Within the field of momentum effects, we investigates whether a zero-investment strategy, where a short position in a portfolio of previously bad performing stocks finance a long position in a portfolio of past well performing stocks, generate positive returns in the period 1987 to 2008. The primary focus is to examine whether it is possible to earn abnormal returns from such a strategy and if these returns can be explained by various types of risk measures. We also investigate if we can observe any kind of persistence pattern among the included portfolio companies. We find that several...