Blair Wells LLC · Est. October 9, 2014 · Permian Basin Entity Database
| Old Entity Name ↕ | New Name / Status / Notes ↕ | Additional Notes |
|---|---|---|
| 101 Energy Corporation | Same (Subsid: Crawley Petroleum Corporation) | |
| 1400 Corp. | Conquest Exploration Company | |
| 201 Corporation | Centurion Corporation | |
| 3300 Corp. | Conquest Exploration Company | |
| 3DX Technologies Inc. (Houston) | Esenjay Exploration Inc. | |
| 3Tec Energy Corp. | Same (Houston) | |
| 3TEC Energy Corporation | Plains Exploration & Production Company | |
| 906 Olive Corporation | Same (Affil: Meridian Oil, Inc.) | |
| A & J Oil Company | Thomas, Nelson R. | |
| A & K Petroleum Company | Kerr-McGee Corporation | |
| A-1 Bit & Tool | Same (Subsid: Homco International, Inc. | |
| A-2 Acquisitions Partnerships (1996 & 1997) | Dissolved into (A-2 Resources Corp.) | |
| A-2 Development and Production Company | Same (Subsid: A-2 Resources Corp.) | |
| A-2 Energy and Exploration Partners, LLC | Same (Subsid: A-2 Resources Corp.) | |
| A-2 Exploration Corp. | Same (Subsid: A-2 Resources Corp.) | |
| A. F. D. Capital Group Inc. | Same | |
| AA Development Corporation | AA Energy Corporation | |
| AA Energy Corporation | Same | |
| AA Minerals Corporation | Supron Energy Corporation | |
| Aaron Oil Corporation | Altmark Energy Inc. | |
| Abaca Oil Company | Mapco Production Company | |
| Abacan Resource Corp. | Same | |
| Abbeville Operating Corp. | Bintliff, D.C. | |
| Aberdeen American Petroleum Company, Inc. | Same | |
| Aberdeen Oil & Gas Corporation | Aberdeen Petroleum Corporation | |
| Aberdeen Petroleum Corporation | Adobe Royalty, Inc. | |
| Abney Oil Co. | P & O Falco, Inc. | |
| Abraxus Petroleum Corporation | Same | |
| Acacia Natural Gas Corporation | Same (Subsid: DevonEnergy Corp) | |
| Acadi Energy Company | Oxoco, Inc. | |
| Acadian Gas GP | Tejas Gas | |
| Access Energy Corp. | Enron Gas Service Corp. | |
| Acquisition – VI Corporation | Louis Dreyfus Natural Gas Corp. | |
| Ada Belle Oil Company | Penn-Virginia Resources Corp. | |
| ADA Resources Corp. | Adams Resources & Energy, Inc. | |
| Adams Resources & Energy, Inc. | Same | |
| Addax Petroleum Corporation | Same | |
| Addington Brothers Mining Co. | Ashland Oil, Inc. | |
| Adena Exploration | Dissolved (See notes in back) | |
| Adobe Acquisition Corp. | High Plains Oil Corporation | |
| Adobe Oil and Gas Corp. | Adobe Royalty, Inc. | |
| Adobe Resources Corp | Santa Fe Energy Resources | |
| Adobe Resources Corporation | Santa Fe Energy Resources, Inc. | |
| Adobe Royalty, Inc. | Adobe Resources Corporation | |
| Advance Energy Partners | Matador Resources | |
| AEC Gas Company | Encana Corp | |
| AEC Gulf of Mexico Inc. | Encana Corp | |
| AEC Oil and Gas (USA) Inc. | Encana Corp | |
| AETNA Oil Co. | Ashland Oil & Refining Company | |
| Agate Petroleum Inc. (N. Dakota Properties) | Nance Petroleum Corporation | |
| Agate Petroleum, Inc. | St. Mary Land & Exploration Company (all US properties except N. Dakota) | |
| AGM Corp. | Diamond Shamrock, Inc. | |
| Aikman Brothers, Inc. | Same | |
| Aikman Oil Corp. | Aikman Brothers, Inc. | |
| Akin, Matthew | Same | |
| Aladdin Oil Corp. | Same (Los Angeles) | |
| Alagasco Energy Company, Inc. | Taurus Exploration, Inc. | |
| Alamo Inc. | Columbia Gas System, Inc. | |
| Alamo Oil & Gas LTD-I | Same (Affil: Torch Energy Corporation) | |
| Alamo Oil & Gas LTD-II | Same (Affil: Torch Energy Corporation) | |
| Alamo Petroleum | Amax Petroleum | |
