An amicus curiae, or “friend of the court,” is an individual or group who is not party to a legal action but may submit an amicus brief to the court to offer the court their views on the case. Attorneys general often submit amicus briefs in a wide range of cases where they have an interest in the outcome, especially when the result of the case could impact their own jurisdiction. Attorneys general also submit comments in federal and state agency rulemaking proceedings that may affect competition.
Recent antitrust amicus briefs and comments from attorneys general are listed below. Explore archives of earlier amicus briefs.
2023 Briefs
Brown v. Hartford Healthcare Corp., No. X03-HHD-CV22-6152239-S (Conn. Super. Ct.), March 13, 2023
Memorandum of the State of Connecticut Office of the Attorney General as Amicus Curiae
2022 Briefs
Deslandes v. McDonald’s, USA, No. 22-2333 and 22-2334 (7th Cir.), November 9, 2022
Brief of the states of Illinois, California, Colorado, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Maryland, Massachusetts, Minnesota, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island and Washington in Support of Plaintiffs-appellants and Reversal
Washington v. Albertson’s, No. 22-2-18046-3 SEA (King Cty. Super. Ct. 2022) November 9, 2022
Brief for the State of Oregon as Amicus Curiae in Support of the State of Washington’s Complaint for Injunction
Federal Trade Commission v. Meta Platforms, Inc., No. 5:22-04325 (N.D. Cal.), November 7, 2022
Brief of the states of New York, Alaska, California, Connecticut, Delaware, Hawaii, Idaho, Illinois, Maryland, Massachusetts, Minnesota, Mississippi, Montana, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, North Dakota, Oregon, Rhode Island, Utah, Washington, the District of Columbia and the Territory of Guam in Support of Plaintiff’s Motion for a Preliminary Injunction
Packers and Stockyards Act Comments, August 8, 2022
Comments of the Attorneys General of Minnesota, California, Delaware, Idaho, Illinois, Iowa, Pennsylvania, Maryland, Nevada, and North Carolina on U.S. Department of Agriculture, Agricultural Marketing Service Rulemaking on the Packers and Stockyards Act of 1921
Regeneron Pharmaceuticals, Inc. v. Novartis Pharma AG, No. 22-247 (2d Cir.)
Brief of the Amici Curiae Nevada, District of Columbia, Illinois, Louisiana, Minnesota and New Mexico in Support of Plaintiff-Appellant, Regeneron Pharmaceuticals, Inc.
Public Comments of 23 State Attorneys General, April 21, 2022
Comments from the Attorneys General of California, New York, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Illinois, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Jersey, New Mexico, Oregon, Pennsylvania, Rhode Island, Utah, Washington, and Wisconsin in response to the Joint FTC/USDOJ January 18, 2022 Request for Information on Merger Enforcement,
2021 Briefs
Federal Trade Commission v. Hackensack Meridien Health, No. 21-2603 (3rd Cir.)
Brief of the States of Pennsylvania, California, Colorado, Connecticut, Delaware, Idaho, Illinois, Indiana, Maryland, Massachusetts, Michigan, Minnesota, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, North Dakota, Oregon, Rhode Island, Virginia, Washington, Wisconsin, the District of Columbia, and the Territory of Guam as Amicus Curiae in support of the Appellee
NCAA v. Alston, Nos. 20-512 and 20-520 (S.Ct.)
Brief of Georgia, Alabama, Arkansas, Mississippi, Montana, North Dakota, South Carolina and South Dakota as Amici Curiae Supporting Petitioners
NCAA v. Alston, Nos. 20-512 and 20-520 (S.Ct.)
Brief of Arizona, Colorado, Delaware, Illinois, Minnesota, New York, Oregon and Pennsylvania as Amici curiae Supporting Respondents.
Brief for the States of Mississippi, Alabama, Arizona, Arkansas, Connecticut, Florida, Georgia, Idaho, Indiana, Iowa, Kentucky, Louisiana, Maine, Michigan, Minnesota, Montana, New Jersey, Oregon, South Carolina, Texas, Utah, Virginia, And West Virginia as Amici Curiae in support of Petitioner
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2020 Briefs
AMG Capital Management v. Federal Trade Commission, No. 19-508 (S.Ct.)
Brief of Illinois, Alaska, California, Colorado, Connecticut, Delaware, District of Columbia, Hawaii, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, South Dakota, Vermont, Virginia, Washington, and Wisconsin as Amici Curiae in support of Respondent
December 8, 2020
UFCW Local 1500 Welfare Fund et al. v. AbbVie Inc. et al., No. 20-2402 (7th Cir.)
Brief for Amici Curiae States of Washington, California, Colorado, Connecticut, Delaware, Idaho, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nebraska, New Mexico, New York, North Carolina, Oregon, Rhode Island, Virginia, and Wisconsin Supporting Plaintiffs-Appellants and Reversal
October 14, 2020
2019 Briefs
Stigar v. Dough Dough Inc., No. 18–cv-00244 (E.D. Wash.)
Amicus Curiae Brief by the Attorney General of Washington
March 11, 2019
2018 Briefs
Apple, Inc. v. Pepper, No. 17-204 (S.Ct.)
Brief for the States of Texas, Iowa, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Louisiana, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Montana, Nebraska, New Mexico, New York, North Dakota, Pennsylvania, Rhode Island, South Carolina, South Dakota, Virginia and the District of Columbia as Amici Curiae in Support of Respondents
October 01, 2018
U.S. v. AT&T Inc. No. 18-5214 (D.C. Cir.)
Brief of the States of Wisconsin, Alabama, Georgia, Louisiana, New Mexico, Oklahoma, South Carolina, Utah, and the Commonwealth of Kentucky as Amici Curiae in support of Defendants-Appellees
September 26, 2018
Mozilla v. Federal Communications Commission, No. 18-1051 (L), (D.C. Cir.)
Brief for the States of New York, California, Connecticut, Delaware, Hawaii, Illinois, Iowa, Kentucky, Maine, Maryland, Massachusetts, Minnesota, Mississippi, New Jersey, New Mexico, North Carolina, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, Washington, the District of Columbia, the County of Santa Clara, Santa Clara County Central Fire Protection District, and the California Public Utilities Commission
August 20, 2018
Louisiana Real Estate Appraisers Board v. FTC, No. 18-60291 (5th Cir.)
Brief for the States of Mississippi, Idaho, Iowa, Rhode Island, and Utah as Amici Curiae In Support of the Petitioner and in Support of a Reversal
July 11, 2018
U.S. Chamber of Commerce v. City of Seattle, No. 17-35640 (9th Cir.)
Brief for the States of Washington and California, Illinois, Iowa, Maine, Maryland, Massachusetts, Minnesota, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, and the District of Columbia in Support of Rehearing or Rehearing En Banc
July 05, 2018
Impax Laboratories v. Federal Trade Commission, No. 19-60394 (5th Cir.)
Brief of the States of Mississippi, Washington, Alaska, California, Colorado, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Illinois, Iowa, Maine, Maryland, Massachusetts, Minnesota, Montana, Nebraska, New Mexico, North Carolina, Oregon, Pennsylvania, Virginia, and Wisconsin as Amicus Curiae in Support of the Respondent
June 22, 2018
FTC and North Dakota v. Sanford Health, No. 17-3783 (8th Cir.)
Brief of the States of Minnesota, Alaska, California, Delaware, Hawaii, Idaho, Iowa, Massachusetts, Mississippi, Oregon, Pennsylvania, Puerto Rico, and Wyoming as Amicus Curiae in Support of the Appellees
March 13, 2018
Salt River Project Agricultural Improvement and Power District v. SolarCity Corp., No. 17-368 (S.Ct.)
Brief for the States of Tennessee, Arizona, Arkansas, Colorado, Georgia, Idaho, Indiana, Louisiana, Kansas, Mississippi, Missouri, Montana, Nebraska, New Hampshire, Ohio, Rhode Island, South Carolina, South Dakota, Texas, Utah, Vermont, West Virginia, Wisconsin, and Wyoming
January 20, 2018
2017 Briefs
State of Ohio v. American Express Co., No. 16-1454 (S. Ct.)
Brief for the States of New York, Alaska, California, Delaware, Hawaii, Indiana, Kentucky, Maine, Massachusetts, Minnesota, Mississippi, New Mexico, North Carolina, Oregon, Pennsylvania, South Carolina, Washington, Wisconsin, and the District of Columbia as Amici Curiae in Support of Petitioners
December 19, 2017
FTC and Commonwealth of Pennsylvania v. Penn State Hershey Medical Center, No. 17-2270 (3d Cir.)
Brief of the States of Washington, Delaware, Iowa, Idaho, Minnesota, North Dakota, Utah, Louisiana, New Mexico, and Indiana as Amicus Curiae in Support of the Appellants
December 18, 2017
Chamber of Commerce v. City of Seattle, No. 17-35640, (9th Cir.)
Brief for the States of New York, Hawaii, Illinois, Iowa, Maine, Maryland, Massachusetts, Minnesota, Oregon, Pennsylvania, Rhode Island, Vermont, and the District of Columbia as Amici Curiae In Support of Appellees
December 12, 2017
In Re: Wellbutrin Xl Antitrust Litigation, Nos. 15-3559&15-3591 (3rd Cir.)
Brief of the State of California as Amicus Curiae Requesting Panel’s Certification of State Law Question to the California Supreme Court In Support of Plaintiff-Appellants’ Petitions for Rehearing and Rehearing En Banc
September 07, 2017
Ohio et al. v. American Express Company, Petition for Certiorari
Cert Petition filed by Ohio, Connecticut, Idaho, Illinois, Iowa, Maryland, Michigan, Montana, Rhode Island, Utah, and Vermont
June 05, 2017
2016 Briefs
FTC and Illinois v. Advocate Health Care Network, No. 16-2492 (7th Cir.)
Brief of the States of Connecticut, Idaho, Iowa, Maine, Massachusetts, Minnesota, Mississippi, Montana, Oregon, Pennsylvania, and Washington as Amicus Curiae in Support of the Appellants
July 22, 2016
FTC and Pennsylvania v. Penn State Hershey Medical Center et al., No. 16-2365 (3rd Cir.)
Brief of the States of Idaho, Washington, California, Connecticut, Iowa, Illinois, Massachusetts, Maine, Minnesota, Mississippi, Montana, and Oregon as Amicus Curiae in Support of the Appellants
June 08, 2016
