The stock went to Bill and Melinda Gates Foundation, as well as four foundation with ties to the Buffett family: Buffett education-focus charity, which is named after his late wife Susan; the Sherwood Foundation, which is chaired by their daughter; the Howard G. Buffett Foundation; which is led by his son; and the NoVo Foundation, which has Buffett's youngest son Peter at the helm.
Back in 2006, Buffett announced plan to gradually donate all his Berkshire Hathaway shares and in 2010, Buffett launched The Giving Pledge with Bill Gates. The initiative encourages the world's Billionaires to dedicate the majority of their wealth to philanthropic causes. As of May, 170 people has signed the pledge across 21 countries.