California

• California Public Employees' Retirement System
• Los Angeles City Employees' Retirement System
• Los Angeles County Employees Retirement Association

• Colorado Public Employees Retirement Association

• City of Valdosta, Ga.

• City of Naperville, Ill.

• Kentucky Retirement Systems
• Kentucky Teachers' Retirement System

• Michigan Office of Retirement Services
• Municipal Employees' Retirement System of Michigan

• Dakota County, Minn.
• Minnesota State Retirement System

• Missoula County, Mont.
• State of Montana

• New Mexico Retiree Health Care Authority

• City of Auburn, N.Y.

• State of Nevada Public Employees' Benefit Program

• Ohio Public Employees' Retirement System
• Ohio Police & Fire Pension Fund
• Ohio School Employees' Retirement System
• State Teachers' Retirement System of Ohio

• Pennsylvania School Employees' Retirement System

• Employees Retirement System of Texas

• Active Health
• Humana
• Independent Pharmaceutical Consultants, Inc.
• Medco Health Solutions