Buffett pledged 10 million Class B Berkshire shares to the Seattle-based charity in 2006 and gives 5 percent of the remaining total each year. The shares were split 50-1 in 2010.

His gift last year was 21.7 million shares to the five groups, which include his three children’s philanthropies and the Susan Thompson Buffett Foundation, which is named after the billionaire’s first wife, who died in 2004.

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