| Alamo Petroleum, Inc. | Equitable Petroleum Corp. | |
| Alanman Energy, Inc. | Same | |
| Alanmar Oil Company | Alanmar Energy, Inc. | |
| Alaska Interstate Company | Union Texas Petroleum Corp. | |
| Albantu Oil & Gas Corporation | Socony Mobil Oil Company, Inc. | |
| Alberta Energy Company, Ltd. | EnCana Oil & Gas, Ltd. | |
| ALCO Oil & Gas Corp. | Ladd Petroleum Corp. | |
| ALCOA, Inc. | Same | |
| Alder Oil Company | ESCO, Inc. | |
| ALECO, Inc. | Same | |
| Alene Oil Company | Tenkay Resources, Inc. | |
| Alexander Energy Corporation | National Energy Group, Inc. (Dallas) | |
| Alexander/Alene/Alliance | Am. Natural/Tenkay/Allco | |
| Alf Corporation (USA) | Same | |
| Alf Energy Companies | Alf Corporation (USA) | |
| Alf Oil Company | Alf Energy Companies | |
| Alfonso Production Company | Cash Reserve Investments, Ltd. | |
| Allegro Petroleum, Inc. | North Star Resources, Ltd. | |
| Allen Oil Company | Ladd Petroleum Corp. | |
| Allen Oil Tools, Inc. | Kencope Energy Co. | |
| Alliance Drilling Company | Same | |
| Alliance Exploration Corporation | South Hampton Mineral Corp. | |
| Alliance Operating, Inc. | Gulfstream Resources, Inc. | |
| Alliance Resources (USA) Inc. | Same (Subsid: Alliance Resources PLC) | |
| Allied Ashland Oil Company | Ashland Oil Company | |
| Allied Chemical Corporation | Union Texas Natural Gas Corp. | |
| Allied Consolidated Energy Inc. | Allied Oil & Gas Corp. | |
| Allied Materials Corp. | Entex Petroleum, Inc. | |
| Allied Oil & Gas Corp. | Same (Houston) | |
| Allis-Chalmers Energy, Inc. | Same (Houston) | |
| Alminex Ltd. | Mobil Oil Corporation | |
| ALN Resources Corp. | American Natural Energy Corp. | |
| Alpha – Omega, Inc. | Omega Corporation | |
| Alpha Energy Corp. | Liquidated | |
| Alta Energy Corp. | Devon Energy Corp. | |
| Altair Oil & Gas Company | Mesa Petroleum Company | |
| Alterio Resources Ltd. | Paragon Petroleum Corp. | |
| Altex Energy Corp. | Altex Industries | |
| Altex Industries | Same | |
| Altmark Energy Inc. | Same | |
| Altura Energy Ltd. | Occidental Petroleum | |
| Altura Energy, Ltd. | Same | |
| Aluminum Company of America | ALCOA, Inc. | |
| Amacan Resources Corp. | Spire International Corp. | |
| Amalgamated Bonanza Petroleum Co. | Chevron USA, Inc. | |
| Amarex, Inc. | Temex Energy, Inc. | |
| Amarillo Minerals, Inc. | Pioneer Nuclear, Inc. | |
| Amarillo Oil Company | Pioneer Production Corp. | |
| Amax Oil & Gas, Inc. | Universal Resources Corp. | |
| Amax Petroleum | Legacy Consolidated | |
| Amax Petroleum Corp. | CRA, Inc. | |
| Amax, Inc. | Cyprus Minerals Company | |
| Ambassador Petroleum Corp. | Anadarko Production Company | |
| Amber Oil Company | National Energy Group, Inc. (Dallas) | |
| Amber Resources Co. | Delta Petroleum Corp. | |
| Ambrit Energy Corporation | Castle Energy Corp. | |
| AMCAN Oil Corp. | Aminoil USA, Inc. | |
| AmCog Acquisition Corp. | Same (Subsid: American Exploration Company) | |
| Amerac Energy Corporation (Houston) | Southern Mineral Corp. | |
| Amerada Corp. | Amerada Petroleum Corp. | |
| Amerada Hess Corporation (New York City) | Same | |
| Amerada Petroleum Company | Amerada Hess Corporation | |
| Ameredev II | Matador Resources | |
| American Corporate Resources, Inc. | Same (Affil: Meridian Oil Inc.) | |
| American Eagle Petroleums Ltd. | CS Resources Ltd. | |
| American Energy Exploration Company | Same | |
| American Exploration Company | Louis Dreyfus Natural Gas Corp. | |
| American Exploration Drilling | Pinto, Joseph | |
