🎟️ What an option is: the right, but not the obligation

🎯 In 30 seconds: An option is a contract. The buyer pays a price, called the premium, and gets the right to buy (a call) or sell (a put) a stock at a fixed price, called the strike, until a fixed date, called the expiration. The seller collects the premium and takes on the obligation to go through with the deal if the buyer asks. One standard stock option covers 100 shares, so a $2.00 premium costs $200. Options can be used to protect a position, earn income or bet on a move. The buyer can lose 100% of the premium. Some sellers can lose far more than they collected.

Start with a concert ticket

Picture a ticket to a concert next month. You paid $40 for it. The ticket gives you the right to walk in on that night. You are not forced to go. If you stay home, the ticket simply expires and your $40 is gone.

Now imagine the show sells out and people offer $150 for your ticket. Your $40 right has become worth a lot more, even though nothing about the ticket changed. What changed is the value of the thing it gives you access to.

An option works the same way. It is a right with an expiration date, and its value depends on what is happening to something else. That something else is called the underlying: usually a stock, an exchange-traded fund (ETF) or an index.

The words you need

• Option: a contract that gives the buyer the right, but not the obligation, to buy or sell an underlying asset at a set price on or before a set date.
• Call option: the right to buy the underlying at the strike price. Call buyers usually expect the price to go up.
• Put option: the right to sell the underlying at the strike price. Put buyers usually expect the price to go down, or want protection in case it does.
• Strike price (exercise price): the fixed price in the contract. A $50 call lets you buy at $50, no matter where the stock trades.
• Expiration date: the last day the contract exists. After it, the right is gone.
• Premium: the price of the option. It is quoted per share.
• Contract multiplier: one standard US stock option covers 100 shares. So you multiply the quoted premium by 100 to get the real cost.
• Holder (buyer, long): the person who paid the premium and owns the right.
• Writer (seller, short): the person who received the premium and carries the obligation.
• Exercise: using the right, actually buying or selling the shares at the strike.
• Assignment: what happens to a seller when a buyer exercises. The seller must deliver or take the shares.

Read a quote like this one: "Company X Dec 18 $50 call at $2.00". That means a call on Company X, expiring December 18, with a $50 strike, costing $2.00 per share. One contract costs $2.00 x 100 = $200, plus any commission or contract fee your broker charges.

Buyers have rights, sellers have obligations

Every option trade has two sides. The buyer pays and the seller gets paid. That is the whole asymmetry of options in one line.

The buyer's worst case is known in advance: the premium paid. The seller's best case is known in advance: the premium received. The seller's worst case can be large. For a seller of a call who does not own the shares, there is no ceiling on how high the stock can go, so there is no ceiling on the loss.

Who stands behind the contract: the OCC

When you buy an option on a US exchange, you never deal with the seller directly. You probably never learn who they are. The trade is cleared by the Options Clearing Corporation (OCC).

The OCC is the central clearinghouse for US-listed options. It acts as the issuer and guarantor of the contracts. In plain words, it stands between the two sides, so if a seller fails to perform, the buyer is still protected by the clearing system, not by the seller's good intentions.

This is also why listed options are standardized. Every Company X Dec 18 $50 call is identical: same 100 shares, same strike, same expiration, same rules. That sameness is what lets thousands of people trade them on an exchange. The OCC also publishes the official risk booklet every options customer must receive, covered in Getting approved and understanding the risks.

Expiration dates

Each option series has an expiration date. The classic one is the standard monthly expiration, the third Friday of the month for US stock options. On the Cboe 2026 calendar, the next two are November 20 and December 18, 2026.

Many stocks and ETFs also have weekly options, and some index products now have an expiration every business day. Options that expire the same day you trade them are called 0DTE (zero days to expiration). They move very fast. You will see how to read all of these dates in Reading an options chain.

Most standardized stock options are American style: the holder can exercise any business day before expiration. Most index options are European style: exercise happens only at expiration. The details are in Exercise, assignment and expiration.

