چکیده ای از مقاله

We examine the relation between country and industry portfolio concentration and performance using a data set of international equity mutual funds. When sorted by concentration measures, funds in the most concentrated quintile outperform those in the most diversified quintile by 0.16% and 0.30% monthly in country and industry dimensions, respectively. Further analysis shows that the superior performance of concentrated funds is largely driven by industry rather than country concentration, suggesting the existence of global industry private information. Finally, we show that industry-concentrated funds rotate top-holding industries less frequently than their diversified counterparts, and that the industries these funds purchase subsequently outperform the industries they sell.