Measuring Mutual Fund Timing of Broad Stock Misvaluation

Summary

This research summary explains a method for testing whether U.S. equity mutual fund managers adjust market exposure when broad stock misvaluation changes. It constructs a misvaluation measure from a long portfolio of repurchasing firms and a short portfolio of newly issuing firms, then orthogonalizes the measure against macroeconomic variables. A regression interaction between the measure and fund returns estimates a manager’s timing ability, alongside controls for standard market, volatility, liquidity, and sentiment timing.

Using U.S. mutual fund data from 1980 through 2016, the cited study reports positive aggregate timing estimates for most fund categories, with income funds as an exception. The results are described as robust to crisis-period exclusions, subperiod analysis, alternative misvaluation measures, and bootstrap tests. Portfolios sorted by estimated timing ability show return differences and some persistence. These are historical observational findings summarized from an overseas study; the article notes that they are not investment advice, and estimated timing may not generalize to other markets or periods.

Key ideas

• The study treats common misvaluation as a distinct form of mutual fund market timing.
• Its misvaluation indicator is built from repurchasing and newly issuing stocks and adjusted for macroeconomic conditions.
• A positive timing estimate means managers tend to raise market exposure when misvaluation is above its historical average.
• Reported aggregate results remain positive after controlling for other timing styles and conducting robustness checks.
• Bootstrap and sorted-portfolio analyses suggest skill and return persistence, but the evidence is historical and market-specific.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.