Simple definition
A put option is a contract that gives you the right — not the obligation — to sell an investment at a set price, called the strike, before a set expiration date. You pay a premium for that right. Think of it like buying short-term insurance on a price: it can pay off, or it can expire worthless.
Why it matters
Puts are advanced tools most long-term investors never need. A put can rise in value if the investment's price falls, which is why some use it as a hedge. But if the price stays above the strike, the put can expire worthless and you lose the entire premium you paid.
Real-life example
Suppose you pay a $150 premium for a put with a $40 strike price. If the stock stays above $40 until the option expires, the put lapses and you lose the full $150. These are rounded, hypothetical figures to show how it works, not a real price.
Common mistakes
- Assuming a put is a safe bet against a stock, when it can expire worthless and lose the whole premium.
- Ignoring the expiration deadline, which means being right too late still leaves you with nothing.
- Buying puts without understanding how quickly their value can erode as time passes.
- Confusing a put, the right to sell, with a call, the right to buy.
Pro tips
- Learn how puts work and accept that losing the full premium is a common outcome before considering one.
- Never put money into options that you can't afford to lose entirely.
- Remember a put only gains if the price falls enough below the strike before expiration.
- Know that a plain, diversified portfolio serves most investors without needing puts.
Related Money Dictionary terms
- OptionsContracts that give you the right, but not the obligation, to buy or sell an investment at a set price by a deadline.
- Call OptionA contract giving you the right to buy an investment at a set price before it expires.
- Strike PriceThe set price at which an option lets you buy or sell the underlying investment.
- Expiration DateThe deadline by which an option contract must be used or it becomes worthless.
- Short SellingBetting an investment's price will fall by borrowing shares, selling them, and hoping to rebuy cheaper later.
- StockA share of ownership in a company that you can buy and sell, giving you a small stake in its profits and growth.
Frequently asked questions
What's the difference between a put option and a call option?
A put option gives you the right to sell an investment at the strike price before expiration; a call gives you the right to buy at the strike. Puts can gain value when a price falls, calls when it rises. Both are short-lived contracts that can expire worthless, costing you the full premium you paid.
Is buying a put the same as short selling?
Not quite. Both can profit if a price falls, but a put option's loss is limited to the premium you paid, while short selling can lose far more — even more than you invested — because a stock's price can keep rising. Both are advanced strategies most everyday investors don't need.
Why would someone buy a put option?
Some investors buy puts as a form of short-term insurance, hoping to offset losses if an investment they own drops in price. Others are simply betting a price will fall. Either way, the put has a deadline, and if the price doesn't move enough before expiration, the premium is lost. It's advanced and risky.
Knowing what Put Option means is knowledge — the first half. A brick gets placed when you act on it: Before considering puts, read investor.gov's options explainer and paper-trade the idea before risking any real money..
Sources & references
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Plain-English education — not personalized legal, tax, or investment advice.