Warren Buffett Sells Apple Stock and Buys a Brand New Stock Up 5,600% in 30 Years

Group 1: Apple Inc. - Warren Buffett's Berkshire Hathaway sold 20 million shares of Apple in the second quarter, reducing its position by approximately 70% since late 2023, while Apple remains the largest holding in the portfolio valued at $313 billion [1][2] - Apple accounted for 43% of smartphone sales in the second quarter, significantly outperforming its closest competitor Samsung, and has a strong presence in personal computers, smartwatches, and tablets, which enhances consumer loyalty and pricing power [5][6] - The company has faced challenges in innovation, particularly in artificial intelligence, with delays in the anticipated AI features and a lack of major new products since 2017, raising concerns about its high valuation at 40 times earnings [7][8] Group 2: UnitedHealth Group - Warren Buffett initiated a new position in UnitedHealth Group, a diversified healthcare company with a market cap of $331 billion, which operates through two segments: UnitedHealthcare and Optum [10][11] - UnitedHealth has faced significant challenges, including underestimating expenses by $6.5 billion in 2025, leading to an 18% decline in earnings in the first half of 2025 due to rising medical costs and utilization [12][13] - The company is under investigation by the Justice Department for potential antitrust violations and billing practices, contributing to its shares trading 42% below record highs, indicating caution for potential investors [13][14]