The latest trading session saw Valero Energy (VLO) ending at $142.34, denoting a -0.26% adjustment from its last day's close. The stock trailed the S&P 500, which registered a daily gain of 0.61%. Meanwhile, the Dow gained 0.97%, and the Nasdaq, a tech-heavy index, added 0.33%.Coming into today, shares of the oil refiner had gained 6.4% in the past month. In that same time, the Oils-Energy sector lost 2.26%, while the S&P 500 gained 5.36%.The investment community will be closely monitoring the performance o ...