Butterfly Trades and Embedded One-Step Butterflies
A butterfly trade involves buying one strike, selling two strikes, and buying another strike, with maximum value when the underlying is at the center strike. When a butterfly has more than one strike increment between the longs and shorts, it contains multiple embedded one-step butterflies. The number of embedded butterflies can be calculated by squaring the number of steps between the strikes. For example, a butterfly with strikes at 25, 30, 35, 40, 45 contains four embedded one-step butterflies.