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. 

Attorney general antitrust amicus briefs from 2000-2015 are listed below. Explore more current briefs. 

2015 Briefs

City of Providence et al. v. Warner Chilcott Co. LLC, No. 14-2071 (1st Cir.)
Brief Amicus Curiae of the States of Maine, California, Alaska, Colorado, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Illinois, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Nebraska, New Hampshire, New Mexico, Oregon, Rhode Island, Tennessee, Texas, Utah, Vermont, and Washington Supporting Reversal
June 16, 2015

2014 Briefs

McWane, Inc. v. Federal Trade Commission, 14-11363 (11th Cir.)
Brief for Amici Curiae States of New York, Arizona, Connecticut, Hawaii, Idaho, Indiana, Iowa, Kentucky, Maryland, Mississippi, Nevada, New Mexico, and the Commonwealth of Puerto Rico in Support of Respondent
September 05, 2014

St. Luke’s Health Care System v. FTC, No. 14-35173 (9th Cir.)
Brief of Amicus Curiae the States of California, Washington, Pennsylvania, Connecticut, Delaware, Illinois, Iowa Kentucky, Maine, Maryland, Mississippi, Montana, Nevada, New Mexico, Oregon, and Tennessee in Support of Appellees
August 20, 2014

North Carolina State Board of Dental Examiners v. FTC, No. 13-534 (Supreme Court)
Brief of Amici Curiae States of West Virginia, Alabama, Arizona, Arkansas, Colorado, Connecticut, Delaware, Florida, Hawaii, Idaho, Indiana, Kansas, Kentucky, Maryland, Michigan, Nebraska, North Carolina, Ohio, Oregon, South Carolina, Tennessee, Utah, and Virginia In Support of Petitioner (Merits Brief)
May 30, 2014

King Drug Co. v. SmithKline Beecham Corp. No. 14-1243 (3rd Cir.)
Brief for the States of Mississippi, Alaska, Arkansas, Arizona, California, Connecticut, Delaware, Hawaii, Idaho, Illinois, Indiana, Kentucky, Massachusetts, Maryland, Michigan, Minnesota, New Hampshire, New Mexico, New York, Nevada, Ohio, Pennsylvania, Rhode Island, Tennessee, Texas, Utah, Vermont, and Washington as Amicus Curiae
April 25, 2014

2013 Briefs

North Carolina State Board of Dental Examiners v. FTC, No. 13-534 (Supreme Court)
Brief of Amici Curiae States of West Virginia, Alabama, Colorado, Delaware, Florida, Kansas, Maryland, North Carolina, Ohio, and South Carolina (Cert Brief)
November 27, 2013

Mississippi ex rel. Hood v. AU Optronics Corp. et al., No. 12-1036 (Supreme Court)
Brief of Amici Curiae State of Illinois and 45 Other States In Support of Petitioner
July 29, 2013

FTC v. Watson Pharmaceuticals, No. 12-416 (Supreme Court)
Brief for the States of New York, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Hawaii, Idaho, Illinois, Iowa, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nevada, New Hampshire, New Mexico, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Utah, Vermont, Washington, Wyoming, the District of Columbia, and the Commonwealth of Puerto Rico as Amici Curiae In Support of Petitioner
January 30, 2013

American Express Co. v. Italian colors Restaurant, No. 12-133 (Supreme Court)
Brief of the State of Ohio and 21 Other States as Amici Curiae In Support of Respondents
January 29, 2013

2012 Briefs

FTC v. Phoebe Putney Health System, Inc., et al., No. 11-1160 (Supreme Court)
Brief of Amici Curiae States of Illinois, Arizona, California, Colorado, Connecticut, Delaware, Hawaii, Idaho, Maryland, Michigan, Minnesota, Nevada, New Hampshire, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Tennessee, and West Virginia In Support of Petitioner
August 29, 2012

Ritz Camera & Image v. SanDisk Corporation, No. 12-1183 (Fed. Circuit)
Brief for States of New York, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Hawaii, Idaho, Illinois, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nevada, New Hampshire, New Mexico, North Dakota, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, Tennessee, Utah, Vermont, Washington, West Virginia, Wyoming, and the District of Columbia and Puerto Rico as Amici Curiae In Support of Appellee
May 24, 2012

2011 Briefs

In Re K-Dur Antitrust Litigation, No. 10-2077, 10-2078 and 10-2079 (3rd Cir.)
Brief of the States of Ohio, Alaska, Arizona, Arkansas, Idaho, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Nevada, New Mexico, South Carolina, Tennessee, Utah, Vermont, Washington, and Wyoming as Amici Curiae Supporting Appellants
May 18, 2011

FTC and Minnesota v. Lundbeck, Inc., No. 10-3458 and 3459 (8th Cir.)
Brief of Amici Curiae States of Missouri, Illinois, Arkansas, Iowa, Maryland, Nevada, New Mexico, North Dakota, South Dakota, and West Virginia In Support of Plaintiffs-Appellants
January 19, 2011

2010 Briefs

Oklahoma ex rel. Edmondson v. BP America Inc. et al., No. 10-6171 (10th Cir.)
Brief of Kansas, Ohio, and 36 Other States as Amici Curiae In Support of Appellee State of Oklahoma
September 27, 2010