A worked example with real arithmetic

Hypothetical numbers. Company X trades at $50. You think it will rise over the next two months. You have two choices.

Choice A: buy 100 shares. Cost: 100 x $50 = $5,000.

Choice B: buy one $50 call expiring in two months at $2.00. Cost: $2.00 x 100 = $200.

Here is what each is worth at expiration, at three possible stock prices. The call is worth the amount the stock is above $50 (its intrinsic value), and nothing if the stock is at or below $50.

Three things stand out.

• When the stock rises a lot, the call returns a much bigger percentage. That is the attraction.
• At $52 the call buyer just breaks even. The stock has to rise by the premium you paid before you make anything. That point is the breakeven: strike + premium = $50 + $2 = $52.
• If the stock goes nowhere, the shareholder is flat and the call buyer loses everything. Being right "eventually" does not help if it happens after expiration.

Notice also what the shares do that the call does not: they keep existing. If Company X recovers next year, the shareholder still owns it. The call buyer's right expired. Options have a clock, and the clock always costs the buyer something. What an option is worth explains this time value in detail.

The four basic positions

There are only two option types and two sides to each trade. That gives four building blocks. Every strategy you will meet later, from covered calls to iron condors, is a mix of these four, sometimes with shares added.

• Long call: profits if the stock rises above strike + premium. Risk is the premium.
• Short call: keeps the premium if the stock stays at or below the strike. Uncovered, the loss has no limit.
• Long put: profits if the stock falls below strike minus premium. Risk is the premium.
• Short put: keeps the premium if the stock stays at or above the strike. If the stock collapses, you must buy at the strike anyway.

Each one gets its own chapter: Call options and Put options.

Why people use options

1. Hedging (insurance). Someone who owns 100 shares of Company X at $50 can buy a $45 put. If the stock crashes to $30, the put lets them sell at $45 anyway. They paid a premium for that protection, the way you pay for car insurance. See Hedging with protective puts and collars.

2. Income. Someone who owns 100 shares can sell a call above the current price and collect the premium. In exchange, they give up gains above the strike. That is a covered call.

3. Speculation. Someone who expects a move can buy calls or puts with less money than buying or shorting the shares. The percentage swings are bigger in both directions, and time works against the buyer.

The first two uses usually reduce or reshape risk. The third usually increases it. Know which one you are doing before you place a trade.

Where the risk comes from

Options are not just "stocks with extra steps". They add three new ways to lose.

• Time. A bought option loses value as expiration gets closer, all else equal. You can be right on direction and still lose because the move came too late or was too small.
• Leverage. A small move in the stock can be a large percentage move in the option. A 10% drop in the stock in the example above turned into a 100% loss on the call.
• Obligations. Sellers can be assigned and forced to buy or sell 100 shares per contract, sometimes at a bad moment. Uncovered call sellers face losses with no upper limit.

The evidence on how retail option buyers do is not encouraging. A study published in the Review of Finance in 2025 found that retail investors buying options before earnings announcements lost 5% to 9% on average, and 10% to 14% around the announcements with the highest expected volatility, partly because of wide bid-ask spreads and overpaying. Treat options as a skill to learn slowly, with small amounts.

Try it

No trading needed. Pick any stock on your Watchlist and note today's price. Then, on paper, write out a hypothetical call one strike above the price and a put one strike below it, each with a premium of your choosing. For each, compute: cost per contract (premium x 100), breakeven at expiration, and the profit or loss if the stock ends 10% higher, unchanged, and 10% lower. Check your call numbers against the table above. Then move on to Call options.

Sources

• Options Industry Council (OIC): What is an option?
• FINRA: Options
• OIC: Options exercise FAQ (American and European style)
• Cboe: 2026 options expiration calendar (PDF)
• Stanford GSB: de Silva, So and Smith, Losing is Optional: Retail Option Trading and Expected Announcement Volatility