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Assessing performance of Morningstar’s star rating system for equity investment

Author

Listed:
  • Paul J. Bolster

    (CFA, Professor of Finance, D’Amore-McKim School of Business, Northeastern University, Boston, MA 02115.)

  • Emery A. Trahan

    (CFA, Senior Associate Dean, D’Amore-McKim School of Business, Northeastern University, Boston, MA 02115.)

  • Pinshuo Wang

    (Ph.D. Candidate, Department of Economics, College of Social Studies and Humanities, Northeastern University.)

Abstract

Both institutional and individual investors have a vast array of advisory and ratings services to assist with security selection. One of the most prominent sources of stock ratings is Morningstar. This is the first large-scale study evaluating the performance of portfolios formed using Morningstar’s Star rating system for stocks. We evaluate the performance of portfolios formed using this rating system. Our results provide evidence that the Morningstar stock rating system allows an investor to build a portfolio with superior absolute and risk-adjusted returns over a long period of time. We show that a modest transaction cost will reduce, but not eliminate, these benefits. Overall, our results indicate that Morningstar ratings effectively discriminate between over- and undervalued stocks over the long term.

Suggested Citation

  • Paul J. Bolster & Emery A. Trahan & Pinshuo Wang, 2016. "Assessing performance of Morningstar’s star rating system for equity investment," Journal of Economic and Financial Studies (JEFS), LAR Center Press, vol. 4(1), pages 11-22, February.
  • Handle: RePEc:lrc:lareco:v:4:y:2016:i:1:p:11-22
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    References listed on IDEAS

    as
    1. Brad M. Barber & Reuven Lehavy & Brett Trueman, 2010. "Ratings Changes, Ratings Levels, and the Predictive Value of Analysts’ Recommendations," Financial Management, Financial Management Association International, vol. 39(2), pages 533-553, June.
    2. Andrew Metrick, 1999. "Performance Evaluation with Transactions Data: The Stock Selection of Investment Newsletters," Journal of Finance, American Finance Association, vol. 54(5), pages 1743-1775, October.
    3. Brad Barber & Reuven Lehavy & Maureen McNichols & Brett Trueman, 2001. "Can Investors Profit from the Prophets? Security Analyst Recommendations and Stock Returns," Journal of Finance, American Finance Association, vol. 56(2), pages 531-563, April.
    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Asset pricing; investment decisions; ratings and rating agencies; security analyst.;
    All these keywords.

    JEL classification:

    • G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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