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EX-21 3 wmb_20241231x10kxex21.htm EX-21 TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC - Subsidiaries of the registrant.
Exhibit 21
ENTITYJURISDICTION
Arcadia Gas Storage, LLCTexas
Appalachia Midstream Services, L.L.C.Oklahoma
Aurora Hydrogen Inc.Alberta
BPEH-CXL Holdings LLCDelaware
Bargath LLCDelaware
Baton Rouge Fractionators LLCDelaware
Baton Rouge Pipeline LLCDelaware
Black Marlin Pipeline LLCTexas
Blue Racer Finance Corp.Delaware
Blue Racer Midstream, LLCDelaware
Blue Racer Midstream Holdings, LLCDelaware
Blue Racer NGL Pipelines, LLCDelaware
Blue Racer Ohio Compression, LLCDelaware
Bluestem Gas Services, L.L.C.Oklahoma
Bluestem Pipeline LLCDelaware
Branch Midstream Company, LLCTexas
Brazos Permian II, LLCDelaware
Cadeville Gas Storage LLCDelaware
Carbon County UCG, Inc.Delaware
Carbonate Trend Pipeline LLCDelaware
Cardinal Gas Services, L.L.C.Delaware
Cardinal Operating Company, LLCDelaware
Cardinal Pipeline Company, LLCNorth Carolina
Crowheart Energy, LLCDelaware
DMP NEW YORK, INC.New York
Dauphin Island Gathering PartnersTexas
Discovery Gas Transmission LLCDelaware
Discovery Producer Services LLCDelaware
EIC Rose Rock Ventures I, LPDelaware
EIC Deep Carbonization Frontier Fund I LPDelaware
Edge Solar LLCDelaware
Emerging Energy Ventures, LLCDelaware
Encino Environmental Holdings LLCDelaware
Energy Impact Fund II (FT-D) LPDelaware
Energy Impact Fund II LPDelaware
Endeavor Gathering LLCDelaware
Fossett Columbine, LLCDelaware
Gemini Arklatex, LLCDelaware
Gemini Arklatex Services, LLCDelaware


Exhibit 21
ENTITYJURISDICTION
Gemini Carthage Pipeline, LLCDelaware
Gulfstar One LLCDelaware
Gulfstream Management & Operating Services, L.L.C.Delaware
Gulfstream Natural Gas System, L.L.C.Delaware
Hill-Lake Gas Storage, LLCTexas
Ion Clean Energy, Inc.Delaware
Ingu Solutions Inc.New Brunswick
Inland Ports, Inc.Tennessee
Katy Connector Pipeline, LLCDelaware
Kiowa Lateral LLCDelaware
Laurel Mountain Midstream Operating LLCDelaware
Laurel Mountain Midstream, LLCDelaware
LongPath Technologies, Inc.Delaware
Louisiana Energy Gateway LLCDelaware
Louisiana Midstream Gas Services, L.L.C.Oklahoma
Magnolia Midstream Gas Services, L.L.C.Oklahoma
Marsh Resources, LLCDelaware
Mid-Continent Fractionation and Storage, LLCDelaware
Mockingbird Midstream Gas Services, L.L.C.Oklahoma
Monarch Pipeline LLCDelaware
MountainWest Energy Holding Company, LLCUtah
MountainWest Energy Services, LLCUtah
MountainWest Field Services, LLCUtah
MountainWest Overthrust Pipeline, LLCUtah
MountainWest Pipeline Services, LLCUtah
MountainWest Pipeline, LLCUtah
MountainWest Pipelines Holding LLCDelaware
MountainWest Southern Trails Pipeline CompanyUtah
MountainWest White River Hub, LLCUtah
NT Minerals, LLCTexas
New Energy Ventures Holdco, LLCDelaware
NorTex Development Company, LLCDelaware
NorTex Midstream Holdings, LLCDelaware
NorTex Midstream Partners, LLCDelaware
NorTex Trading and Marketing, LLCTexas
Northwest Pipeline LLCDelaware
Ohio Valley Midstream LLCDelaware
Oklahoma Midstream Gas Services, L.L.C.Oklahoma
Orbital Sidekick, Inc.Delaware


