联合健康(UNH.US)盘前继续下跌5%，该股自4月中旬以来持续走低，近一个月股价近乎腰斩。消息上，当地时间5月14日，美国司法部正在对美国联合健康集团展开刑事调查，案件可能涉及医疗保险欺诈。就在几个月前，该集团旗下联合健康保险公司首席执行官汤普森在纽约街头被路易吉·曼吉奥内枪杀。

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