CoStar Rival Urges High Court To Reject Antitrust Appeal

By Matthew Perlman · February 17, 2026, 6:00 PM EST

A rival accusing CoStar of blocking competition for commercial real estate listing services is urging the U.S. Supreme Court not to review a ruling that revived the rival's counterclaims, saying that...

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Case Information

Case Title

CoStar Group, Inc., et al., Petitioners v. Commercial Real Estate Exchange, Inc.

Case Number

25-667

Court

Supreme Court

Nature of Suit

3820 Copyright

Date Filed

December 08, 2025