Who owns Marathon Pipe Line?
Marathon Pipe Line is owned by MPLX (the United States, NYSE: MPLX).[1]
Evidence: MPLX LP Annual Report on Form 10-K filed 2026-02-26, SEC EDGAR, 26 February 2026. Verified from filings; last checked .
Key facts
- Current owner
- MPLX LP verified
- Owner HQ
- 🇺🇸 United States
- Origin
- 🇺🇸 United States
- Category
- Energy › Oil & gas › Pipelines & midstream
- Parent ticker
- NYSE: MPLX
- Last verified
- · 1 sources
About Marathon Pipe Line
Marathon Pipe Line LLC is described in MPLX's 2025 10-K as an indirect wholly owned subsidiary of MPLX, in a legal proceeding note about a crude oil release on the Wood River to Patoka line in Illinois.
What MPLX's annual report says about Marathon Pipe Line
Sentences about Marathon Pipe Line from MPLX's latest annual filing[1], copied word for word.
In March 2022, the State of Illinois brought an action in Madison County Circuit Court in Illinois against Marathon Pipe Line LLC, an indirect wholly owned subsidiary of MPLX, asserting various violations and demanding a permanent injunction and civil penalties in connection with a release of crude oil on the Wood River to Patoka 22-inch line near Edwardsville, Illinois.
How often MPLX names Marathon Pipe Line in its annual report
A plain count of the times the name appears in the text of each annual report, not counting the start of a sentence. A brand that an owner writes about more is usually one it treats as central. The brand is named less often than it was three years earlier.
Ownership timeline of Marathon Pipe Line
Where Marathon Pipe Line sits in MPLX
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full MPLX ownership tree →
See the full MPLX brand portfolio (2) →
Other brands owned by MPLX
MPLX controls 2 brands on Brandtree, 2 of them in energy.
Also in energy
Other brands in pipelines & midstream, and who owns them
The 35 brands in pipelines & midstream on Brandtree belong to 21 owners. The largest is Energy Transfer, with 4.
| Brand | Owner | Owner based in |
|---|---|---|
| Dakota Access Pipeline | Energy Transfer | 🇺🇸 United States |
| Dixie Pipeline | Enterprise Products | 🇺🇸 United States |
| Basin Pipeline | Plains All American | 🇺🇸 United States |
| MountainWest | Williams | 🇺🇸 United States |
| Corpus Christi LNG | Cheniere | 🇺🇸 United States |
| Cenit | Ecopetrol | 🇨🇴 Colombia |
| Enbridge Mainline System | Enbridge | 🇨🇦 Canada |
| Columbia Pipeline Group | TC Energy | 🇨🇦 Canada |
About the owner: MPLX
MPLX is a publicly listed company headquartered in United States. Brandtree records 2 brands under its control, and it is listed as NYSE: MPLX.
MPLX's 2025 Form 10-K says it is a master limited partnership formed by MPC in 2012 that owns midstream infrastructure and logistics assets. As of 31 December 2025, MPC owned its general partner and about 64 percent of its common units, and the filing reports two segments, Crude Oil and Products Logistics and Natural Gas and NGL Services.
🇺🇸 Marathon Pipe Line and other American brands
Brandtree records a controlling owner for 2,399 brands that began in the United States. 461 of them (19%) are now controlled by a company headquartered in another country; Marathon Pipe Line is not one of them.
- AES Ohio — AES 🇺🇸
- Agway Energy Services — Suburban Propane 🇺🇸
- Alabama Power — Southern Company 🇺🇸
- AmeriGas — UGI 🇺🇸
- American Transmission Company — WEC Energy Group 🇺🇸
- Arch Resources — Core Natural Resources 🇺🇸
Frequently asked questions
Who is the parent company of Marathon Pipe Line?
The parent company of Marathon Pipe Line is MPLX, a publicly listed company headquartered in the United States.
Is Marathon Pipe Line American?
Yes. Marathon Pipe Line originated in the United States and its owner, MPLX, is also headquartered in the United States.
Is Marathon Pipe Line still owned by MPLX?
Yes. As of 11 October 2026, Marathon Pipe Line is still owned by MPLX. The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] MPLX LP Annual Report on Form 10-K filed 2026-02-26 — SEC EDGAR, SEC Form 10-K, published 26 February 2026; retrieved 5 October 2026.
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