⚡ Straddles and strangles: trading the size of the move

🎯 In 30 seconds: A long straddle is a call and a put at the same strike. A long strangle uses a higher call and a lower put. Both make money if the market moves far enough in either direction, and lose the premium if it does not. Selling them is the opposite bet: you collect premium and hope for calm, with losses that can be very large. Option prices already include the move the market expects, so the real question is always whether the move will be bigger or smaller than that.

Direction does not matter, size does

Most option trades are about where the price goes. Straddles and strangles are about how far it goes. You might expect a big move from quarterly results, an RBI policy decision, the Union Budget or election results, without knowing whether the news will be good or bad.

Think of a cricket fan betting on a match where rain is forecast. One fan does not care who wins. He only bets that the match will have a result rather than be washed out. The bookmaker knows about the forecast too, and has already shortened the odds. That is the problem with event trades: everyone can see the calendar.

Long straddle: the payoff

Same hypothetical Nifty 50 level of 25,000 and 14-day chain as in Vertical spreads, from a Black-Scholes model at 13% volatility. One lot is 65 units for contracts from January 2026 (NSE circular, 3 October 2025). Check the current lot before trading.

Buy the 25,000 call for 286 and the 25,000 put for 224. Total cost: 510 points, or ₹33,150 per lot. Since February 2025, SEBI requires brokers to collect option premium from buyers upfront, so the full ₹33,150 is blocked when you buy.

• Max loss = total premium = ₹33,150, if the Nifty settles exactly at 25,000.
• Upper breakeven = strike + premium = 25,510.
• Lower breakeven = strike - premium = 24,490.
• Max profit = unlimited on the upside. On the downside, large but limited because the index cannot go below zero.

Long strangle: cheaper, needs more

Buy the 25,200 call for 192 and the 24,800 put for 143. Total cost: 335 points, or ₹21,775.

• Max loss = ₹21,775, anywhere from 24,800 to 25,200.
• Upper breakeven = call strike + premium = 25,200 + 335 = 25,535.
• Lower breakeven = put strike - premium = 24,800 - 335 = 24,465.

The strangle loses less when nothing happens. The straddle makes more when something does. Which is "better" depends on the prices on the day, not on a rule.

The implied move: what the market already expects

The price of the at-the-money straddle is a quick estimate of the move the market expects by expiry. Here 510 points on a 25,000 Nifty is about 2%. Traders call this the implied move.

That number is the bar you have to clear. Buying a straddle is not a bet that the Nifty moves. It is a bet that it moves more than about 2% in 14 days. Selling one is a bet that it moves less. The market has already priced the move it expects, so neither side is free money.

The implied move comes from implied volatility (see Implied volatility and India VIX). India VIX, which NSE computes from Nifty option prices, is a quick read of the 30-day expected volatility. When it is high, straddles are expensive and the bar is high. When it is low, they are cheap and the bar is low.

Results day and IV crush, worked through

Before a company's quarterly results, implied volatility on its near-term options usually rises, because a jump is coming. After the results are out, the uncertainty is gone and implied volatility usually drops sharply. Traders call this IV crush. It hits every option you hold at once.

Hypothetical example. Sharma Foods Ltd is at ₹1,000 and the board meets to approve results after market hours today. The lot is a made-up 500 shares. The 1,000 straddle with five days to expiry costs ₹56 (implied volatility of 60%), an implied move of about 5.6%. You buy one lot for ₹28,000.

The next morning the share opens at ₹1,040. You were right that it moved. But implied volatility has fallen to 25%. The 1,000 call is now worth about ₹41.45, almost all of it intrinsic value. The put is worth about 75 paise.

Your straddle is worth about ₹42.20, a loss of about ₹6,900 per lot, even though the share moved 4%. The market expected 5.6%. You needed a move bigger than the one already in the price.

If you held this stock straddle to expiry instead, the in-the-money leg would be exercised and physically settled: a call means taking delivery of 500 shares, a put means delivering them. Close stock straddles before expiry unless you want that.

