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Pin risk: when the stock closes right at your strike
Pin risk is the uncertainty you're left with when a stock closes at or within pennies of your strike on expiration day. You can't be sure whether you'll be assigned until the notices arrive. Here's what that looks like, worked out in numbers, and the simple fix.
What pin risk means
A stock is "pinned" when it closes on expiration Friday right at a popular strike. Your sold option is then a coin flip: a penny in the money and it's exercised automatically; a penny out and it usually isn't. See Pin risk.
The problem isn't the penny. The problem is that you can't plan the weekend. Will you own 100 shares on Monday, or not? Should you place a new trade? You don't know, and the market can move while you wait.
Most sellers meet pin risk once and then build a habit to avoid it. The habit is at the end of this page.
Why a penny decides it
At expiry, US stock options that finish $0.01 or more in the money are exercised automatically by the clearing house. The check uses the official closing price. So:
- Your sold $45 put, stock closes at $44.99 → in the money by a cent → you're assigned.
- Same put, stock closes at $45.01 → out of the money → usually expires.
"Usually" is doing work there. A buyer can exercise an out-of-the-money option on purpose, or tell their broker not to exercise an in-the-money one. They have until a cutoff after the close to send that instruction. Right at the strike, both happen. After-hours moves are the usual reason.
The weekend you can't plan
Say you run the wheel strategy and your put is pinned. Two futures are open at 4:01 pm Friday:
- Assigned. 100 shares arrive. Your plan says sell a covered call Monday.
- Not assigned. Cash is released. Your plan says sell a new put Monday.
You can't place either order yet. If news hits over the weekend, you're exposed either way, with no choice made.
A worked example (an illustration, not a trade idea)
A made-up stock, XYZ, trades at $48. You sell one 30-day $45 put for $1.00. You collect $100 and your broker sets aside $4,500.
On expiration Friday, XYZ drifts down all day and closes at $44.98. Two cents in the money. You think, "It's basically at the strike. I probably won't get it."
Saturday morning: the notice says assigned. You own 100 shares at $45. Your cost after the premium is $44.
Over the weekend, the company announces a bad quarter. Monday, XYZ opens at $41.
| Monday open | What you hold | Shares | Premium | Total |
|---|---|---|---|---|
| $41 (what happened) | 100 shares bought at $45 | −$400 | +$100 | −$300 |
| $44 (a quiet weekend) | 100 shares bought at $45 | −$100 | +$100 | $0 |
| $46 (good news) | 100 shares bought at $45 | +$100 | +$100 | +$200 |
The stock doesn't stop at $41. Over the next two weeks it slides to $38. A covered call above your $45 cost pays a few cents, so it doesn't help. You decide, per your rule, to sell the shares at $38.
Result: −$700 on the shares, +$100 premium = −$600. On Friday at 3:55 pm, the put could have been bought back for about $0.10, or $10. That's a math example, not a promise.
The loss came from the stock, not from the pin. But the pin took away your choice. You spent the weekend hoping instead of deciding.
The same thing on a covered call
Pin risk cuts both ways. You own XYZ at $50 and sold a $55 call. Friday it closes at $55.01.
- You're assigned. Shares gone at $55. Monday, XYZ opens at $58 on a buyout rumour. You watch it from the sidelines. Capped at the strike, which was the deal.
- Or it closes at $54.99. Not assigned. Monday it gaps to $49. You still own the shares and the call paid nothing more. −$100 on the shares, +premium.
Neither is a disaster. Both are a plan you didn't get to make.
The simple fix: don't be there at 4 pm
Most pin risk is avoided by one habit. On expiration day, if your short option is near the strike, close it before the bell.
| Where the stock is at 3:30 pm Friday | What the option is worth | What to do |
|---|---|---|
| Well away from the strike (OTM by 3%+) | Pennies | Letting it expire is common. See let it expire worthless |
| Within about 1% of the strike | A few cents to a few dimes | Buy it back. Pay the dime, know your position |
| In the money by a clear margin | Mostly intrinsic value | Decide now: take assignment, or close, or roll |
Buying back a near-the-strike option on Friday costs a little. In the example above, $10. What it buys is certainty: you know on Friday what you own on Monday.
In plain words: the premium you'd save by holding to the last minute is tiny. The weekend you can't plan is not.
Why sellers get pinned more often than you'd think
Big open interest at a strike can pull price toward it on expiry day, as traders on both sides hedge. Many traders believe popular round strikes on busy stocks close near the strike more often than chance alone would suggest. We're not going to put a number on it, because we don't have one we trust. The point is practical: round strikes on busy names are exactly where you'll meet this.
Open interest shows up on the Options chain. If your strike is the biggest number in that column, be ready for a close nearby.
What to do with this
- Add one line to your expiration-day routine: at 3:30 pm, check every short option within 1% of its strike.
- Decide today what you'd do if assigned. If you don't want the shares, close the put on Friday regardless of pennies.
- If you do want the shares, consider closing anyway and placing a limit order. At least then you choose.
Questions
What is pin risk in options?
It's the uncertainty a seller faces when the stock closes at or very near the strike on expiration day. The option may or may not be exercised, so you don't know until the notices arrive whether you'll have shares on Monday.
Will I be assigned if the stock closes exactly at the strike?
Usually not, because the option is not in the money. But a buyer can still exercise on purpose, especially if the stock moves after the close. At the strike, you can't be sure either way.
How do I avoid pin risk?
Buy the option back before the close on expiration day if the stock is near the strike. It typically costs a few cents to a few dimes per share and removes the guesswork.
Does pin risk mean I lose money?
Not by itself. The loss or gain comes from where the stock goes next. Pin risk means you're carrying that exposure over a weekend without having chosen to.
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