Options Expiration: Definitions, Checklist, & More

In an earlier era of options trading—two or three decades ago—attendance one day a month was virtually mandatory for market makers in the options trading pits of Chicago and other financial centers: options expiration day. Volume was usually heavy, and the potential for volatility was ever-present. In short, trading options on expiration day was seen as a time of opportunity and risk.

These days, however, with daily, midweek, and weekly options adding to the standard monthly and quarterly dates, options expiration happens every day of the week.

For traders new to options trading who don't quite understand all the terminology and logistics, expiration can also be a challenging or risky time. Here are a few things all traders should know if they want to avoid potential pitfalls and better understand the ins and outs of expiration day.

• Option holder/buyer. The buyer ("owner") of an American-style option has the right, but not the obligation, to exercise the option on or before expiration. A call option gives the owner the right to buy the underlying security at a specified price (the strike price—see below); a put option gives the owner the right to sell the underlying security at a specified price.
• Multiplier. When an option holder buys a put or call, they pay a premium. To arrive at the total cost of an options contract, the premium is typically multiplied by 100 (exceptions may exist with some nonstandard options contracts). This multiplier represents the number of shares in the contract. For example, if an option is trading for $1.40, the price of one contract, excluding fees, is $140, or $1.40 x 100 (multiplier).
• Expiration. Each option has an expiration date, which is when the contract expires and ceases to exist. It marks the final deadline for option holders to exercise their right to buy or sell the underlying security at a specified price. After expiration, the contract can no longer be exercised.
• Strike price. Each option also has a strike price. This is the fixed price at which an option holder can buy or sell an underlying security if the option is exercised before the contract expires.
• Moneyness. Options can either be in the money (ITM), at the money (ATM), or out of the money (OTM). An ATM option has a strike price at or near the price of the underlying security. A call option is ITM if the underlying security's price is above the strike price (opposite for puts) and OTM if the underlying security's price is below the strike price (reverse for puts).
• Option writer/seller. When a trader sells (or "writes") an American-style option (call or put), they may be assigned if the option is ITM on or before expiration day (and, in rare cases, even slightly OTM due to after-hours price movement, as described below). The option seller has no control over assignment and no certainty around timing. Assignment on a short call means the seller must deliver, or sell, the underlying shares at the strike price, while assignment on a short put means the seller must buy the underlying shares at the strike price.
• Options intrinsic value. This is the difference between a strike price and the underlying security's current price. For example, if a stock is trading for $51, a 50-strike call option has $1 of intrinsic value. If that option is trading for $1.40, the remaining $0.40 is known as extrinsic value, or time value. OTM options consist only of extrinsic value.

American-style options can be exercised any time before the options expiration date, while European-style options can only be exercised at expiration. Standard U.S. equity options (options on single-name stocks) are American-style. Most options on stock indexes, such as the Nasdaq-100^® (NDX), S&P 500^® Index (SPX), and Russell 2000^® Index (RUT), are European style.

Also, standard equity options are not cash-settled—actual shares are transferred during exercise/assignment. Options on broad-based indexes, however, are cash-settled in an amount equal to the difference between the settlement price of the index and the strike price of the option (times the contract multiplier).

Each quarter, on the third Friday in March, June, September, and December, contracts for stock index futures, stock index options, and stock options all expire on the same day. This so-called "triple witching" period may lead to greater trading activity and increased volatility.

Some index options are AM-settled, meaning they're settled Friday morning but typically stop trading Thursday afternoon. But the settlement price isn't computed until Friday morning. The monthly option AM settlement value isn't based on the opening price of the index, but rather on the price determined by the opening trade price in each stock that comprises the index. This is known as "the print."

What if a market-moving event happens between Thursday night and Friday morning? So-called print risk is the overnight risk of AM-settled options.

Other options are PM-settled, meaning they trade later on expiration day and settle based on the closing value of the underlying security (or the index's closing value). On their final trading day, trading in expiring PM-settled options typically ends at 3 p.m. CT, apart from some broad-based exchange-traded fund (ETF) options, which trade until 3:15 p.m. CT.

On expiration day, options are typically automatically exercised if they're ITM by $0.01 or more as of 3 p.m. CT. In general, the option holder has until 4:30 p.m. CT on expiration day to exercise the contract. These times are set by the Options Clearing Corporation (OCC), the central clearing house for the options market. But some brokerage firms might have an earlier cutoff than this threshold.

If a trader's long option is ITM at expiration but their account doesn't have sufficient funds to support the resulting position, their brokerage may, at its discretion, issue a do-not-exercise (DNE) instruction on their behalf. Any gain the trader may have realized by exercising the option will then be wiped out. DNEs—which can be submitted by any option holder—instruct the broker not to auto-exercise ITM options at expiration. A broker may also, at its discretion, close out (sell) the position without notifying a trader. Meanwhile, all OTM options expire worthless.

Here's one crucial final item for an options trader's expiration checklist: Know and understand the specific risk profile and potential maximum loss of the strategy. For example, the risk profile below shows a long vertical call spread, which is created by being long the 90-strike call and short the 95-strike call. Note that if, at expiration, the price of the underlying security is below the 90 strike, both options will likely expire worthless.

On the other hand, if the underlying security is above $95 at expiration, then the spread will likely be closed without a resulting position in the underlying security, as the $90-strike call is exercised, and the $95 strike is assigned (the stock would then be called at $90, then immediately sold at $95). However, there is no guarantee that the ITM 95-strike call will be assigned (if the holder submits a DNE request, for example), which could result in an unexpected long stock position at $90 per share.