Citigroup and UBS Global Research became the latest Wall Street brokerages to raise their year-end targets for the S&P 500 index, pointing to receding policy risks and resilient corporate earnings. Citi bumped the benchmark index's target to 6,600 from 6,300 and UBS to 6,100 from 5,500, implying an upside of 3.2% and a downside of 4.7% respectively to the index's last close.