SpaceX has officially filed for an IPO, planning to issue Class A and Class B common stock. Musk currently holds 12.3% of Class A shares and 93.6% of Class B shares, giving him a total of 85.1% voting power. Basically, Musk has the final say in the company. After going public, Musk's net worth will surpass $1 trillion, more than the combined wealth of the top six richest people in the U.S. and crushing the combined assets of China's top 20 billionaires.