MPLX LP (MPLX) Business Profile

What it does

MPLX LP is a master limited partnership that owns and operates energy infrastructure across the United States. Formed in 2012 by Marathon Petroleum, known as MPC, it moves, stores and handles crude oil, refined fuels, natural gas and natural gas liquids, or NGLs. Maryann Mannen is its president and chief executive officer.

Its customers include MPC, other oil and gas producers, and businesses that need transportation, storage or processing services. MPLX’s assets include pipelines, terminals, storage caverns, refinery equipment, inland marine vessels and facilities that treat and process gas. It also distributes fuels on MPC’s behalf.

The business has two segments. Crude Oil and Products Logistics gathers, transports, stores and distributes crude oil, refined products and other materials. It also provides refinery logistics and marine transportation. Natural Gas and NGL Services gathers gas from wells, removes contaminants and separates heavier liquids from the gas. It then transports, stores and markets those liquids, and can separate them further into products such as ethane and propane.

MPLX has long-term agreements with MPC and producer customers. Its common units trade on the New York Stock Exchange, and MPC owns its general partner and a majority of its common units.

How it makes money

MPLX earns fees for moving, storing, processing and distributing energy products, as well as revenue from product sales. Its Crude Oil and Products Logistics segment charges tariffs for gathering and transporting products through pipelines and barge docks, and fees for storage. Its marine business earns revenue under a capacity contract with MPC. MPLX also receives operating fees for running pipelines owned by, or partly owned by, MPC.

MPC pays MPLX for scheduling and marketing fuels based on the volume of MPC products sold each month. Many of the partnership’s transportation, terminal and storage agreements with MPC are long-term and fee-based. Most include minimum volume commitments: under certain agreements, MPC pays a deficiency fee if it does not use the committed volume. Some agreements allow deficiency payments to be credited against excess volumes in later periods. Certain storage fees are payable regardless of whether MPC fully uses the capacity.

The Natural Gas and NGL Services segment earns revenue from gathering, treating and processing natural gas, as well as transporting, fractionating, storing and marketing NGLs. Its contracts include fee-based, percent-of-proceeds, keep-whole and purchase arrangements. For products purchased after services are provided, MPLX reports sales revenue on a gross basis.

In FY2025, Crude Oil and Products Logistics revenue was $6.6 billion. In the third quarter of 2026, MPLX reported adjusted EBITDA of $1.9 billion.

Customers and how it sells

MPLX serves MPC under agreements covering transportation, terminals, storage, marine capacity and fuels distribution. MPC also owns the partnership’s general partner and a majority of its common units. MPLX’s crude oil and products assets are connected to MPC’s refineries and terminals, and MPC is a large source of revenue.

The partnership also serves producers across crude oil and natural gas resource areas, including the Marcellus and Utica shales, the Permian Basin, the STACK Shale and the Bakken Shale. Its systems connect wells to treatment and processing facilities, downstream pipelines and markets for natural gas and NGLs. In the Marcellus, MPLX processes and fractionates gas for EQT and Range and gathers gas for one of them.

Its fuels distribution network includes retail locations owned or operated by independent entrepreneurs. Terminals handle products arriving or leaving by pipeline, rail, marine vessel and truck. MPLX’s pipeline and dock services reach domestic and international destinations, while its Gulf Coast projects are intended to add connections to export infrastructure.

Suppliers and costs

MPLX depends on third parties to supply the crude oil, natural gas, refined products and NGLs handled by its infrastructure. It does not identify a sole-source supplier in the available business descriptions. Rather than manufacturing equipment, the partnership operates pipelines, terminals, gas processing plants, fractionators and other facilities.

Its costs include operating and maintaining those assets, repairing equipment, paying employees and complying with safety and environmental requirements. All employees who conduct its business are employed by affiliates of its general partner. MPLX reimburses MPC for certain operational and management services and pays a fixed annual fee for executive management services.

