We present fundamental concepts of risk and propose two methods for risk management of a portfolio in this paper. Moreover, we introduce their novel extensions to trading in multiple frequencies. We use stocks listed in NASDAQ 100 index as the investment universe for our back-testing to highlight the merit of the proposed portfolio risk management methods. 							
						
							
					 															
					Mustafa U. Torun, Ali N. Akansu, Marco Avellaneda