What is a Butterfly Spread?
A standard Long Call Butterfly uses three strikes with equal spacing.
Creates upside exposure from the lower strike.
Creates the profit peak around the target price and helps finance the trade.
Caps risk above the upper strike.
When to use it
| Situation | Fit? | Why |
|---|---|---|
| Expect stock near a specific target at expiration | Good fit | Maximum profit occurs near the middle strike. |
| Expect low or declining volatility | Potentially favorable | The strategy benefits when price stays contained. |
| Want low-cost defined-risk exposure | Good fit | Net debit is often relatively small. |
| Expect a huge breakout | Poor fit | Profit falls once price moves beyond the target zone. |
| Do not have a price target | Harder to use well | The strategy is very sensitive to where the stock finishes. |
Worked example
Assume a stock trades near $100 and you believe it may finish near $105 at expiration.
| Leg | Action | Strike | Example Premium |
|---|---|---|---|
| 1 | Buy 1 Call | $100 | Pay $6.00 = -$600 |
| 2 | Sell 2 Calls | $105 | Receive $3.50 each = +$700 |
| 3 | Buy 1 Call | $110 | Pay $1.50 = -$150 |
Maximum profit, loss, and break-even
Where is maximum profit?
Maximum profit occurs if the stock finishes exactly at the middle strike at expiration.
At $105, the lower $100 call is worth $5, while the $105 and $110 calls have no intrinsic value. After subtracting the $0.50 net debit, the spread earns its maximum profit.
What happens at expiration?
| Stock Price | Approximate Outcome | Meaning |
|---|---|---|
| $95 | -$50 max loss | All calls expire worthless. |
| $100 | -$50 max loss | Lower call is at the strike. |
| $100.50 | Lower break-even | Intrinsic value equals the debit paid. |
| $103 | Partial profit | The lower call gains value as price moves toward the middle strike. |
| $105 | +$450 max profit | Ideal expiration point. |
| $108 | Partial profit | Profit decreases as price moves above the target. |
| $109.50 | Upper break-even | Net profit falls back to zero. |
| $110 or higher | -$50 max loss | The spread reaches equal intrinsic value on both sides; only the debit remains lost. |
Why the payoff looks like a butterfly
Profit increases as the stock moves from the lower strike toward the middle strike, peaks at the middle strike, then falls as the stock moves toward the upper strike.
Butterfly Spread vs. Iron Condor
| Feature | Butterfly Spread | Iron Condor |
|---|---|---|
| Best market view | Stock near one specific target | Stock stays inside a broader range |
| Profit zone | Narrower | Wider |
| Maximum profit location | Near middle strike | Anywhere between short strikes |
| Typical opening cash flow | Often a debit | Often a credit |
| Risk | Defined | Defined |
Butterfly Spread vs. Iron Butterfly
| Feature | Long Call Butterfly | Iron Butterfly |
|---|---|---|
| Typical opening cash flow | Debit paid | Credit received |
| Core objective | Low-cost target-price trade | Premium income around a target price |
| Maximum profit | At middle strike | At middle strike |
| Risk | Defined | Defined |
| Complexity | 4 call contracts | Call spread + put spread |
How to choose strikes
| Choice | Typical Effect |
|---|---|
| Middle strike near your expected target | Centers maximum profit at your forecast price. |
| Narrow wings | Lower capital at risk, but smaller profit zone. |
| Wider wings | Potentially larger max profit, but typically higher debit and wider exposure. |
Expiration matters a lot
A Butterfly Spread is highly sensitive to where the stock finishes at expiration.
Shorter expirations can make the payoff more precise, while longer expirations give more time for the stock to move but can change pricing and sensitivity.
Pros and cons
- Very low defined maximum loss in many setups.
- Potentially attractive reward relative to debit.
- Useful when you have a specific target price.
- Risk is capped on both sides.
- Can be cheaper than buying a single call.
- Maximum profit occurs in a narrow area.
- Requires good timing and price-target accuracy.
- Four contracts increase complexity.
- Assignment risk can arise on the short calls.
- Profit can disappear if price moves too far beyond the target.
How to close it
A Long Call Butterfly is generally opened for a debit and can be closed by selling the complete butterfly for a credit.
Close: Sell the full butterfly as one multi-leg order.
You do not need to hold to expiration. If the stock approaches the middle strike and the spread has appreciated, you can close early.
Assignment and expiration risk
The two short middle-strike calls can be assigned, especially if they become in the money near expiration. Because the position includes long calls on both sides, total risk remains structurally limited, but expiration can create operational complexity.
Common mistakes
- Choosing the middle strike without a realistic price target.
- Holding too long after the spread has already gained substantially.
- Assuming the stock only needs to stay “in the range.”
- Ignoring that maximum profit is concentrated near one price.
- Using illiquid options with wide bid/ask spreads.
- Holding through expiration without understanding assignment and exercise.
Beginner checklist
| Check | Question |
|---|---|
| ☐ Target price | What price do I realistically expect at expiration? |
| ☐ Middle strike | Is the middle strike close to that target? |
| ☐ Wing width | How much risk and reward do the outer strikes create? |
| ☐ Net debit | What is my exact maximum loss? |
| ☐ Break-evens | What is the profitable range at expiration? |
| ☐ Expiration | Does the timing match my target-price thesis? |
| ☐ Liquidity | Are all three strikes liquid? |
| ☐ Exit plan | Will I close early if the stock approaches the middle strike? |
Key takeaway
Use it when you expect the stock to finish near a specific target price and want a low-cost, defined-risk trade.
The central trade-off is: small risk and potentially attractive reward, but only if the stock finishes near the middle strike.