| American Exploration Gas Systems Corp. | Louis Dreyfus Natural Gas Corp. | |
| American Exploration Production Company | Same (Subsid: Louis Dreyfus Natural Gas Corp.) | |
| American Independent Oil Company | Aminoil USA, Inc. | |
| American International Petroleum Corp. | Aztec Energy Corp. | |
| American Liberty Oil Company | American Petrofina Co. of Tex. | |
| American Marracaibo Oil Company | Felmont Oil Corporation | |
| American National Petroleum Co. | Patrick Petroleum Co. | |
| American Natural Energy Corp. | Alexander Energy Corporation | |
| American Natural Gas Production Company | ANR Production Company | |
| American Natural Resources Corp. | ANR Production Company | |
| American Oil & Gas Inc. | Same (JV: North Finn LLC & Tower Columbia Corporation) | |
| American Oil Company | AMOCO Oil Company | |
| American Oil Company of Texas | Mobil Oil Corporation | |
| American Pacific International Corp. | Petro-Lewis Corp. | |
| American Petrofina Co. of Texas | Subsid: American Petrofina, Inc. | |
| American Petrofina, Inc. | Fina Oil and Chemical Company | |
| American Promax Inc. | Same (Vancouver, BC) | |
| American Public Energy Company | Amquest Corp. | |
| American Quasar Petro. Co. of N.M. | Wolverine Exploration Company | |
| American Republic Oil Company | Sinclair Oil Company | |
| American Reserve Corp. | Same (Subsid: Louis Dreyfus Natural Gas Corp.) | |
| American Resources of Delaware, Inc. | Same | |
| American Royalty Petroleum Company | Crescent Oil and Gas Corporation | |
| American Trading & Production Corp. | ATAPCO | |
| Americex, Inc. | Same | |
| Ameriplor Corp. | Same (Subsid: American Exploration Company) | |
| Ameroil Energy Corp. | ALN Resources Corp. | |
| Amerox Acquisition Corp. | Same (Subsid: American Exploration Company) | |
| Amex Oil Company | Same (Subsid: American Exploration Company) | |
| AMINI Oil Company | Teal Exploration, Ltd. | |
| Aminoil USA, Inc. | Phillips Petroleum Company | |
| Aminoil, Inc. | Phillips Oil Company | |
| Amistad Land & Cattle Company, Inc. | Spike Box Land & Cattle Company, Inc. | |
| Amkan Acquisition Corp. | Same (Subsid: American Exploration Company) | |
| Amoco Corporation | BP | |
| AMOCO Oil Company | AMOCO Production Company | |
| AMOCO Production Company | BP Amoco, Inc. | |
| AMPOL Exploration Company | AMPOLEX (USA) Inc. | |
| AMPOLEX (USA) Inc. (Denver) | Same | |
| Amquest Corp. | Same | |
| AMR Energy Corp. | Toga Petroleum Company | |
| AMVEST Corp. | Same (Charlottesville, VA) | |
| AMVEST Osage Inc. | Constellation Energy Partners LLC | |
| Anaconda Copper Mining Co. | BP | |
| Anaconda Gold and Silver Company | Anaconda Mining Company | |
| Anaconda Mining Company | Atlantic Richfield Company | |
| Anadarko Land and Exploration Company | ALECO, Inc. | |
| Anadarko Petroleum Corporation | Same | |
| Anadarko Production Company | Anadarko Petroleum Corporation | |
| Anchor Bay Corp. | Same | |
| Anderman/Smith Operating Co. | Same | |
| Andermen Oils Wyoming, Inc. | Heritage Energy Resources, Inc. | |
| Anderson-Prichard Oil Company | APCO, Inc. | |
| Anderson, Carl B. | Same (also See Anson Company) | |
| Anderson, Harold J., Inc. | Same (New Orleans) | |
| Andover Oil Company | Santa Fe Andover Oil Company | |
| Andrews Production Company | Same | |
| Anflo, Clar, Welfeit | Indian Royalty Company | |
| Angeles Corp. | Saxon Oil Development Partners | |
| Anglo Energy, Inc. | Nabors Industries, Inc. | |
| Anglo Energy, Ltd. | Rosewood Resources, Inc. | |
| Anglo-Iranian Oil Company | BP | |
