# Exercise, assignment, early exercise, pin risk (Options 101, lesson 9 of 10)

Canonical URL: https://mrkts.gg/learn/options/assignment
Last updated: Nov 9, 2026, 9:00 AM ET

> What exercise and assignment do to your account, the automatic-exercise rule, early exercise before dividends, and pin risk at expiration.

What you'll be able to do: Explain what exercise and assignment do to your position, the automatic-exercise rule at expiration, when early exercise tends to happen, and pin risk.

## Exercise and assignment

Exercise is the buyer using the right. Assignment is the seller being told to deliver.

| Exercise (the buyer) | Assignment (the seller) |
| --- | --- |
| A call holder buys 100 shares at the strike | A call seller must sell 100 shares at the strike |
| A put holder sells 100 shares at the strike | A put seller must buy 100 shares at the strike |

## What happens at expiration

1. You hold a long 40 call. The stock closes at 42.
2. It's $0.01 or more in the money, so it's exercised automatically unless you say no.
3. On Monday you hold 100 shares, bought at $40, a $4,000 charge.
4. An option that closes out of the money, like a 40 call with the stock at 38, is not exercised. It expires worthless.

> **Watch out:** Common mistake: assuming an in-the-money option just expires or gets sold for you. Brokers have their own policies, so check yours.

## Early exercise

US stock options can be exercised any business day, so a short option can be assigned early. The classic case is a call just before an ex-dividend date. The holder exercises to get the dividend when it beats the call's remaining extrinsic value.

| Sell the call | Exercise the call |
| --- | --- |
| With the stock at 60 and a 50 call at 10.60: you get 10.60 | You get 10.00 of value |
| Keeps the 0.60 of extrinsic value | Gives it up |

> **Key idea:** Selling usually beats exercising, because exercising gives up extrinsic value.

## Pin risk

Pin risk is the uncertainty when the stock closes right at your short strike. Walk through it with the 50/55 bull call spread, with the stock closing at 55.00.

1. The stock closes at 55.00, exactly at the strike of your short 55 call.
2. Your long 50 call is 5.00 in the money, so it is exercised automatically. You are set to buy 100 shares at $50.
3. Your short 55 call has no value at 55.00, so the holder may or may not exercise it. The choice is theirs.
4. If it is assigned, you sell 100 shares at $55 and the shares net to zero. If it isn't, you keep the 100 shares you bought at $50.
5. You won't know which until after the close, and after-hours news can move the stock before Monday.

> **Tip:** Many traders close or roll short legs before expiration instead of waiting to see. A close just over the strike, like 55.02, leaves the same doubt.

## If your short leg is assigned

1. You hold a 50/55 bull call spread and the short 55 call is assigned early.
2. You're now short 100 shares, and you still hold the long 50 call.
3. You can exercise the 50 call to buy 100 at $50 and cover. The loss stays bounded.

> **Watch out:** A spread doesn't break when one leg is assigned. You still hold the long leg. Watch for the dividend owed on the short shares, borrow costs and margin.

## Worked example: A 50/55 bull call spread held to the close

*Illustrative numbers, not real quotes.*

You hold the 50/55 bull call spread from Module 7, bought for a 1.42 debit, through the 4:00 PM close. Here is what happens to the shares in your account:

| Stock at the close | Long 50 call | Short 55 call | Shares in your account Monday |
| --- | --- | --- | --- |
| 48 | Expires | Expires | 0 (you lose the $142 debit) |
| 52 | Auto-exercised | Expires | +100, bought at $50 |
| 55.02 | Auto-exercised | Probably assigned, not certain (pin risk) | 0 if assigned, +100 if not |
| 57 | Auto-exercised | Assigned | 0 |

- Stock at 57: you buy 100 at $50 and sell 100 at $55. That is +$500 from the legs, minus the 1.42 debit = +$358, the max gain. Selling the spread at 5.00 before the close gives the same result.
- Stock at 54.90 at the close, then it drops after hours: the long 50 call is exercised, and the short 55 call is out of the money, so it is likely not assigned. You now own 100 shares ($5,000) over the weekend. If that is more than your account can hold, the broker may step in.
- This is why people close or roll spreads before expiration.

## Practice

The page has 6 practice questions and 5 mastery checks for this lesson, with feedback on each wrong answer: https://mrkts.gg/learn/options/assignment

Next lesson: [Planning around events with the mrkts.gg calendar](https://mrkts.gg/learn/options/event-planning.md)

Education only, not investment advice. Example numbers are illustrative, not real quotes.

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