# Exercise, assignment and expiration day

Exercise is the use of the right in an option by its holder, assignment is the notice that obliges a writer to fulfil the contract, and expiration day is the last day on which either can happen.

Beginner · Concept · published 29 September 2026 · last reviewed 29 September 2026
Canonical page: https://optionsbeacon.pro/learn/exercise-assignment-expiration
Learn Options > Option basics

## Key points

- Options on stocks are American-style. Their holders can exercise on any business day up to the expiration date.
- A writer is assigned when a holder exercises. The writer is chosen by the clearing system and the broker, and cannot refuse.
- At expiration an option that is in the money by $0.01 or more is exercised automatically unless its holder instructs otherwise.
- An exercise is settled in shares. 100 shares per contract change hands at the strike price.

An option ends in one of three ways: it is closed in the market, it is exercised, or it expires worthless.
Holders exercise only about 7% of options, according to the Options Industry Council. When they do, the rules
below decide who buys shares, who delivers them, and when.

## What exercising an option means

To [exercise](https://optionsbeacon.pro/learn/glossary.md#exercise) an option is to use the right it contains. The holder of a call buys 100
shares per contract at the strike price. The holder of a put sells 100 shares per contract at the strike price.

The holder gives the instruction to the broker, and the broker passes it to the Options Clearing Corporation.
Options on stocks and on exchange-traded funds are [American-style](https://optionsbeacon.pro/learn/glossary.md#american-style): the holder
can exercise on any business day until the option expires.

An exercise uses up the option. Whatever time value the option still had is lost, which is why a holder who
wants to take a gain before expiration usually sells the option.

## What assignment means for the writer of an option

For every holder who exercises, a writer of the same option is [assigned](https://optionsbeacon.pro/learn/glossary.md#assignment). The
Options Clearing Corporation assigns the exercise by a random procedure to a brokerage firm whose customers have
written that option. The firm passes it to one of those customers, usually at random or first in, first out.

The writer who is assigned must fulfil the contract. The writer of a call delivers 100 shares per contract at
the strike price, and the writer of a put buys them. Assignments are determined after the market has closed,
from the positions that are open at the end of the day. A writer who bought the option back during the day can
no longer be assigned, and a writer who was assigned can no longer buy it back.

## What happens on the expiration day of an option

Standard monthly options on stocks expire on the third Friday of the month, and weekly options in most cases on
the Friday of their week. An expiring option trades until the market closes on that day, at 4:00 p.m. Eastern
Time. After the close its fate is decided by where the stock ended.

| Where the option ends | What happens |
|---|---|
| In the money by $0.01 or more | It is exercised automatically, unless the holder has instructed the broker not to |
| At the money or out of the money | It expires worthless, unless the holder has instructed the broker to exercise it |

The procedure is known as [automatic exercise](https://optionsbeacon.pro/learn/glossary.md#automatic-exercise). Its name in the rules is
exercise by exception, and it is not automatic in the strict sense, because the holder always has the choice.
A broker may also apply a threshold of its own.

Holders have until 5:30 p.m. Eastern Time on the expiration day to give their instructions, and brokers set
earlier deadlines for their customers. A holder who does not want the shares, or does not have the money for
them, has to sell the option before the close or give the instruction in time.

## How the exercise of an option is settled

Options on stocks are settled by delivery, called
[physical settlement](https://optionsbeacon.pro/learn/glossary.md#physical-settlement). Shares and cash change hands: 100 shares per
contract against the strike price times 100. Since 28 May 2024 the delivery settles on the first business day
after the exercise.

> **Example**
>
> A holder owns two XYZ 50 calls on the expiration date, and XYZ closes at $53.20. The calls are $3.20 in the
> money and are exercised automatically. The holder buys 200 shares at $50 and pays $10,000. Two written calls
> are assigned, and their writers deliver 100 shares each and receive $5,000 each. A holder without $10,000 in
> the account would have had to sell the calls before the close, for about $3.20 per share, $640 for the two
> contracts.
>
> *Hypothetical example for illustration only. One contract covers 100 shares; commissions, fees, dividends and taxes are ignored unless stated.*

## Why an option is exercised before its expiration date

An [early exercise](https://optionsbeacon.pro/learn/glossary.md#early-exercise) gives up the time value of the option, so it makes sense
for the holder only when that time value is small against what the exercise brings.

The common case is a call in the money on the day before the stock goes
[ex-dividend](https://optionsbeacon.pro/learn/glossary.md#ex-dividend-date). The holder of a call does not receive the dividend. By
exercising on the day before, the holder owns the shares in time to receive it. It pays when the dividend is
larger than the time value that is given up.

The other case is a put deep in the money. Its holder can exercise to receive the strike price now and not
later, and professional traders usually do.

For the writer, each of these cases is an [early assignment](https://optionsbeacon.pro/learn/glossary.md#early-assignment). The writer of a
call who is assigned before the ex-dividend date delivers the shares and does not receive the dividend.

## What can go wrong at exercise, assignment and expiration

**An exercise nobody intended.** An option that ends $0.01 in the money is exercised automatically. A holder
of five calls with a strike price of $180 who forgets them on the expiration day buys 500 shares for $90,000.

