Exhibit 21
ENTITY | JURISDICTION | |
Alliance Canada Marketing L.P. | Alberta | |
Alliance Canada Marketing LTD | Alberta | |
Apco Argentina S.A. | Argentina | |
Apco Austral, S.A. | Argentina | |
Apco Oil and Gas International Inc. | Cayman Islands | |
Apco Properties Ltd. | Cayman Islands | |
Arctic Fox Assets, Inc. | Delaware | |
Aspen Products Pipeline LLC | Delaware | |
Aux Sable Liquid Products Inc. | Delaware | |
Aux Sable Liquid Products LP | Delaware | |
Bargath LLC | Delaware | |
Barrett Resources International Corporation | Delaware | |
Baton Rouge Fractionators LLC | Delaware | |
Baton Rouge Pipeline LLC | Delaware | |
Beech Grove Processing Company | Tennessee | |
Bison Royalty LLC | Delaware | |
Black Marlin Pipeline LLC | Texas | |
Carbon County UCG, Inc. | Delaware | |
Carbonate Trend Pipeline LLC | Delaware | |
Cardinal Operating Company, LLC | Delaware | |
Cardinal Pipeline Company, LLC | North Carolina | |
ChoiceSeat, L.L.C. | Delaware | |
D-3 Van Hook Gathering Services, LLC | Delaware | |
Dakota-3 E&P Company, LLC | Delaware | |
Diamond Elk, LLC | Colorado | |
Discovery Gas Transmission LLC | Delaware | |
Discovery Producer Services LLC | Delaware | |
Distributed Power Solutions L.L.C. | Delaware | |
Eagle Gas Services, Inc. | Ohio | |
ESPAGAS USA, Inc. | Delaware | |
F T & T, Inc. | Delaware | |
Fishhawk Ranch, Inc. | Florida | |
FleetOne Inc. | Delaware | |
Fort Union Gas Gathering, L.L.C. | Delaware | |
Goebel Gathering Company, L.L.C. | Delaware | |
Gulf Liquids Holdings LLC | Delaware | |
Gulf Liquids New River Project LLC | Delaware | |
Gulf Star Deepwater Services, LLC | Delaware | |
Gulfstream Management & Operating Services, L.L.C. | Delaware | |
Gulfstream Natural Gas System, L.L.C. | Delaware | |
HI-BOL Pipeline LLC | Delaware | |
Inland Ports, Inc. | Tennessee |
ENTITY | JURISDICTION | |
Laurel Mountain Midstream Operating LLC | Delaware | |
Laurel Mountain Midstream, LLC | Delaware | |
Liberty Operating Company | Delaware | |
Longhorn Enterprises of Texas, Inc. | Delaware | |
MAPCO Alaska Inc. | Alaska | |
MAPCO LLC | Delaware | |
Marsh Resources, LLC | Delaware | |
Mid-Continent Fractionation and Storage, LLC | Delaware | |
Millennium Energy Fund, L.L.C. | Delaware | |
Mockingbird Pipeline, L.P. | Delaware | |
Northwest Argentina Corporation | Utah | |
Northwest Land Company | Delaware | |
Northwest Pipeline GP | Delaware | |
Northwest Pipeline Services LLC | Delaware | |
Overland Pass Pipeline Company LLC | Delaware | |
Pacific Connector Gas Pipeline, LLC | Delaware | |
Pacific Connector Gas Pipeline, LP | Delaware | |
Parachute Pipeline LLC | Delaware | |
Parkco Two, L.L.C. | Oklahoma | |
Pine Needle LNG Company, LLC | North Carolina | |
Pine Needle Operating Company, LLC | Delaware | |
RW Gathering, LLC | Delaware | |
Rainbow Resources, Inc. | Colorado | |
Reserveco Inc. | Delaware | |
Snow Goose Associates, L.L.C. | Delaware | |
SPV, L.L.C. | Oklahoma | |
TWC Holdings C.V. | Netherlands | |
TXG Gas Marketing Company | Delaware | |
Tennessee Processing Company | Delaware | |
The Tennessee Coal Company | Delaware | |
The Williams Companies, International Holdings B.V. | Dutch BV | |
Thermogas Energy LLC | Delaware | |
Touchstar Energy Technologies, Inc. | Texas | |
