> when you exercise, either it is because the company was just acquired (and the share is immediately sold and you pay taxes on the profit) or the company has gone public and the shares are now tradable,
Nope. I'd argue the most common case of exercising stock options is actually when you leave a company before it has had a liquidity event (and you have to exercise the options because of a 90-day exercise limit). It's also when you want the lowest possible 409A/FMV, so that your taxes are as low as possible. Because you can't sell the shares to pay taxes.
There's also the rarer case (as you said) of employees exercising options of a private company while still remaining employed there. This is done in anticipation of an IPO or similar, to get a head start on the long-term capital gains tax clock. It's still not that rare though.
Nope. I'd argue the most common case of exercising stock options is actually when you leave a company before it has had a liquidity event (and you have to exercise the options because of a 90-day exercise limit). It's also when you want the lowest possible 409A/FMV, so that your taxes are as low as possible. Because you can't sell the shares to pay taxes.
There's also the rarer case (as you said) of employees exercising options of a private company while still remaining employed there. This is done in anticipation of an IPO or similar, to get a head start on the long-term capital gains tax clock. It's still not that rare though.