Institutional Trading and Price Momentum

Chih‐hsien Jerry Yu

International Review of Finance, 2008, vol. 8, issue 1‐2, 81-102

Abstract: This paper aims to explore the effect of institutional trading on the two asymmetric phenomena found by Lee and Swaminathan: (1) asymmetric price momentum: price momentum is more pronounced among high‐turnover stocks; (2) asymmetric return phenomenon: low‐turnover stocks tend to outperform high‐turnover stocks. Lee and Swaminathan use a ‘momentum life cycle’ to explain the asymmetric momentum effect while attributing the asymmetric return phenomenon to the analysts' overestimating (underestimating) the future profitability of high (low)‐turnover firms. However, it essentially needs trading activity to induce both of the above asymmetric results. Because institutional investors exhibit a momentum trading pattern and the trading behavior of institutional investors may have a huge impact on the movement of stock prices, institutional trading may be one of the major driving forces leading to both of the above asymmetric patterns. The empirical results show that, first of all, after controlling for the turnover, the price momentum is still more pronounced among stocks with higher institutional ownership, while high‐turnover stocks no longer exhibit a pronounced momentum effect after controlling for the institutional ownership. Furthermore, stocks with higher institutional ownership have better return performance in any of the turnover groups. While low‐turnover stocks still outperform high‐turnover stocks after controlling for the institutional ownership level, for some winner stocks this is no longer true. The results suggest that the asymmetric momentum effect is not induced by a stock's turnover, but rather it is driven by institutional trading. Turnover is only a proxy for institutional trading. That is, turnover per se has no economic significance in such a momentum phenomenon.

Date: 2008
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