As Warren Buffett retires as Berkshire Hathaway CEO after a six-decade career, attention is drawn to the 'Buffett Indicator,' a market valuation tool. This indicator, which compares the total value of U.S.-listed companies to the nation's GDP, has reached a record high near 221 as of December 30, 2025. This suggests the market is significantly overvalued, potentially signaling a risk of weaker future returns, with estimates indicating a possible annual return of around -0.5%.