Piotroski som investeringsstrategi : Test och utveckling av F_SCORE

Sammanfattning: This paper uses a fundamental investment strategy model developed by Piotroski (2000), called F_SCORE. The model uses accounting-based ratios applied for portfolios of high book-to-market firms. The aim of the study is to test the model for the US stock market during the years 1998-2015, as well as to develop it. The first test uses the original model during the specified time period. The next step is to develop the model by using correlations between each of the signals and future returns that Piotroski (2000) has proven to exist. The test showed that the F_SCORE outperforms the market during the time period. In the developed model the return can be increased even further. The result shows that the market adjusted return can be increased by an average of 24.7 % annually. The developed model thereby generates a better market adjusted return than Piotroski's original model.