Buffett has sung Cook's praise in the past, too. In his 2021 letter to Berkshire shareholders, he wrote, "Tim Cook, Apple's brilliant CEO, quite properly regards users of Apple products as his first love, but all of his other constituencies benefit from Tim's managerial touch as well."

Buffett is known for his long-term investment philosophies and willingness to hold winning stocks, even if they become significant portions of his portfolio. Just four winning stocks make up 57% of Berkshire Hathaway's $277 billion stock portfolio. Here they are, and why they are still excellent buy-and-hold candidates for any long-term investor.

He has arguably the toughest act in Corporate America—following Warren Buffett. But now that Greg Abel officially has a timetable to take over Berkshire Hathaway by year-end, the question is: How will he run it?