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...

We use a novel sample of separate accounts to perform an out-of-sample test of the predictive power of active share (Cremers and Petajisto, 2009). While active share has limited predictive power unconditionally, it has significant power conditional on past performance. We find strong positive...