How Active is Your Fund Manager? A New Measure That Predicts Performance
47 Pages Posted: 21 Mar 2006 Last revised: 9 Feb 2019
Date Written: March 31, 2009
We introduce a new measure of active portfolio management, Active Share, which represents the share of portfolio holdings that differ from the benchmark index holdings. We compute Active Share for domestic equity mutual funds from 1980 to 2003. We relate Active Share to fund characteristics such as size, expenses, and turnover in the cross-section, and we also examine its evolution over time. Active Share predicts fund performance: funds with the highest Active Share significantly outperform their benchmarks, both before and after expenses, and they exhibit strong performance persistence. Non-index funds with the lowest Active Share underperform their benchmarks.
Keywords: Portfolio management, Active Share, tracking error, closet indexing
JEL Classification: G10, G14, G20, G23
Suggested Citation: Suggested Citation