Core Insights - Warren Buffett has retired as CEO of Berkshire Hathaway at age 95, after a 60-year tenure, but remains as Chairman [1] - New CEO Greg Abel has taken over day-to-day responsibilities, raising questions about potential changes in the company's investment philosophy [2] Investment in American Express - Berkshire Hathaway holds a 22% stake in American Express, valued at $58.1 billion, which constitutes about 18% of its $316 billion investment portfolio [3] - American Express has been a significant investment for Buffett since 1964, when he invested $13 million at a share price of $30, resulting in a 124% return in two years [4] Stock Performance - American Express shares have increased by 27% over the past year, outperforming competitors Mastercard and Visa, which rose by 13%, and the S&P 500, which gained 17% [5] - The price-to-earnings (P/E) ratio for American Express is 25.7, lower than Mastercard's 36 and Visa's 31, indicating a more attractive valuation for investors [6] Dividend Information - American Express pays an annual dividend of $3.28, with quarterly payments of $0.82 per share, resulting in a dividend yield of 0.87% [7] - The company's dividend has shown notable growth over the last three years [7]