Yes, you can. I did precisely this. I even had to take out a personal loan to cover some of the costs, as the value was just starting to ramp leading to the IPO.
In the end, I paid hundreds of dollars (or perhaps a thousand?) in interest, but it paid off handsomely as the spread between short term and long term capital gains is large enough to make it worthwhile.
Exactly. Imagine you were talking with a very early-stage company (say, to be employee number < 10), with a ~1% grant, at current dilution.
It would be so profoundly painful, financially — and in so many different ways at once — to exercise at any other time but immediately upon hire (or at a minimum, in advance of any subsequent liquidity event), in that circumstance.
> It is a common misconception, but a Section 83(b) election generally cannot be made with respect to the receipt of a private company stock option. You must exercise the option first and acquire the stock before you can make a Section 83(b) election, and you would only make a Section 83(b) election in that instance if you exercised the option and acquired unvested stock (if the stock acquired on exercise of the stock option was vested, there would be no reason to make a Section 83(b) election).