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Market Structure
Pin Risk — Options Trading Term Explained
Definition, formula, and how premium sellers use it.
By Aigars VolRadar·
The uncertainty that arises when a stock closes very near a short strike at expiration. The seller doesn't know whether the holder will exercise until after the market closes, creating an unhedgeable weekend gap.
Key takeaway
If your short strike is within $0.50 of the closing price on expiration day, close or roll. The risk of surprise Monday morning assignment is not worth the last few cents of premium.
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Why It Matters
Pin risk is the uncertainty that arises when a stock closes near your short strike at expiration. You don't know whether the option holder will exercise until after the market closes. This creates an unhedgeable weekend gap — you might wake up Monday with unexpected shares.
How It Works
At expiration, options that are $0.01 or more ITM are auto-exercised by the OCC. But between $0.01 ITM and a few cents OTM, the holder might or might not exercise. You won't know until assignment notices arrive (typically Monday morning for Friday expiration). The risk: unexpected stock exposure over the weekend.
Example
You're short the SPY $580 put. SPY closes at $579.85 — just $0.15 ITM. Auto-exercise kicks in: you're assigned 100 shares at $580. Over the weekend, news breaks and SPY gaps down $5 Monday. Your $15 of intrinsic value turned into a $500 loss before you could react.
Common Mistakes
Holding short options to expiration to squeeze out the last $0.10 of premium. The pin risk exposure on a $580 assignment ($58,000 of stock over a weekend) dwarfs the $10 in remaining premium. Close or roll when within $0.50 of the strike before expiration.
Pin Risk in VolRadar
Frequently Asked Questions
What is Pin Risk?
The uncertainty that arises when a stock closes very near a short strike at expiration. The seller doesn't know whether the holder will exercise until after the market closes, creating an unhedgeable weekend gap.
Why does Pin Risk matter for premium sellers?
If your short strike is within $0.50 of the closing price on expiration day, close or roll. The risk of surprise Monday morning assignment is not worth the last few cents of premium.
How does Pin Risk work?
At expiration, options that are $0.01 or more ITM are auto-exercised by the OCC. But between $0.01 ITM and a few cents OTM, the holder might or might not exercise. You won't know until assignment notices arrive (typically Monday morning for Friday expiration). The risk: unexpected stock exposure over the weekend.
What are common mistakes with Pin Risk?
Holding short options to expiration to squeeze out the last $0.10 of premium. The pin risk exposure on a $580 assignment ($58,000 of stock over a weekend) dwarfs the $10 in remaining premium. Close or roll when within $0.50 of the strike before expiration.
Related Terms
0DTE
Options expiring on the current trading day — zero days to expiration.
Backwardation
When near-term VIX exceeds longer-term VIX (VIX/VIX3M ratio above 1.0).
Block Trade
A block trade is a privately negotiated options transaction of at least 50 contracts (varies by exchange) that is executed off the public order book and then...
Charm Exposure
The aggregate delta decay across all options in a dealer hedging book.
The information about Pin Risk above is for educational purposes only and is not financial advice. Read our full investment disclaimer.
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