Options Expiration
How expiration works and what happens on expiration day
What Is Options Expiration?
Options expiration is the date and time at which an option contract becomes invalid and ceases to exist. For standard US equity options, expiration is the third Friday of each month at 4:00 PM ET (after the equity market close). After that point the option can no longer be traded in the secondary market; its only remaining function is to be exercised or to expire worthless. Every option has a specified expiration date; March 2026 options, for example, expire on the third Friday of March. Expiration is one of the defining features of options: everything has an expiry date, unlike shares, which exist indefinitely. An option’s behaviour changes dramatically as expiration approaches, especially in the final days.
The Mechanics of Expiration and Exercise
When an option expires, one of two things happens depending on moneyness. If the option is in the money, it is generally exercised automatically. An ITM call is exercised, giving you the right to buy the asset at the strike. An ITM put is exercised, giving you the right to sell the asset at the strike. Exercise generally happens automatically; you do not need to do anything. If the option is out of the money at expiration, it simply expires worthless and disappears. The option seller keeps the entire premium as profit. If the option is exactly at the money (very rare), it generally expires worthless by default. It is important to understand that expiration is not a choice: if it is ITM, it will be exercised automatically. Exercise results in the underlying transaction being executed: for a call, buying shares; for a put, selling shares.
Accelerating Decay Near Expiration
An important feature of options is that most theta decay occurs near expiration. An option might lose only a few cents a day two weeks before expiration and lose ten or fifteen times that daily amount in the final sessions. This acceleration is dramatically more pronounced for out-of-the-money options. An OTM option might be worth $0.50 a week before expiration and $0.05 a day later. That decay is why option sellers prefer near-dated expirations. Buyers of OTM options can watch their investment evaporate quickly if the asset price does not move fast. It is why many traders set strict time limits on their trades: if the trade has not moved within a certain period, they close the position rather than let it decay to zero.
Assignment and Its Consequences
For option sellers, the most important expiration-related risk is assignment (when the buyer exercises the option). If you sold an ITM call, you can be assigned, meaning you must deliver shares at the strike, losing the chance to sell them at a higher price. If you sold an ITM put, you can be assigned, meaning you must buy shares at the strike. Assignment is entirely automatic and there is no escape once you have been assigned. That is why option sellers often close their short positions before expiration rather than waiting to be assigned. Early assignment is also possible for American options before expiration, especially for calls on dividend-paying stocks. It is important to have a plan for handling assignment if you sell options. Some traders want to keep the shares after assignment; others prefer to exit the position immediately.
Why Multiple Expiration Dates Exist
Although every month has a standard expiration (the third Friday), markets also offer weekly options (expiring each Friday) and 0DTE options (expiring the same day). Having several expirations available lets you choose exactly how long you want the option to live. A trader wanting a short-duration bet can use one-week options. A trader wanting a longer-horizon bet can use monthly or quarterly options. Longer-dated options generally carry higher premiums because they hold more time value. Shorter-dated options suit intraday trading better. Most markets also offer extended-expiry options (LEAPS) that can expire up to two years out. Choosing the right expiration is an important part of constructing an options strategy.