Cashless exercise is the option-exercise method where the holder simultaneously exercises options and sells enough resulting shares to cover the strike price and tax withholding. It lets the holder convert vested options into net shares (or net cash) without putting up cash for the exercise, typically requiring a public market or a contemporaneous private secondary, making it standard at public companies but rare at private startups absent a tender offer. It is the practical solution to the cash-binding problem of traditional exercise at companies where the strike-price outlay would otherwise be substantial.
The two main cashless exercise variants: