He reached out to WhatsApp billionaire Jan Koum, and together they are now steering Newlands—a rapidly growing firm that has ...

WhatsApp cofounder Jan Koum, whose company was acquired by Facebook in 2014, just sold another $203 million (£153 million) of Facebook stock, according to a document filed with the Securities and ...

Few people have benefited from Facebook's incredible success more than WhatsApp cofounder Jan Koum. With an estimated fortune of roughly $9.5 billion, 41-year-old Koum has come a long way from ...

Billionaire Californian Jan Koum gives to Chabad, pro-Israel causes and Jewish relief efforts in his native Ukraine. Meanwhile, WhatsApp’s inventor, a Ukrainian-born Jew whose creation made him ...