Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) needs little introduction. You likely know that this company has been one of the best investments of all time, fueled by the investing prowess of its founder,

Berkshire Hathaway’s $266 billion very concentrated 40 stock portfolio added two new stocks. Warren Buffett was a net seller of stocks for the eight quarters straight.

Don’t expect any big new equity holdings when Warren Buffett’s Berkshire Hathaway reports its U.S. stock positions later Thursday.

That might explain why the Bill & Melinda Gates Foundation has Berkshire as its second biggest holding, behind only Microsoft. As of the latest reporting period, the foundation owns 24.6 million shares of Berkshire worth around $10 billion, making up 21% of its total portfolio.