PT - JOURNAL ARTICLE AU - Robin Grieves TI - Butterfly Trades AID - 10.3905/jpm.1999.319777 DP - 1999 Oct 31 TA - The Journal of Portfolio Management PG - 87--95 VI - 26 IP - 1 4099 - https://pm-research.com/content/26/1/87.short 4100 - https://pm-research.com/content/26/1/87.full AB - Investors who want to sell rich securities or buy cheap securities and maintain their portfolio durations often employ butterfly trades. A butterfly trade typically uses three securities of different durations. The shortest and longest-duration instruments are the wings; the middle-duration instrument is the body. There are multiple ways to structure butterfly trades. For example: cash and duration-neutral weighting, fifty/fifty weighting, and regression weighting. The author notes that it is unfortunate that the term “weighting” appears in two entirely different contexts of butterfly trades. The first use is how to structure a trade. The second is how best to measure yield spreads. Despite the well-known shortcomings of yield to maturity as a predictor of total rate of return, the author uses yield spreads and changing yield spreads to try to predict total returns to butterfly trade positions. Different spread weighting methods can be evaluated on how well they correlate with realized returns.