Short Strangle Explained
A short strangle sells an out-of-the-money call and put at once, collecting premium and winning as long as the underlying stays inside a wide range.
What it is
A short strangle sells one out-of-the-money call and one out-of-the-money put on the same underlying and expiration. You collect both premiums up front and keep them if the underlying finishes between the two short strikes. It is a pure short-volatility, range-bound trade with a wide profit zone and open-ended risk on both sides. Compared with a short straddle it collects less premium but gives a much wider band in which it wins; compared with an iron condor it collects more premium but gives up the defined-risk wings. It is the workhorse premium-selling structure on volatility desks.
Payoff at expiration
When to use it
Sell a strangle when implied volatility is high relative to its own history, so the premium is rich, and when you expect the underlying to stay range-bound with realised volatility coming in below implied. Desks put these on after a volatility spike they judge overdone, into a market with no imminent catalyst, at roughly 30 to 45 days so theta works hardest while gamma stays manageable. Because the risk is undefined, position size is the whole game: size for a tail move, not for the expected case, and avoid earnings and macro events that can gap the underlying through a strike.
Greeks profile
| Delta | Near zero at entry, the trade is direction-neutral and built to profit from a range. |
| Gamma | Short gamma. Losses accelerate as the underlying approaches either short strike. |
| Theta | Positive. Every calm day pulls premium out of both short options in your favour. |
| Vega | Short vega. A drop in implied volatility helps; a spike hurts even if price has not moved. |
Max profit, max loss & break-evens
Max profit = total credit received, kept if the underlying finishes between the two short strikes. Undefined. Loss grows without limit above the call strike and down to the put strike toward zero. Lower BE = short put strike − total credit · Upper BE = short call strike + total credit
Concrete example
A stock trades at 100. You sell the 110 call for 2 and the 90 put for 2, collecting 4. You keep the full 4 if the stock finishes anywhere between 90 and 110, a wide 20 percent band, with break-evens at 86 and 114. If the stock gaps to 120, the call is 10 in-the-money against your 4 credit, a 6-point loss and climbing, which is why undefined-risk sellers manage before the move, not after.
Risks & management
The undefined risk on both sides is the whole story: a sharp move or a volatility spike can produce a loss far larger than the credit. Manage before expiry, not at it. A common discipline is to take profit around half the credit, roll the tested side out and away when the underlying reaches a short strike, and cut the trade when the loss reaches roughly one to two times the credit collected. Never hold a short strangle through an event that can gap the underlying, and convert to an iron condor by buying wings if you want to define the risk.
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