Glossary term
Butterfly Spread
A butterfly spread is a defined-risk options strategy that combines long and short options at three strike prices around a target price.
Updated
Read time
What Is a Butterfly Spread?
A butterfly spread is a defined-risk options strategy that combines long and short options at three strike prices around a target price. A standard long butterfly is designed to benefit when the underlying asset finishes near the middle strike at expiration, while limiting both maximum gain and maximum loss.
The strategy can be built with calls or puts. A common long call butterfly buys one lower-strike call, sells two middle-strike calls, and buys one higher-strike call with the same expiration. The middle strike is the body of the butterfly; the lower and higher strikes are the wings.
Key Takeaways
- A butterfly spread uses three strike prices and multiple option legs.
- A long butterfly is usually a limited-risk, limited-reward, range-bound strategy.
- The best outcome often occurs near the middle strike at expiration.
- Calls or puts can be used to create economically similar butterfly structures.
- Commissions, bid-ask spreads, early assignment, and execution quality can materially affect results.
Basic Structure
Leg | Role in a long call butterfly |
|---|---|
Buy 1 lower-strike call | Creates upside participation above the lower strike. |
Sell 2 middle-strike calls | Creates the body and helps finance the spread. |
Buy 1 higher-strike call | Caps risk above the upper strike. |
All legs normally share the same expiration. The strikes are often evenly spaced, though variations such as broken-wing butterflies use uneven spacing to change the risk and reward profile.
Payoff Logic
A long butterfly has its highest value when the underlying finishes at or near the middle strike at expiration. If the underlying finishes far below the lower strike, the options may expire worthless and the trader loses the net debit paid. If the underlying finishes far above the upper strike, gains and losses across the legs offset, again leaving the trader with a limited result.
The strategy is therefore not simply bullish or bearish. It is often a targeted price strategy. The trader is expressing a view about where the underlying may land, how much it may move, and whether the option pricing makes the defined payoff attractive.
Risk Profile
The maximum risk in a standard long butterfly is generally the net debit paid, plus commissions and fees. The maximum profit is limited and depends on the distance between strikes minus the net cost. Real-world results can differ because options may be closed before expiration, spreads may be wide, and American-style options can introduce early assignment risk on short legs.
Short butterflies reverse the profile. They may benefit from a larger move away from the middle strike, but the risk and margin treatment can be very different. Traders should understand which version they are using before relying on the name alone.
Execution Considerations
Butterflies are multi-leg trades, so execution quality matters. A strategy that looks attractive at mid-market prices may be far less attractive after bid-ask spreads and commissions. Liquidity in each leg, strike spacing, expiration selection, and order routing can all change the practical economics.
Because the payoff is narrow, butterflies can be unforgiving if the trader is right about direction but wrong about timing or final price. The strategy often requires a more precise thesis than simply expecting a stock to rise or fall.
Risk management also includes knowing the exit plan. Some traders close the spread before expiration to avoid assignment or pin risk, while others hold for the targeted expiration payoff.
Investor Takeaway
A butterfly spread is a structured options trade around a target price. It can define risk and reduce upfront cost compared with buying a single option, but it also limits upside and adds complexity. The strategy works only when the price target, expiration, volatility assumptions, and execution costs all fit together.