CoStar Customers Say Antitrust Suit Must Stay In DC

By Isaac Monterose · June 25, 2026, 6:11 PM EDT

Customers asked a D.C. federal court to reject CoStar's bid to transfer their proposed antitrust class action, which claims the company ran an anticompetitive scheme to protect its monopoly for commercial...

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Case Information

Case Title

ONE REAL ESTATE LLC v. COSTAR GROUP, INC. et al

Case Number

1:26-cv-01735

Court

District Of Columbia

Nature of Suit

Anti-Trust

Date Filed

May 20, 2026