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Exhibit 21.1

SUBSIDIARIES OF

PLAINS GP HOLDINGS, L.P.

(As of 12/31/2025)

Subsidiary						Jurisdiction of Organization
Advantage Pipeline LLC						Texas
Alpha Crude Holdings LLC						Delaware
Aurora Pipeline Company Ltd.						Canada
Bakersfield Crude Terminal LLC						Delaware
Black Knight Midstream, LLC						Delaware
Cactus II Pipeline LLC						Delaware
Cactus III Crude Holdings GP, LLC						Delaware
Cactus III Crude Holdings, LP						Delaware
Cactus III Crude Services, L.P.						Delaware
Cactus III Crude Marketing, LP						Delaware
Cactus III Crude Pipeline, LP						Delaware
Cactus III Crude Terminal Company, LP						Delaware
Cactus III Pipeline Company, LP						Delaware
Capline Pipeline Company LLC						Delaware
Cheyenne Pipeline LLC						Texas
Eagle Ford Crude Terminal LLC						Delaware
FM Gathering LLC						Delaware
Kern-Southland Energy Link LLC						Delaware
M2 Crude Oil Holdings, LLC						Texas
MDE 2 Holdings, LLC						Delaware
MDE Energy Solutions, LLC						Texas
MDE Midstream 2, LLC						Delaware
MDE Midstream, LLC						Texas
MDE Midstream Services, LLC						Delaware
MDE Pipeline Logistics, LLC						Texas
Midway Pipeline LLC						Delaware
Niobrara Crude Terminal LLC						Delaware
OMOG JV Holdings LLC						Delaware
OMOG JV LLC						Delaware
Oryx Delaware Oil Transport LLC						Delaware
Oryx Midland Oil Gathering LLC						Texas
Oryx Midland Oil Marketing LLC						Delaware
Oryx Midstream Holdings LLC						Delaware
Oryx Wink Oil Pipeline LLC						Delaware
PAA Finance Corp.						Delaware
PAA GP LLC						Delaware
PAA Luxembourg S.a.r.l.						Luxembourg
PAA Midstream LLC						Delaware
PAA Natural Gas Storage, L.P.						Delaware
PAA Service Corp.						Texas
PAA/Vulcan Gas Storage, LLC						Delaware
Pacific Pipeline System LLC						Delaware
Plains AAP, L.P.						Delaware
Plains All American Emergency Relief Fund, Inc.						Texas
Plains All American GP LLC						Delaware

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Subsidiary						Jurisdiction of Organization
Plains All American Pipeline, L.P.						Delaware
Plains BK Holdco LLC						Delaware
Plains Canada Liquid Pipelines ULC						British Columbia
Plains Capline LLC						Delaware
Plains Eagle Ford Energy LLC						Texas
Plains Eagle Ford Gas LLC						Texas
Plains EF Holdings LLC						Delaware
Plains Gas Solutions, LLC						Texas
Plains GP LLC						Texas
Plains LPG Services CA LLC						Texas
Plains LPG Services GP LLC						Delaware
Plains LPG Services, L.P.						Texas
Plains Marketing Bondholder, LLC						Delaware
Plains Marketing CA LLC						Texas
Plains Marketing Canada LLC						Delaware
Plains Marketing, L.P.						Texas
Plains Midstream Canada ULC						British Columbia
Plains Midstream Luxembourg S.a.r.l.						Luxembourg
Plains Midstream Superior LLC						Texas
Plains Oryx Permian Basin LLC						Delaware
Plains Oryx Permian Basin Marketing LLC						Delaware
Plains Oryx Permian Basin Pipeline LLC						Delaware
Plains Pipeline, L.P.						Texas
Plains Pipeline MidCon LLC						Texas
Plains Pipeline Montana LLC						Delaware
Plains Products Terminals LLC						Delaware
Plains Rail Holdings LLC						Delaware
Plains South Texas Gathering LLC						Texas
PMC (Nova Scotia) Company						Nova Scotia
PNGS GP LLC						Delaware
POPB NM Crude II LLC						Delaware
POPBP DE Crude Holdings LLC						Delaware
Rancho LPG Holdings LLC						Delaware
Red River Pipeline Company LLC						Delaware
Rocky Mountain Pipeline Montana LLC						Delaware
St. James Rail Terminal LLC						Delaware
Sunrise Pipeline LLC						Delaware
Western Corridor Pipeline LLC						Delaware