Some pipeline operating agreements reimburse MPLX for costs incurred on assets it operates for MPC or joint ventures. MPLX also incurs capital expenditures to build and expand infrastructure. In the third quarter of 2026, it recorded $77 million of incentive compensation expense, including charges related to bonus and long-term incentive programs.

Competitive position

In crude oil and products logistics, MPLX competes with independent pipeline and terminal companies, integrated petroleum companies, refiners, marketers and distributors. Competition for oil supplies depends on price, the services offered, facility location and connections to markets. In natural gas and NGL services, competitors include other midstream providers, producers, pipelines and transporters. Customers consider fees, reliability, operating efficiency, access to markets and proximity to supplies. No individual competing company is identified in the supplied business descriptions.

Our reading: MPLX’s physical connections to MPC’s refineries and terminals, together with long-term agreements, provide a meaningful competitive advantage for its crude and products business. Those agreements do not eliminate volume exposure: reduced purchases from MPC’s customers could leave MPLX handling only minimum committed volumes.

Our reading: The combination of gathering, processing, fractionation and market connections supports MPLX’s position with gas producers, because it can provide several services along the route from well to market. That advantage varies by location: proximity to wells and access to downstream markets are important competitive factors, and some competitors may have greater capital resources or contracted gas supplies.

Growth opportunities

MPLX is investing in natural gas and NGL infrastructure, including processing, pipelines, fractionation and export facilities. It expects growing natural gas demand for electricity generation and access to export markets to support opportunities for its producer customers and its own network.

In the third quarter of 2026, Harmon Creek III began operating, adding 300 million cubic feet per day of gas processing and 40,000 barrels per day of deethanization capacity. MPLX and its joint venture partners also reached a final investment decision on the Solitude Pipeline System. MPLX expects the project to provide an additional 4.5 billion cubic feet per day of natural gas capacity out of the Permian Basin and enter service in late 2029.

The company expects its first Gulf Coast fractionator, associated purity pipeline and joint venture LPG export facility to enter service in the first half of 2028. It expects a second fractionator to begin operations in 2029. MPLX also expects to expand sour gas treating capacity at its Titan complex to over 400 million cubic feet per day by year-end.

In 2026, MPLX announced a $750 million divestiture of midstream assets supporting the St. Paul Park and Mandan refineries. It expects to redeploy proceeds toward its growth plans in the Permian and Marcellus basins. MPLX has said the sale presents a headwind to 2027.

Structural risks

• Production and volumes: A significant decrease in crude oil or natural gas production in MPLX’s operating areas, interruptions at customer facilities, or difficulty retaining customers could affect its business. The partnership depends on third parties for the products it handles.
• MPC relationship: MPC could fail to meet its obligations or materially suspend, reduce or terminate commitments. MPLX also identifies potential conflicts between MPC’s interests and those of MPLX and its unitholders.
• Operating hazards: Accidents, severe weather and other physical events can damage assets, interrupt operations and cause environmental damage. Maintenance and repair costs can rise, and some losses may be uninsured.
• Commodity and contract exposure: The mix of natural gas and NGL contracts can change with producer preferences and market conditions, affecting exposure to commodity prices. MPLX also faces the risk that it cannot raise fees enough to cover costs.
• Debt and regulation: Substantial debt, higher interest rates and customer credit risk can affect MPLX. Environmental and pipeline safety rules can lead to compliance costs, while regulated pipeline rates and service terms can be challenged.
• Partnership structure: Unitholders face tax risks inherent in the master limited partnership structure, as well as limited voting rights and limited recourse if dissatisfied with operations.

Bottom line

Our reading

MPLX is an infrastructure business built around moving and processing oil, gas and liquids, with long-term fees and commitments supporting much of its revenue. Its connection to MPC provides both contracted business and customer concentration, while its gas and NGL investments expand its exposure to producer activity and project execution. Commodity-linked contracts, operating hazards, debt and the partnership’s ownership structure remain important alongside the contracted revenue.