Why the Option Strike You Want May Not Be Listed

Why the Option Strike You Want May Not Be Listed

A share price of $48.70 can make a $48.50 put strike look precise. The chain may show a $48 put and a $49 put instead. The missing half-dollar strike would require a separate contract series. Before an order ticket can offer it, that series must be listed for the underlying and expiration.

That distinction separates a sound comparison from a false choice. An option chain works like an elevator panel. The available stops are set before the order ticket opens. A trader can choose a listed series, set a limit for its premium, or leave the trade alone. The strike itself is already part of the contract.

Strike, premium and limit price do different jobs

The strike is the price at which an option holder may buy or sell the underlying if the contract is exercised. OIC describes equity options as rights on a specified price and date, and notes that equity contracts usually represent 100 shares. OIC's options basics distinguishes the strike from the premium, which is quoted on a per-share basis.

Those terms answer separate questions:

A limit price applies only to an existing option. It sets the price boundary for that contract. Why a $3.15 Option Limit Order Can Be Rejected explains the separate premium-price grid.

The listing grid determines which strikes can appear

OIC says equity-option strikes are listed in increments of $0.50, $1, $2.50, $5 or $10, depending on the price level. Its current FAQ adds that the one-point program may cover up to 150 designated individual securities for strikes from $1 through $50, while ETFs may list $1 intervals up to $200. Participation can change. OIC's general information FAQ supplies those program-level boundaries.

Cboe's current rule book shows why a chain cannot be reduced to one universal interval. The following table summarizes selected provisions for individual-stock options on Cboe. It is a venue example, not a substitute for checking an actual chain.

Cboe Rule 4.5 contains additional programs and exceptions, including rules for long-term options and short-term series. A permitted interval describes what an exchange may list. It does not promise that every increment will exist in every expiration, appear immediately after an underlying move, or be supported in every brokerage interface.

Expiration matters as much as the underlying

The same stock can have a different set of listed strikes in different expirations. Cboe's rule book separates monthly, short-term and long-term listing conditions. Its selected provisions of the Options Listing Procedures Plan also say an exercise price must be reasonably close to the underlying at the time the exchange decides to list the series, with range limits and program exceptions. Cboe Rule 4.7 is the source for that venue treatment.

A strike in one expiration is not evidence that the same strike exists in another. The exact series needs an underlying, call or put, strike and expiration before a price comparison begins. Options Matrix Pro's guide to strike price and expiration covers those contract terms, while how to read an options chain shows where they appear on the screen.

OCC's market-data navigation includes a Series Search service for inspecting available series. A broker's current chain is the screen used for an order, so compare it with the official series record before assuming a series can be selected.

The nearest strike is a different contract

Suppose an underlying is at a fictional $48.70 and a trader wants a put that is close to that level for a particular expiration. The chain offers $48 and $49 strikes, not $48.50. With the premium ignored for the moment, the two listed puts have different immediate exercise relationships.

The $49 put gives the holder a right to sell 100 shares at $4,900. The $48 put sets that exercise level at $4,800. The exercise-price difference is $100 per standard contract. Premium, time value, implied volatility, liquidity and the eventual share price still determine the trade's economics, so the table does not identify a preferred strike or a likely result.

The correct comparison starts over when the desired strike is absent. A trader should recalculate moneyness, premium, breakeven, payoff and position size for each listed alternative. Options moneyness and how to compare options contracts provide the next checks.

A four-step strike check

1. Confirm the exact expiration before looking at a strike. Weekly, monthly and long-term series can differ.
2. Read the strikes listed for that series. Do not infer availability from another expiration or another underlying.
3. Keep strike, premium and limit price separate. Each number has a different contractual or order-entry role.
4. If the preferred strike is unavailable, model the nearest listed alternatives as new contracts with new risk boundaries.

Select from the listed series for the exact expiration, then compare the contracts that exist. A missing strike calls for a fresh analysis of each nearby listed contract.

Options involve risk and are not suitable for all investors. This article is for education and does not provide investment advice or a recommendation to buy or sell any security.