Some investment advisors offer multiple versions of a fund with the same manager and highly correlated returns. But these twinʺ funds are separate portfolios for different investors with differing abilities to select and monitor managers. Using a matched sample of retail and institutional twin...

We explore the relation between fund performance and the assets managed by the fund's managers that are outside the fund. Controlling for fund size, we find a negative relation between fund performance and the size of the manager's outside holdings, the number of other funds managed, and the...