Iron Butterfly
An iron butterfly trades room for reward — it collects more premium than an iron condor but needs the stock to sit nearly still near one price.
What an iron butterfly is made of
An iron butterfly is a tighter, higher-credit relative of the iron condor. It centers on one strike and adds protective wings:
- At the center strike (near the current price), sell a put and sell a call — this pair is a short straddle.
- For protection, buy an out-of-the-money put below and buy an out-of-the-money call above — these are the wings.
You collect a net credit, and it is larger than an iron condor's because the options you sell are at the money, where premium is richest. The bought wings cap the risk on both sides. For the broader range-bound cousin, see the iron condor; for why the wings make the risk defined, see defined versus undefined risk.
What it is betting on
An iron butterfly is a bet that the stock finishes near the center strike at expiration. The peak payoff requires the stock to land at or very close to that one price. It is a neutral, low-movement view expressed with more conviction — and less room — than an iron condor.
The shape of profit and loss
- Max profit = the net credit received, achieved when the stock pins the center strike at expiration so both short options expire worthless.
- Max loss = the wing width minus the net credit. Only one wing can be breached at expiration, so you subtract one width, not both.
- Breakevens = the center strike plus the credit, and the center strike minus the credit.
A worked example
Suppose a stock trades near 100. You sell the 100 put and the 100 call, and buy the 90 put and the 110 call as wings — each wing is ten points from the center — for a net credit of 6.00 (600 dollars per one-lot, since each contract covers 100 shares).
- Max profit: the 6.00 credit (600 dollars), if the stock closes at exactly 100.
- Max loss: 10.00 wing width minus 6.00 credit = 4.00 (400 dollars), if the stock finishes at or below 90, or at or above 110.
- Lower breakeven: 100 − 6.00 = 94.00.
- Upper breakeven: 100 + 6.00 = 106.00.
The position is profitable between 94 and 106, but the full 600-dollar credit is only kept if the stock pins 100. Away from the center, the short straddle gives back value quickly.
Iron butterfly versus iron condor
The two structures answer the same question — will the stock stay calm? — with opposite trade-offs.
| Feature | Iron butterfly | Iron condor |
|---|---|---|
| Short options | At the money (one center strike) | Out of the money (two separated strikes) |
| Credit collected | Larger | Smaller |
| Profit zone | Narrow, peaks at the center | Wide plateau between the shorts |
| How often it wins | Less often | More often |
The iron butterfly pays more up front, but it needs the stock to sit still near one price. That larger credit is compensation for a narrower profit zone, so it wins less often than a wider iron condor. The bigger headline credit is not a free lunch — it is the price of demanding precision.
The honest failure mode
Because the short options are at the money, the stock starts essentially at the center and is likely to drift away from it. Any meaningful move reduces the gain, and a move past a wing produces the maximum loss. The iron butterfly is short premium, so it benefits from time decay but is hurt by a volatility spike or a decisive directional move — and its narrow zone means it gives up its edge faster than a wider iron condor when the stock refuses to stand still.
Educational only — not investment advice. Options involve a substantial risk of loss and are not suitable for every investor.