| Anglo-Persian Oil Company | BP | |
| ANM Services Corp. | Same (Subsid: American Exploration Company) | |
| ANR | Same (Subsid: Coastal Oil and Gas Corporation) | |
| ANR Limited Inc. | ANR Production Company | |
| ANR Production | Coastal Corp. | |
| ANR Production Company | Same (Subsid: Coastal Oil and Gas Corporation) | |
| Anran Corporation | Same | |
| Anschutz Corporation (Denver) | Same | |
| Anschutz Dunwoody Drilling Co. Inc. | Anschutz Corporation | |
| Anschutz Gold Coast Corp. | Same (Subsid: Anschutz Corporation) | |
| Anschutz Investment Company | Same (Subsid: Anschutz Corporation) | |
| Anschutz Overseas Corp. | Same (Subsid: Anschutz Corporation) | |
| Anschutz Permain Corp. | Same (Subsid: Anschutz Corporation) | |
| Anschutz Western Corp. | Same (Subsid: Anschutz Corporation) | |
| Anschutz Wyoming Corp | Same (Subsid: Anschutz Corporation) | |
| Anson Company | Chesapeake Mid-Continent Corp. | |
| AnSon Corporation | Chesapeake Mid-Continent Corp. | |
| AnSon Gas Corporation | Same (Affil: Anson Company) | |
| AnSon Production Corporation | Chesapeake Merger II Corp. | |
| Antares Oil Corporation | Oxford Consolidated, Inc. | |
| Antelope Gas Products Company | Antelope Production Company | |
| Antelope Production Company | Same | |
| Antero Resources Corp. (Denver) | XTO Energy, Inc. | |
| Antlers Enterprises Inc. | Simba Energy Corp. | |
| Antonio Resources, Inc. | Petroro Corporation | |
| Anvil Petroleum Corp. | Same | |
| Apache Corporation (Houston) | Same | |
| Apache Exploration Corporation | Apexco, Inc. | |
| Apache Oil Corporation | Apache Corporation | |
| Apache Petroleum Co., LP | Key Production Company, Inc. | |
| Apache Petroleum Company | Apache Corporation | |
| Apache Petroleum Partnerships | Same (Affil: Apache Corporation) | |
| APC Operating Company | Same (Affil: Apache Corporation) | |
| APCO, Inc. | Allied Chemical Corporation | |
| APD Company | Same (Affil: Apache Corporation) | |
| Apex Oil Company Inc. | Same | |
| Apexco, Inc. | Natomas North America, Inc. | |
| APP Production Inc. | Same (Affil: Torch Energy Corporation) | |
| Appalachian Gas Sale Inc. | Eastern Energy Marketing Inc. | |
| APX Corporation | Same (Subsid: Anadarko Petroleum Corporation) | |
| APX Western Corporation | Anadarko Petroleum Corporation | |
| Aquataine | Elf Aquataine, Inc. | |
| Aquila Southwest Energy Corp. | Same (Subsid: Aquilla Energy Corp.) | |
| Aquila Southwest Marketing Corp. | Same (Subsid: Aquilla Energy Corp.) | |
| Aquila Southwest Pipeline Corp. | Same (Subsid: Aquilla Energy Corp.) | |
| Aquilla Energy Corp. | Same (Houston) (Subsid: UtiliCorp United) | |
| Arakis Energy Corp. | Talisman Energy, Inc. | |
| Arapaho Energy, Inc. | Subsid: Arapaho Petroleum, Inc. | |
| Arapaho Land Company, LLC | Same (Affil: JMA Energy Company, LLC) | |
| Arapaho Marketing Services, L.L.C. | Same (Subsid: Brighton Energy, L.L.C.) | |
| Arapaho Petroleum, Inc. | Intoil, Inc. | |
| Arapaho Ventures of New York, Inc. | Subsid: Arapaho Petroleum, Inc. | |
| Arapaho Ventures, Inc. | Subsid: Arapaho Petroleum, Inc. | |
| Arbuckle Oil Corporation | Same | |
| Arch Mineral Corp. | Ashland Oil & Refining Company | |
| Arch Petroleum Corp. | Pogo Producing Company | |
| ARCO | BP | |
| ARCO Exploration Company | Vastar Resources, Inc. | |
| ARCO International Oil and Gas Co. | Subsid: Atlantic Richfield Co. | |
| ARCO Oil and Gas Corp. | Vastar Resources, Inc. | |
| ARCO Petroleum Products Company | Subsid: Atlantic Richfield Co. | |
