In the latest trading session, Valero Energy (VLO) closed at $133.75, marking a -0.38% move from the previous day. This change lagged the S&P 500's 0.13% gain on the day. Meanwhile, the Dow experienced a rise of 0.55%, and the technology-dominated Nasdaq saw a decrease of 0.52%.Heading into today, shares of the oil refiner had lost 10.39% over the past month, lagging the Oils-Energy sector's loss of 2.9% and the S&P 500's gain of 3.67% in that time.The investment community will be closely monitoring the per ...