Marathon Petroleum Corporation

NYSE: MPC

Updated Mar 29, 2026

Profile compiled and reviewed by the Houston Oil Companies Data Team from public filings and company sources.

Refining · Refining & Marketing

Marathon Petroleum Corporation

MPC

Marathon Petroleum is the largest petroleum refining company in the US with significant operations and trading presence in Houston.

Founded: 2011
Employees: 18,000+
Revenue: $150 billion (2023)
HQ: Findlay, OH (major Houston operations)

Petroleum RefiningMidstream (MPLX)Galveston Bay RefineryFuel Marketing

Marathon Petroleum Corporation is the largest petroleum refining company in the United States, with a refining capacity of approximately 2.9 million barrels per day. While headquartered in Findlay, Ohio, the company has a major operational presence in Houston through its Galveston Bay refinery (one of the largest in the US) and MPLX LP, its midstream partnership.

Headquarters

Findlay, OH (major Houston operations)

Founded

2011

Employees

18,000+

Revenue

$150 billion (2023)

CEO

Maryann Mannen

Website

marathonpetroleum.com

History of Marathon Petroleum Corporation

Marathon Petroleum was spun off from Marathon Oil Corporation in 2011. The company dramatically expanded its refining portfolio through the acquisition of Andeavor (formerly Tesoro) in 2018 for $23 billion, which made it the largest US refiner. Its Galveston Bay refinery in Texas City, near Houston, is one of its flagship facilities.

Operations & Business Segments

Marathon Petroleum operates 13 refineries with a combined capacity of ~2.9 million barrels per day. Its Galveston Bay refinery in Texas City (Houston area) has a capacity of approximately 593,000 barrels per day. The company also operates through MPLX LP (midstream) and its Speedway retail brand (sold to 7-Eleven).

Headquarters Location

Findlay, OH (major Houston operations)

Key Specialties & Capabilities

Petroleum RefiningMidstream (MPLX)Galveston Bay RefineryFuel MarketingAsphaltRenewable Diesel

Frequently Asked Questions About Marathon Petroleum Corporation

Is Marathon Petroleum in Houston?▾

Marathon Petroleum is headquartered in Findlay, Ohio, but has significant Houston-area operations including its massive Galveston Bay refinery in Texas City, one of the largest refineries in the United States.

How big is Marathon Petroleum?▾

Marathon Petroleum is the largest petroleum refining company in the US with approximately 2.9 million barrels per day of refining capacity across 13 refineries.

What is Marathon Petroleum's Galveston Bay refinery?▾

The Galveston Bay refinery in Texas City, near Houston, is one of Marathon Petroleum's largest facilities with a capacity of approximately 593,000 barrels per day.

What does Marathon Petroleum Corporation do in Houston?▾

Marathon Petroleum Corporation is a refining company based in Findlay, OH (major Houston operations). Marathon Petroleum is the largest petroleum refining company in the US with significant operations and trading presence in Houston.

Where is Marathon Petroleum Corporation headquartered?▾

Marathon Petroleum Corporation is headquartered in Findlay, OH (major Houston operations), founded in 2011. The company operates in Houston's energy corridor as part of the refining sector.