Swiss bank UBS (UBSG.VX) could combine its investment banking arm with that of Credit Suisse (CSGN.VX) to create a top player, Eric Knight, head of activist investor Knight Vinke, was quoted as saying in an interview with a Swiss paper on Sunday. Knight Vinke said last month UBS should look at spinning off or merging its investment bank so the group can focus on its wealth and asset management businesses.