Warren Buffett stepped down as CEO of Berkshire Hathaway (NYSE: BRK-B) 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 highly concentrated portfolio: almost 65% of Berkshire’s $331 billion equity portfolio ... Greg Abel Channeled His Inner Warren Buffett With Legacy and Dividend Stock Buys in Q1