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7. Jan Koum – Net Worth $8.6 Billion

Ukrainian Jan Koum was sweeping floors to make ends meet when he and his mother first immigrated to America. After several years working for Yahoo, though, Koum left and began WhatsApp, now the world’s largest messaging service. WhatsApp was sold to Facebook for $19 billion. Koum has since donated more than half a billion dollars to the Silicon Valley Community Foundation.

Whatsapp Ceo Jan Koum
catwalker / shutterstock.com

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