The Options Contract: What You Are Actually Agreeing To

When you place an options trade, you are not simply buying or selling a financial instrument. You are entering into a binding contract with a counterparty you will never meet. That contract specifies exactly what each party is entitled to, what each party is obligated to do, and under what conditions those obligations are triggered.

Most beginner explanations of options skip directly to strategy. The contract mechanics get a paragraph, if that. This article corrects that gap, because understanding the contract is what makes every strategy legible.

The 100-Share Multiplier

The first thing every new options investor needs to understand about an options contract is that it does not represent a single share of stock. One standard equity options contract controls 100 shares.

This has significant practical implications. When you see an option quoted at $2.00, the actual cost to buy one contract is $200, because that $2.00 price is per share and each contract covers 100 shares. When you sell a covered call and collect $1.50 in premium, you are collecting $150, not $1.50.

This multiplier applies to both the premium you pay or collect and to the potential profit or loss on the position. A $5.00 move in the option price is a $500 move per contract. Understanding this before placing a first trade is not optional. It is the arithmetic of every decision that follows.

What the Buyer Has Agreed To

The buyer of an options contract pays a premium at the moment the trade is placed. In exchange, they receive one right, which is the right to buy shares (if it is a call) or sell shares (if it is a put) at the strike price on or before the expiration date.

That is the entirety of the buyer's obligation at entry: pay the premium. After that, the buyer holds a right they can use or abandon. If the trade moves in their favor, they can exercise their right or sell the contract to another buyer at a profit. If the trade moves against them, they can let the contract expire worthless. The premium paid is the maximum loss.

Nothing more is required of the buyer unless they choose to act.

What the Seller Has Agreed To

The seller of an options contract receives the premium at the moment the trade is placed. In exchange, they accept an obligation. If the buyer chooses to exercise their right, the seller must perform.

For a seller of a call, performance means delivering 100 shares of the underlying stock at the strike price. For a seller of a put, performance means purchasing 100 shares of the underlying stock at the strike price.

This is the assignment process. It is automatic and cannot be refused once the buyer exercises. The seller who wrote the contract cannot change their mind when assignment arrives.

This is why the seller's side of the options market requires more attention to position sizing, more awareness of risk, and more discipline around management rules. The obligation to perform is real and binding.

Exercise and Assignment

Exercise is the act of using the right embedded in an options contract. Assignment is what happens to the seller when the buyer exercises.

Most equity options in the United States are American-style, meaning they can be exercised at any time before expiration. European-style options can only be exercised at expiration. Most index options are European-style. Most individual stock options are American-style. This distinction matters less in practice than it sounds, because most options are closed before expiration rather than exercised. But understanding it prevents surprises.

When a call option is exercised, 100 shares of stock are transferred from the seller to the buyer at the strike price. When a put option is exercised, 100 shares are transferred from the buyer to the seller at the strike price. In both cases, the premium already paid at entry belongs to the seller regardless of what happens at exercise.

For most investors using covered calls and cash-secured puts, assignment is not a disaster. It is a defined, expected outcome. A covered call seller whose stock is called away sells shares at the strike price they agreed to. A cash-secured put seller who is assigned buys shares at the strike price they were willing to pay. Both outcomes were planned for at entry.

Expiration: What Happens When the Clock Runs Out

At expiration, every options contract resolves in one of two ways.

If the option is in the money at expiration, it is exercised automatically by the broker for the buyer. The seller is assigned. Shares change hands.

If the option is out of the money at expiration, the contract expires worthless. The buyer loses the premium paid. The seller keeps the full premium collected. The obligation is extinguished.

There is no in-between. No partial exercise. No negotiation. The strike price either had value at expiration or it did not, and the contract settles accordingly.

Frequently Asked Questions

What does it mean to exercise an options contract? Exercising an options contract means using the right embedded in it. The buyer of a call exercises by purchasing 100 shares of the underlying stock at the strike price. The buyer of a put exercises by selling 100 shares at the strike price. Exercise triggers assignment on the seller's side, meaning the seller must fulfill their obligation. In practice, most options traders never exercise their contracts. They sell the option itself for a profit when it has gained value, or let it expire if it has not.

What happens if I sell a covered call and the stock rises above my strike price? If the stock is above your call's strike price at expiration, your option will be exercised and your 100 shares will be called away at the strike price. This is called assignment. You sell your shares at the agreed strike price and keep the premium you collected when you sold the call. You no longer own the shares after assignment. This is a defined, planned outcome for any covered call seller. The appropriate response at entry is to choose a strike price you are comfortable selling your shares at, should assignment occur.

Can I be assigned before the expiration date? Yes, for American-style options, which cover most individual equity options in the United States. Early assignment is possible at any time before expiration when the option is in the money. It is most common on the day before a stock goes ex-dividend, when the call seller may be assigned by a buyer who wants to own the shares to receive the dividend. Early assignment is not common, but it is a real possibility that every options seller should be aware of and plan for.

Andy

Next in this series: How to Read an Options Chain Without Getting Overwhelmed takes the contract mechanics covered here and shows you where to find every piece of this information in a real options chain before you place a trade. And In the Money, At the Money, Out of the Money: Once and for All covers the moneyness categories that directly affect which contracts get exercised at expiration.

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This newsletter is for educational purposes only and should not be considered investment advice. Options trading involves significant risk and is not suitable for all investors. Past performance does not guarantee future results. Always consult with a qualified financial professional before making investment decisions.