This study examines the effect of non-operating activities on stock return by using all common stocks in Taiwan stock market from 1989 to 2012. We find that long-short portfolios constructed based on non-operating activity information can obtain significant risk-adjusted returns. However, the further tests show that these risk-adjusted returns are largely explained by the ratios of net profit. Finally, we also find that the explanatory power of on stock returns from earnings-to-price is the largest among the other financial ratios.