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Sell a set number of call contracts At-the-Money (ATM) for a selected target month. |
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Sell the same number of put contracts at the same strike price in the same target month. |
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Buy the same number of call contracts one or more strikes Out-of-the-Money (OTM) in the same target month. |
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Buy the same number of put contracts one or more strikes Out-of-the-Money (OTM) in the same target month. |
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An overall net credit will be achieved. The net credit is the maximum profit. The maximum profit is realized if the stock is right at the sold options' strike price at expiration. |
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The upper break even for the position is equal to the sold options strike price plus the total net credit. |
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The lower break even is equal to the sold options strike price minus the total net credit. |
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Profit is realized if the stock is below the upper break even and above the lower break even. |
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The maximum risk for the iron butterfly option is the difference in strike prices on either spread minus the net credit. |
% Return = |
(Total Net Credit / Margin for the spread) * 100 |
Where:
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Total Net Credit = |
Credit from Bull Put Spread + Credit from Bear Call Spread. |
Margin = |
(Diff in strikes Bull-Put Spread OR Diff in Strikes Bear Call Spread Whichever is greater) - Net Credit. |
Example: |
Index $XYZ at $145.70 per share. |
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Buy the SEP 140 Put for $2.45 |
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Sell the SEP 145 Put for $4.20 |
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Sell the SEP 145 Call for $4.90 |
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Buy the SEP 150 Call for $3.10 |
Max. Profit = |
Net Credit = $4.90 + $4.20 - $2.45 - $3.10 = $3.55 |
Max. Risk = Margin = |
Difference in Strikes - Net Credit = $5 - $3.55 = $1.45 |
Upper Break Even = |
Short Call Strike + Net Credit = $145 + $3.55= $148.55 |
Lower Break Even = |
Short Put Strike - Net Credit = $145 - $3.55 = $141.45 |
Max. Return = |
Net Credit ÷ Margin = $3.55 ÷ $1.45 = 244.3% (If index is trading at $145 on expiration). |
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Commission costs to open the position are higher since there are four trades. Lower credit Iron Butterflies might be cost prohibitive due to large commission costs. |
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The maximum profit only occurs if the stock is at the sold options' strike price at expiration. |
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Iron Butterflies offer a higher return then an Iron Condor spread, but they offer less safety. Since the Upper and Lower Break Evens are so close to the current price of the underlying, the stock or index can only have a small movement before the Iron Butterfly trade is no longer profitable. |
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The credit you receive for the trade is generally much smaller than the max risk of the trade, therefore it is prudent to close the short option before the position is at max loss. Many traders do this when the short option is near-the-money. |
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If you have closed the short option half of the trade you may want to consider holding the long option to possibly profit from continued directional momentum in the underlying. However, the danger is that the underlying will correct and whipsaw in the other direction. |