Basically, this strategy combines a bull spread and a bear spread to form its design. For investors to profit from butterfly spreads, the stock price of the underlying assets needs to be relatively stable. Large movements away from the middle exercise price result in losses for the investment.

Below, the profit potentials for a bull and bear spread are graphed. The bull spread was created by purchasing a call with a $35 strike price for $250 and selling a call with a $40 strike price for $175. Although it was not covered in a previous article introducing bear spreads, they can be created using calls rather than puts.

The bear spread below consists of a long call with a $45 strike and a short call with a $40 exercise price. Notice that the bear and bull spreads have opposite payoff potential. The bear spread is essentially a short bull spread.

By combining the bull and bear spread, the profit potential for a butterfly spread can be shown. In the example below, an investor would purchase two call options, one with a strike of $35 and one with a strike of $40, and sell two call options with strikes of $40. The spread exists between the $35 and $45 prices. As the stock price approaches the $40 point from either end, the butterfly spread gains value. At this $40 point, the investor using this strategy would realize the maximum profit of $450.

However, because this strategy uses four different call options with different strike prices, each of the premiums have different prices. This results in potential losses for the butterfly spread if the stock price deviates far enough away from the $40 point. Moreover, two break even points exist at the $35.50 and $44.50 points.

As long as the stock price stays between these two prices, the strategy will avoid any loss. However, once the stock price moves away from this spread, the investor will be out-of-the-money $50.