A call option gives its buyer the right to buy the underlying at a set price; a put gives its buyer the right to sell it. If the option is exercised and the trade is assigned, the writer has the matching obligation: to deliver the underlying for a call or buy it for a put. The names describe these contractual rights—not, by themselves, who is buying or selling the option.
How calls and puts differ
| Feature | Call option | Put option |
|---|---|---|
| Buyer’s right | Buy the underlying at the strike price, subject to the contract’s exercise terms. | Sell the underlying at the strike price, subject to the contract’s exercise terms. |
| Writer’s obligation if assigned | Sell or deliver the underlying at the strike price. | Buy the underlying at the strike price. |
| Typical directional intuition for a long option | Often gains value when the underlying rises. | Often gains value when the underlying falls. |
| Buyer’s maximum loss | The premium paid. | The premium paid. |
| Writer’s potential loss | A call writer may face theoretically unlimited loss potential. | A put writer may face substantial loss potential. |
The directional rows are a starting intuition, not a full explanation of an option’s price. Premium, time remaining, volatility, and other contract and market factors affect value. A long option can lose value even if the underlying moves in the expected direction.
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What “buy a call” and “buy a put” mean
Buying a call means paying a premium for the right to buy the underlying at the strike price. Buying a put means paying a premium for the right to sell it at that price. Neither buyer is required to exercise. A holder may also be able to sell the option itself in the market, depending on its value and market conditions.
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For example, the Options Industry Council (OIC) illustrates a call with a $50 strike when the underlying is at $60. The holder could exercise to buy at $50, or potentially sell the option if it has market value. Its put illustration uses a $25 strike when the underlying is at $20: the holder could exercise to sell at $25, or potentially sell the option if it has value. These are simplified illustrations, not recommendations; being in the money does not guarantee a net profit after the premium and costs. See OIC’s call-option explanation and put-option explanation.
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What happens when you sell, or write, an option?
Selling an option to open a position makes the seller the writer. The writer collects the premium but takes on the contract’s obligation if assigned: a call writer must sell or deliver the underlying at the strike, while a put writer must buy it. The premium does not remove that obligation or cap the writer’s potential loss at the amount collected.
When a holder exercises, a short writer is assigned to fulfill the contract. Assignment procedures and timing matter, so consult the official OIC/OCC/FINRA guide to understanding assignment and your broker’s rules.
Premium, expiration, and exercise
The option’s price is called its premium and is generally quoted per share for equity options. The buyer pays the premium and can lose the entire amount if the option expires without value; the buyer’s loss is limited to the premium paid. A writer receives the premium but can face losses greater than that amount—potentially theoretically unlimited for a call writer, and substantial for a put writer.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →An option ceases to exist after expiration. An American-style option may be exercised on or before expiration; a European-style option may be exercised only on expiration. OIC describes exchange-traded equity options as American-style, but check the terms of the specific contract rather than assuming every option has the same exercise rules.
Contract size and stockholder rights
Standard equity options usually represent 100 shares, but this is not universal. Contract deliverables may be adjusted, including after corporate actions, and other option types can have different terms. Check the contract’s deliverable before evaluating what exercise or assignment would require.
Holding an equity option does not by itself make you a stockholder or give you stockholder rights such as voting or dividends. A call holder must exercise and take ownership of shares to obtain those rights.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which is riskier: buying or selling options?
Call versus put tells you whether the holder has the right to buy or sell; it does not by itself determine risk. Buying either type limits the buyer’s loss to the premium paid, though the buyer can lose all of it. Writing either type brings an obligation if assigned and can expose the writer to losses greater than the premium received. The scale and nature of that exposure differ by position and contract, so neither “calls” nor “puts” is inherently the safer category.
Options trading carries risk and requires approval from your brokerage firm. Before buying or writing an option, read the current Characteristics and Risks of Standardized Options (ODD), the official disclosure document for exchange-traded options. OIC/OCC provides access through its brochures and literature page. OIC’s options basics and FAQ are educational resources, not substitutes for the ODD.
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