Warren Buffett continues to make good on his promise to give most of his enormous wealth to charity.
The billionaire investor gave away $2.9 billion worth of stock in his holding company Berkshire Hathaway (, according to an official filing Thursday. He's now made a huge donation 11 years in a row. )
This year, Buffett is giving 19.6 million Class B shares to five charities. The bulk of the money, $2.2 billion, will go to the Bill and Melinda Gates Foundation.
Four other charities with links to the Buffett family will share the rest: Buffett's education-focused charity, which is named after his late wife Susan; the Nebraska-based Sherwood Foundation, chaired by their daughter; the Howard G. Buffett Foundation chaired by his son; and the NoVo Foundation, headed by Buffett's youngest son Peter.
Buffett has been giving away his wealth for over a decade now. He gave the five foundations $2.8 billion worth of shares in 2015, following a gift of a similar size the year before that.
The pledge isn't a legally binding contract, but more of a moral commitment. So far, 154 individuals and couples have joined the pledge.
-- Jackie Wattles contributed to this article