OMAHA, Neb. — In his annual letter to shareholders Saturday, Warren Buffett celebrated the successes of Berkshire Hathaway’s companies last year and in the 60 years since he took over a struggling New England textile company and began converting it into a massive conglomerate while offering some advice to President Donald Trump.

Buffett opened the letter by acknowledging that he has occasionally made mistakes over the years without offering many specific examples, but he assured shareholders that the man he has chosen to one day succeed him as CEO, Greg Abel, isn’t one of them. He wrote that Abel will be ready to act whenever he spots significant investment opportunities.