The stock market is rallying as AI spending and Trump tariff news turn positive. Warren Buffett will step down as Berkshire Hathaway CEO at year-end.

Operating in an era replete with purported Wall Street soothsayers, the 94-year-old Buffett always rejected the idea that anyone — even him — could predict the future.

Warren Buffett has shocked an arena full of his shareholders by announcing that he wants to retire at the end of the year.