Producer
Marathon Petroleum Corporation
Major US independent refiner (NYSE: MPC, HQ Findlay OH). Gulf Coast facilities: Galveston Bay TX (585,000 bpd — one of the largest US refineries) and Garyville LA (596,000 bpd — one of the largest US refineries by throughput). Marathon's two Gulf Coast refineries together represent more than 1.1 million bpd of capacity — a scale that makes Marathon a critical feedstock buyer from the Permian Basin, offshore Gulf of Mexico, and pipeline imports. MPLX LP (Marathon's MLP) operates crude and product pipelines feeding its refinery network.
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Inputs supplied
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Goods downstream
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Facilities
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Stories
What they make
2 inputs Marathon Petroleum Corporation supplies
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Where it shows up
Goods downstream
Essential goods that depend on something Marathon Petroleum Corporation makes — pick one to see the full supply chain.
Where they make it
2 facilities
Marathon Galveston Bay Refinery — Texas City, TX →
USTexas · refinery
Second largest US refinery at ~585,000 bpd capacity (formerly BP Texas City); Marathon acquired from BP in 2013. Suffered a major explosion in 2005 (pre-Marathon ownership).
Marathon Petroleum Garyville Refinery (LA) →
USLouisiana · refinery
Garyville, LA (St. John the Baptist Parish); 596,000 bpd capacity — one of the largest US refineries. Processes a heavy crude slate including Canadian WCS, offshore Gulf of Mexico sour crude, and Latin American heavy grades via Mississippi River tanker access. Source: https://www.marathonpetroleum.com/Operations/Refining/Garyville/
What else they do
Business segments
The company's full revenue map — where this supply-chain role fits within their broader business.
Gulf Coast Refining (Garyville + Galveston Bay — 1.18M bpd)
70%Asphalt Production (Roads — Same Refinery Stream)
8%MPLX LP (Midstream Pipelines)
18%Retail & Speedway (Historical)
4%
Intelligence
What's known
Sourced claims about this company's role in supply chains — chokepoints, concentration, incidents, dual-use connections.
Did you know2023
Marathon Petroleum's Garyville and Galveston Bay refineries produce both the gasoline that American drivers put in their cars AND the asphalt pavement those same cars drive on — from the same barrels of crude oil, from the same facility. In petroleum refining, crude oil is fractionally distilled: light fractions (gasoline, naphtha) distill first; middle fractions (diesel, kerosene/jet) follow; heavy fractions (fuel oil, asphalt/bitumen) remain last. Marathon oxidizes the heaviest vacuum residue fraction into road-grade asphalt sold to highway paving contractors across the Gulf Coast and Southeast US. The same crude barrel produces the gasoline in the driver's tank AND the asphalt under the driver's wheels. A federal highway infrastructure bill increasing US road construction spending simultaneously increases demand for Marathon asphalt; a gasoline carbon tax simultaneously decreases demand for Marathon gasoline — different policy levers affect different Marathon product lines differently.
Marathon Petroleum Corporation ↗Capacity2023
Marathon Petroleum's MPLX LP controls a critical piece of US energy infrastructure: crude oil gathering pipelines from the Permian Basin and Gulf of Mexico feeding Marathon's Gulf Coast refineries, plus product distribution pipelines moving Marathon gasoline, diesel, and jet fuel to distribution terminals across the US South and Midwest. MPLX's pipeline position makes Marathon vertically integrated from wellhead to wholesale terminal — the same company gathers crude from shale wells, ships it via pipeline to a refinery, converts it to transportation fuel, and ships the fuel to wholesale distribution. This vertical control is strategically significant: in a severe crude oil supply disruption or pipeline outage, Marathon has multiple internal optionality points that purely non-integrated refiners lack. MPLX handles roughly 1.4 million barrels/day of crude gathering and 5.4 million barrels/day of product pipeline throughput.
MPLX LP (Marathon Petroleum) ↗Origin2023
Marathon Petroleum Corporation was spun off from Marathon Oil Corporation (the E&P company) in 2011, separating Marathon's refining and marketing businesses into an independent NYSE-traded company. The Garyville, Louisiana refinery (originally built by Marathon in 1976) was expanded multiple times to become one of the two largest US refineries. Marathon acquired Hess's Torrance CA refinery and Speedway's retail chain in the 2010s, briefly becoming a vertically integrated fuel company from refinery to pump. The 2021 sale of Speedway to 7-Eleven for $21B stripped out the retail channel, returning Marathon to its refining core. Marathon Petroleum (MPC) is now the largest US independent refiner by capacity, operating the Garyville and Galveston Bay refineries that together process ~1.18 million barrels per day — roughly 6-7% of US total refining capacity.
Marathon Petroleum Corporation ↗