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The exact mirror image of a Synthetic Long Stock position: a two-leg options combination that recreates shorting the underlying, with the same simple, straight-line payoff — just inverted.

A Synthetic Short Stock combines selling one call and buying one put, at the same strike (typically at-the-money) and the same expiry. This replicates shorting the underlying almost exactly: profit rises point-for-point as the underlying falls, and losses grow point-for-point as it rises — the same linear relationship an actual short position has, without needing to borrow and sell the underlying itself.

This is the exact reverse of a Synthetic Long Stock position — sell the call instead of buying it, buy the put instead of selling it. The same put-call parity relationship that gives the long version its straight-line payoff applies here too, just flipped.

Like its long counterpart, this has the simplest payoff shape on this site: no flat zone, no cap, no kink at any strike. The position's value moves in an unbroken straight line opposite the underlying — a fall of X points is a gain of roughly X points; a rise of X points is a loss of roughly X points, all the way up.

A Synthetic Short Stock position fits situations where you want direct, linear downside exposure without the operational complexity of actually shorting the underlying (borrowing shares, margin requirements specific to short-selling, and so on). It's also used when a trader wants to hedge an existing bullish position elsewhere in their portfolio with a clean, simple, linear offset rather than a capped or zone-based options position.

Suppose Nifty is trading at 24,000 with a weekly expiry coming up, and lot size is 65. You want direct downside exposure without shorting the underlying itself.

1. Confirm the setup. You want Nifty exposure that behaves like being short it.
2. Sell 1 call at the 24,000 strike (at-the-money), collecting a premium of 145.
3. Buy 1 put at the same 24,000 strike for a premium of 140.
4. Calculate the net credit: 145 − 140 = 5 points, or ₹325 at this lot size — a small amount received upfront, since the two premiums mostly offset each other.
5. Calculate the breakeven: 24,000 + 5 = 24,005.
6. Understand the shape: below 24,005, every further point of Nifty fall is a further point of profit. Above it, every point of Nifty gain is a further point of loss, with no cap.
7. See how it resolves at expiry:
   • Nifty finishes at 23,000 → profit is roughly (24,005−23,000) × 65 = ₹65,325.
   • Nifty finishes at 24,005 → you exactly break even.
   • Nifty finishes at 25,000 → loss is roughly (25,000−24,005) × 65 = ₹64,675.

Quick reference for the same trade:

Based on the worked example above. A single straight line, sloping the opposite way from a Synthetic Long Stock position. Move the cursor over the chart to see profit/loss at any price.

• This carries genuinely unlimited risk — the same uncapped exposure real short-selling has, since there's no ceiling on how high the underlying can rise before expiry.
• Margin requirements reflect the short call's obligation and are generally substantial, mirroring real short-selling margin.
• Index options on NSE are typically European-style and cash-settled — no early-assignment risk on the short call leg.