A Factor-Based Portfolio Stratified by Convertible Bond Type
Summary
This research proposes treating convertible bonds differently according to whether they are bond-like, balanced, or equity-like, classified by the premium of parity value over bond value. It explains a valuation decomposition in which a bond floor or parity-based floor is combined with the option's time value. The reported factor choices vary by segment: conversion premium and an amplitude-based measure for equity-like bonds; conversion premium and the difference between bond and underlying-stock amplitudes for balanced bonds; and amplitude difference plus current yield for bond-like bonds.
The portfolio standardizes and equally combines segment-specific factors, then selects up to ten bonds per segment at month end and equally weights them from the next month's first trading day. The article reports historical returns and risk statistics, including a lower-volatility variant that excludes the equity-like segment. These results are backtest claims, not guarantees: the sample is limited, current valuations may be elevated, and transaction costs and trading frictions were omitted. It also warns that highly traded, recently risen equity-like bonds may suffer larger drawdowns in a reversal.
Key ideas
- Convertible bonds are grouped into bond-like, balanced, and equity-like segments based on parity premium.
- The analysis separates the bond or parity floor from the option's time value.
- Different factors are selected for each segment, including conversion premium, amplitude measures, and current yield.
- The portfolio selects and equally weights bonds monthly, with segment-specific factor scores.
- The reported historical results omit transaction costs and may not carry forward to changed market conditions.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.