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The 2015 Philanthropy 50

America’s 50 most generous donors increased their giving by 33 percent last year—powered in large part by a $1.9-billion gift from Bill and Melinda Gates and a stunning rise in the number of tech entrepreneurs under 40, three of whom gave more than $500-million each.

The increase is striking compared with 2012, when giving by the Philanthropy 50 rose just 4 percent.