美国最大健康保险公司联合健康集团（UnitedHealth Group，股票代码：UNH）周一盘中大涨6.05%，扭转了近期的下跌趋势。这一反弹来之不易，因为该公司上周经历了巨大的股价波动，股价曾创下2011年以来最大单日跌幅。
本次反弹主要受到以下几个因素的推动：首先，公司高管的增持行为提振了市场信心。联合健康CEO Stephen J Hemsley于5月16日以每股288.57美元的价格增持了86,700股普通股票，总裁兼CFO John F.Rex同日也增持了17,175股。高管的增持通常被视为对公司未来发展前景看好的信号。
其次，尽管公司面临美国司法部的刑事调查，但投资者似乎正在重新评估公司的长期价值。上周五，联合健康的期权交易出现异常活跃，期权合约成交量达到123.37万张，较90日均量激增17.2倍，这可能预示着部分投资者对公司前景持乐观态度。此外，市场消息显示，著名投资者乔治·索罗斯的基金在今年第一季度将联合健康的持仓增加了一倍以上，这也可能增强了市场信心。
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