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A two-leg options strategy that collects the largest possible credit for a bet that the underlying barely moves — the tightest, highest-premium version of a range-bound trade, with undefined risk on both sides.

A Short Straddle combines selling one call and selling one put, both at the same strike (almost always at-the-money) and the same expiry. This is what separates it from a Short Strangle, which uses two different, further-apart strikes — a straddle is the tighter, more concentrated version, collecting more premium for a narrower range of safety.

Using the same strike for both legs is what makes this a straddle rather than a strangle. It maximizes the premium collected (since at-the-money options carry the most extrinsic value) but also means the breakevens sit closer to the current price than a strangle's would — you have less room for the underlying to move before the position starts losing.

Like a Short Strangle, this strategy profits from time decay while the underlying stays close to the strike. The difference is how narrow that "close" actually is:

1. Right at the strike — maximum profit. Both options expire worthless, and you keep the full credit.
2. Moving away from the strike in either direction — profit shrinks steadily as one side of the position gains intrinsic value, crossing into a loss once either breakeven is passed.
3. Beyond either breakeven — loss grows point-for-point with the underlying, with no cap on either side.

Because both breakevens are calculated from the same central strike (strike − credit, and strike + credit), the profitable zone is a single, symmetric range centered exactly on the strike — narrower than a comparable strangle's, since a strangle's two different strikes push the safe zone wider to begin with.

A Short Straddle fits a view that the underlying will be unusually quiet — more so than a Short Strangle requires, since the profitable range is narrower. It's typically used when implied volatility is elevated and a trader expects it to collapse (a classic "volatility crush" trade around an event that's now passed), or simply when a trader has high conviction the underlying will stay pinned near current levels through expiry.

Suppose Nifty is trading at 24,000 with a weekly expiry coming up, and lot size is 65. You expect it to stay very close to this level.

1. Confirm the setup. You expect Nifty to stay pinned near 24,000, tighter than a typical range-bound view.
2. Sell 1 call at the 24,000 strike, collecting a premium of 145.
3. Sell 1 put at the same 24,000 strike, collecting a premium of 140.
4. Calculate the net credit: 145 + 140 = 285 points, or ₹18,525 at this lot size — notably larger than the Short Strangle example's credit, since at-the-money options carry more premium than the out-of-the-money ones used there.
5. Max loss: undefined, same as a Short Strangle — no protective long legs on either side.
6. Calculate the breakevens: 24,000 − 285 = 23,715 on the downside, and 24,000 + 285 = 24,285 on the upside.
7. Hold the position while Nifty stays close to 24,000.
8. See how it resolves at expiry:
   • Nifty finishes exactly at 24,000 → both legs expire worthless, you keep the full ₹18,525 credit.
   • Nifty finishes between the strike and either breakeven → still profitable, just less than the maximum.
   • Nifty finishes beyond either breakeven → a loss that keeps growing the further it moves, with no cap.

Quick reference for the same trade:

Based on the worked example above. Move the cursor over the chart to see profit/loss at any price.

• Loss is genuinely undefined — same core risk as a Short Strangle, but with a narrower safety margin, since both breakevens sit closer to the current price.
• Margin requirements are typically high, reflecting the undefined risk on both sides — expect this to tie up meaningfully more capital than a defined-risk position.
• A gap move can be especially damaging. Because the profitable zone is narrow, even a moderate overnight gap can push the underlying straight through a breakeven with no chance to react.
• Index options on NSE are typically European-style and cash-settled — no early-assignment risk on either short leg, unlike American-style stock options.