Put Option

What Is a Put Option?

A put option gives the buyer the right — but not the obligation — to sell an underlying asset at the strike price on or before expiration. The buyer pays a premium; the seller collects that premium and accepts the obligation to buy the asset if the buyer exercises.

Puts increase in value as the underlying declines. A stock trading at $100 with a $95 strike put gains intrinsic value below $95. If the stock stays above $95 at expiration, the put expires worthless and the buyer loses only the premium. If the stock falls to $80, the put is worth at least $15 — a substantial return on the premium paid.

Unlike short selling, which requires margin and carries unlimited loss potential, buying a put provides bearish exposure with defined risk equal to the premium paid. This asymmetry makes puts the preferred tool for hedging and speculation on declining prices.

Why It Matters for Options Traders

Puts serve two roles: speculation and protection. As a speculative tool, puts allow traders to profit from declining stocks without the margin requirements and unlimited risk of short selling. A well-timed put before earnings or a sector decline can return multiples of the premium paid.

As insurance, puts cap downside risk. A trader holding equities can buy puts to limit losses — known as a protective put. Institutions managing large portfolios routinely buy index puts to hedge against market declines. The cost is real, like any insurance premium.

Put pricing reflects skew — OTM puts carry higher implied volatility than equivalent calls due to persistent demand for downside protection. Elevated put IV signals fear. The put-call ratio (PCR), which tracks put versus call volume, is a widely followed sentiment indicator.

Key Characteristics

• Right to sell: Buyers have the right to sell at the strike price; sellers are obligated to buy if assigned
• Bearish payoff: Profits when the underlying falls below the strike price
• Defined risk for buyers: Maximum loss is the premium paid, regardless of how high the stock climbs
• Delta: Put deltas are negative, ranging from 0 (deep OTM) to -1.0 (deep ITM)
• Volatility skew: OTM puts typically carry higher IV than equivalent OTM calls due to demand for downside protection
• Expiration timing: Deep ITM puts with significant time remaining trade at a discount to intrinsic value due to the time value of money