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If he hits the trigger in his compensation package, he gets even more Tesla stock which will vastly increase his net worth on paper.
Elon currently holds ~34 million shares of Tesla. If TSLA market cap hits a 6-month running average of $100 billion his first of 12 tranches of stock options vest, which is 1.69 million shares at $350 per share.
Musk will spend $591 million to buy the 1.69 million shares, which on the open market are worth $1.352 billion. What actually happens is he executes the options and immediately sells shares to cover the execution cost, for a net gain of ~950k shares. He then also has to sell shares to cover the taxes due at the time of exercise, which we'll under-estimate at 20% of the profit ($450 * 1.69 million * 20%) = $152 million. That's another 190,000 shares gone. Now we're down to a net gain of 760k shares on the 1.69 million.
So when the tranche vests, he will own ~2.2% more TSLA stock than he did the day prior. Best case. If tax rate is higher, which it is because California, it's probably less than a 2% bump to Elon's overall TSLA holding.
EDIT: Oh, one other thing. Any shares which are not sold to cover the strike price and the taxes due I believe must be held by Elon at least 10 years before he can sell any.
So the primary effects of hitting a tranche are 1) it generates $591 million of cash flow for Tesla, a nice equity raise. 2) it generates at least $150 million in tax revenue for We The People.