 Shares of Clover Health Investments Corp. CLOV, 4.29 , which offers insurance plans to Medicare Advantage members, were off more than 6 in after-hours trading Monday after the company delivered a mixed earnings report and disclosed that its chief executive would be stepping down from that post at years end. The company posted a net loss of 104.2 million, compared with a loss of 317.6 million a year earlier. 