Jan Koum, who controls a multi-billion-dollar charitable ... a major Chabad rabbi who leads Russia’s Jewish community, as a director. Koum has also given to several Chabad congregations in ...

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 ...

In America's richest town, it's go big or go home. According to a report by Variety, Jan Koum, the billionaire cofounder of WhatsApp, has spent almost $80 million buying and constructing what just ...