Yes but not entirely. Yes in that if the CEO tries to sell 125B dollars of shares, the stock price will take a significant hit.
No in that this is paper wealth that you can borrow liquid cash against. Which makes a decent fraction of that wealth actually accessible (if you don't use this borrowing to just buy more shares.)
No in that this is paper wealth that you can borrow liquid cash against. Which makes a decent fraction of that wealth actually accessible (if you don't use this borrowing to just buy more shares.)