You bought puts. They expired. You forgot to sell. Now you’ve been exercised. What does that actually mean—and what does it look like in your account?
Let’s break it down.
The Setup: Long Puts at Expiration
When you buy a put option, you’re purchasing the right to sell 100 shares of the underlying stock at a specific strike price. If the stock closes below that strike price at expiration, your puts are in the money (ITM).
If you don’t close or sell the puts before expiration, and they’re in the money—even by a penny—your broker will typically automatically exercise them.
What “Being Exercised” Means
Being exercised means you’ve triggered the right embedded in the put: → You sold 100 shares per contract at the strike price.
Now, depending on whether you actually owned the shares, two things can happen:
If You Owned the Shares:
- You sold them at the strike price.
- You’re flat—no position remains.
- You may see a realized gain or loss depending on your cost basis.
If You Didn’t Own the Shares:
- You’re now short the stock.
- You owe 100 shares per contract to the market.
- You’ll see a short position in your account and may need margin.
Financial Impact
- You realized the value of the put by selling at the strike price.
- If the stock was trading far below the strike, you locked in a solid gain.
- If you’re now short, you’ll need to monitor margin requirements and decide whether to cover or hold.
Example Walkthrough
Let’s say you bought 1 put contract for ABC with a $50 strike. At expiration, ABC is trading at $45. You forgot to sell.
→ You’re exercised. → You sell 100 shares of ABC at $50. → If you didn’t own those shares, you now have a short position in XYZ.
What to Check in Your Account
- Trade confirmations: Look for a sale at the strike price.
- Positions: See if you’re short the stock.
- Cash balance: You may see proceeds from the sale.
- Margin: If short, check your margin requirements.
What to Do Next
- Decide whether to cover the short or hold.
- Review your broker’s auto-exercise policy—some exercise even for tiny intrinsic value.
- Consider setting reminders or alerts for future expirations.
Final Thought
Being exercised isn’t a penalty—it’s the natural outcome of holding in-the-money puts to expiration. But if you weren’t expecting it, it can feel like a surprise. Treat it as a lesson in trade management and expiration discipline.
