Butterfly Spread Bankex: Setup, Payoff and Risk Guide

The this strategy differs from the iron condor in an important way: rather than offering a wide profit zone between two short strikes, the butterfly spread Bankex concentrates its maximum profit in a narrow band around a single centre strike. This makes it a higher precision, generally lower cost strategy, but one that requires the index to land close to a specific level rather than simply staying within a broader range.

Because Bankex only trades monthly contracts, the the position requires the index to be near the chosen centre strike specifically at the monthly expiry, which is a longer and less certain prediction window than a Nifty 50 weekly butterfly would require.

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What Is the Butterfly Spread Bankex?

The this trade uses three strikes and four option legs, all on the same monthly expiry. It can be constructed with calls or puts; a call butterfly is the more commonly used version.

The four legs of a call butterfly spread Bankex are:

• Buy one call at the lower strike
• Sell two calls at the middle (centre) strike
• Buy one call at the higher strike

The lower and higher strikes are equidistant from the centre strike. The net debit paid is the maximum loss for the this options approach, and the maximum profit is realised when the index closes exactly at the centre strike at the monthly expiry, though a meaningful profit zone exists around that centre point as well.

How Does the Butterfly Spread Bankex Work?

With Bankex at Rs 59,500, a the spread might use 59,150 as the lower strike, 59,500 as the centre strike, and 59,850 as the higher strike, all equidistant. The position profits most if Bankex closes very close to 59,500 at the monthly expiry.

Parameter	Details
Index	BSE Bankex (BSE)
Expiry	Monthly only, last Thursday of the month. Effective September 2025 (NSE and BSE index expiry swap). Weekly contracts discontinued November 2024.
Lot Size	15 units (effective from January 2026 per NSE circular, reduced from 20)
Strategy Type	Neutral, pinned to a specific level, defined risk
Legs	4 (1 long lower call, 2 short centre calls, 1 long higher call)
Max Profit	Distance between strikes minus net debit, times lot size, at the centre strike
Max Loss	Net debit paid at entry, times lot size
Margin	Varies dynamically. Check live margin on your broker's calculator before placing any order.

Butterfly Spread Bankex: Step by Step Setup

1. Identify the centre strike for the this strategy. With Bankex at Rs 59,500, a centre strike near the current ATM level of 59,500 is common, though the centre strike can also be placed away from ATM to express a specific directional pinning view.
2. Select the equidistant lower and higher strikes. The distance between the centre strike and each outer strike, referred to as the wing width, determines both the maximum profit and the net debit required for the butterfly spread Bankex.
3. Buy one lower strike call, sell two centre strike calls, buy one higher strike call. All four legs of the the position should be placed together, ideally as a single combined order to minimise legging risk.
4. Calculate the net debit and maximum profit. Maximum profit for the butterfly spread Bankex equals the wing width minus the net debit, multiplied by 15 units, realised at the centre strike.
5. Set an exit plan before confirming the this trade order. Because maximum profit is concentrated in a narrow zone, decide in advance whether you will hold to expiry or take a partial profit if the index approaches the centre strike before then.

Illustrative Payoff: Butterfly Spread Bankex

Illustrative example for educational purposes only. Strikes, premiums and calculations are hypothetical and should not be interpreted as a trade recommendation.

Hypothetical setup: Buy 59,150 CE, sell two 59,500 CE, buy 59,850 CE. Net debit: Rs 70 per unit. Lot size: 15 units. Wing width: 350 points.

Bankex at Monthly Expiry	P&L Per Unit (Rs)	P&L Per Lot (15 units, Rs)	Outcome
At or below 59,150	-70	-1,050	Max loss; all calls expire worthless or offset
59,500 (centre strike)	+280	+4,200	Max profit
At or above 59,850	-70	-1,050	Max loss; wings fully offset

The this options approach profit zone narrows sharply away from the centre strike. Unlike the iron condor's wider plateau, the butterfly spread Bankex payoff peaks at a single point and declines on either side, reaching maximum loss at or beyond the outer wing strikes.

Greeks for the The spread

Delta: The butterfly spread Bankex is close to delta neutral when the index is at the centre strike, developing directional delta as the index moves toward either wing.