Exhibit 21
ENTITYJURISDICTION
Overland Pass Pipeline Company LLCDelaware
Pacific Connector Gas Pipeline, LPDelaware
Parachute Pipeline LLCDelaware
Permian Connector, LLCDelaware
Perryville Gas Storage LLCDelaware
Pine Needle LNG Company, LLCNorth Carolina
Pine Needle Operating Company, LLCDelaware
Pine Prairie Energy Center, LLCDelaware
Ponder Midstream Gas Services, L.L.C.Delaware
Power Eight Project LLCDelaware
Reserveco Inc.Delaware
Rocky Mountain Midstream Holdings LLCDelaware
Rocky Mountain Midstream JV Holdings LLCDelaware
Rocky Mountain Midstream LLCTexas
Rocky Mountain Midstream Marketing LLCTexas
Rocky Mountain Midstream Pipeline LLCTexas
SG Resources Mississippi, L.L.C.Delaware
Sequent Energy Canada LLCDelaware
Sequent Energy Management LLCDelaware
Socagee Midstream Gas Services LLCDelaware
South Mansfield E&P, LLCDelaware
TWC Holdings C.V.Netherlands
Targa Train 7 LLCDelaware
Texas Midstream Gas Services, L.L.C.Oklahoma
The Williams Companies Foundation, Inc.Oklahoma
The Williams Companies International Holdings B.V.Dutch BV
TransCardinal Company, LLCDelaware
TransCarolina LNG Company, LLCDelaware
Transco Exploration CompanyDelaware
Transcontinental Gas Pipe Line Company, LLCDelaware
UEOM NGL Pipelines LLCDelaware
Utica East Ohio Midstream LLCDelaware
Utica Gas Services, L.L.C.Oklahoma
WFS - Liquids LLCDelaware
WFS Dauphin Island, LLC Delaware
WFS Gathering Company, L.L.C.Delaware
WFS Mobile Bay Processing, LLCDelaware
WFS Natural Gas Storage, LLCDelaware
Wamsutter LLCDelaware


Exhibit 21
ENTITYJURISDICTION
Wamsutter E&P, LLCDelaware
White River Hub, LLCDelaware
WilPro Energy Services (El Furrial) LimitedCayman Islands
WilPro Energy Services (Pigap II) LimitedCayman Islands
Williams Acquisition Holding Company LLCNew Jersey
Williams Alaska Petroleum, Inc.Alaska
Williams Blu Operating LLCDelaware
Williams CRE LLCDelaware
Williams CV Holdings LLCDelaware
Williams Cardinal Gas, LLCDelaware
Williams Compression LLCOklahoma
Williams Express LLCDelaware
Williams Express, Inc.Alaska
Williams Field Services - Gulf Coast Company LLCDelaware
Williams Field Services Company, LLCDelaware
Williams Field Services Group, LLCDelaware
Williams Flexible Generation, LLCDelaware
Williams Front Range LLCDelaware
Williams Gas Processing - Gulf Coast Company LLCDelaware
Williams Gilcrest, LLCDelaware
Williams Global Energy (Cayman) LimitedCayman Islands
Williams Global Holdings LLCDelaware
Williams Headquarters Building LLCDelaware
Williams Holdings and Manufacturing LLCDelaware
Williams Hutch Rail Company, LLCDelaware
Williams IP Holdings, LLCDelaware
Williams Information Technology LLCDelaware
Williams International Company LLCDelaware
Williams International El Furrial LimitedCayman Islands
Williams International Pigap LimitedCayman Islands
Williams International Venezuela LimitedCayman Islands
Williams LNG, LLCDelaware
Williams Laurel Mountain, LLCDelaware
Williams MLP Operating, LLCDelaware
Williams Midstream Gas Services LLCOklahoma
Williams Mobile Bay Producer Services, L.L.C.Delaware
Williams Natural Gas Storage, LLCDelaware
Williams Ohio River Valley CorporationDelaware
Williams Ohio River Valley LLCDelaware


Exhibit 21
ENTITYJURISDICTION
Williams Ohio Valley Midstream LLCTexas
Williams Ohio Valley Pipeline LLCDelaware
Williams Oil Gathering, L.L.C.Delaware
Williams PERK, LLCDelaware
Williams Partners Operating LLCDelaware
Williams Petroleum Services, LLCDelaware
Williams Pipeline Services LLCDelaware
Williams Propylene Company LLCDelaware
Williams Resource Center, L.L.C.Delaware
Williams Rocky Mountain Midstream Operating LLCDelaware
Williams Solar Holdco LLCDelaware
Williams Strategic Sourcing Company LLCDelaware
Williams Upstream Holdings, LLCDelaware
Williams WPC - I, LLCDelaware
Worsham-Steed Gas Storage, LLCTexas