**A stock that ends at the strike price.** When the stock closes at or very near the strike price, a writer
cannot know until the Monday after expiration whether the option was assigned. This is called
[pin risk](https://optionsbeacon.pro/learn/glossary.md#pin-risk). The stock can open at a different price on Monday, and the writer holds
shares, or lacks them, without having planned for it.

**A move after the close.** Holders can still give instructions until 5:30 p.m. Eastern Time. A move of the
stock in that time can lead holders to exercise options that closed out of the money, so the risk of
assignment does not end with the trading day.

**A halt in trading.** When trading in a stock is halted, trading in its options is halted too. Holders can
usually still exercise during a halt, and the writer of a put who is assigned must buy the shares whether they
trade or not.

## Questions and answers

### Can an option be assigned before it expires?

Yes. Options on stocks are American-style, so a holder can exercise on any business day and a writer can be assigned on any business day. It is most common when the option is deep in the money and has little time value left, and for calls on the day before the stock goes ex-dividend.

### What happens to an option that expires out of the money?

It expires worthless. The holder loses the premium paid, the writer keeps the premium received, and no shares change hands.

### Does the holder of an option have to exercise it to take a gain?

No. The holder can sell the option in the market at any time before it expires. Selling keeps the time value that the option still has, which an exercise gives up.

## Terms used on this page

- **Exercise**: The holder's use of the right in an option, which is buying the shares at the strike price with a call or selling them at the strike price with a put.
- **Assignment**: The notice to the writer of an option that a holder has exercised it, which obliges the writer to deliver (a call) or to buy (a put) the shares at the strike price.
- **Automatic exercise**: The common name of exercise by exception, the procedure by which the Options Clearing Corporation exercises an expiring option that is in the money by $0.01 or more unless instructions not to exercise it are given. A broker may apply a threshold of its own.
- **Early exercise**: The exercise of an American-style option before its expiration date. It gives up the time value the option still has.
- **Early assignment**: The assignment of a written option before its expiration date. It can happen on any business day for American-style options, most often when little time value is left or just before an ex-dividend date.
- **Ex-dividend date**: The first day on which a stock trades without the right to its next dividend. The holder of a call receives that dividend only by exercising before this date and owning the shares.
- **Pin risk**: The risk to the writer of an option that the stock closes at or very near the strike price at expiration. The writer then does not know until after the market has closed whether the option was assigned.
- **Physical settlement**: The settlement of an exercised option by delivery of the underlying shares against payment of the strike price. Stock options settle this way; most index options settle in cash.

## Sources

1. [Characteristics and Risks of Standardized Options](https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document), The Options Clearing Corporation (read 29 September 2026). The options disclosure document, edition of June 2024.
2. [Options Exercise](https://www.optionseducation.org/referencelibrary/faq/options-exercise), The Options Industry Council (read 29 September 2026). Frequently asked questions.
3. [Options Assignment](https://www.optionseducation.org/referencelibrary/faq/options-assignment), The Options Industry Council (read 29 September 2026). Frequently asked questions.
4. [Exercising Options](https://www.optionseducation.org/optionsoverview/exercising-options), The Options Industry Council (read 29 September 2026).
5. [June Office Hours FAQs: IV Statistics, Position Management, and the Wheel Strategy](https://www.optionseducation.org/news/june-office-hours-faqs-iv-statistics-position-management-and-the-wheel-strategy), The Options Industry Council (read 29 September 2026). Article of June 2026.
6. [Naked Put (Uncovered Put, Short Put)](https://www.optionseducation.org/strategies/all-strategies/naked-put-uncovered-put-short-put), The Options Industry Council (read 29 September 2026).
7. [Equity Options Product Specifications](https://www.cboe.com/exchange-traded-stock/equity-options-spec/), Cboe Global Markets (read 29 September 2026).
8. [The Impact of T+1 on Options](https://www.optionseducation.org/news/understanding-t-1-conversion), The Options Industry Council (read 29 September 2026). Article of July 2024.
9. [New “T+1” Settlement Cycle – What Investors Need To Know: Investor Bulletin](https://www.investor.gov/introduction-investing/general-resources/news-alerts/alerts-bulletins/investor-bulletins/new-t1-settlement-cycle-what-investors-need-know-investor-bulletin), U.S. Securities and Exchange Commission (read 29 September 2026).
10. [FINRA Rule 2360. Options](https://www.finra.org/rules-guidance/rulebooks/finra-rules/2360), Financial Industry Regulatory Authority (read 29 September 2026).

## Related topics

- [The main risks of options](https://optionsbeacon.pro/learn/risks-of-options.md)
- [Cash-secured put](https://optionsbeacon.pro/learn/cash-secured-put.md)
- [Covered call](https://optionsbeacon.pro/learn/covered-call.md)
- [How to read an option chain](https://optionsbeacon.pro/learn/how-to-read-an-option-chain.md)
- [Strike price, expiration date and premium](https://optionsbeacon.pro/learn/strike-expiration-premium.md)

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Educational content from Options Beacon. It is not investment, tax or legal advice, and not a recommendation to buy or sell any security or to use any strategy. Options involve risk and are not suitable for all investors; an option seller can lose far more than the premium received. Before trading options, read [Characteristics and Risks of Standardized Options](https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document).

Articles are drafted with AI assistance and checked against the sources listed on each page.