TransCardinal Company, LLC | Delaware | |
TransCarolina LNG Company, LLC | Delaware | |
Transco Coal Gas Company | Delaware | |
Transco Energy Company, LLC | Delaware | |
Transco Exploration Company | Delaware | |
Transco Gas Company, LLC | Delaware | |
Transco Liberty Pipeline Company | Delaware | |
Transco P-S Company | Delaware | |
Transco Pipeline Services LLC | Delaware | |
Transco Resources, Inc. | Delaware | |
Transcontinental Gas Pipe Line Company, LLC | Delaware | |
Transeastern Gas Pipeline Company, Inc. | Delaware | |
Tulsa Williams Company | Delaware |
ENTITY | JURISDICTION | |
Valley View Coal, Inc. | Tennessee | |
Volunteer — Williams, L.L.C. | Delaware | |
WFS Liquids LLC | Delaware | |
WFS Pipeline LLC | Delaware | |
WFS Enterprises, LLC | Delaware | |
WFS Gathering Company, L.L.C. | Delaware | |
WGP Development, LLC | Delaware | |
WGP Enterprises, Inc. | Delaware | |
WGP Gulfstream Pipeline Company, L.L.C. | Delaware | |
WGP International Canada, Inc. | New Brunswick | |
WGPC Holdings LLC | Delaware | |
WPX Enterprises, Inc. | Delaware | |
WPX Gas Resources Company | Delaware | |
Wamsutter LLC | Delaware | |
Williams Acquisition Holding Company, Inc. (Del) | Delaware | |
Williams Acquisition Holding Company, Inc. (NJ) | New Jersey | |
Williams Acquisition Holding Company LLC | Delaware | |
Williams Aircraft, Inc. | Delaware | |
Williams Alaska Petroleum, Inc. | Alaska | |
Williams Alliance Canada Marketing, Inc. | New Brunswick | |
Williams Arkoma Gathering Company, LLC | Delaware | |
Williams CV Holdings LLC | Delaware | |
Williams Cove Point, Inc. | Delaware | |
Williams Discovery Pipeline, LLC | Delaware | |
Williams Distributed Power Services, Inc. | Delaware | |
Williams Energy Canada, Inc. | New Brunswick | |
Williams Energy Marketing & Trading Europe Ltd | England | |
Williams Energy Services, LLC | Delaware | |
Williams Energy Solutions LLC | Delaware | |
Williams Energy, L.L.C. | Delaware | |
Williams Equities, Inc. | Delaware | |
Williams Exploration Company | Delaware | |
Williams Express, Inc. (AK) | Alaska | |
Williams Express LLC | Delaware | |
Williams Fertilizer, Inc. | Delaware | |
Williams Field Services — Gulf Coast Company, L.P. | Delaware | |
Williams Field Services Company, LLC | Delaware | |
Williams Field Services Group, LLC | Delaware | |
Williams Flexible Generation, LLC | Delaware | |
Williams Four Corners LLC | Delaware | |
Williams GP LLC | Delaware | |
Williams Gas Marketing, Inc. | Delaware | |
Williams Gas Pipeline Company, LLC | Delaware | |
Williams Gas Processing — Gulf Coast Company, L.P. | Delaware | |
Williams Global Energy Cayman Limited | Cayman Islands | |
Williams Global Holdings Company | Delaware |
ENTITY | JURISDICTION | |
Williams Gulf Coast Gathering Company, LLC | Delaware | |
Williams Headquarters Building Company | Delaware | |
Williams Holdings Limited | Barbados | |
Williams Indonesia, L.L.C. | Delaware | |
Williams Information Technology, Inc. | Delaware | |
Williams International Bermuda Limited | Bermuda | |
Williams International Company LLC | Delaware | |
Williams International El Furrial Limited | Cayman Islands | |
Williams International Investments Cayman Limited | Cayman Islands | |
Williams International Jose Limited | Cayman Islands | |
