Butterfly Spread

butterflyfly spreadlong butterfly

A butterfly spread is an options strategy using three strike prices that profits when the underlying stock is at the middle strike at expiration, offering defined risk and limited reward.

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Analysis from Apr 18, 2026

What Is a Butterfly Spread?

A butterfly spread is a three-strike options strategy that uses four contracts to create a position with limited risk and limited reward, designed to profit from the underlying stock being near a specific price at expiration. It can be constructed with all calls, all puts, or a combination (iron butterfly).

The structure involves buying one option at a lower strike, selling two options at a middle strike, and buying one option at an upper strike. All options share the same expiration date, and the strikes are equidistant.

Why Butterfly Spreads Matter

Butterflies offer a unique risk/reward profile among options strategies:

Very low cost: A typical butterfly can be entered for $0.50-$2.00 per spread, meaning maximum loss is very small in absolute terms
High reward-to-risk ratio: Maximum profit can be 3x-10x the cost of the spread, depending on the width of the strikes
Capital efficiency: Because the cost is low, multiple butterflies can be used across different price targets or different stocks without committing large amounts of capital
Precision tool: Butterflies are useful when you have a specific price target rather than just a directional bias

Butterfly Spread Variations

Type	Construction	Best For
Long call butterfly	Buy 1 lower call, sell 2 middle calls, buy 1 upper call	Bullish to neutral with specific target
Long put butterfly	Buy 1 upper put, sell 2 middle puts, buy 1 lower put	Bearish to neutral with specific target
Iron butterfly	Sell ATM straddle, buy OTM strangle	Income generation with defined risk
Broken-wing butterfly	Unequal wing widths	Directional bias with reduced cost on one side

Practical Applications

The most common use of butterflies among active traders is the "expiration butterfly" or "lotto butterfly." On the day of or day before expiration, a narrow butterfly centered at the expected closing price can be purchased for $0.20-$0.50 with a maximum payoff of $2.00-$5.00. While the win rate is low (roughly 10-20%), the favorable risk/reward makes it a positive expected-value trade when the center strike is intelligently selected.

Another application is the "earnings butterfly." If you believe a stock will react neutrally to earnings (staying near the current price), an iron butterfly centered at the current price captures elevated pre-earnings premium while defining maximum risk.

Frequently Asked Questions

▶How does a butterfly spread work?

A long call butterfly involves: buying 1 lower-strike call, selling 2 middle-strike calls, and buying 1 upper-strike call, all at the same expiration. The strikes are equidistant (e.g., 95/100/105). The strategy costs a small net debit and profits maximally when the stock expires exactly at the middle strike. For example: buy 1 $95 call at $7, sell 2 $100 calls at $4 each ($8 total received), buy 1 $105 call at $2. Net cost: $1 (or $100 per spread). Max profit at $100 at expiration: $4 ($400 per spread). Max loss: $1 ($100). This creates a favorable risk/reward with pinpoint profit potential.

▶When is a butterfly spread most useful?

Butterfly spreads work best when you have a specific price target and expect low volatility. They are most commonly used: around options expiration to bet on a specific closing price ("pinning"), as cheap event bets when you have a precise forecast of the post-event price, and as alternatives to iron condors when you want an even more capital-efficient defined-risk structure. The key advantage is the very low cost (and therefore low maximum loss) relative to the potential profit. However, the narrow profit zone means the strategy requires precision and has a relatively low win rate.

▶What are the risks of a butterfly spread?

The primary risk is that the stock moves significantly away from the middle strike, causing the spread to expire worthless. Because butterflies have a narrow profit zone, they lose money most of the time. The strategy is also subject to early assignment risk on the short calls (for call butterflies) when deep ITM. Liquidity can be an issue because the three-leg structure may have wide bid-ask spreads, especially in less liquid options. Pin risk near expiration is another concern: if the stock is near the short strike at expiration, it is uncertain whether the short options will be assigned. The maximum loss is limited to the net premium paid.

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