Chapter 4: Option Order Types

Navigating the Options Chain

When looking at an options chain, traders are presented with a menu of available contracts, each listed with prices, expiration dates, strike levels, and other relevant data. From this list, the investor selects the contract that suits their objectives, determines the type of transaction they wish to enter, and specifies how the order should be executed.

Alongside the basic price information, the chain often includes additional indicators. For instance, the open interest column shows how many contracts of that option are currently outstanding, which serves as a measure of activity and liquidity. Another useful figure is implied volatility, which reflects the market’s expectation of how volatile the underlying asset is likely to be over the life of the contract, as inferred from the option’s current market price. Together, these details guide the trader in deciding which contract to buy or sell.

The Four Basic Transactions

All the sophisticated strategies that appear later in options trading are ultimately built from four basic types of transactions.

• Buy-to-Open (BTO): A transaction used to establish a new long position in either a call or a put.

• Sell-to-Close (STC): A transaction used to exit a long position and realize a profit or loss.

• Sell-to-Open (STO): A transaction placed when a trader writes a new option, thereby creating a short position.

• Buy-to-Close (BTC): A transaction used to eliminate a short position.

Every combination of spreads, straddles, and multi-leg strategies starts with these simple mechanics.

Order Types and Execution

Once a trader has decided on the contract and transaction type, the next step is to determine how the order will be carried out.

The most basic method is the market order, which instructs the broker to buy or sell immediately at the best available price. Market orders guarantee execution but offer no protection against slippage if prices move quickly. Many traders prefer limit orders, which specify the exact price at which they are willing to trade or better. A buy limit ensures the trader will not pay more than the specified price, while a sell limit ensures they will not accept less. The drawback is that if the market never touches the specified price, the order may remain unfilled and opportunities can be missed.

Another common instruction is the stop order, which becomes active only once the option reaches a certain trigger price. Stop orders are typically used to cap potential losses, automatically closing a position if the market turns against the trader. Unlike limit orders, once activated, stop orders execute as market orders, which means the final price may differ from the stop level. A variation is the stop-limit order, which also activates once a stop price is reached but will only execute at the specified limit price or better. This prevents the order from being filled at an unfavorable price, but it also introduces the risk that the order may not be executed at all if the market moves past the limit level too quickly.

Orders can also carry different time conditions. A day order is valid only for the trading day on which it is placed and is canceled if not filled by the close. A good-’til-date (GTD) order remains active until a specific date chosen by the trader, while a good-’til-canceled (GTC) order stays open until it is either executed or manually withdrawn. Traders may also add instructions such as all-or-none (AON), which requires that the entire order be filled under the given conditions; otherwise, nothing is executed. Without such an instruction, it is possible to receive a partial fill, where only part of the order is matched.

Advanced Order Logic

For those who want greater control, many brokers also provide advanced order types. Among these are contingent orders, which are executed only if the underlying asset reaches a particular price level. These resemble stop orders but are designed to hinge on the behavior of the underlying rather than the option itself. Another variation is the trailing stop order, which begins like a stop but adjusts dynamically as the market moves in the trader’s favor. By setting a trailing percentage or dollar amount, the stop price follows the option higher (or lower, depending on the position), locking in gains while still giving room for the position to appreciate further.

Other specialized structures include one-cancels-other (OCO) orders, where two linked orders are placed simultaneously but only one will survive. If one is triggered, the other is automatically canceled, allowing traders to set both a profit-taking level and a stop-loss level without risking double execution. There are also one-triggers-other (OTO) orders, where the execution of a primary order immediately activates a secondary one. These advanced order types give traders the flexibility to manage risk and opportunity with greater precision.

Marking to Market and Margin

Because options provide built-in leverage, exchanges must ensure that all parties can meet their financial obligations if a contract is exercised. To safeguard the system, no options trade can be entered without collateral on deposit. This collateral is called margin, and it serves as a financial guarantee.

At the close of every trading day, the clearinghouse performs a process known as marking to market. Each account is evaluated in light of the day’s closing prices to verify whether sufficient margin remains to support its open positions. If the account meets requirements, positions carry forward into the next session without interruption. If it does not, the broker issues a margin call, demanding additional funds be deposited. Failure to respond typically results in the forced liquidation of positions, ensuring that the system remains solvent.

Moneyness

In options trading, the profitability of a contract at any given time is referred to as its moneyness. An option is in the money when exercising it would generate a profit, while it is out of the money when exercise would not be worthwhile. If the market price and the strike price are exactly equal, the contract is considered at the money.

For calls, moneyness depends on whether the strike price is below the underlying’s market value. A call option with a $50 strike is in the money if the asset trades above $50, since the holder could buy at the strike and sell immediately at a higher price. If the market price is below the strike, the call is out of the money.

Puts operate in the reverse manner: a $35 put is in the money when the market is below $35, allowing the holder to sell at the strike while the market offers less. Above $35, that put becomes out of the money. For writers, the outcomes are flipped; the option they sold is profitable for the holder precisely when it represents a liability for them.

Open Interest

Another key measure of activity in the options market is open interest, which counts the total number of contracts outstanding at any time. It differs from trading volume, since many trades are simply the closing of existing positions rather than the creation of new ones. Higher open interest typically signals deeper markets and stronger investor participation.

Expiration and Exercise

Every option eventually expires, creating decision points for holders and writers alike. Standard equity options generally expire on the third Friday of the contract month, with trading ending at the close of business the day before expiration.

The time from initiation to expiration is known as the option’s life or time to expiration. Traders who wish to maintain exposure beyond expiration often roll their positions—closing out the current contract and simultaneously opening a new one with a later expiration or different strike. Expiration cycles are especially active during "Quadruple Witching" days in March, June, September, and December, when multiple derivative types expire together, often creating sharp volatility.

To exercise an option means to act on the right it conveys. A call holder exercises by purchasing the underlying at the strike, while a put holder exercises by selling at the strike. At expiration, brokers may automatically exercise profitable contracts. When exercise occurs, the clearinghouse randomly assigns the obligation to one of the option writers.

Delivery and Settlement

Settlement depends on the type of option. For equity options, the standard is physical delivery. If a call option is exercised, the writer must deliver the actual shares of stock to the buyer’s account. Only the transfer of the actual shares closes the deal.

Other types of options, such as index options, are settled in cash rather than with physical delivery. In this case, the settlement amount equals the difference between the strike price and the closing value of the index, multiplied by the option’s contract multiplier (often $100).

Extrinsic and Intrinsic Value

The price of an option can be broken into two main components: intrinsic value and extrinsic value.

1. Intrinsic Value: This represents the portion of the option’s price that comes directly from its relationship to the underlying asset. It is the amount of money that could be realized if the option were exercised immediately. Intrinsic value exists only when the option is in the money.

2. Extrinsic Value (Time Value): This is the difference between the total market price of the option and its intrinsic value. It reflects the value of the time remaining until expiration and the potential for the underlying asset to move favorably.

As expiration approaches, extrinsic value shrinks—a process known as time decay. A related concept is parity, which occurs when an in-the-money option trades for only its intrinsic value, with no time value remaining.

Relationships Among Options

Traders can choose from multiple strike prices and expiration dates, each offering different potential payoffs and risks. These relationships are organized via the options cycle, or expiration cycle, which describes the pattern of expiration months available for contracts on a given asset. Understanding the cycle matters because it determines which expiration months are available at any given time, and thus which strategies can realistically be implemented.