Warren Buffett stepped down as CEO of Berkshire Hathaway on December 31, 2025, after six decades leading the conglomerate he transformed from a struggling textile mill into a $1 trillion empire. The “Oracle of Omaha” left his successor, Greg Abel, with a very concentrated portfolio: 70% of Berkshire’s $381 billion portfolio is invested in just ... Berkshire Hathaway Sold 16 Stocks in Q1 but Warren Buffett and Greg Abel Still Have 70% in Just 7 Stocks