SEATTLE — Mark Zuckerberg and his wife, Priscilla Chan, were the most generous American philanthropists in 2013, with a donation of 18 million shares of Facebook stock, valued at more than $970 million, to a Silicon Valley nonprofit in December.
The Chronicle of Philanthropy reported Monday that Zuckerberg’s donation was the largest charitable gift on the public record in 2013 and put the young couple at the top of the magazine’s annual list of 50 most generous Americans in 2013.
The top 50 contributors made donations last year totaling $7.7 billion, plus pledges of $2.9 billion.
Some of the nation’s biggest givers do not appear on the 2013 list, not because they stopped being generous, but because their donations in 2013 were counted as pledges in previous years.
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For example, Microsoft co-founder Bill Gates and his wife, Melinda, gave their foundation slightly more than $181.3 million last year, but they were paying off a pledge of about $3.3 billion they made in 2004.
CNN-founder Ted Turner and Berkshire Hathaway chairman Warren Buffett also made large gifts toward previous pledges.
It took gifts totaling at least $37.5 million to make the list this year. Forty-two of the top 50 made gifts of $50 million or more.
Ten of the 50 made the list because of bequests after their deaths, including the second biggest giver in 2013, George Mitchell, a Galveston, Texas, man who made his fortune in energy and real estate.
At No. 3 were Nike chairman Philip Knight and his wife, Penelope, of Portland, Ore., who made a $500 million challenge grant to Oregon Health & Science University Foundation for cancer research.
No. 4 was philanthropist and former New York Mayor Michael Bloomberg, who made gifts totaling $452 million in 2013 to arts, education, environment, public health and other causes.