When do options expire?
Standard monthly options expire on the third Friday of the month. Weekly options, often called weeklys, expire on other Fridays, and many popular ETFs and indexes now list expirations on every weekday, which is where zero days to expiration (0DTE) trading comes from. When an expiration Friday is a market holiday, expiration generally moves to the preceding business day.
Expiring equity and ETF options generally stop trading at the 4 p.m. Eastern close on expiration day. Holders still have a short window after the close to submit exercise instructions: the industry deadline is 5:30 p.m. Eastern, and many brokers set earlier cutoffs. That gap between the close and the deadline is where much of pin risk comes from.
Expiration calendars matter for planning too. Some products also list quarterly or end of month expirations, and LEAPS are listed more than a year out, often expiring in January. Always confirm the exact expiration date in your option chain rather than assuming a particular Friday.
What happens to options at expiration?
The Options Clearing Corporation (OCC) uses a process called exercise by exception. Equity options that finish at least one cent in the money are exercised automatically unless the holder submits contrary instructions, and options that are at or out of the money expire worthless unless the holder chooses to exercise. Here is what that means for each type of position:
- A long call in the money becomes 100 shares bought at the strike per contract.
- A long put in the money becomes 100 shares sold at the strike per contract, which creates a short stock position if you did not own the shares.
- A short call in the money is assigned, so you deliver 100 shares per contract at the strike.
- A short put in the money is assigned, so you buy 100 shares per contract at the strike.
- A cash settled index option in the money pays or charges the in the money amount times the multiplier, with no shares involved.
- An out of the money option simply disappears from the account.
How does settlement work for stock and index options?
Stock and ETF options are physically settled. Exercise and assignment at expiration create stock trades that settle on the next business day, so on Monday you can wake up owning or short shares you did not hold on Friday. Your broker may require margin for that position, and if you lack the buying power it may close the position for you.
Broad index options such as SPX are cash settled, and their timing differs. Standard monthly SPX options are AM settled: they stop trading on Thursday, and the settlement value is calculated from the opening prices of the index components on expiration Friday morning, which can differ sharply from Thursday's close. SPX weeklys and daily expirations are PM settled, based on the closing value. Knowing which one you hold tells you exactly when your risk ends.
Assignment can also arrive earlier on expiration day itself, because American style options can be exercised at any time before the deadline. Most expiration assignments, however, come from the automatic process after the close.
What is pin risk?
Pin risk is the uncertainty you face when the stock closes at or very near the strike of a short option at expiration. If it closes a few cents in the money, you will probably be assigned. If it closes a few cents out of the money, you probably will not. Near the strike, you simply do not know until the assignment notices arrive.
The uncertainty runs both ways. Holders can still decide whether to exercise until the deadline after the close, so news after 4 p.m. can lead them to exercise an option that closed slightly out of the money, or to abandon one that closed slightly in the money. For a spread, the worst outcome is having the short leg assigned while the long leg expires worthless, which leaves you with an unhedged stock position over the weekend and exposed to any gap at Monday's open.
Pin risk matters most for positions whose short strikes sit right at the money at expiration, such as an iron butterfly or a short straddle, and for any vertical spread or iron condor when the stock closes near a short strike.
Pin risk is sometimes linked to the idea that stocks with heavy open interest gravitate toward large strikes into expiration as market makers hedge. That effect is debated and should not be relied on, but it explains why a stock can seem to hover near a strike on expiration Friday.
How do you manage pin risk before expiration?
Most traders avoid pin risk rather than manage it after the fact. Common practices include:
- Close or roll short options that are near the money before the close on expiration day, even if they look likely to expire worthless.
- Buy back cheap short options for a small amount instead of holding them into the final hour.
- If you hold a long option that is barely in or out of the money, decide in advance whether you want it exercised and tell your broker before the cutoff.
- Make sure you have the buying power to carry any stock position that assignment could create.
- Use European style, cash settled index options when you want to avoid share delivery entirely.
What should you review before expiration day?
A short review the day before expiration prevents most surprises. Go through every position that expires and note where each strike sits relative to the stock:
- Which long options are in the money and will be exercised automatically, and whether you want that.
- Which short options are in the money or close to it, and whether you would rather close them than risk assignment.
- Whether any position is a spread that could be split apart by assignment on one leg.
- Whether any short call faces an ex dividend date before expiration, which raises the chance of early assignment.
- How much buying power you would need if every in the money option became stock.
How do gamma and theta behave in expiration week?
In the final days, gamma for at the money options becomes very large, so delta can swing from near 0 to near 1, or the reverse, on small moves in the stock. Theta is also at its largest for at the money options, because the remaining time value has to reach zero by the close. Short options earn that decay quickly but carry large negative gamma, so a single move can erase days of income.
On the CalcOptions payoff chart, the expiration line shows exactly where each strike leaves you, and the current value curve converges toward it as expiration approaches. Watching the two lines meet makes the shift from time value to pure intrinsic value easy to see, and it shows which prices would put you in pin risk territory.
Frequently asked questions
Do I have to close my options before expiration?
No, you do not have to close options before expiration, but it is often wise. In the money options are exercised or assigned automatically, which creates stock positions, and short options near the strike carry pin risk. Closing ahead of time lets you control the outcome and avoid surprise positions.
What happens if my option expires in the money and I cannot afford the shares?
The option is still exercised automatically if it is at least one cent in the money, unless you instruct your broker not to exercise. If the resulting stock position exceeds your buying power, your broker may issue a margin call or liquidate the position. Many brokers close such positions before expiration to prevent this.
Can an option that closes out of the money still be exercised?
Yes, the holder can choose to exercise an out of the money option before the exercise deadline, for example when news after the close moves the stock. This is one source of pin risk for option sellers. It is uncommon, but you cannot rule it out when the stock closes near the strike.
Try it in a calculator
Iron Butterfly
An iron butterfly is a neutral, defined risk credit strategy that sells an at the money put and call and buys an out of the money put and call as protective wings.
Short Straddle
A short straddle is the sale of a call and a put at the same strike and expiration, usually at the money.
Iron Condor
An iron condor is a neutral, defined risk credit strategy that sells an out of the money put spread and an out of the money call spread on the same stock and expiration.
Educational tool, not financial advice. Calculations are theoretical and depend on your inputs; real fills, fees, early assignment and dividends can change results. Options involve risk and are not suitable for every investor.