Buffett declined to answer whether he is buying more. : Billionaire investor Warren Buffett told CNBC on Wednesday he's never sold a share of Apple stock. "I've never sold a share," the chairman and CEO of Berkshire Hathaway said on "Squawk Alley." Buffett declined to answer whether he's buying even more, but said, "I certainly was buying last quarter and I don't pay attention to the calendar when I'm buying." When Berkshire first made an investment in Apple in 2016 a fellow at Berkshire bought about 10 million shares, Buffett said.