Our study focuses on entire non-financial companies in Taiwanstock exchange, including OTCand the companies that went private. First, this research uses higher book-to-market ratio to choose companies with good price. Second,this paper extends the F_SCORE by Piotroski (2000) and proposes a new portfolio(Y_SCORE) with an application to the stock market in Taiwan. Y_SCORE incorporates ownership structure, treasury announcement, and Research & Development Intensity, which attract great attention in recent financial literatures. An investment strategy that buys winners under Y_SCORE generates an excess return during financial crisis and non-financial crisis period. The empirical results also show that buys winner and sells losers under Y_SCORE have good expected returns and relative lower risks.
