Berkshire used to own more than 900 million shares of Apple stock, but it now holds 280 million. Uneven business results and underwhelming momentum in AI could partially explain why Buffett's company has cut its position in Apple.

TheStreet. Warren Buffett is arguably the most successful investor of all time. He's amassed an amazingly massive net worth by buying and usually holding stocks for the long haul. Trained under legendary value fund investor Benjamin Graham,