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How Active is Your Fund Manager? A New Measure That Predicts Performance

  • Martijn Cremers
  • Antti Petajisto
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    We introduce a new measure of active portfolio management, Active Share, which represents the share of portfolio holdings that differ from the benchmark index holdings. We compute Active Share for domestic equity mutual funds from 1980 to 2003. We relate Active Share to fund characteristics such as size, expenses, and turnover in the cross-section, and we also examine its evolution over time. Active Share predicts fund performance: funds with the highest Active Share significantly outperform their benchmarks, both before and after expenses, and they exhibit strong performance persistence. Non-index funds with the lowest Active Share underperform their benchmarks.

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    File URL: http://icfpub.som.yale.edu/publications/2370
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    Paper provided by Yale School of Management in its series Yale School of Management Working Papers with number amz2370.

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    Date of creation: 01 Mar 2006
    Date of revision: 01 May 2009
    Handle: RePEc:ysm:somwrk:amz2370
    Contact details of provider: Web page: http://icf.som.yale.edu/

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    1. Cohen, Randolph & Coval, Joshua & Pástor, Luboš, 2003. "Judging Fund Managers by the Company They Keep," CEPR Discussion Papers 3717, C.E.P.R. Discussion Papers.
    2. Grinblatt, Mark & Titman, Sheridan D, 1989. "Mutual Fund Performance: An Analysis of Quarterly Portfolio Holdings," The Journal of Business, University of Chicago Press, vol. 62(3), pages 393-416, July.
    3. Jonathan B. Berk & Richard C. Green, 2002. "Mutual Fund Flows and Performance in Rational Markets," FAME Research Paper Series rp100, International Center for Financial Asset Management and Engineering.
    4. Luboš Pástor & Robert F. Stambaugh, . "Mutual Fund Performance and Seemingly Unrelated Assets.”," CRSP working papers 527, Center for Research in Security Prices, Graduate School of Business, University of Chicago.
    5. William N. Goetzmann & Stephen J. Brown, 1998. "Mutual Fund Styles," Yale School of Management Working Papers ysm40, Yale School of Management.
    6. Brown, Stephen J & Goetzmann, William N, 1995. " Performance Persistence," Journal of Finance, American Finance Association, vol. 50(2), pages 679-98, June.
    7. Goetzmann, William N. & Ivković, Zoran & Rouwenhorst, K. Geert, 2001. "Day Trading International Mutual Funds: Evidence and Policy Solutions," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 36(03), pages 287-309, September.
    8. Russ Wermers, 1999. "Mutual Fund Herding and the Impact on Stock Prices," Journal of Finance, American Finance Association, vol. 54(2), pages 581-622, 04.
    9. Matthew Spiegel & Harry Mamaysky & Hong Zhang, 2005. "Improved Forecasting of Mutual Fund Alphas and Betas," Yale School of Management Working Papers amz2361, Yale School of Management, revised 01 Mar 2006.
    10. Joseph Chen & Harrison Hong & Ming Huang & Jeffrey D. Kubik, 2004. "Does Fund Size Erode Mutual Fund Performance? The Role of Liquidity and Organization," American Economic Review, American Economic Association, vol. 94(5), pages 1276-1302, December.
    11. Russ Wermers, 2000. "Mutual Fund Performance: An Empirical Decomposition into Stock-Picking Talent, Style, Transactions Costs, and Expenses," Journal of Finance, American Finance Association, vol. 55(4), pages 1655-1703, 08.
    12. Daniel, Kent, et al, 1997. " Measuring Mutual Fund Performance with Characteristic-Based Benchmarks," Journal of Finance, American Finance Association, vol. 52(3), pages 1035-58, July.
    13. Fama, Eugene F, 1972. "Components of Investment Performance," Journal of Finance, American Finance Association, vol. 27(3), pages 551-67, June.
    14. Grinblatt, Mark & Titman, Sheridan, 1993. "Performance Measurement without Benchmarks: An Examination of Mutual Fund Returns," The Journal of Business, University of Chicago Press, vol. 66(1), pages 47-68, January.
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