WhatsApp Co-founder Jan Koum's Superyacht Docks in Varkiza, Greece

WhatsApp Billionaire Jan Koum Returns to Greek Waters on €325 Million Superyacht

The Moonrise, one of the world's most technologically advanced superyachts and the property of WhatsApp co-founder Jan Koum, dropped anchor in the Saronic Gulf off the Athens Riviera coast of Varkiza on Sunday, drawing crowds of onlookers to the shoreline. Mr. Koum, whose net worth is estimated at over $15 billion, is on his second consecutive summer cruise through Greek waters. Beachgoers along the Attica coast spotted the nearly 100-meter vessel tracking slowly along the regional mariti...

By ANTHEE CARASSAVA