi” and that the allegations will not delay the infringement trial.

(Reporting by Mike Scarcella)

((Email: mike.scarcella@thomsonreuters.com; Phone: 202-985-8228.))