What is Put Option?
Definition
A put option gives the holder the right, but not the obligation, to sell a specified number of shares at a predetermined strike price before expiration. Investors buy puts when they expect a stock price to decline or want to protect an existing stock position from downside risk.
Detailed Explanation
Put options work as the mirror image of calls. A put with a $100 strike gives you the right to sell 100 shares at $100 each, regardless of how low the stock falls. If the stock drops to $80, your put is worth at least $20 per share. If the stock stays above $100, the put expires worthless.
Puts are the most direct form of portfolio insurance. An investor holding 1,000 shares of a stock at $100 can buy 10 put contracts with an $95 strike to limit their maximum loss to $5 per share plus the put premium. This protective put strategy allows participation in upside while defining maximum downside — similar to an insurance deductible.
The cost of put protection (the premium) depends primarily on implied volatility, time to expiration, and how far out-of-the-money the strike is. During calm markets, puts are relatively cheap. During volatile or declining markets, put prices surge as demand for protection increases (this is the volatility skew phenomenon).
Puts are also used speculatively to profit from declines. Buying puts has advantages over short selling: the maximum loss is limited to the premium paid (versus unlimited for shorts), no borrowing fees, and no margin requirements. However, puts have expiration dates, while short positions can be held indefinitely.
Formula
Put Profit at Expiration = Max(0, Strike Price - Stock Price) - Premium PaidExample
Buy 1 TSLA $250 put for $8. If TSLA drops to $220, the put is worth $30. Profit: $30 - $8 = $22 per share ($2,200 per contract). If TSLA stays above $250, the put expires worthless. Loss: $800.
Frequently Asked Questions
How do puts protect my portfolio?
Is buying puts better than short selling?
Related Terms
Call Option
A call option gives the holder the right, but not the obligation, to buy a specified number of shares at a predetermined price (strike price) before a specific expiration date. Investors buy calls when they expect the stock price to rise, as calls increase in value as the underlying stock appreciates.
Strike Price
The strike price (or exercise price) is the predetermined price at which an option holder can buy (for calls) or sell (for puts) the underlying asset. It is the most important factor in determining an option's value and risk/reward profile.
Implied Volatility (IV)
Implied volatility is the market's forecast of the likely magnitude of a stock's price movement, derived from option prices. High IV means options are expensive because the market expects large price swings, while low IV means options are cheap because calm conditions are expected.
Options Premium
The options premium is the price paid by the buyer to the seller for an option contract. It consists of intrinsic value (how much the option is in-the-money) and extrinsic value (time value plus volatility value). The premium represents the maximum loss for option buyers and maximum gain for option sellers.
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Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute investment advice. AI-generated analysis may contain errors or inaccuracies. Always conduct your own research and consult a qualified financial advisor before making investment decisions.
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