Gamma: The butterfly spread Bankex carries negative gamma near the centre strike as expiry approaches, meaning the position becomes more sensitive to further movement precisely at the point where the trader wants the index to stay pinned.

Theta: Theta is generally positive for the butterfly spread Bankex when the index is near the centre strike, since the two short options at that strike decay faster than the two long wing options.

Vega: The butterfly spread Bankex is generally short vega near the centre strike, meaning a rise in implied volatility after entry tends to work against the position if the index is trading near that strike.

When the Butterfly Spread Bankex May Be Considered

The butterfly spread Bankex may be considered when a trader has a specific view that the index will pin near a particular level by the monthly expiry, often based on options derived reference points such as max pain, or when implied volatility is elevated and expected to decline as the index consolidates toward a specific level.

When NOT to Use the Butterfly Spread Bankex

Consider avoiding the butterfly spread Bankex when you have only a general rangebound view rather than a specific target level, in which case an iron condor's wider profit zone may be more appropriate; the index is likely to trend strongly in one direction; or the wing strikes available do not offer an attractive net debit relative to the potential profit.

Risk Management

The butterfly spread Bankex has defined risk limited to the net debit paid. Because the profit zone is narrow, many traders consider taking partial profits if the index approaches the centre strike before expiry, rather than holding for the theoretical maximum, which requires landing very close to that exact level.

Transaction Costs

The butterfly spread Bankex involves four separate option legs, which can mean higher cumulative transaction costs relative to the typically modest net debit paid. Brokerage, exchange transaction charges, STT, GST, SEBI charges, stamp duty, and bid ask spread impact across four legs should be weighed carefully against the potential profit.

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Butterfly Spread vs Other Bankex Neutral Strategies

Strategy	Market View	Max Profit	Max Loss	Profit Zone	Complexity
Butterfly Spread	Pinned to one price	Defined (at centre strike)	Defined (net debit)	Narrow zone at centre	Medium High
Iron Condor	Rangebound	Defined (net credit)	Defined (spread minus credit)	Wide zone between two short strikes	Medium
Calendar Spread	Pinned near one strike, over two expiries	Depends on far month IV	Defined (net debit)	Narrow, near shared strike	Medium High

The butterfly spread Bankex offers a narrower but potentially higher precision profit zone compared with the iron condor's wider plateau. The appropriate choice depends on whether the trader has a general rangebound view or a specific target level for Bankex.

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Conclusion

The butterfly spread Bankex is a defined risk strategy suited to a precise view that the index will pin near a particular level by the monthly expiry, offering a typically lower net debit than a comparable iron condor in exchange for a narrower profit zone. Because Bankex only trades monthly contracts, this pinning view must hold over a full month rather than a single week. Always verify current lot size (15 units from January 2026) and expiry schedule on NSE before executing any trade.

Frequently Asked Questions

What is the butterfly spread Bankex?

Ans. The butterfly spread Bankex is a three strike, four leg options strategy that buys one lower strike call, sells two centre strike calls, and buys one higher strike call, all on the same monthly expiry. Maximum profit occurs when the index closes exactly at the centre strike.

What is the maximum loss in the butterfly spread Bankex?

Ans. The maximum loss is the net debit paid at entry, multiplied by the 15 unit lot size, occurring if the index closes at or beyond either outer wing strike.

What is the maximum profit in the butterfly spread Bankex?

Ans. The maximum profit equals the wing width (distance between the centre strike and either outer strike) minus the net debit, multiplied by the lot size, realised only when the index closes exactly at the centre strike.

How does the butterfly spread Bankex differ from an iron condor?

Ans. The butterfly spread Bankex concentrates maximum profit at a single centre strike with a narrow profit zone, while the iron condor offers a wider plateau of maximum profit between two separated short strikes.

Does Bankex have weekly options for the butterfly spread?

Ans. No. Weekly options on Bankex were discontinued in November 2024. The butterfly spread Bankex uses only the monthly contract.

What is the current lot size for Bankex options?

Ans. The Bankex lot size is 15 units effective from January 2026, reduced from 20. Always verify the current lot size on nseindia.com.

Is the butterfly spread Bankex suitable for beginners?

Ans. The butterfly spread Bankex involves four legs and requires understanding of how the profit zone narrows away from the centre strike, making it better suited to traders with some prior options experience rather than complete beginners.