Here's a quick breakdown of major health insurance company stock performance from Oct. 27 to Friday's market close: * Coventry Health Care, Inc. is up 31.6 percent; * CIGNA Corp. is up 29.1 percent; * Aetna Inc. is up 27.1 percent; * WellPoint, Inc. is up 26.6 percent; * UnitedHealth Group Inc. is up 20.5 percent; * And Humana Inc. is up 13.6 percent.