Marathon Petroleum is the largest U.S. independent refiner by capacity with 2.9 million barrels per day across 13 refineries spanning the Gulf Coast (Galveston Bay, Garyville), Midwest (Detroit, Canton), and West Coast (Martinez, Los Angeles). The company also operates the nation's largest refined product distribution system with ~10,000 miles of pipelines and ~4,000 branded retail locations (Speedway brand), plus a 64% stake in MPLX LP for midstream infrastructure. Stock performance is driven by crack spreads (refining margins), utilization rates, and capital allocation decisions.
EnergyIndependent Oil Refining & Marketinghigh - Refining is a high fixed-cost business with substantial depreciation, maintenance turnarounds ($800M-1B annually), and labor costs. Once refineries achieve 90%+ utilization, incremental throughput drops directly to EBITDA. A 5% increase in utilization can boost operating income by 15-20%. Conversely, margin compression or utilization declines rapidly erode profitability due to fixed cost absorption.