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The Small World of Investing: Board Connections and Mutual Fund Returns

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Author Info
Lauren Cohen
Andrea Frazzini
Christopher Malloy

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Abstract

This paper uses social networks to identify information transfer in security markets. We focus on connections between mutual fund managers and corporate board members via shared education networks. We find that portfolio managers place larger bets on firms they are connected to through their network, and perform significantly better on these holdings relative to their non-connected holdings. A replicating portfolio of connected stocks outperforms a replicating portfolio of non-connected stocks by up to 8.4% per year. Returns are concentrated around corporate news announcements, consistent with mutual fund managers gaining an informational advantage through the education networks. Our results suggest that social networks may be an important mechanism for information flow into asset prices.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 13121.

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Date of creation: May 2007
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Handle: RePEc:nbr:nberwo:13121

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Find related papers by JEL classification:
G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Grinblatt, Mark & Titman, Sheridan, 1993. "Performance Measurement without Benchmarks: An Examination of Mutual Fund Returns," Journal of Business, University of Chicago Press, vol. 66(1), pages 47-68, January. [Downloadable!] (restricted)
  2. Jackson, Matthew O., 2005. "The economics of social networks," Working Papers 1237, California Institute of Technology, Division of the Humanities and Social Sciences. [Downloadable!]
  3. Carhart, Mark M, 1997. " On Persistence in Mutual Fund Performance," Journal of Finance, American Finance Association, vol. 52(1), pages 57-82, March. [Downloadable!] (restricted)
  4. Martin J. Conyon & Mark R. Muldoon, 2006. "The Small World of Corporate Boards," Journal of Business Finance & Accounting, Blackwell Publishing, vol. 33(9-10), pages 1321-1343. [Downloadable!] (restricted)
  5. Mara Faccio, 2006. "Politically Connected Firms," American Economic Review, American Economic Association, vol. 96(1), pages 369-386, March. [Downloadable!]
  6. Huberman, Gur, 2001. "Familiarity Breeds Investment," Review of Financial Studies, Oxford University Press for Society for Financial Studies, vol. 14(3), pages 659-80.
  7. Yael V. Hochberg & Alexander Ljungqvist & Yang Lu, 2007. "Whom You Know Matters: Venture Capital Networks and Investment Performance," Journal of Finance, American Finance Association, vol. 62(1), pages 251-301, 02. [Downloadable!] (restricted)
  8. Goetzmann, W.N. & Ibbotson, R.G., 1990. "Do Winners Repeat? Patterns in Mutual Fund Behavior," Papers fb-_91-04, Columbia - Graduate School of Business.
  9. Malcolm Baker & Lubomir Litov & Jessica A. Wachter & Jeffrey Wurgler, 2004. "Can Mutual Fund Managers Pick Stocks? Evidence from the Trades Prior to Earnings Announcements," NBER Working Papers 10685, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  10. Brown, Stephen J & Goetzmann, William N, 1995. " Performance Persistence," Journal of Finance, American Finance Association, vol. 50(2), pages 679-98, June. [Downloadable!] (restricted)
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  11. Harrison Hong & Jeffrey D. Kubik & Jeremy C. Stein, 2004. "Social Interaction and Stock-Market Participation," Journal of Finance, American Finance Association, vol. 59(1), pages 137-163, 02. [Downloadable!] (restricted)
  12. Randolph B. Cohen & Joshua D. Coval & Lubos Pástor, 2005. "Judging Fund Managers by the Company They Keep," Journal of Finance, American Finance Association, vol. 60(3), pages 1057-1096, 06. [Downloadable!] (restricted)
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  13. Grossman, Sanford J & Stiglitz, Joseph E, 1976. "Information and Competitive Price Systems," American Economic Review, American Economic Association, vol. 66(2), pages 246-53, May.
  14. Francisco Pérez-González, 2006. "Inherited Control and Firm Performance," American Economic Review, American Economic Association, vol. 96(5), pages 1559-1588, December. [Downloadable!]
  15. Grinblatt, Mark & Titman, Sheridan D, 1989. "Mutual Fund Performance: An Analysis of Quarterly Portfolio Holdings," Journal of Business, University of Chicago Press, vol. 62(3), pages 393-416, July. [Downloadable!] (restricted)
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  16. Harrison Hong & Jeffrey D. Kubik & Jeremy C. Stein, 2005. "Thy Neighbor's Portfolio: Word-of-Mouth Effects in the Holdings and Trades of Money Managers," Journal of Finance, American Finance Association, vol. 60(6), pages 2801-2824, December. [Downloadable!] (restricted)
  17. Grinblatt, Mark & Titman, Sheridan & Wermers, Russ, 1995. "Momentum Investment Strategies, Portfolio Performance, and Herding: A Study of Mutual Fund Behavior," American Economic Review, American Economic Association, vol. 85(5), pages 1088-1105, December. [Downloadable!] (restricted)
  18. Jonathan B. Berk & Richard C. Green, 2004. "Mutual Fund Flows and Performance in Rational Markets," Journal of Political Economy, University of Chicago Press, vol. 112(6), pages 1269-1295, December.
  19. Jegadeesh, Narasimhan & Titman, Sheridan, 1993. " Returns to Buying Winners and Selling Losers: Implications for Stock Market Efficiency," Journal of Finance, American Finance Association, vol. 48(1), pages 65-91, March. [Downloadable!] (restricted)
  20. Judith Chevalier & Glenn Ellison, 1999. "Are Some Mutual Fund Managers Better Than Others? Cross-Sectional Patterns in Behavior and Performance," Journal of Finance, American Finance Association, vol. 54(3), pages 875-899, 06. [Downloadable!] (restricted)
    Other versions:
Full references

Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Stijn Van Nieuwerburgh & Laura Veldkamp, 2007. "Information Immobility and the Home Bias Puzzle," NBER Working Papers 13366, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  2. Lauren Cohen & Andrea Frazzini & Christopher Malloy, 2008. "Sell Side School Ties," NBER Working Papers 13973, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  3. Jeremy C. Stein, 2007. "Conversations Among Competitors," NBER Working Papers 13370, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  4. Braggion, F., 2008. "Managers, Firms and (Secret) Social Networks: The Economics of Freemasonry," Discussion Paper 2008-36, Tilburg University, Center for Economic Research. [Downloadable!]
  5. Gray, Wesley, 2008. "Information Exchange and the Limits of Arbitrage," MPRA Paper 12621, University Library of Munich, Germany. [Downloadable!]
    Other versions:
  6. Lauren Cohen & Andrea Frazzini & Christopher Malloy, 2008. "Hiring Cheerleaders: Board Appointments of "Independent" Directors," NBER Working Papers 14232, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  7. Jennifer Huang & Clemens Sialm & Hanjiang Zhang, 2009. "Risk Shifting and Mutual Fund Performance," NBER Working Papers 14903, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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