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10 Americans who are not only wealthy but charitable

The 10 wealthiest and most charitable Americans, based on the percentage of wealth donated last year. 

4. Jan Koum

Albert Gea/Reuters/File
WhatsApp Chief Executive Officer and co-founder Jan Koum holds up a mobile phone as he delivers a keynote speech in February, 2014.

In 2009, Jan Koum founded WhatsApp, the world's largest mobile messaging app. Ranking #60 on the Forbes 400, Mr. Koum is worth $7.5 billion. Last year he donated $560 million, or 7.5 percent of his worth, to the to set up a donor-advised fund. His fund issued a grant to , a free open-source operating system project.

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