Williams International Ltd Mexico, S. de R.L. de C.V | Mexico | |
Williams International Oil & Gas Venezuela Limited | Cayman Islands | |
Williams International Pigap Limited | Cayman Islands | |
Williams International Services Company | Nevada | |
Williams International Telecommunications Investments Limited | Cayman Islands | |
Williams International Venezuela Limited | Cayman Islands | |
Williams Laurel Mountain, LLC | Delaware | |
Williams Learning Center, Inc. | Delaware | |
Williams Longhorn Holdings, LLC | Delaware | |
Williams Marcellus Gathering LLC | Delaware | |
Williams Memphis Terminal, Inc. | Delaware | |
Williams Merchant Services Company, Inc. | Delaware | |
Williams Mid-South Pipelines, LLC | Delaware | |
Williams Midstream Natural Gas Liquids, Inc. | Delaware | |
Williams Midstream Services, LLC | Delaware | |
Williams Mobile Bay Producer Services, L.L.C. | Delaware | |
Williams NGL Marketing, LLC | Delaware | |
Williams Natural Gas Liquids Canada, Inc. | Alberta | |
Williams Natural Gas Liquids LLC | Delaware | |
Williams New Soda, Inc. | Delaware | |
Williams Oil Gathering, L.L.C. | Delaware | |
Williams Olefins Feedstock Pipelines, L.L.C. | Delaware | |
Williams Olefins, L.L.C. | Delaware | |
Williams One-Call Services, Inc. | Delaware | |
Williams Pacific Connector Gas Operator, LLC | Delaware | |
Williams Pacific Connector Gas Pipeline, LLC | Delaware | |
Williams Partners Finance Corporation | Delaware | |
Williams Partners GP LLC | Delaware | |
Williams Partners Holdings LLC | Delaware | |
Williams Partners L.P. | Delaware | |
Williams Partners Operating LLC | Delaware | |
Williams PERK, LLC | Delaware | |
WILLIAMS PETROLEOS ESPAÑA, S.L. | Spain |
ENTITY | JURISDICTION | |
Williams Petroleum Pipeline Systems, Inc. | Delaware | |
Williams Petroleum Services, LLC | Delaware | |
Williams Pipeline GP LLC | Delaware | |
Williams Pipeline Operating LLC | Delaware | |
Williams Pipeline Partners Holdings LLC | Delaware | |
Williams Pipeline Partners L.P. | Delaware | |
Williams Pipeline Services LLC | Delaware | |
Williams Production — Gulf Coast Company, L.P. | Delaware | |
Williams Production Appalachia LLC | Delaware | |
Williams Production Company, LLC | Delaware | |
Williams Production Holdings LLC | Delaware | |
Williams Production Keystone LLC | Delaware | |
Williams Production Mid-Continent Company | Oklahoma | |
Williams Production RMT Company | Delaware | |
Williams Production Rocky Mountain Company | Delaware | |
Williams Production Ryan Gulch LLC | Delaware | |
Williams Refining & Marketing, L.L.C. | Delaware | |
Williams Relocation Management, Inc. | Delaware | |
Williams Resource Center, L.L.C. | Delaware | |
Williams Soda Holdings, LLC | Delaware | |
Williams Sodium Products Company | Delaware | |
Williams Strategic Sourcing Company | Delaware | |
Williams TravelCenters, Inc. | Delaware | |
Williams Uinta Gathering, LLC | Delaware | |
Williams Underground Gas Storage Company | Delaware | |
Williams WPC — I, Inc. | Delaware | |
Williams WPC — II, Inc. | Delaware | |
Williams WPC International Company | Delaware | |
Williams Western Holding Company, Inc. | Delaware | |
WilPro Energy Services El Furrial Limited | Cayman Islands | |
WilPro Energy Services Pigap II Limited | Cayman Islands |