Options are contracts that give you the right to buy or sell a stock at a set price by a certain date

An option is a contract between two people: you and a seller. The seller gives you the right—but not the obligation—to buy or sell 100 shares of a specific stock at a price you both agree on now, even if the stock price changes later. You pay money upfront for this right. That upfront payment is called the premium.

The agreed-upon price is called the strike price. The date by which you must decide is called the expiration date. After that date, the contract expires and becomes worthless if you have not used it.

There are two types of options. A call option gives you the right to buy the stock. A put option gives you the right to sell the stock. Most people who trade options are betting that a stock price will move in a particular direction—up for calls, down for puts—so that the contract becomes more valuable before it expires.

Key Takeaways

  • You pay a premium to own an option contract, and that money is gone whether or not you ever use the option.
  • A call option profits if the stock price rises above the strike price; a put option profits if the stock price falls below the strike price.
  • Options expire on a specific date, and after that date the contract has no value.
  • You can close an option position before expiration by selling the contract to someone else, rather than waiting to exercise it.
  • Options are leveraged—you control 100 shares with a small amount of money, which means losses can exceed your initial premium payment.

How the money works: premium, profit, and loss

When you buy an option, you pay the premium immediately. This is your maximum loss on that trade. If the stock never moves the way you bet, or moves too slowly, the option expires worthless and you lose the entire premium.

If the stock moves in your favor, the option becomes more valuable. You can then sell that contract to someone else for more than you paid, pocketing the difference as profit. Or you can exercise the option—actually buy or sell the 100 shares at the strike price—and then sell those shares at the current market price.

The seller of the option (called the writer) keeps the premium you paid, but takes on the risk that the stock will move against them. If you exercise a call option, the writer must sell you 100 shares at the strike price, even if the stock is now worth much more. If you exercise a put option, the writer must buy 100 shares from you at the strike price, even if the stock is now worth much less.

Call options: betting the stock price will rise

You buy a call option when you think a stock will go up. Say Apple stock is trading at $150 and you buy a call option with a strike price of $155 and an expiration date two months away. You pay $3 per share, or $300 total (since one option contract covers 100 shares).

If Apple rises to $165 before expiration, your option is now worth at least $10 per share—the difference between the current price and your strike price. You can sell that contract for $1,000 or more, keeping the profit. If Apple stays at $150 or falls, your option expires worthless and you lose the $300 premium.

The key point: you only profit if the stock rises enough to cover the premium you paid and then move higher still. If Apple rises to $153, your option is only worth $300 (the $3 difference times 100 shares), which means you break even—you made back your premium but no profit.

Put options: betting the stock price will fall

You buy a put option when you think a stock will go down. Say Microsoft stock is trading at $300 and you buy a put option with a strike price of $295 and an expiration date two months away. You pay $2 per share, or $200 total.

If Microsoft falls to $280 before expiration, your option is now worth at least $15 per share—the difference between the strike price and the current price. You can sell that contract for $1,500 or more. If Microsoft stays at $300 or rises, your option expires worthless and you lose the $200 premium.

Put options are often used as insurance. If you own 100 shares of Microsoft at $300, you might buy a put with a $295 strike to protect yourself if the price crashes. You pay the premium as insurance, and if the stock does fall, the put becomes valuable and offsets your loss.

Why options are riskier than owning stock

Options are leveraged. You control 100 shares with a small amount of money. This magnifies both gains and losses. If you own 100 shares of a $150 stock, you have $15,000 at risk. If you buy a call option on that stock for $300, you control the same 100 shares with only $300 at risk—but you can also lose that $300 entirely, which is a 100 percent loss.

Stock prices can move in ways you do not expect. A company might announce bad news after you buy a call, or good news after you buy a put. Time decay works against you: as the expiration date gets closer, the option loses value even if the stock price does not move. An option that was worth $500 with three weeks left might be worth $200 with one week left, even if the stock price stayed the same.

If you sell (write) an option instead of buying one, your risk is much larger. When you sell a call, you are promising to sell 100 shares at the strike price if the buyer exercises. If the stock soars, you could be forced to sell shares you do not own at a loss, or you have to buy them at the market price first. This is called a naked call and the losses can be unlimited.

Expiration dates and how to close a position

Options expire on a specific date, usually a Friday. On that date, if the option is in-the-money (profitable), it is automatically exercised. If it is out-of-the-money (unprofitable), it expires worthless.

You do not have to wait until expiration. You can close your position at any time by selling the option contract to someone else. If you bought a call for $300 and it is now worth $800, you can sell it and pocket the $500 profit immediately. This is how most options traders actually make money—they sell the contract before expiration rather than exercising it.

The price of an option changes throughout the day based on the stock price, how much time is left, and how much traders think the stock will move. An option that is deep in-the-money (the stock is far above the strike for a call, or far below it for a put) trades close to its intrinsic value. An option that is out-of-the-money trades for very little, sometimes just a few cents.

The difference between American and European options

Most options traded in the United States are American options, which means you can exercise them at any time before expiration. European options can only be exercised on the expiration date itself. This makes American options more valuable because you have more flexibility.

For most traders, this difference does not matter much because they sell the contract before expiration rather than exercising it. But if you plan to hold an option all the way to expiration, knowing which type you own matters.

Frequently Asked Questions

What happens if I buy a call option and the stock price never reaches the strike price?

The option expires worthless and you lose the entire premium you paid. This is your maximum loss. The seller keeps the premium as profit. This is the most common outcome for options buyers.

Can I lose more money than I paid for the option?

If you buy an option, no—your maximum loss is the premium. If you sell (write) an option, yes—especially if you sell a naked call. This is why selling options is considered much riskier than buying them.

How do I know what strike price and expiration date to choose?

Strike prices closer to the current stock price cost more but have a higher chance of profit. Expiration dates further away cost more but give you more time for the stock to move. There is no right answer—it depends on how much you want to risk and how confident you are in your prediction.

Do I have to own the stock to buy a call option on it?

No. You can buy a call option on any stock without owning it. You are just betting on the price direction. If you exercise the call, you will have to pay for the 100 shares, but most traders sell the option before that happens.

What is implied volatility and why does it matter?

Implied volatility is what traders think the stock will move, based on the option prices they are willing to pay. Higher volatility means bigger price swings are expected, so options cost more. If volatility drops, your option loses value even if the stock price does not move.