Core Insights - Warren Buffett's Berkshire Hathaway has acquired over 5 million shares of UnitedHealth, valued at $1.6 billion as of June [1][2] - The investment is significant as it may be one of Buffett's last major decisions before retirement at the end of the year [2] - UnitedHealth's stock experienced a dramatic decline from approximately $600 in mid-April to around $310 by the end of June, suggesting it may have been oversold [3] Berkshire Hathaway's Portfolio Adjustments - Berkshire reduced its stake in Apple by 7%, now holding 280 million shares worth $57 billion, having sold over two-thirds of its position since early 2024 [4] - New investments were made in homebuilders DR Horton and Lennar, as well as steel producer Nucor, after receiving regulatory approval [5] - Additional new positions include Lamar Advertising and Allegion, while stakes in Chevron, Constellation Brands, and Domino's Pizza were increased [9] Stock Sales and Cash Accumulation - Berkshire sold a net $3 billion in stocks last quarter, buying $3.9 billion worth but selling $6.9 billion, marking 11 consecutive quarters as a net seller [10] - The stock sales have contributed to an increase in Berkshire's cash reserves to $344 billion, surpassing the market capitalization of Coca-Cola [11] - Buffett has faced challenges in finding attractive investment opportunities due to high valuations in both public and private markets [11]