Warren Buffett's annual donation to the Bill & Melinda Gates Foundation rose with the value of Berkshire Hathaway stock this year by 30% to around $1.62bn.
This is a significant increase on last year's donation, which was the smallest amount since Buffett began distributing the gift in 2006, according to the Wall Street Journal.
Four years ago, the Sage of Omaha pledged most of his fortune to the Gates Foundation, to be distributed in annual installments of Berkshire Hathaway Class B shares.
The Wall Street Journal estimates the total value of Buffett's donation, including future gifts of shares he has pledged, to be about $39bn.
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