Iron Butterfly
A precise neutral strategy targeting maximum profit when the stock pins exactly at the middle strike — higher premium collected than an iron condor, but a much narrower profit window.
What is an Iron Butterfly?
An iron butterfly is a four-leg strategy combining a bull put spread and a bear call spread, where the short put and short call share the same strike price (the middle strike). It generates a higher net credit than an iron condor, but requires the stock to stay very close to the middle strike to achieve maximum profit.
Structure:
- Buy an OTM put at Strike A (lowest)
- Sell an ATM put at Strike B (middle — same as short call)
- Sell an ATM call at Strike B (middle — same as short put)
- Buy an OTM call at Strike C (highest)
Iron Butterfly vs. Iron Condor
| Feature | Iron Butterfly | Iron Condor |
|---|---|---|
| Short Strikes | Same strike (ATM) | Two different OTM strikes |
| Net Credit | Higher premium | Lower premium |
| Profit Zone | Narrow — stock must pin near ATM | Wider range between short strikes |
| Win Probability | Lower (tighter target) | Higher (wider range) |
| Max Profit Potential | Higher | Lower |
| Best Market | Extremely low volatility, stock "pinned" | Low volatility, range-bound |
Advantages
- Higher net credit than iron condor
- Defined risk — maximum loss capped at entry
- Theta decay benefits the position near expiration
- Lower capital than selling naked straddles
- Profits from IV drop
Disadvantages
- Very narrow profit zone — stock must stay extremely close to middle strike
- Low probability of full profit
- High transaction costs — four legs eat into small profits
- Difficult to adjust compared to iron condor
- ATM short options have high assignment risk near expiration
When to Use
Ideal Conditions:
- Very low volatility expected — stock barely moving
- High IV — collect large credits that will shrink as IV falls
- Strong ATM magnet — stock gravitating toward a key level
- Post-event calm — after major earnings or macro event
- Expiration week plays where pin risk is in your favor
Avoid When:
- Upcoming earnings, Fed announcements, or major news
- Market or stock is in a strong trend
- IV is already very low (premiums too small)
- You need a high-probability trade — iron condor is better
Example: XYZ at $100
- Buy 1 XYZ $90 Put @ $1.50
- Sell 1 XYZ $100 Put @ $4.00
- Sell 1 XYZ $100 Call @ $4.00
- Buy 1 XYZ $110 Call @ $1.50
Net Credit: $5.00 → Max Profit: $500
Stock pins at $100 at expiration
Max Loss: $500 (1:1 Risk/Reward)
$1,000 spread − $500 credit = $500
Breakeven Points:
Lower: $100 − $5 = $95 | Upper: $100 + $5 = $105
Risk Management
- Exit at 25–50% of max profit — don't hold to expiration
- Stop loss at 1× credit received
- Close early with 7–10 days to expiration — avoid gamma and assignment risk
- Convert to iron condor if stock moves — buy back one short, sell a new OTM
- Small position sizing — no more than 1–2% of portfolio per trade
- Use liquid underlyings (SPY, QQQ) to minimize slippage on four legs
Related Topics
Iron CondorLong Call ButterflyATM OptionsTheta DecayIV CrushNeutral StrategiesDefined RiskPin Risk