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Short strangle
A short strangle is a two-legged, undefined-risk, neutral option strategy. You sell an out-of-the-money put and an out-of-the-money call with the same expiration, collecting a net credit. The chart below shows a short strangle with put strike 95 at $3, call strike 105 at $3, and the profit/loss diagram.
Greeks and this strategy
| Greek | How it behaves |
|---|---|
| Delta | Near zero between strikes. Becomes directional if price breaches either short strike. |
| Theta | Positive. Out-of-the-money short legs decay while price stays in the range. |
| Gamma | Negative. Large moves accelerate adverse delta changes beyond the short strikes. |
| Vega | Negative. Prefers stable or falling implied volatility. |
Overview of short strangle
A short strangle combines a short put at a lower strike with a short call at a higher strike. Both legs share the same expiration date. Maximum profit is limited to the net credit received. Losses can grow quickly if the underlying makes a large move beyond either strike. Each contract represents 100 shares of the underlying (relevant for the US market).
Market outlook for short strangle
Traders open a short strangle when they expect the underlying to stay within a range through expiration. The strategy collects premium from both out-of-the-money legs and benefits from time decay when price remains between the strikes. Wider strikes reduce credit but increase the profit zone.
How to open a short strangle
Open the position by selling a put below the current price and a call above the current price with the same expiration. Both orders are typically placed together as a single strangle order. The net credit received is the sum of both premiums. Traders evaluate support and resistance when selecting strikes.
Profit/loss diagram for a short strangle
Maximum profit equals the net credit received and is realized if the stock closes between the strikes at expiration. Upside risk is unlimited above the upper break-even; downside risk grows below the lower break-even. For example, selling a $95 put for $3.00 and a $105 call for $3.00 creates a $6.00 credit. Break-even points at expiration are $89 and $111.
How to enter a short strangle
Submit a short strangle order to your broker, specifying both strikes, expiration, and a limit price for the combined credit. The order is filled when the market provides at least your limit credit. Opening the strangle credits your account with the total premium minus commissions.
How to exit a short strangle
Close the position before expiration by buying back both the put and the call. If the combined cost is less than the original credit, you keep the difference as profit. At expiration, assignment risk arises on either leg if the stock is beyond the corresponding strike.
The impact of time decay on a short strangle
Time decay generally benefits the short strangle seller when the underlying stays between the strikes. As expiration approaches, out-of-the-money extrinsic value declines on both legs. Rising implied volatility increases risk by making it more expensive to close the position before expiration.