Billionaire Warren Buffett has become one of the most successful investors of all time, leading Berkshire Hathaway for 60 years. After stepping down as CEO at the end of 2025 and recently relinquishing his role as chairman, he’s officially left the top leadership ranks—though he’s staying on as a director. And despite making billions from the company, he once said buying Berkshire Hathaway was the dumbest investment he ever made.
“The dumbest stock I ever bought was—drum roll here—Berkshire Hathaway,” Buffett told CNBC’s Squawk Box back in 2010.
