Vega trader

Short straddle

A short straddle is a two-legged, undefined-risk, neutral option strategy. You sell a call and a put with the same strike and expiration, collecting a net credit. The chart below shows a short straddle with call and put strike 100 at $5 each and the profit/loss diagram.

Orders(2)

Profit/Loss chart

At expiration Mark-to-market (model)
$-809.22$-552.65$-296.09$-39.53$217.04$473.60$730.17$986.73$1243.30 $83.50$87.17$90.83$94.50$98.17$101.83$105.50$109.17$112.83$116.50 $90.00$110.00
5% 150%
0 30

The smooth curve uses Black–Scholes (European-style, flat rate); adjust IV and time to explore sensitivity. Does not model dividends or early exercise.

1% 100%
Increases or decreases the price range on the chart for better overview

Greeks and this strategy

Greek How it behaves
Delta Near zero when centered at the strike. Moves positive or negative if the stock trends away from the strike.
Theta Positive. Time decay on both short legs benefits you when price stays near the strike.
Gamma Negative. Large moves in either direction shift delta against the position quickly.
Vega Negative. Falling implied volatility shrinks premiums and favors the short straddle seller.

Overview of short straddle

A short straddle combines a short call and a short put at the same strike price and expiration date. Maximum profit is limited to the net credit received. Losses can grow quickly if the underlying makes a large move in either direction. Each contract represents 100 shares of the underlying (relevant for the US market).

Market outlook for short straddle

Traders open a short straddle when they expect the underlying price to remain near the strike through expiration and implied volatility to decline. The strategy collects premium from both legs and benefits from time decay when the stock stays in a narrow range. Large moves in either direction create significant risk.

How to open a short straddle

Open the position by selling a call and a put at the same strike and expiration. Both orders are typically placed together as a single straddle order. The net credit received is the sum of both premiums. At-the-money strikes usually provide the highest combined premium.

Profit/loss diagram for a short straddle

Maximum profit equals the net credit received and is realized if the stock closes at the strike at expiration. Upside risk is unlimited above the upper break-even; downside risk grows as the stock falls below the lower break-even. For example, selling a $100 call for $5.00 and a $100 put for $5.00 creates a $10.00 credit. Break-even points at expiration are $90 and $110.

How to enter a short straddle

Submit a short straddle order to your broker, specifying the strike, expiration, and a limit price for the combined credit. The order is filled when the market provides at least your limit credit. Opening the straddle credits your account with the total premium minus commissions.

How to exit a short straddle

Close the position before expiration by buying back both the call and the put. If the combined cost is less than the original credit, you keep the difference as profit. At expiration, assignment risk arises if the stock is away from the strike and either leg is in the money.

The impact of time decay on a short straddle

Time decay generally benefits the short straddle seller when the underlying stays near the strike. As expiration approaches, extrinsic value declines on both options, which tends to reduce the cost of closing the position. Rising implied volatility increases risk by widening potential losses before expiration.