We have maintained our Underperform recommendation on oil refiner and marketer Sunoco Inc (SUN). Lately, investors have been selling the stock for its weak fundamentals and tepid outlook. The disappointing first quarter results have added to this bearishness. Sunoco, which competes in the Oil Refining and Marketing industry with firms like Valero Energy Corp. (VLO) [...] (SUN) Sunoco Analyst Maintains Underperform on Shares