Buffett's contributions to Gates' foundation from 2006 through 2022 total $45 billion, when taking into account the appreciation of the Berkshire stock over time.
Berkshire Hathaway Chairman and CEO Warren Buffett, right, speaks to Bill Gates, Microsoft co-founder, as they appear to speak on the Fox Business Network with Liz Claman, in Omaha, Neb., on May 8, 2017.
Nati Harnik/AP"I believe this is the largest gift ever given, and thinking about it fills me with awe and gratitude and a sense of responsibility to make sure it is spent well," Gates wrote in an post on his blog, Gates Notes, in December 2022.
"Our secret weapon, which should not be secret at all, is the incredible generosity of Warren Buffett."