Warren Buffett is set to retire as CEO of Berkshire Hathaway on December 31, concluding a six-decade tenure. Vice-chairman Gregory Abel will assume operational control, while Buffett remains chairman. Under Buffett's leadership, Berkshire Hathaway grew into one of America's most valuable companies, known for its investment strategy and diverse holdings. Investors are now focused on the company's future direction and leadership under Abel, who has extensive experience managing Berkshire's non-insurance businesses.