The latest trading session saw Marathon Petroleum (MPC) ending at $163.97, denoting a -1.16% adjustment from its last day's close. This move lagged the S&P 500's daily loss of 0.16%. Elsewhere, the Dow lost 0.14%, while the tech-heavy Nasdaq lost 0.06%.Prior to today's trading, shares of the refiner had lost 4.65% over the past month. This has was narrower than the Oils-Energy sector's loss of 7.84% and lagged the S&P 500's gain of 1.96% in that time.The upcoming earnings release of Marathon Petroleum will ...