This study examines how the efficiency of trading desks operated by mutual fund families affects portfolio performance and investment behavior of affiliated funds. We estimate the trading efficiency of a fund family's trading desk as the difference between the gross return of the family's index fund, which incorporates trading costs, and the return of the underlying index, which does not incorporate trading costs, around index adjustment dates. By operating more efficient trading desks that help reduce trading costs, fund families improve the performance of their funds significantly and also enable their funds to trade more and hold less liquid portfolios.

Human capital acquired while working in other industries before joining fund management provides fund managers with an information advantage. Fund managers exploit this advantage by overweighting their experience industries and by picking outperforming stocks from these industries. These managers’ superior information is impounded into stock prices slowly, suggesting that their information is unique and takes a while to be discovered by the markets. Families exploit their manager’s industry-specific human capital by broadly employing their investment ideas in other funds. The investment value of industry experience is unaffected by whether or not the manager with such experience is in a team. Received August 25, 2016; editorial decision December 24, 2017 by Editor Andrew Karolyi.