WhatsApp's cofounder could be leaving $1 billion on the table by quitting Facebook (FB)

Reuters WhatsApp cofounder Jan Koum is leaving Facebook, which acquired his company in 2014 for $19 billion. Koum is leaving before his stock award fully vests. He could be losing as much as $1 billion in Facebook stock. He's sold over $7 billion in Facebook stock so far. WhatsApp cofounder Jan Koum announced on Monday that he plans to resign from Facebook, which means he might be leaving a lot of money on the table. Depending on when Koum's last day at Facebook is, he might lose out on as much ...