Protective Put

What is a protective put?

A protective put is an options strategy that buys one put for every 100 shares of stock owned. The put sets a minimum sale price for the shares through its expiration, while the shares keep their upside, less the premium paid. It works like insurance: the premium is the cost, and the strike sets the floor.

One standard put provides the right to sell 100 shares at its strike. A married put opens the shares and put together. Adding a put to an existing holding creates the same structure. Use the stock’s historical cost for the lifetime result and its current price to evaluate a new hedge from today.

How to calculate protective put max loss and breakeven

At expiration, the combined stock-and-put value per share is the greater of the stock price and put strike. Subtract the stock reference price and put premium to calculate P&L.

The example buys 100 shares at $100 and a 95 put for $2.50. Total entry cost is $10,250. The minimum expiration value is $9,500, producing a $750 maximum loss. Breakeven is $102.50.

At an $80 stock price, the shares lose $2,000 and the put has $1,500 of intrinsic value. Subtract the $250 premium and the combined loss is $750. At $112, the shares gain $1,200 and the put expires with zero intrinsic value, producing a $950 profit.

For shares purchased well below today’s price, the protected floor locks in a positive lifetime result when the strike sits above the cost basis. Calculate that result directly from your cost basis.

Protective put delta and value before expiration

Before expiration, the hedge works through delta. With 100 shares and a standard put carrying −0.50 delta, the combined position has +50 shares of delta, so a one-dollar stock move changes the position value by $50 with the other pricing inputs fixed.

As the put moves deeper in the money, its delta approaches −1 and offsets more of the shares’ price sensitivity. At-the-money protection still has substantial positive combined delta before expiration. The put’s sale right remains established by its strike throughout the contract’s exercise window.

A put has zero intrinsic value when the stock is above its strike. Its market premium then consists of time value. Reprice the contract across stock price, remaining time, and implied volatility to see how the hedge value changes.

How to choose the protective put strike and expiration

Choose the lowest stock value you want the put to secure, then select the strike and expiration that deliver that coverage. Compare the premium for each candidate with the resulting floor. Higher put strikes create higher floors and cost more for the same expiration.

Match the contract deliverable to the covered shares. One standard put protects 100 shares of a 250-share holding; model the remaining 150 shares separately. Set the expiration beyond the event or holding period the hedge is designed to cover. Compare stock-only and protected outcomes in the options profit calculator, and plan whether to retain the shares, sell the package, exercise the put, or replace the protection at the end of the window.

Risks and limitations of protective puts

• Budget the premium as the price of the floor. The $250 premium raises breakeven to $102.50, so the stock must be $2.50 higher at expiration before the protected position earns anything.
• Measure the floor from the strike, not the purchase price. The example still loses $750 below $95 at expiration, and a lower strike costs less but leaves more loss before protection begins.
• Buy a put deeper in the money for a tighter hedge before expiration. The put offsets part of the stock’s moves: with a −0.50 delta, a $1 drop still costs $50.
• Replace the put to extend the protection window. Protection ends at expiration. If the stock stays above $95, the put’s time value decays to zero, and covering a longer period means buying another put.
• Buy one standard put for every 100 shares. A 250-share holding with one put leaves 150 shares unprotected.

Bottom line

Shares with a 95 put beneath them lose at most $750, however far XYZ falls, and the $250 premium leaves the upside open above $102.50. Buy it for a holding you mean to keep through a specific event, pick the strike from the lowest value you will accept, and match the expiration to the risk window.