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American vs European Options
refer to WHEN options can be exercised. American options can be exercised anytime before expiration. European options can only be exercised at expiration.
The names have nothing to do with geography. Most stock options are American-style. Most index options are European-style.
Quick answer
American = exercise anytime (most stock options). European = exercise only at expiration (most index options, SPX). American options worth slightly more due to flexibility. Early assignment possible only with American options.
American options can be exercised any time before expiration (most equity options); European options only at expiration (most cash-settled index options).
American-Style Options
American options can be exercised at any time before or at expiration.
- Most stock/ETF options (AAPL, SPY, QQQ)
- More flexibility for the buyer
- Early assignment risk for sellers
- Worth slightly more than European equivalent
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European-Style Options
European options can ONLY be exercised at expiration—not before.
- Most index options (SPX, NDX, RUT)
- No early assignment risk
- Cash-settled (no stock delivery)
- Slightly cheaper than American equivalent
Why It Matters
For Buyers
American style gives you flexibility to exercise early if advantageous (rare but possible).
For Sellers
European style eliminates early assignment risk—you know exactly when settlement happens.
Quick Comparison
| Feature | American | European |
|---|---|---|
| Exercise | Anytime | At expiration only |
| Examples | Stock options, SPY | SPX, NDX, VIX |
| Settlement | Stock delivery | Usually cash |
| Early assignment | Possible | Not possible |
Key Takeaways
- American = exercise anytime (stock options)
- European = exercise at expiration only (index options)
- Names don't relate to geography
- European eliminates early assignment risk
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