UBS raised its price targets for two major U.S.-listed companies on Monday, citing improved earnings prospects and stronger operating momentum. For Amazon.com Inc., the bank lifted its 12-month target to $271 from $249 while reiterating a Buy rating. UBS said it expects broad-based upside across e-commerce gross merchandise value, advertising and operating profit ahead of Amazon’s second-quarter results. The Swiss lender also increased its target for insurance and consulting firm Aon plc to $400 from $382, pointing to resilient demand for risk-management services.