CoStar Wants High Court Review Of Antitrust Counterclaims

By Isaac Monterose · March 4, 2026, 3:57 PM EST

CoStar Group Inc. and CoStar Realty Information Inc. made another attempt to persuade the U.S. Supreme Court to review the revived antitrust counterclaims lodged by CoStar's business rival, Commercial Real Estate...

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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