No. 25-667

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

Lower Court: Ninth Circuit
Docketed: 2025-12-08
Status: Pending
Type: Paid
Amici (2)Response RequestedResponse Waived Experienced Counsel
Tags: antitrust exclusive-dealing ninth-circuit plausible-relief refusal-to-deal sherman-act
Key Terms:
Antitrust CriminalProcedure Trademark Copyright JusticiabilityDoctri
Latest Conference: 2026-01-16
Question Presented (AI Summary)

Whether a 'de facto' exclusive dealing claim is cognizable under the Sherman Act in the absence of exclusive contractual terms, programs, or policies, and whether a refusal-to-deal claim prohibited by Trinko is cognizable if the plaintiff calls it something else

Question Presented (from Petition)

In Bell Atlantic Corp. v. Twombly , this Court recognized the risk of allowing antitrust claims to proceed past the pleading stage in the absence of a “plausible entitlement to relief.” 550 U.S. 544, 559 (2007). That risk is particularly acute when a court relies on novel and vague theories of antitrust law. The Ninth Circuit’s decision raises precisely that concern: the court reversed the grant of a motion to dismiss based on two th eories that provide no plausible entitlement to relief under the Sherman Act or this Court’s case law—and that have given rise to conflict and confusion among the courts of appeals. The questions presented are: 1. Whether a “de facto” exclusive dealing claim is cognizable under the Sherman Act in the absence of exclusive contractual terms, programs, or policies. 2. Whether a refusal-to-deal claim prohibited by Verizon Communications Inc. v. Law Offices of Curtis V. Trinko, LLP , 540 U.S. 398 (2004), is cognizable if the plaintiff calls it something else.

Docket Entries

2026-02-13
Brief of Commercial Real Estate Exch., Inc. in opposition submitted.
2026-01-14
Response Requested. (Due February 13, 2026)
2026-01-07
Brief amici curiae of Former Antitrust Officials, et al. filed. (Distributed)
2026-01-07
Brief amicus curiae of Chamber of Progress filed. (Distributed)
2025-12-30
DISTRIBUTED for Conference of 1/16/2026.
2025-12-26
Waiver of Commercial Real Estate Exch., Inc. of right to respond submitted.
2025-12-26
Waiver of right of respondent Commercial Real Estate Exch., Inc. to respond filed.
2025-12-04
Petition for a writ of certiorari filed. (Response due January 7, 2026)

Attorneys

Chamber of Progress
Steven Paul LehotskyLehotsky Keller Cohn LLP, Amicus
Steven Paul LehotskyLehotsky Keller Cohn LLP, Amicus
Commercial Real Estate Exch., Inc.
Ellyde Roko ThompsonQuinn Emanuel Urquhart & Sullivan, LLP, Respondent
Ellyde Roko ThompsonQuinn Emanuel Urquhart & Sullivan, LLP, Respondent
CoStar Group, Inc.; CoStar Realty Information, Inc.
Melissa Arbus SherryLatham & Watkins LLP, Petitioner
Melissa Arbus SherryLatham & Watkins LLP, Petitioner
Former Antitrust Officials And Antitrust Scholars In Support Of Petitioners
Benjamin Milton MundelSidley Austin LLP, Amicus
Benjamin Milton MundelSidley Austin LLP, Amicus