伯克希尔披露新持股信息后，联合健康股价创五年来最大涨幅

Group 1 - Berkshire Hathaway disclosed its substantial stake in UnitedHealth, holding 5 million shares valued at approximately $1.6 billion, leading to a 12% surge in UnitedHealth's stock price, potentially marking its best single-day gain in five years [2] - Prior to Berkshire's filing, UnitedHealth's stock had declined nearly 50%, facing scrutiny from the public regarding rising healthcare costs and an investigation by the U.S. Department of Justice into its Medicare billing practices [2] - UnitedHealth's CEO Andrew Witty announced his resignation, and the company retracted its annual profit forecast earlier this year, further impacting its stock performance [2] Group 2 - Deutsche Bank healthcare analyst George Hill noted that Berkshire's investment signifies strong confidence in UnitedHealth and may provide a short-term trading platform for the Managed Care Organization (MCO) sector, potentially indicating a market bottom and encouraging other investors to consider the sector safe for investment again [3]