Call Butterfly
A call butterfly is a neutral, limited-risk strategy that combines a bull call spread and a bear call spread. It is designed to profit from a stock staying within a very specific, narrow range. The strategy is constructed using three different strike prices: purchasing one "in-the-money" (ITM) call, selling two "at-the-money" (ATM) calls, and purchasing one "out-of-the-money" (OTM) call. All four options must have the same expiration date and the strikes must be equidistant from the center.
Traders enter a call butterfly when they have high conviction that a stock will remain stagnant and pin a specific price by expiration. Because the two sold calls generate a significant amount of premium, they offset the cost of the two long calls, making the butterfly a very low-cost trade to enter. The trade is entered for a net debit, which represents the maximum potential loss.
The payoff structure of a call butterfly looks like a "tent" or a tall triangle. The maximum profit is achieved if the underlying asset expires exactly at the middle (short) strike price. At this point, the lower long call is at its maximum value relative to the short calls, while the upper long call and both short calls expire worthless. There are two break-even points: the lower strike plus the premium paid, and the upper strike minus the premium paid. For example, if you buy a 95 call, sell two 100 calls, and buy a 105 call for a $1 debit, your max profit is $400 ($5 width - $1 cost) if the stock hits $100.
Time decay (theta) is the primary driver of profit for a butterfly. The strategy relies on the "extrinsic value" of the two short calls eroding faster than the long calls as expiration approaches. This means the trade usually doesn't show a significant profit until the final days or even hours of the option's life. Because the position is "vega neutral" (or nearly so), it is less sensitive to changes in implied volatility than straddles or strangles, though a decrease in volatility generally helps the trade.
Managing a call butterfly requires extreme patience. Because the maximum profit is only realized at a single point in time (expiration), many traders exit the trade early if the stock hits their target price, even if the options haven't fully decayed. If the stock moves significantly outside the "wings" (the outer strikes), the trade reaches its maximum loss. However, since the initial cost is so low, many traders simply let the position run to expiration as a "fixed-risk" bet.
The call butterfly is a favorite for traders who value high reward-to-risk ratios. It is common to see butterflies where the potential profit is 4 or 5 times the amount of capital at risk. The trade-off is a very low probability of hitting that maximum profit. It is an ideal strategy for low-volatility environments or for "pinning" a stock after a major event has already occurred and the price has stabilized.
