Why butterfly spreads are useful in options trading
In a nutshell, butterfly spreads are useful when you think a stock will be more or less volatile than the market seems to think.
With a long butterfly spread, the maximum profit is right in the middle -- that is, you'll make the most money if the stock's price finishes at the strike price of the at-the-money options. You'll lose money if the stock's price falls or rises by more than a certain amount.
On the other hand, with a short butterfly spread, the maximum profit is at the extremes. In other words, you'll make the most money if the stock ends lower than the lowest strike price in the butterfly spread or higher than the highest strike price. You'll lose money if the stock either stays where it is or doesn't move much.
How butterfly spreads can be good strategies to use
Essentially, butterfly spreads can be useful in situations where you think a stock's volatility is going to either be especially low or especially high.
A long butterfly spread is designed to profit when a stock doesn't move much at all. You'll make the most money if it ends up at exactly the at-the-money call price at expiration and will lose money if it moves too far in either direction.
On the other hand, a short butterfly spread is designed to profit when a stock moves significantly away from the at-the-money price when the trade is placed and makes the most money if it finishes lower than the low strike price or higher than the highest strike price in the trade.
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