EX-21.1 7 mplx-20251231xex211.htm EX-21.1
Exhibit 21.1
MPLX LP
LIST OF SUBSIDIARIES
as of December 31, 2025

Name of Subsidiary | Jurisdiction of Organization/Incorporation
Andeavor Field Services LLC | Delaware
Andeavor Logistics LLC | Delaware
Andeavor Midstream Partners GP LLC | Delaware
Andeavor Midstream Partners LP | Delaware
Asphalt Terminals LLC | Delaware
BANGL Operating, LLC | Delaware
BANGL, LLC | Delaware
Blanchard Terminal Company LLC | Delaware
Canton Refining Logistics LLC | Delaware
Catlettsburg Refining Logistics LLC | Delaware
Detroit Refining Logistics LLC | Delaware
Galveston Bay Refining Logistics LLC | Delaware
Garyville Refining Logistics LLC | Delaware
Hardin Street Marine LLC (d/b/a MPLX Marine) | Delaware
Hardin Street Transportation LLC | Delaware
Marathon Pipe Line LLC (d/b/a Marathon Pipe Line (Delaware) LLC) | Delaware
MarkWest Agua Blanca Pipeline, L.L.C. | Delaware
MarkWest Bluestone Ethane Pipeline, L.L.C. | Delaware
MarkWest Energy East Texas Gas Company, L.L.C. | Delaware
MarkWest Energy Operating Company, L.L.C. | Delaware
MarkWest Energy Partners LLC | Delaware
MarkWest Energy West Texas Gas Company, L.L.C. | Delaware
MarkWest Hydrocarbon, L.L.C. | Delaware
MarkWest Liberty Bluestone, L.L.C. | Delaware
MarkWest Liberty Ethane Pipeline, L.L.C. | Delaware
MarkWest Liberty Gas Gathering, L.L.C. | Delaware
MarkWest Liberty Midstream & Resources, L.L.C. | Delaware
MarkWest Liberty NGL Pipeline, L.L.C. | Delaware
MarkWest Mariner Pipeline, L.L.C. | Delaware
MarkWest Ohio Fractionation Company, L.L.C. | Delaware
MarkWest Oklahoma Gas Company, L.L.C. | Oklahoma
MarkWest Panola Utility Company, L.L.C. | Delaware
MarkWest Pioneer, L.L.C. | Delaware
MarkWest Pipeline Company, L.L.C. | Texas
MarkWest Ranger Pipeline Company, L.L.C. | Delaware
MarkWest Tornado GP, L.L.C. | Delaware
MarkWest Utica Operating Company, L.L.C. | Delaware

MPL Louisiana Holdings LLC | Delaware
MPLX Delaware Basin LLC | Delaware
MPLX Fuels Distribution LLC | Delaware
MPLX Operations LLC | Delaware
MPLX Ozark Pipe Line LLC | Delaware
MPLX Terminal and Storage LLC | Delaware
MPLX Terminals LLC | Delaware
MPLXIF LLC | Delaware
Mt. Airy Terminal LLC | Delaware
MWE GP LLC | Delaware
Northwind Delaware Holdings LLC | Delaware
Northwind Management Holdings LLC | Delaware
Northwind Management LLC | Delaware
Northwind Midstream Operating LLC | Delaware
Northwind Midstream Partners LLC | Delaware
Northwind Midstream Sub I LLC | Delaware
Ohio Condensate Company, L.L.C. | Delaware
Ohio River Pipe Line LLC | Delaware
Robinson Refining Logistics LLC | Delaware
Tesoro Alaska Pipeline Company LLC | Delaware
Tesoro Alaska Terminals LLC | Delaware
Tesoro Great Plains Gathering & Marketing LLC (d/b/a Patterson Rail Terminal) | Delaware
Tesoro High Plains Pipeline Company LLC | Delaware
Tesoro Logistics Finance Corp. | Delaware
Tesoro Logistics Northwest Pipeline LLC | Delaware
Tesoro Logistics Operations LLC | Delaware
Tesoro Logistics Pipelines LLC | Delaware
Tesoro SoCal Pipeline Company LLC | Delaware
Triple Streams Gathering LLC | Delaware
West Relay Gathering Company, L.L.C. | Delaware
Western Refining Conan Gathering, LLC | Delaware
Western Refining Delaware Basin Storage, LLC | Delaware
Western Refining Pipeline, LLC | New Mexico
Western Refining Terminals, LLC | Delaware
WNRL Energy GP, LLC | Delaware
WNRL Energy, LLC | Delaware
Woodhaven Cavern LLC | Delaware