What Is a Put Option? How Puts Work and When to Use Them

What Is a Put Option?

A put option gives you the right—but not the obligation—to sell 100 shares of a stock at a specific price before a specific date.

Puts are the opposite of calls. While calls profit when prices rise, puts profit when prices fall.

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Key Terms

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Real-World Analogy: Insurance

Think of a put option as insurance for your stock.

You own a house worth $300,000. You pay $1,000/year for insurance that guarantees you can "sell" it for $300,000 if disaster strikes.

• If the house value drops to $200,000 due to damage, insurance covers the difference
• If nothing happens, you lose the $1,000 premium but keep your house

A put option works the same way for stocks.

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How to Read a Put Option

AAPL 150 Put Jan 2026

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When Is a Put "In the Money"?

A put is "in the money" when the stock price is below the strike price.

This is the opposite of calls.

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Put Option Payoff

Your P&L at Expiration

Profit = Strike Price − Stock Price − Premium Paid

Example: Buy a $100 put for $5 premium

Breakeven Point

Breakeven = Strike Price − Premium Paid

For a $100 put bought at $5: Breakeven = $95

You profit when the stock falls below your breakeven.

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Two Ways to Use Puts

1. Speculation (Betting on a Drop)

Buy puts when you believe a stock will fall.

Example: You think AAPL ($150) will drop after earnings.

2. Protection (Hedging Your Stock)

Own stock? Buy puts to protect against drops.

Example: You own 100 shares of AAPL at $150.

This is called a protective put or "married put."

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Puts vs. Shorting Stock

Puts are safer than shorting because your loss is capped.

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The Greeks for Puts

Key difference: Put delta is negative (you profit when the stock falls).

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When to Buy Put Options

Good Scenarios

• Bearish outlook on a stock
• Protecting gains on stock you own
• Hedging a portfolio before uncertainty
• Defined risk is important
• Expecting a catalyst (earnings miss, bad news)

Bad Scenarios

• Small, slow decline expected (theta eats you)
• IV is very high (puts are expensive)
• No clear thesis or timeline

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What Happens at Expiration?

Warning: If you don't own the stock and your ITM put is exercised, you'll be short 100 shares.

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Common Put Strategies

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Puts and Implied Volatility

Put prices are heavily influenced by implied volatility:

The "volatility smile" means OTM puts often have higher IV than OTM calls—they're priced for crash protection.

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Risks of Buying Puts

1. 100% loss possible — If stock doesn't fall enough, you lose it all
2. Time decay — Every day, your put loses value
3. IV crush — After events, put values can collapse
4. Being right but losing — Stock may fall, but not enough to cover premium

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Key Takeaways

• A put gives you the right to sell 100 shares at the strike price
• Puts profit when the stock falls
• Max loss = premium paid
• Breakeven = strike − premium
• Safer than shorting stock (defined risk)
• Can be used for speculation or protection

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Frequently Asked Questions

What is a put option in simple terms?

A put option gives you the right (but not the obligation) to sell 100 shares of a stock at a specific price (the strike price) before a specific date (the expiration). You pay a premium upfront for this right.

How do you make money on a put option?

You profit on a put option when the stock price falls below your strike price by more than the premium you paid. You can either sell the put for a higher price than you paid, or exercise it to sell shares at the strike price (above market value).

What is the difference between buying a put and shorting stock?

Buying a put limits your risk to the premium paid, while shorting stock has unlimited loss potential. Puts also require less capital and don't have borrowing costs, but they expire and lose time value.

Can you lose more than you invest in a put option?

No. When buying a put option, your maximum loss is limited to the premium paid. This is one of the key advantages of puts over shorting stock.

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Visualize Your Put Option

See exactly how your put option performs at every price point. Enter a ticker, select a strike, and view your breakeven, max profit, and risk.

Build Your Put Strategy →

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Options trading involves significant risk and is not appropriate for all investors. Options can expire worthless, resulting in a 100% loss of the premium paid. Consider your investment objectives and risk tolerance before trading options.

Sources and calculation assumptions

OIC: long put provides background on the mechanics discussed here. Numerical examples on this page are hypothetical, generally use standard 100-share contracts, and exclude fees unless stated. Before-expiration values and probabilities depend on a model; they are not guaranteed returns.