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这个题目是来自 Bodie, Z., Kane, A., & Marcus, A.J. (2002). Investments: International edition (5th ed.). Sydney: Mc-Graw Hill.
The Case
Hennessy & Associates manages a $30 million equity portfolio for the multi-manager Wilstead Pension Fund. Jason Jones, financial vice president of Wilstead, noted that Hennessy had rather consistently achieved the best record among the Wilstead’s six equity managers. Performance of the Hennessy portfolio had been clearly superior to that of the S&P 500 in four of the past five years. In the one less-favourable year, the shortfall was trivial.
Hennessy is a “bottom-up“ manager. The firm largely avoids any attempt to “time the market.” It also focuses on selection of individual stocks, rather than the weighting of favoured industries.
There is no apparent conformity of style among the six equity managers. The five managers, other than Hennessy, manage portfolios aggregating $250 million made up of more than 150 individual issues.
Jones is convinced that Hennessy is able to apply superior skill to stock selection, but the favourable returns are limited by the high degree of diversification in the portfolio. Over the years, the portfolio generally held 40-50 stocks, with about 2% - 3% of total funds committed to each issue. The reason Hennessy seemed to do well most years was because the firm was able to identify each year 10 or 12 issues which registered particularly large gains.
Based on this overview, Jones outlined the following plan to the Wilstead pension committee:
Let’s tell Hennessy to limit the portfolio to no more than 20 stocks. Hennessy will double the commitments to the stocks that it really favours, and eliminate the remainder. Except for this one new restriction, Hennessy should be free to manage the portfolio exactly as before.
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