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.

Warren Buffett praised Apple CEO Tim Cook as a worthy successor to cofounder Steve Jobs after paring most of his investment in the tech giant.