Protective Put

What Is a Protective Put?

A protective put (also called a married put) is an options strategy where an investor buys a put option on stock they already own to limit downside risk. The put acts as insurance: it guarantees a minimum selling price (the strike price) while preserving all upside potential above the current price, minus the cost of the put.

The protective put is the simplest and most direct form of portfolio insurance. It converts the stock's unlimited downside into a defined maximum loss equal to the distance to the strike price plus the premium paid.

Why Protective Puts Matter

Protective puts solve a fundamental problem in investing: how to protect gains or limit losses without selling the position. This is valuable when:

• Tax considerations: Selling stock triggers capital gains taxes. A protective put protects against decline without creating a taxable event (though beware of "constructive sale" rules for deep ITM puts)
• Concentrated positions: Executives and founders often have large single-stock positions they cannot sell due to lock-up agreements, insider trading windows, or signaling concerns. Protective puts provide a safety net
• Event risk: Before binary events (earnings, FDA decisions, elections), protective puts lock in a worst-case scenario while maintaining upside participation

Protective Put Payoff

The combined position behaves like a long call option (this is synthetic equivalence via put-call parity):

• Maximum loss: Strike Price - Stock Price + Premium Paid (capped)
• Breakeven: Stock Price + Premium Paid (the stock must rise enough to cover the insurance cost)
• Maximum profit: Unlimited (reduced by premium paid)

Optimizing Protective Put Strategies

Several approaches reduce the net cost:

• OTM puts: Buying puts 5-10% below the current price costs less than ATM puts. You accept the first 5-10% of downside in exchange for cheaper protection below that threshold
• Collar: Simultaneously selling an OTM call partially or fully funds the put purchase. This caps upside but makes the insurance free or nearly free
• Put spreads instead of outright puts: Buying a put and selling a lower-strike put reduces cost but also caps the protection at the sold put's strike
• Timing: Buy protection when IV is low. A protective put purchased at 15% IV is far cheaper than the same put at 30% IV. The best time to buy insurance is when nobody else wants it