European Exercise

European exercise is a rule attached to certain options contracts that says the option can only be exercised — meaning the holder can only actually buy or sell the underlying asset at the strike price — on the expiration date itself, not before. This is different from an option's price or value, which still moves every day; European exercise only restricts *when* the right can be used.

The name has nothing to do with geography. It's just a label the options industry uses to distinguish this style from "American exercise," where the holder can exercise on any business day up to and including expiration. Both styles trade in markets worldwide; a trader in the US can hold a European-style option and one in Europe can hold an American-style one.

Because a European-style option can't be exercised early, the person who sold (wrote) it never faces early assignment — they won't wake up to find the position closed out mid-life because the buyer decided to exercise. That certainty matters for anyone who has structured a hedge or a spread around that option and is counting on it staying in place until expiration.

The nuance that trips people up: even though you can't *exercise* a European option early, you can almost always still *close* your position early by selling it back in the market if it's liquid, since that's just a trade, not an exercise. People confuse "can't exercise early" with "can't get out early," which isn't the same thing. Many index options (as opposed to options on individual stocks) use European exercise, while most US equity options use American exercise — but which style applies is set by the contract, not by where you place the trade, so it should always be checked rather than assumed.