Arkansas Carpenters Health and Welfare Fund et al. v. Bayer AG, No. 05-2851-cv(L) (2nd Cir.)
Brief of the Attorneys General of Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Iowa, Kentucky, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Montana, Nevada, New Hampshire, New Mexico, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, West Virginia, and Wyoming as Amici curiae In support of Petition for Rehearing En Banc Filed by Appellants Louisiana Wholesale Drug Co., Inc., CVS Pharmacy, Inc., Rite Aid Corporation and Arthur’s Drug Store, Inc.
May 20, 2010

2008 Briefs

California ex rel. Brown v. Safeway, Inc. et al., No. 08-55708 (9th Cir.)
Amici Curiae Brief of States of Arizona, Connecticut, Delaware, Maryland, Massachusetts, Mississippi, Missouri, Montana, Nevada, Ohio, Oklahoma, Oregon, Tennessee, Washington, and West Virginia In Support of Plaintiff-Appellant State of California
October 17, 2008

2007 Briefs

Rambus, Inc. v. FTC, No. 07-1124 (D.C. Cir.)
Brief of Ohio and 31 Other States and Commonwealths as Amici Curiae In Support of Respondent Federal Trade Commission
November 28, 2007

In re DDAVP Direct Purchaser Antitrust Litigation, No. 06-5525 (2d Cir.)
Brief of the State of New York and 41 Other States Supporting Plaintiffs-Appellants
May 30, 2007

Leegin Creative Leather Products, Inc. v PSKS, Inc., No. 06-480 (Supreme Court)
Brief for the States of New York, Alaska, Arkansas, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nevada, New Hampshire, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Utah, Vermont, Washington, West Virginia, and Wyoming as Amici Curiae Supporting Respondent
March 05, 2007

2006 Briefs

Costco Wholesale Corp. v. Hoen et al., No. 06-35538 (9th Cir.)
Brief of Ohio and 22 Other States as Amici Curiae on Behalf of Defendants/Appellants Seeking Reversal of District Court Order
November 13, 2006

2005 Briefs

FTC v. Schering-Plough Corp., No. 05-273 (Supreme Court)
Brief of States of Maryland, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Iowa, Kansas, Kentucky, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Montana, Nebraska, Nevada, North Carolina, North Dakota, Ohio, Oregon, Pennsylvania, South Carolina, Texas, Utah, Vermont, Virginia, West Virginia, Wisconsin, Wyoming, and the District of Columbia as Amici Curiae In Support of Federal Trade Commission
September 30, 2005

2003 Briefs

Atlantic Coast Airlines Holdings, Inc. v. Mesa Air Group, No. 1:03CV021982 (D.D.C.)
Brief of the District of Columbia and the Commonwealth of Virginia as Amici Curiae in Support of Plaintiff’s Motion for a Preliminary Injunction
December 08, 2003

Infineon Technologies AG et al. v. Rambus, Inc. No. 03-37 (Supreme Court)
Brief of the Commonwealth of Virginia and the States of Alabama, California, Connecticut, Idaho, Illinois, Iowa, Maryland, Massachusetts, Missouri, New Hampshire, Oregon, Oklahoma, Utah, West Virginia, and the Commonwealth of Puerto Rico as Amici Curiae in support of the Petition for Writ of Certiorari
August 06, 2003

Verizon Communications Inc. v. Law Offices of Curtis V. Trinko, No. 02-682 (Supreme Court)
Brief for the States of New York, Arizona, Connecticut, District of Columbia, Maine, Maryland, Michigan, Minnesota, Missouri, Montana, Oregon, Puerto Rico, Vermont, West Virginia, and Wisconsin as Amici Curiae In Support of Respondent
July 23, 2003

Verizon Communications Inc. v. Law Offices of Curtis V. Trinko, No. 02-682 (Supreme Court)
Brief Amicus Curiae of the Commonwealth of Virginia, the States of Alabama, Delaware, Indiana, Nebraska, New Hampshire, Oklahoma, and Utah In Support of Petitioner
May 28, 2003

2002 Briefs

Covad Communications Company v. Bell Atlantic Corp. et al., No. 02-7057 (D.C. Cir.)
Brief for Amici Curiae States of New York, Connecticut, Kansas, Maine, Maryland, Minnesota, Nevada, and Utah In Support of Reversal of the Order Appealed From
December 17, 2002

2000 Briefs

In re Potash Antitrust Litigation, No. 99-1844 (Supreme Court)
Brief of Amici Curiae States of Alabama, Arkansas, California, Colorado, Connecticut, Delaware, District Of Columbia, Florida, Hawaii, Idaho, Iowa, Kansas, Louisiana, Maine, Maryland, Michigan, Minnesota, Mississippi, Missouri, New Hampshire, New Mexico, New York, Nevada, North Carolina, North Dakota, Northern Mariana Islands, Ohio, Pennsylvania, Puerto Rico, South Carolina, South Dakota, Texas, Vermont, and West Virginia In Support of Petitioners
June 01, 2000