Iron Butterfly
A short straddle with protective wings — defined risk, maximum premium at ATM.
The iron butterfly is a combination of a short straddle (sell ATM call + ATM put) and a long strangle (buy OTM call + OTM put). It offers the high premium collection of a straddle but caps your maximum loss with the protective wings. It profits most when the underlying expires exactly at the ATM strike.
Strategy Structure
Sell 1 ATM Call + Sell 1 ATM Put + Buy 1 OTM Call (protection) + Buy 1 OTM Put (protection).
Profit & Loss Profile
Market Outlook
Very neutral — expecting minimal movement, price pinned near ATM.
When to Use
- You believe the market will stay pinned at or near current levels
- You want more premium than an iron condor with defined risk
- IV is elevated and you want maximum theta exposure
- Expiry-day plays where gamma/pin risk is acceptable
When to Avoid
- When you expect any directional movement
- In low IV environments (premiums too small)
- Before events that could cause a breakout
- If you cannot afford the time to actively manage the position
Ideal Conditions
- Expecting the underlying to expire very close to the current price
- High IV environment for maximum premium capture at ATM
- Weekly expiry plays where pin risk is expected
- Post-event plays where you expect IV crush and range-bound action
Greeks Impact
Zero delta at entry. Rapidly shifts as price moves away from the ATM strike.
Highest negative gamma of any defined-risk strategy — your delta changes quickly near the short strike.
Maximum positive theta — ATM options have the highest theta. This is the fastest-decaying structure.
Strongly negative vega — benefits significantly from IV contraction.
Nifty Example
Setup: Sell 22500 CE at ₹90, Sell 22500 PE at ₹85, Buy 22300 PE at ₹25, Buy 22700 CE at ₹22. Net premium = (90 + 85) - (25 + 22) = ₹128. Max profit per lot = ₹128 × 25 = ₹3,200. Max loss per lot = (200 - 128) × 25 = ₹1,800.
If profitable: If Nifty expires at exactly 22500, both short options expire worthless and long options are also worthless. You keep the full ₹3,200.
If loss: If Nifty moves to 22700 or 22300, the tested spread reaches max loss of ₹1,800 per lot.
Adjustments & Risk Management
- Roll the tested wing closer if the underlying is trending toward it
- Convert to a broken-wing butterfly by adjusting the wing widths
- Close at 25-50% of max profit to reduce gamma risk near expiry
- Add a directional position if the market starts trending
Iron Butterfly vs Iron Condor
The key difference is strike placement. An iron butterfly sells ATM options (maximum premium) while an iron condor sells OTM options (wider profit zone). The iron butterfly collects significantly more premium but has a much narrower range where it profits.
Think of the iron butterfly as the "high conviction" version of the iron condor — you get paid more but need the market to cooperate more precisely. Iron butterflies are particularly effective on expiry day when you expect price pinning behavior around key strikes.
Related Strategies
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