Justices Won't Review Antitrust Counterclaims Against CoStar

By Matthew Perlman · March 23, 2026, 9:43 AM EDT

The U.S. Supreme Court refused on Monday to review a ruling that revived antitrust counterclaims lodged against the commercial real estate platform CoStar in its case accusing a rival platform of...

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Order List

Case Information

Case Title

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

Case Number

Court

California Central

Nature of Suit

Copyright

Date Filed

September 25, 2020

Case Title

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

Case Number

Court

Supreme Court

Nature of Suit

3820 Copyright

Date Filed

December 08, 2025

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