How does a protective put work as portfolio insurance?

A protective put (also called a married put) is essentially buying downside insurance for a stock position. You:

1. Own the underlying stock
2. Buy a put option on that same stock

The insurance analogy:

• The put premium is like an insurance premium
• The strike price is like the deductible boundary — losses beyond this are covered
• The payoff floor is guaranteed regardless of how far the stock falls

Payoff profile:

• Maximum profit: Unlimited (stock can rise indefinitely; put expires worthless)
• Maximum loss: (Purchase price - Strike price) + Premium paid
• Breakeven: Purchase price + Premium paid

Example:

You own shares of Atlas Semiconductor at $100. You buy a put with a$90 strike for $5.

Stock Price at Expiry	Stock P/L	Put Payoff	Net P/L
$60	-$40	$30 (90-60)	-$40 +$30 - $5 = **-$15**
$80	-$20	$10 (90-80)	-$20 +$10 - $5 = **-$15**
$90	-$10	$0	-$10 +$0 - $5 = **-$15** (max loss)
$100	$0	$0	$0 -$5 = -$5
$105	+$5	$0	$5 -$5 = $0 (breakeven)
$120	+$20	$0	$20 -$5 = +$15

Notice that no matter how far Atlas Semiconductor drops — even to $0 — your maximum loss is capped at$15.

Covered call vs. protective put:

Feature	Covered Call	Protective Put
Market view	Neutral to slightly bullish	Bullish but worried about downside
Cost	Generates income (premium received)	Costs money (premium paid)
Upside	Capped at strike	Unlimited
Downside	Partially cushioned	Hard floor on losses

Is it worth the cost? The put premium creates a drag on returns. If the stock rises, you've paid for insurance you didn't need. It's most valuable when:

• You have a concentrated position and can't afford a large loss
• Earnings announcements or macro events create binary risk
• You're bullish long-term but worried about short-term volatility

Explore more options strategies in our CFA Level I derivatives section.