Aetna Inc. [AET]
Centene Corporation [CNC] CIGNA Corporation [CI] Coventry Health Care, Inc.
Express Scripts Holding Co. [ESRX]
Health Net, Inc. [HNT] Humana Inc. [HUM]
Magellan Health Services, Inc. [MGLN] Metropolitan Health Networks, Inc. Molina Healthcare, Inc. [MOH]
UnitedHealth Group Incorporated [UNH] Universal American Corp. [UAM]
WellCare Health Plans, Inc. [WCG] WellPoint, Inc. [WLP]