What is expiration risk?

Expiration risk is the collection of risks that arise specifically from holding options positions close to or through their expiration date. While options expirations are routine events for experienced traders, they contain several distinct risks that beginners frequently encounter , often at significant cost.

The main expiration risks

1. Assignment risk If you hold short options that are ITM at expiration, you'll be assigned. This means:

• Short call assigned: you must sell 100 shares at the strike price
• Short put assigned: you must buy 100 shares at the strike price

If you don't own the shares for a short call (naked call), your broker will buy shares in the open market at the current price , potentially at a significant loss. If you're assigned on a short put and don't have the cash, you'll receive a margin call.

Solution: Close or roll short options that are ITM before the expiration close.

2. Pin risk When the stock closes exactly at or very near your short strike at expiration, you face uncertainty about assignment. The stock might close at $199.99 (just under your $200 short call , no assignment) or $200.01 (just over , you're assigned). In the final minutes of trading, the stock can fluctuate across your strike multiple times.

Holding through this uncertainty is unnecessary risk. Close positions with strikes near the current stock price before 3pm on expiration Friday.

3. After-hours assignment risk Options holders have until approximately 5:30pm EST on expiration day to submit exercise instructions , 90 minutes after the market closes at 4pm. If news breaks after hours that moves the stock significantly, long option holders can still choose to exercise options that were OTM at the 4pm close.

Example: You're short the $100 call. Stock closes at $99.50 , your call looks OTM and safe. At 4:30pm, the company announces an acquisition and the stock jumps to $106 in after-hours trading. The long holder exercises their $100 call (now $6 ITM). You're assigned , forced to deliver shares at $100 despite the stock being at $106.

This after-hours window is why it's safer to close short options before the close rather than relying on their being OTM at 4pm.

4. Theta cliff in the final day On expiration day itself, all remaining time value collapses to zero by 4pm. An option worth $0.50 at market open will be worth approximately $0.00 by close , if OTM. This creates extremely volatile intraday pricing for near-the-money options and makes precise timing critical for anyone buying 0DTE options.

5. Exercise by exception Most brokers automatically exercise any option that's ITM by $0.01 or more at expiration (called "exercise by exception"). This is designed to protect holders from losing intrinsic value due to forgetting to exercise. But it also means that even deeply hedged positions can result in unexpected stock transactions if your short option expires by $0.01 ITM.

How to eliminate most expiration risk

The simplest and most effective way to avoid expiration risk:

Close all short options before 3pm on expiration day. Pay the small cost to close , the certainty is worth far more than the few dollars of remaining time value. This eliminates pin risk, after-hours assignment risk, and exercise-by-exception surprises.

For positions that are comfortably OTM (stock more than 2–3% from your strike with no intraday momentum threatening it), you can let them expire worthless if bid-ask spreads make closing expensive. But for any strike within 1–2% of the current price: close it.

Related terms: Assignment, pin risk, OPEX, theta, 0DTE, expiration date, exercise

Try it on Stryke: Monitor your positions and expiration dates in the Portfolio tracker.

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