Barron’s estimates that Berkshire could owe more than $20 billion of taxes on the sales of Apple stock, which likely accounted for nearly all of the $97 billion of taxable gains

The conglomerate’s cash pile tops $300 billion for the first time.

When you think of artificial intelligence (AI) stocks, you may not automatically think of Warren Buffett. The Oracle of Omaha, as he's often called, has made a fortune through investing in the stock market, but his choices generally aren't tech stocks or companies focused on a newish or up-and-coming field.