Do Institutional Investors Destabilize Stock Prices? Evidence on Herding and Feedback Trading
This paper uses a new data set of quarterly portfolio holdings of 769 all-equity pension funds between 1985 and 1989 to evaluate the potential effect of their trading on stock prices. We address two aspects of trading by money managers: herding, which refers to buying (selling) the same stocks as other managers buy (sell) at the same time; and positive-feedback trading, which refers to buying winners and selling losers. These two aspects of trading are commonly a part of the argument that institutions destabilize stock prices. At the level of individual stocks at quarterly frequencies, we find no evidence of substantial herding or positive-feedback trading by pension fund managers, except in small stocks. Also, there is no strong cross-sectional correlation between changes in pension funds' holdings of a stock and its abnormal return.
|Date of creation:||Sep 1991|
|Date of revision:|
|Publication status:||published as "The Impact of Institutional Investors on Stock Prices", Journal of Financial Economics, August 1992, vol 32, no. 1, pp 23-43|
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