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Thy Neighbor's Portfolio: Word-of-Mouth Effects in the Holdings and Trades of Money Managers

47 Pages Posted: 2 Jun 2003  

Jeffrey D. Kubik

Syracuse University - Department of Economics

Harrison G. Hong

Columbia University, Graduate School of Arts and Sciences, Department of Economics; National Bureau of Economic Research (NBER)

Jeremy C. Stein

Harvard University - Department of Economics; National Bureau of Economic Research (NBER)

Date Written: May 2003

Abstract

A mutual-fund manager is more likely to hold (or buy, or sell) a particular stock in any quarter if other managers in the same city are holding (or buying, or selling) that same stock. This pattern shows up even when controlling for the distance between the fund manager and the stock in question, so it is distinct from a local-preference effect. It is also robust to a variety of controls for investment styles. These results can be interpreted in terms of an epidemic model in which investors spread information about stocks to one another by word of mouth.

Suggested Citation

Kubik, Jeffrey D. and Hong, Harrison G. and Stein, Jeremy C., Thy Neighbor's Portfolio: Word-of-Mouth Effects in the Holdings and Trades of Money Managers (May 2003). Harvard Institute of Economic Research Discussion Paper No. 2006. Available at SSRN: https://ssrn.com/abstract=331140 or http://dx.doi.org/10.2139/ssrn.331140

Jeffrey Kubik

Syracuse University - Department of Economics ( email )

426 Eggers Hall
Syracuse, NY 13244-1020
United States
315-443-9063 (Phone)
315-443-1081 (Fax)

Harrison Hong

Columbia University, Graduate School of Arts and Sciences, Department of Economics ( email )

420 W. 118th Street
New York, NY 10027
United States

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Jeremy Stein (Contact Author)

Harvard University - Department of Economics ( email )

Littauer Center
Cambridge, MA 02138
United States
617-496-6455 (Phone)
617-496-7352 (Fax)

HOME PAGE: http://post.economics.harvard.edu/faculty/stein/stein.html

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

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