It was an ugly start at Tuesday's opening bell with stocks dropping on the strong U.S. dollar, a fresh dip in oil prices and weakness in the European markets. Swiss financial firm, Credit Suisse (CS) is sharply higher after its CEO Brady Dougan confirmed he will step down. The embattled CEO will be replaced by Prudential's (PRU) chief Tidjane Thiam in June. Shares of Urban Outfitters (URBN) popped out of the gate after the retailer beat quarterly earnings. Urban also reported a rise in comparable-store sales for the first time in a year. Twitter (TWTR) has opened an office in Hong Kong. The move comes despite the social microblogger's ban in mainland China.