A limited-risk, limited-reward strategy that profits when the underlying stays near the middle strike at expiry.
A Butterfly Spread is a neutral options strategy designed to profit when the underlying asset stays near a specific price at expiration. It combines two vertical spreads (a bull spread and a bear spread) sharing a common middle strike, creating a position with limited risk and limited reward.
The classic long butterfly with calls involves three strike prices: buy 1 lot at a lower strike, sell 2 lots at a middle strike, and buy 1 lot at a higher strike. All options share the same expiration date. The strikes are typically equally spaced (e.g., 100 points apart on Nifty).
Think of a butterfly as placing a bet that the underlying will "pin" to a specific price. The maximum profit occurs when the underlying closes exactly at the middle strike at expiration. As the price moves away from the middle strike in either direction, your profit decreases until you reach the breakeven points, beyond which you incur a loss limited to the net debit paid.
Butterflies are popular among experienced NSE traders during low-volatility, range-bound markets, especially when India VIX is below 14 and the market shows no clear directional bias heading into weekly or monthly expiry.
Lower Strike = Bought ITM call (e.g., 24,400 CE)
Middle Strike = Sold ATM calls x 2 (e.g., 24,500 CE)
Higher Strike = Bought OTM call (e.g., 24,600 CE)
Breakeven (Upper) = Higher Strike - Net Debit
Breakeven (Lower) = Lower Strike + Net Debit
Maximum profit at the middle strike (24,500). Loss is limited to the net debit paid, occurring below 24,400 or above 24,600.
Nifty is at 24,500. You expect it to stay near this level until Thursday expiry. India VIX is at 12.5.
Buy 1 lot 24,400 CE at ₹145 (ITM call, Delta ~0.65)
Sell 2 lots 24,500 CE at ₹85 each = ₹170 received (ATM calls)
Buy 1 lot 24,600 CE at ₹42 (OTM call, Delta ~0.30)
Net Debit: (145 + 42) - 170 = ₹17 per unit = ₹17 x 25 = ₹425 per butterfly
Max Profit: (24,500 - 24,400) - 17 = ₹83 per unit = ₹83 x 25 = ₹2,075 if Nifty closes at exactly 24,500
Max Loss: ₹425 (the net debit) if Nifty closes below 24,400 or above 24,600
Breakevens: 24,417 (lower) and 24,583 (upper)
Reward-to-Risk Ratio: 2,075 / 425 = 4.88 : 1
This excellent reward-to-risk ratio is why butterflies are attractive. However, the probability of Nifty closing exactly at 24,500 is low. The strategy works best when you expect range-bound action within a tight 200-point band.
Best deployed when India VIX is low (below 14) and you expect the market to remain range-bound. Low IV means cheaper options and less chance of a breakout.
When you believe Nifty or Bank Nifty will pin near a specific strike at expiry due to heavy open interest concentration at that level.
Butterflies work well 2-3 days before expiry when theta decay accelerates and the probability zone narrows. Weekly Nifty expiry on Thursday is ideal.
Avoid butterflies before RBI policy decisions, budget announcements, or earnings if trading stock options. These events can cause large moves that blow past your wings.
Butterflies require very low capital (just the net debit) compared to straddle/strangle selling which demands heavy margin. Great for small accounts.
Typical butterflies offer 3:1 to 5:1 reward-to-risk ratios. Even if you are right only 30% of the time, you can be profitable over multiple trades.
An iron butterfly combines a short straddle with protective wings. You sell 1 ATM call and 1 ATM put (same strike), then buy 1 OTM call and 1 OTM put for protection. Unlike the long butterfly which is a debit trade, the iron butterfly is a net credit trade.
Max Profit = Net credit received (if underlying closes exactly at the short strike)
Max Loss = Width of wing - Net credit received
Example: Sell 24,500 CE + Sell 24,500 PE, Buy 24,600 CE + Buy 24,400 PE. Net credit = ₹65. Max loss = 100 - 65 = ₹35 per unit.
Both strategies have the same payoff shape. The iron butterfly is a credit trade (you receive money upfront), while the long call/put butterfly is a debit trade. Iron butterflies are slightly easier to manage on NSE because the margin benefit of the protective wings reduces overall capital requirement.
Pro tip: Many traders prefer the iron butterfly because the credit received acts as a psychological cushion and the position is easier to roll or adjust.
Skip-strike butterfly where one wing is wider than the other. Reduces or eliminates cost on one side but adds directional risk on the other. Example: Buy 24,400 CE, Sell 2x 24,500 CE, Buy 24,700 CE.
If Nifty moves 50+ points from your middle strike, close the current butterfly and open a new one centered at the new expected pin level. Cost is typically small.
Use wider strikes (e.g., 200 points apart instead of 100) for a bigger profit zone but higher cost. Good when you are less certain about the exact pin level.
If the butterfly reaches 50-60% of max profit before expiry, consider closing early. The last few rupees of profit carry disproportionate risk as gamma increases near expiry.
The profit zone is very narrow. Even in a range-bound market, if Nifty oscillates between 24,350 and 24,650 but closes at 24,380, your butterfly centered at 24,500 will lose money. The underlying must close near your middle strike, not just stay range-bound.
While the max loss is indeed limited to the net debit, butterflies lose money more often than they win. The probability of max profit is very low. Think of butterflies as high reward-to-risk bets with low probability, not risk-free positions.
Holding until the very last moment exposes you to pin risk and execution risk. A profitable butterfly can turn into a losing one in the final minutes of trading. Exit at 50-70% of max profit rather than waiting for expiry.
At the same strikes and expiry, a call butterfly and put butterfly produce identical payoffs due to put-call parity. Choose based on liquidity and bid-ask spreads, not expected payoff differences.
A butterfly centered at ATM has near-zero Delta, making it a direction-neutral strategy. Delta only becomes significant if the underlying moves substantially away from the middle strike.
The butterfly benefits from time decay when the underlying is near the middle strike. The 2 short options decay faster than the 2 long options. Theta is your friend in this strategy.
Butterflies are short Vega. Rising implied volatility hurts the position because the short options gain more value than the long options. Enter when IV is elevated and expected to fall.
Negative Gamma near the middle strike. Near expiry, Gamma risk increases sharply. A sudden Nifty move of 100+ points near expiry can turn a profitable butterfly into a loss quickly.
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