The Iron Butterfly
Turn stability into cash flow. Collect high premiums by betting the stock will stay right where it is, with insurance on both sides.
What is an Iron Butterfly?
An Iron Butterfly is a four-leg neutral strategy. It combines selling a Straddle (ATM Call + ATM Put) with buying a Strangle (OTM Call + OTM Put) for protection.
The goal is for the stock price to remain unchanged at expiration. You collect a large credit upfront and keep it if the stock doesn't move. The protective wings limit your loss if the stock explodes in either direction.
Is This Strategy Right for You?
Capital Requirements
Low. Requires margin to cover the spread width minus credit received.
Options Approval Level
Level 3. Requires spreads (specifically 4-leg spreads/iron condors).
Best Suited For
- •Stocks with high implied volatility that is expected to drop
- •Range-bound markets or stocks going sideways
- •Income generation with strict risk controls
Pros and Risks
Advantages
- ✓Defined Risk: Unlike a short straddle, your max loss is capped.
- ✓High Income: Collects more premium than an Iron Condor because you sell ATM options.
- ✓Delta Neutral: Starts with little directional bias.
Risks to Consider
- ⚠Narrow Profit Tent: The stock must stay very close to the strike to keep max profit.
- ⚠Commission Heavy: Four legs means 4x the transaction costs.
- ⚠Assignment Risk: Short options are ATM, increasing early assignment risk near expiration.
How It Works
Structure (Short Center)
Sell the Straddle
Sell an ATM Call and ATM Put. This collects the most premium but has unlimited risk.
Buy Protection
Buy an OTM Call and OTM Put equidistant from the center strike. This caps your risk.
Manage Expiration
As time passes or volatility drops, the position profits. Close early to lock in gains and avoid pin risk if the stock is near your center strike.
Worked Example: XYZ at $100
Selling the $100 Straddle, Protecting at $90/$110.
Iron Butterfly Payoff
Trade Entry
Sell $100 Call/Put
+$8.00 credit
Buy $110 Call / $90 Put
-$2.00 debit
Net Credit
+$6.00
Max Risk
$4.00
Stock Finishes at $100
Options Outcome
All Expire Worthless
Net Profit
+$600 (Max Profit)
You keep the entire $6.00 credit collected upfront.
Stock Rallies to $120
Internal Loss
-$10.00 (Spread width)
Initial Credit
+$6.00
Net Loss
-$4.00 (Max Loss)
Common Scenarios
IV Crush
Sold before earnings, the stock moves a little, but volatility collapses. The short options lose value rapidly, allowing you to close for a profit.
Sideways Grind
The stock chops around the current price for weeks. Theta decay works in your favor daily, eroding the extrinsic value of the options you sold.