Warren Buffett is set to retire as CEO of Berkshire Hathaway on New Year's Eve, handing leadership to Greg Abel, with Howard Buffett expected to become chairman. The transition marks the end of a significant investment career. Concurrently, the 'Buffett Indicator,' a stock market valuation metric comparing the total stock market to US GDP, has reached a record high, prompting investor attention regarding its implications for the 2026 stock market outlook.