Posted: 7 Sep 1999
Date Written: September 1994
We examine the investment strategies of 155 mutual funds over the 1975-84 period to determine the extent to which the funds purchased stocks based on their past returns, and to determine the relation of this behavior to their observed portfolio performance. We find that about 77% of these mutual funds were "momentum investors", buying stocks that were past winners; however, they did not systematically sell past losers. On average, these "trend-followers" realized significantly better performance than the remaining funds. We also find that the mutual funds exhibited herding behavior, and that the tendency of a fund to herd in its trades was strongly correlated with its tendency to buy past winners as well as with its portfolio performance. Consistent with the evidence on trend-following, herding into past winners was stronger than herding into past losers.
JEL Classification: G10
Suggested Citation: Suggested Citation
Grinblatt, Mark and Titman, Sheridan and Wermers, Russ, Momentum Investment Strategies, Portfolio Performance, and Herding: A Study of Mutual Fund Behavior (September 1994 ). Available at SSRN: https://ssrn.com/abstract=5686