The company is "worth" $4.3 Trillion dollars. Losing 4% of $4.3 trillion = losing $172 billion in one day.

Also, based on how everyone else did today, they probably would have made $172 billion if this story hadn't come out today, therefore it's like they lost $344 billion dollars in one day.

His buddies on the board (who own most of the company and therefore ate most of that loss) are probably pretty pissed at him right now, and also salivating at an opportunity to take some of his shares as punishment.