9th Circ. Revives Antitrust Counterclaims Against CoStar

By Matthew Perlman · June 23, 2025, 8:30 PM EDT

A Ninth Circuit panel on Monday revived counterclaims accusing CoStar of monopolizing commercial real estate information markets in the company's case accusing a rival of engaging in "industrial-scale" copyright infringement....

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Documents

Case Information

Case Title

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

Case Number

2:20-cv-08819

Court

California Central

Nature of Suit

Copyright

Date Filed

September 25, 2020


Case Title

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

Case Number

23-55662

Court

Appellate - 9th Circuit

Nature of Suit

3820 Copyright

Date Filed

July 27, 2023