We develop a stock return-predictive measure based on an efficient aggregation of the portfolio holdings of all actively managed U.S. domestic equity mutual funds, and use this model to study the source of fund managers' stock-selection abilities. This "generalized-inverse alpha" (GIA) approach...

Theories of herding behavior predict that only investors with sufficiently precise private information or those most overconfident will deviate from the crowd. Using portfolio holdings, this paper identifies contrarian funds as those pursuing distinctive investment strategies, i.e., as those...