Group 1: Berkshire Hathaway's 13F Filing - Berkshire Hathaway's quarterly 13F filing revealed a significant new purchase of UnitedHealth Group, with 5,039,564 shares acquired, valued at approximately $1.6 billion at the end of June [12] - The 13F filing is a required disclosure for institutional investors with over $100 million in assets, providing insights into their stock transactions [2] - Warren Buffett's investment strategy often involves buying stocks under "confidential treatment," allowing him to accumulate shares without immediate market impact [6][7] Group 2: UnitedHealth Group Overview - UnitedHealth Group operates primarily in health insurance, with a substantial portion of its business dedicated to this sector [15] - The company also has a rapidly growing healthcare services segment, Optum, which enhances its profitability through various healthcare services [17] - UnitedHealth's stock experienced a significant decline of over 54% since mid-April, attributed to unexpected higher costs in its Medicare Advantage segment [18][19] Group 3: Investment Rationale - The current forward price-to-earnings (P/E) ratio of UnitedHealth Group is 14, representing a 26% discount compared to its average over the past five years, indicating potential value [21] - The company has a strong capital-return program, including a growing dividend and share buybacks, making it attractive for value-oriented investors like Buffett [21] - Despite the recent challenges, UnitedHealth has a history of navigating difficult environments, suggesting resilience and potential for recovery [20]