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

Pending petition

Docket No. Op. BelowArgument Opinion Vote Author Term
25-667 9th Cir. TBD TBD TBD TBD TBD

Issue: (1) Whether a “de facto” exclusive dealing claim is cognizable under the Sherman Act in the absence of exclusive contractual terms, programs, or policies; and (2) whether a refusal-to-deal claim prohibited by Verizon Communications Inc. v. Law Offices of Curtis V. Trinko, LLP is cognizable if the plaintiff calls it something else.

DateProceedings and Orders (key to color coding)
12/04/2025Petition for a writ of certiorari filed. (Response due January 7, 2026)
12/26/2025Waiver of right of respondent Commercial Real Estate Exch., Inc. to respond filed.
12/30/2025DISTRIBUTED for Conference of 1/16/2026.
01/07/2026Brief amici curiae of Former Antitrust Officials, et al. filed. (Distributed)
01/07/2026Brief amicus curiae of Chamber of Progress filed. (Distributed)
01/14/2026Response Requested. (Due February 13, 2026)
02/13/2026Brief of respondent Commercial Real Estate Exchange, Inc. in opposition filed.
03/03/2026Reply of petitioners CoStar Group, Inc.; et al. filed. (Distributed)
03/04/2026DISTRIBUTED for Conference of 3/20/2026.