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What happens at option expiration?
At expiration, an option that's in the money by one cent or more is exercised automatically. An option that's out of the money expires worthless and disappears. For a seller, the first means assignment and the second means you keep the premium and move on.
The short answer
Two things can happen, and the dividing line is a single cent.
- In the money by $0.01 or more: the option is exercised automatically. A short call means your shares are sold at the strike. A short put means you buy shares at the strike.
- Out of the money, or exactly at the strike: the option expires worthless. It vanishes from your account and the premium you collected is fully yours.
That's the rule the options clearing house uses in the US. Brokers follow it. You don't have to do anything for either outcome to happen.
The one-cent rule
The Expiration date for most stock options is a Friday. After the close, the clearing house looks at the official closing price. If a call's strike is below that price by a cent or more, it's exercised. If a put's strike is above it by a cent or more, it's exercised.
So a $55 call with the stock at $55.01 gets exercised. At $55.00 it doesn't. That matters when the stock closes right on top of the strike, which has its own page: options expired in the money by a penny.
The buyer can also override the rule. They can choose to exercise an option that's slightly out of the money, or not exercise one that's in. It's rare, but it's why the stock's move after the close on Friday still matters. See what if I don't close my option before expiry?
What each outcome looks like for a seller
| Your position | Stock vs strike at close | What happens | What lands in your account |
|---|---|---|---|
| Short call (covered) | Above strike by ≥ $0.01 | Assigned | Shares gone, cash in at the strike |
| Short call (covered) | At or below strike | Expires worthless | Nothing changes; option disappears |
| Short put (cash-secured) | Below strike by ≥ $0.01 | Assigned | 100 shares in, set-aside cash out |
| Short put (cash-secured) | At or above strike | Expires worthless | Cash unlocks; option disappears |
The shares or cash usually show up over the weekend or by Monday morning. Here's how to know if you got assigned.
A worked example (an illustration, not a trade idea)
You sold a 30-day $45 put on a made-up stock, XYZ, for $1.00 while it traded at $50. You collected $100 and your broker set aside $4,500. It's expiration Friday.
| XYZ closing price | In the money? | What happens | Shares | Premium | Total |
|---|---|---|---|---|---|
| $48.00 | No | Expires worthless | — | +$100 | +$100 |
| $45.00 | No (at the strike) | Expires worthless, usually | — | +$100 | +$100 |
| $44.99 | Yes, by a cent | Assigned: buy 100 at $45 | −$1 | +$100 | +$99 |
| $43.00 | Yes | Assigned: buy 100 at $45 | −$200 | +$100 | −$100 |
| $36.00 | Yes | Assigned: buy 100 at $45 | −$900 | +$100 | −$800 |
At $36 the put is exercised just like at $44.99. The cent rule only decides whether you're assigned. The stock's distance below the strike decides how much it hurts. At $36 you now own 100 shares with a paper loss of $800, and the next step in the wheel strategy is deciding whether you still want them.
Expiration doesn't settle the trade. It only settles the option. The shares you're left with still have to be dealt with.
What expiration does not do
- It doesn't give you a choice. Assignment happens with no click from you.
- It doesn't happen at 4:00 p.m. sharp. The closing price is official a little later, and buyers have a window to send instructions.
- It doesn't close your share position. Being called away ends the shares; being assigned a put starts them.
- It doesn't refund anything. The premium was yours the day you sold. Expiring worthless just means no one takes anything back.
Some index options settle in cash instead of shares, and some expire on days other than Friday. For stock options, what's above is the normal case. See how often covered calls get assigned for what to expect over many expirations.
Questions
Do I have to do anything at expiration as a seller?
No. In-the-money options are exercised automatically and out-of-the-money ones disappear. The only choice you have is to close the option yourself before the market closes on Friday.
What time do options expire?
Most stock options stop trading at 4:00 p.m. Eastern on their expiration Friday. Exercise is decided on the official closing price after that, with a short window for buyers to send instructions.
What if the stock closes exactly at the strike?
Then the option is not in the money by a cent and is not exercised automatically. The buyer can still choose to exercise it, so a small chance of assignment remains.
Does an option that expires worthless cost me anything?
No. You keep the full premium. Some brokers charge a fee for assignment or exercise, but not for an option that simply expires.
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