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.

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.

Warren Buffett is arguably the world’s most famous investor, and his investment moves are closely followed. Each quarter, the company he runs, Berkshire Hathaway, discloses its current holdings to shareholders.