A straddle is an options position made of one call and one put on the same underlying, at the same strike and the same expiry. Buying both is a long straddle, a bet on a big move in either direction. Selling both is a short straddle, a bet that the price stays near the strike until expiry. On Nifty, the strike is usually the one closest to the current level.
A straddle is the simplest way to trade volatility rather than direction. The trader does not need to know whether Nifty will rise or fall. The long straddle needs the move to be large, the short straddle needs it to be small. Everything else is the same on both legs.
Long straddle
The buyer pays two premiums and owns the right to profit from a move either way. Loss is capped at the total premium paid. Profit is open-ended on the upside and large on the downside. The position loses value every day the index stays still, because theta is working against both legs at once.
Short straddle
The seller collects two premiums and keeps all of it if the index closes at the strike on expiry. Profit is capped at that premium. Loss is open-ended if the index runs hard in either direction, which is why the exchange asks for a large margin and why most sellers add a stop loss or convert the trade into an iron condor by buying wings.
A worked example
Suppose Nifty is at 22,000 on Monday. The 22,000 call for Thursday's expiry trades at ₹140 and the 22,000 put at ₹130. A long straddle costs 270 points. The upper breakeven is 22,270 and the lower is 21,730. If Nifty closes at 22,400, the call is worth 400, the put is worth nothing, and the buyer makes 130 points. If Nifty closes at 22,050, the buyer loses 220 of the 270 paid. The seller's results are the mirror image.
When each one makes sense
Long straddles suit event days such as the RBI policy, the Union Budget or a big earnings print, when a large move is likely but its direction is not. They work best when the India VIX is low, since premiums are cheap. Short straddles suit quiet, range-bound weeks, and are often placed on expiry day itself to collect fast time decay near the max pain strike.
Why it matters to a SAHI trader
Both legs must be placed and managed together. SAHI's option selling tools show the combined payoff, breakevens and Greeks for a straddle on one screen, so the trader sees the real risk of the pair rather than two separate positions.
FAQs
What is the difference between a straddle and a strangle?
A straddle uses one strike for both legs. A strangle uses two different strikes, a call above and a put below the current price, which makes it cheaper to buy but needs an even bigger move.
Which strike should a straddle use?
The at-the-money strike, the one nearest the current index level. That is where the call and put premiums are closest to equal.
Can a straddle lose money if the market moves?
Yes. A long straddle loses if the move is smaller than the total premium paid, and a short straddle loses if the move is bigger than the premium received.
Is a short straddle allowed for retail traders in India?
Yes, as long as the exchange margin is available in the trading account. The margin is high because the loss is not capped.