The high-volume return premium

in \Accounting and Finance in Tel-Aviv " for their comments and suggestions. All remaining errors are the authors ’ responsibility. The idea that extreme trading activity (as measured by trading volume) contains information about the future evolution of stock prices is investigated. We nd that stocks experiencing unusually high (low) trading volume over a period of one day to a week tend to appreciate (depreciate) over the course of the following month. This eect is consistent across rm sizes, portfolio formation strategies, and volume measures. Surprisingly, the eect is even stronger when the unusually high or low trading activity is not accompanied by extreme returns, and appears to be permanent. The signicantly positive returns of our volume-based strategies are not due to compensation for excessive risk taking, nor are they due to rm announcement eects. Previous studies have documented the positive contemporaneous correlation between a stock’s trading volume and its return, and the autocorrelation in returns. The high volume return premium that we document in this paper is not an artifact of these results. Finally, we also show that protable trading strategies can be implemented to take advantage of the information contained in trading volume.