Butterfly spread: options strategy explained
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
A butterfly spread is a limited-risk options strategy built from three strike prices in a 1-2-1 ratio. Traders buy one lower strike, sell two middle strikes, and buy one upper strike, all on the same expiry. The structure profits when the underlying settles near the middle strike at expiration.
What is butterfly spread?
A butterfly spread is a defined-risk options combination using three equally spaced strikes on the same underlying and expiry. The classic long call butterfly buys one in-the-money call, sells two at-the-money calls, and buys one out-of-the-money call, structured in a 1-2-1 ratio. The maximum profit occurs if the underlying closes exactly at the middle strike at expiration. Maximum loss is capped at the net debit paid to open the position. The same structure can be built with puts, producing an identical payoff profile, and variations include iron butterflies and broken-wing butterflies that alter the risk-reward geometry.
How traders use butterfly spread
Retail and institutional desks use butterfly spreads to express a precise view on where an underlying will settle, typically around a known event horizon such as an earnings release, a central bank decision, or an options expiration cycle. The structure is attractive because it is cheap to put on relative to its maximum payoff, often yielding multiples of the debit if price pins the middle strike. Institutional volatility desks use butterflies to harvest pinning behaviour around heavy open-interest strikes, particularly in index options near monthly expiry. Retail traders typically deploy them on liquid names with tight bid-ask spreads, since slippage on four legs can erode the edge. The position decays slowly until the final week, when gamma and theta sharpen significantly around the middle strike.
Worked example of a butterfly spread
Consider a stock trading at 100 ahead of a routine earnings release the desk expects to produce a muted reaction. A trader could buy one 95 call, sell two 100 calls, and buy one 105 call, all expiring the Friday after earnings. If the net debit is 1.20 per share, that is the maximum loss. Maximum profit, achieved only if the stock closes at exactly 100 at expiration, equals the wing width of 5 minus the debit, giving 3.80 per share. Break-evens sit at 96.20 and 103.80. Any close outside the 95 to 105 range produces the full debit loss.
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Frequently asked
What is the maximum loss on a butterfly spread?
The maximum loss on a long butterfly spread is the net debit paid to open the position, plus commissions. This loss occurs if the underlying settles at or below the lowest strike or at or above the highest strike at expiration. Because the position has defined risk on both wings, no margin call or assignment surprise can extend the loss beyond the premium paid, assuming all legs are held to expiration and not legged out of separately.
When does a butterfly spread make money?
A butterfly spread reaches maximum profit when the underlying closes exactly at the middle strike at expiration. It remains profitable within a band defined by the two break-even points, which sit between the wings and the middle strike. Outside that band, the position loses money up to the capped debit. Profitability also depends on implied volatility and time decay during the holding period, with the structure generally benefiting from declining volatility and the passage of time when the underlying sits near the middle strike.
What is the difference between a butterfly and an iron butterfly?
A standard butterfly is constructed entirely from calls or entirely from puts and is opened for a net debit. An iron butterfly combines a short at-the-money call and short at-the-money put with long out-of-the-money wings on each side, and is opened for a net credit. Both structures share the same payoff diagram at expiration, but the iron version uses both option types and the cashflow direction at entry is reversed, which affects margin treatment at most brokers.
Is a butterfly spread bullish or bearish?
A butterfly spread is neither directly bullish nor bearish; it is a neutral, range-bound strategy that profits from the underlying staying near a specific price. Traders can skew the structure by placing the middle strike above or below the current price, which introduces a directional bias. A broken-wing butterfly, where the two wings are unequal distances from the centre, further shifts the risk profile and can eliminate risk on one side at the cost of accepting greater risk on the other.
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