We use an empirical model to categorize firms into portfolios based on operational risk. Using these portfolios, we … show that a strategy of buying firms in the highest decile of operational risk and shorting firms in the lowest decile of … operational risk earned a positive but insignificant risk-adjusted average return of 0.72% per month from 1990 to 2000. However …

increase. Finally, the earnings announcement return is higher for firms with greater political risk, small firms, complex firms …

Risk estimation or volatility estimation at financial markets, particularly stock exchange markets, is complex issue of … pricing of stocks and better risk management. The aim of this research is to test applicability of simple models like Simple … Moving Average (SMA) and Exponentially Weighted Moving Average (EWMA) to estimate risk. The performance of SMA and EWMA with …