Measuring Mutual Fund Market Timing Against Systematic Stock Mispricing

Summary

This study examines whether U.S. equity mutual fund managers adjust market exposure when broad stock mispricing changes. It builds a market mispricing measure from a financing-based long-short factor, then orthogonalizes it against macroeconomic variables. A fund’s timing coefficient captures whether its market beta rises or falls as mispricing moves relative to its trailing average. The analysis uses portfolio-level and individual-fund tests, controlling for other timing styles and risk factors.

Across a 1980–2016 sample, the reported evidence indicates that many growth-oriented funds increase market exposure when systematic undervaluation is higher; income funds show no comparable result. The association persists after excluding major crisis periods and after controls for volatility, liquidity, sentiment, and market timing. Bootstrap tests suggest stronger timing results are not explained entirely by chance, and portfolios ranked on timing ability show economically meaningful return differences. Smaller, younger, and higher-turnover funds tend to exhibit more of this behavior. These are historical observational findings; the measure depends on model choices, and the source cautions that changing market conditions may weaken its usefulness.

Key ideas

• The model estimates market timing by relating fund beta to deviations in a systematic mispricing measure from its trailing mean.
• The mispricing measure is derived from a long-short factor and adjusted for macroeconomic influences.
• Timing coefficients remain positive for several equity fund categories after controls and crisis-period exclusions.
• Bootstrap resampling is used to assess whether individual funds’ apparent timing skill could be due to chance.
• Smaller, younger, and higher-turnover funds are more associated with mispricing-based exposure changes.

Tags

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