July 02, 2026
CoStar Group has urged a Washington, D.C., federal judge to transfer a brokerage's antitrust lawsuit against the company to Virginia federal court, citing a mandatory forum selection clause in its terms of service that the plaintiff, a CoStar customer, had agreed to 43 times.
June 25, 2026
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 real estate information and property listing services.
May 21, 2026
A Washington, D.C., brokerage has filed a proposed class action against CoStar in federal court, alleging a decades-long anticompetitive scheme designed to maintain a monopoly over commercial real estate listing services and information services.