Buffett began buying shares in the consumer electronics giant in 2016 and continued buying, turning Apple into Berkshire Hathaway's biggest individual stock holding in 2017. Apple represented roughly 50% of Berkshire Hathaway's investment portfolio at its peak in 2023.

Apple shares were up 0.1% in early premarket trading on Friday, even after Warren Buffett's Berkshire Hathaway trimmed its stake in the iPhone maker last quarter. The storied investor sold 20 million shares of Apple in the June quarter,

Warren Buffett's Berkshire Hathaway disclosed on Thursday a new investment in UnitedHealth Group after the insurer became a target for many Americans upset over the direction of the nation's healthcare.