You are long a 5-10-15 butterfly. On which of the following expiration price(s) will you make the most money?
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A long butterfly spread strategy is to long (buy) one lower striking in-the-money call, short (sell/write) two at-the-money calls and long another higher striking out-of-the-money call.
Maximum profit for the long butterfly spread is attained when the underlying stock price remains unchanged (as that of the at-the-money calls) at expiration. At this price, only the lower striking call expires in the money ( see more here ).