Berkshire Hathaway stock tumbled Monday after Warren Buffett announced he will step down as CEO at the end of 2025, according to Barron's. Class A shares closed down 4.9, while Class B dropped 5.1. The board approved Greg Abel, a longtime executive, as the incoming CEO, and Buffett will remain chairman and said he’ll serve as an advisor starting in 2026. Some investors expressed concern about the company’s long-term valuation without Buffett in charge. Berkshire missed first-quarter earnings estimates and invested little cash, disappointing investors who expected Buffett to act on the market downturn.