Index event days in India

The same logic applies to the Nifty around scheduled events. Implied volatility tends to rise before them and fall after:

• RBI monetary policy announcements, which come on scheduled meeting dates.
• The Union Budget, presented once a year on a date announced in advance.
• General and major state election results.
• Big overnight global events, such as US inflation or interest rate decisions, which land while Indian markets are closed and show up as a gap at 9:15 IST.

Sometimes the realised move is far bigger than the implied one. On 4 June 2024, the general election results day, the Nifty 50 closed 1,379.40 points lower, a fall of about 5.9%. A long straddle bought the day before made money that day. A short straddle on the same strikes lost many times the premium it had collected.

Short straddles and strangles: selling the calm

Selling a straddle or strangle flips the payoff. You receive the premium and keep it if the index stays near the strike or between the strikes.

• Short straddle (sell the 25,000 call and put, receive 510 points): max profit ₹33,150 at exactly 25,000, breakevens 24,490 and 25,510.
• Short strangle (sell the 25,200 call and 24,800 put, receive 335 points): max profit ₹21,775 between 24,800 and 25,200, breakevens 24,465 and 25,535.
• Max loss for both: unlimited on the upside, very large on the downside.

A 1,500-point fall (6%) costs the short straddle (1,500 - 510) x 65 = ₹64,350 per lot, nearly twice the most it could ever have earned. The trade makes small, frequent gains and occasional large losses. That pattern can look safe for months. That feeling is not evidence.

Why "unlimited risk" is not just a phrase

• Gaps. The Nifty can open far from the previous close after overnight news. You cannot close while the market is shut, and a stop-loss order fills at the next available price, not your trigger. See Stop losses.
• Margin. Two naked short legs need SPAN plus extreme loss margin (2% of notional for each short index option, per NSE). On a 25,000 Nifty the ELM alone is about ₹65,000 for one lot of each leg, and on expiry day SEBI adds another 2% on short index options. When the market moves against you, SPAN rises at the worst moment, and if you cannot add money your broker can close the position at a bad price.
• Volatility spikes. On a big down day, implied volatility usually jumps too. Your short options lose value from both the move and the higher volatility at once.
• Size creep. Because each win is small, sellers often add lots to make the income "worth it". That multiplies the eventual loss.

Greeks in one paragraph

A long straddle starts with delta close to zero, so small moves barely matter. It has positive gamma, meaning it gains delta as the market moves, in whichever direction. It has positive vega, so rising implied volatility helps and IV crush hurts. And it has negative theta: it loses time value every day. A short straddle has all four reversed. See The Greeks.

Costs and tax, briefly

STT is 0.15% of the premium when you sell an option, and 0.15% of the intrinsic value when an option is exercised at expiry, payable by the buyer, from 1 April 2026 (NSE circular, March 2026). Two legs mean two sets of brokerage and charges. Profits and losses from options are generally taxed as business income. See Taxes for traders and investors in India and check with a chartered accountant.

Try it

1. Find an F&O stock whose board meeting for results is in the next two weeks, using the NSE or BSE corporate announcements page.
2. The day before results, write down the at-the-money straddle price for the expiry just after the results, and divide by the share price to get the implied move.
3. Look up how far the share moved on the day after its last four results (from NSE's historical price data). Were those moves bigger or smaller than today's implied move?
4. Record the straddle's price the morning after results. Did IV crush outweigh the move?
5. Do the same for the Nifty before the next RBI policy announcement, using India VIX as a second check.

Sources

• SEBI circular, 1 October 2024: Measures to strengthen equity index derivatives framework (upfront premium, expiry-day ELM)
• NSE: Margins in equity derivatives
• NSE circular, 3 October 2025: Revision in market lot of derivative contracts on indices
• NSE: India VIX computation methodology
• Free Press Journal (4 June 2024): Sensex and Nifty fall on Lok Sabha election results day
• SEBI (August 2026): Profitability of individual traders in the equity derivatives segment, FY25 to FY26
• NSE circular, 31 March 2026: Changes in rates of Securities Transaction Tax