KACPERCZYK, MARCIN; SIALM, CLEMENS; ZHENG, LU - In: Journal of Finance 60 (2005) 4, pp. 1983-2011
Mutual fund managers may decide to deviate from a well-diversified portfolio and concentrate their holdings in industries where they have informational advantages. In this paper, we study the relation between the industry concentration and the performance of actively managed U.S. mutual funds...