Protective put vs stop loss: which one holds when the stock gaps down?
A stop loss costs nothing and works fine in a slow slide. A protective put costs money every time, but it is the only one of the two that still sells at your price after an overnight gap.
The short answer
Use a stop loss when the stock trades every day without big jumps and you just want out below a line. It is free. Use a Protective put when the danger is a gap: earnings, news, a drug trial. A put lets you sell at the Strike price no matter where the stock opens. You pay for that, every single time, whether you need it or not.
A Stop loss is an order. It turns into a market order when price touches your stop. If the stock opens far below your stop, it sells at that far-lower price. A put is a contract. It gives you the right to sell at the strike until it expires, gap or no gap.
Side by side
| Stop loss | Protective put | |
|---|---|---|
| Cost up front | Nothing | The premium |
| Sells at | The next price after your stop is hit | The strike, any time before expiry |
| Overnight gap | Fills at the open, below your stop | Still worth the strike |
| A dip that bounces back | Sells you out at the low | You keep the shares |
| Slow slide | Works well | Works, minus the premium |
| Rally | Costs nothing | The premium is gone |
| Lasts | Until you cancel it | Until the put expires |
| Account | Any | Needs options approval |
A worked example (hypothetical)
You own 100 shares of Cobalt Freight, a made-up stock, bought at $50. That is $5,000.
- Stop loss: a stop at $45.
- Protective put: a 60-day $45 put for $1.00, or $100.
Here are four ways the next two months could go.
| What happens | Stop loss | Protective put |
|---|---|---|
| Bad news, opens at $38 | Sells near $38: −$1,200 | Sell at $45: −$500 − $100 = −$600 |
| Slow slide to $40 | Sells near $45: −$500 | Sell at $45: −$500 − $100 = −$600 |
| Dips to $44.80, ends at $52 | Sells near $45: −$500 | Still hold: +$200 − $100 = +$100 |
| Rallies to $58 | Never triggers: +$800 | +$800 − $100 = +$700 |
Row 1: the gap
The stop was at $45, but the stock never traded there. It closed at $50 and opened at $38. Your stop became a market order at the open and sold near $38. Loss: ($50 − $38) × 100 = $1,200.
The put does not care how the stock got there. You can sell your shares at $45, or sell the put for at least its $7 of value. Loss: $500 on the shares plus the $100 put = $600. That gap is the one day a put earns its keep.
Row 2: the slow slide
Here the stop wins. The stock walks down through $45, the stop fills near $45, and you lose $500. The put gets you out at the same $45, but you also paid $100 for it. −$600. The insurance was wasted money.
Row 3: the fake-out
The stock dips to $44.80 for an hour and then climbs to $52. The stop sold you near $45, right at the bottom: −$500, and you watched the rest from the sidelines. The put holder never had to act. Shares up $200, minus the $100 put: +$100.
Row 4: the rally
The stop sits unused and costs nothing: +$800. The put expires worthless: +$700. You paid $100 for a fire that never came.
Two of the four rows go against the put. That is normal. Insurance loses money in most months. The question is whether you can live through the month it doesn't.
What a year of puts really costs
One put lasts 60 days. To stay protected all year you buy six of them. At $100 each, that is $600 a year on a $5,000 position, about 12% of the position. The stock has to rise more than that just for you to break even on the hedge.
A put closer to the share price costs more. A put further away costs less but protects less. Prices also jump when fear is high, which is exactly when people want them. Run your own numbers with the options profit calculator before you make puts a habit.
That cost is why most people don't hedge every position all year. They buy a put for a known event, like earnings, and use a stop the rest of the time. How stop losses work overnight covers when your stop is even live.
Pick a stop if… pick a put if…
| Pick a stop loss if… | Pick a protective put if… |
|---|---|
| The stock trades smoothly with few gaps | Earnings or big news is coming |
| You want no cost at all | A gap would hurt more than the premium |
| You are fine being sold out on a dip | You want to keep the shares through a dip |
| You don't have options approval | You want a floor you know to the cent |
Want the floor but not the bill? A Collar sells a call to pay for the put. Protective put vs collar shows what that gives up. For every hedge and strategy in one table, see the options strategy comparison chart.
In Canada, buying a put on shares you own is widely allowed in a TFSA or RRSP, but options permissions differ by broker.
Questions
Does a stop loss protect me from a gap down?
No. A stop becomes a market order once price reaches it. If the stock opens below your stop, it sells at the open price, which can be far lower.
Is a protective put worth the cost?
Around a known event, often. All year, it adds up fast. In our example six 60-day puts cost about 12% of the position over a year.
Can I use a stop loss and a put together?
Yes. Some traders keep a stop for normal days and buy a put only before earnings. Just don't let the stop sell your shares while the put is still open, or you are left holding a put on shares you no longer own.
What is the difference between a protective put and a married put?
The payoff is the same. A married put is bought on the same day as the shares. A protective put is added to shares you already hold. The timing can matter for taxes. See married put vs protective put.
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