Warren Buffett on Monday donated about $2.84 billion of Berkshire Hathaway Inc. stock to the Bill and Melinda Gates Foundation and four family charities, as part of the billionaire's plan to give away nearly all of his wealth.
The 10th annual donation, Buffett's largest, comprised 20.64 million Class "B" shares of Berkshire, and increased Buffett's total contributions to the charities to more than $21.5 billion.
The Gates Foundation, which focuses on improving education and health and reducing poverty, received about 15.76 million shares, or 76 percent of the total donated.
Also receiving donations were the Susan Thompson Buffett Foundation, named for Buffett's late first wife, and the Howard G. Buffett, Sherwood and NoVo Foundations, respectively overseen by his children Howard, Susan and Peter.