Butterfly Trade (Bonds)
A butterfly trade in the bond market is a relative value position that simultaneously takes opposite directional exposures at the wings and body of the yield curve — typically buying the intermediate maturity (body) and selling the short and long maturities (wings), or the reverse — structured to be duration-neutral and designed to profit from changes in curve curvature.
The butterfly trade gets its name from the shape of the yield curve positions it exploits: a center point (the body) flanked by two outer points (the wings). The most common version is a 2s10s30s butterfly, which trades the 2-year, 10-year, and 30-year Treasury maturities. A long butterfly position is long the 10-year (body) and short the 2-year and 30-year (wings), structured so that the overall position is duration-neutral — no net sensitivity to a parallel yield curve shift.
The construction of a duration-neutral butterfly requires careful weighting. The DV01 of the body position must equal the sum of the DV01s of the two wing positions. Because the 2-year and 30-year have very different durations, their notional amounts must be sized asymmetrically to produce a dollar duration balance. In practice, the 30-year wing tends to have a much smaller notional than the 2-year wing given its higher duration.
A long butterfly profits when the yield curve becomes more concave (humped) — that is, when 10-year yields fall more than the average of 2-year and 30-year yields, or equivalently when the curve becomes steeper at the short end and flatter at the long end simultaneously. A short butterfly profits from a more convex (inverted hump) curve shape, where the intermediate maturity underperforms both wings.
Butterfly trades are popular among fixed income relative value managers because they isolate curvature as a risk factor distinct from the level and slope of the yield curve. Academic models of the yield curve — such as the Nelson-Siegel framework — parameterize term structure movements in terms of level, slope, and curvature, and butterfly trades are the natural expression of a curvature view without level or slope directional exposure.
Implementation requires precision in DV01 matching and continuous hedging rebalancing as the butterfly position's duration profile changes with the passage of time and movements in rates. Butterfly trades are most commonly implemented using Treasury futures for capital efficiency, though cash bonds, interest rate swaps, or combinations of all three are used depending on balance sheet constraints and target exposure.