The past two auctions were called off due to Covid-19 concerns and Buffett has said this will be the last.
"It's been nothing but good," Buffett said of the charity lunch in a news release.
"I've met a lot of interesting people from all over the world. The one universal characteristic is that they feel the money is going to be put to very good uses."
Like the winner this year, some other past winners have chosen to remain anonymous.
One past winner, Ted Weschler, received a job offer from Buffett's company after he spent nearly $5.3 million on two auctions in 2010 and 2011.
Weschler now works as an investment manager for the Omaha, Nebraska, conglomerate, Berkshire.