| Arena Resources Inc. | Sandridge Energy, Inc.(Pending 2010) | |
| Argas Inc. | Capital Energy Inc. | |
| Argent Energy, Inc. | Sonat Exploration Company | |
| Argo Oil Corporation | Atlantic Refining Company | |
| Argo Petroleum Corp. | Chevron USA, Inc. | |
| Argo Royalty Company | Argo Oil Corporation | |
| Argosy Energy Inc. | Garnet Resources | |
| Arguello Inc. | Same (Subsid: Plains Resources, Inc.) | |
| Ariel Company | Jerry Chambers Exploration Co. | |
| Arkansas Bellwether Inc. | Same (Affil: Torch Energy Corporation) | |
| Arkansas Fuel Corporation | Cities Service Oil & Gas Corp. | |
| Arkansas Louisiana Gas Company | ARKLA, Inc. | |
| Arkansas Louisiana Pipeline Company | ARKLA, Inc. | |
| Arkansas Natural Gas Company | Arkansas Natural Gas Corporation | |
| Arkansas Natural Gas Corporation | ARKLA, Inc. | |
| Arkla Energy Resources Company | Same | |
| ARKLA Exploration Company (E & P) | Seagull Energy Corporation | |
| ARKLA Rio Offshore Exploration Company | ARKLA Exploration Company | |
| ARKLA, Inc. (Gas Transmission) | NorAm Energy Corp. | |
| Arkoma Production Company | ARKLA Exploration Company | |
| Arlington Ventures Ltd. | Same | |
| Artex Exploration Company | ARKLA Exploration Company | |
| Articles of Inc. Capital Company | Transamerica Development Co. | |
| Asala Energy | Regional Independent | |
| Ascent Energy Inc. | Same (Subsid: RAM Energy Resources Inc. – Tulsa) | |
| Ascent Energy Louisiana, LLC | Same (Subsid: Ascent Energy Inc.) | |
| Ascent Operating, LP | Same (Subsid: Ascent Energy Inc.) | |
| Ascent Resources WV, Inc. | Same (Subsid: Ascent Energy Inc.) | |
| Ashland Exploration Holdings, Inc. | Same | |
| Ashland Exploration, Inc. | Subsid: Ashland Oil, Inc. | |
| Ashland Inc. | Ashland Exploration Holdings, Inc. | |
| Ashland Oil & Refining Company | Ashland Oil, Inc. | |
| Ashland Oil Canada | Kaiser Resources | |
| Ashland Oil Inc. | Ashland Inc. | |
| Aspen Group Resources Corp. | Same | |
| Associated Natural Gas, Inc. | Pan Energy Field Services, Inc. | |
| Associated Oil Company | Texaco USA, Inc. | |
| Associated Producers Company | Associated Oil Company | |
| Associated Royalty Company | Same | |
| Astra Resources, Inc. | Same (Subsid: Western Resources, Inc.) | |
| ATAPCO | Same | |
| Athabasca Company | Home Petroleum Corporation | |
| Athabasca Oil Sands | Suncor Energy Inc. | |
| Atlantic Oil Producing Company | Atlantic Refining Company | |
| Atlantic Petroleum Storage Co. | Atlantic Refining Company | |
| Atlantic Refining Co. | BP | |
| Atlantic Refining Company | Atlantic Richfield Company | |
| Atlantic Richfield Company | BP Amoco Inc. | |
| Atlantis Resources, Ltd. | Summit Resources, Ltd. | |
| ATP Oil & Gas Corp. | Same (Houston) | |
| Atra Exploration Corp. | Same | |
| Aurora Gasoline Company | Ohio Oil Company | |
| Austin Drilling Company | Southland Royalty Company | |
| Austral Oil Company | Mobil Oil Corporation | |
| Austral Oil Company, Incorporated | Same (Subsid: American Exploration Company) | |
| Avance Oil and Gas Company, Inc. | Amax Petroleum Corp. | |
| Aviara Energy Corp. (Houston) | Same (Affil: Hunt Petroleum Corp.) | |
| Axem Energy Co. | Same (Affil: Axem Resources Incorporated) | |
| Axem Resources Incorporated | Westport Oil & Gas Inc. | |
| Axio Natural Resources, Inc. | Chesapeake Energy Corporation | |
| Axroyalty, Inc. | Axem Resources Incorporated | |
| Axyn Petroleum Corp. | Drilcorp Energy Ltd. | |
| Aztec Energy Corp. | Same | |
| Aztec Oil and Gas Company | Same (Affil: Meridian Oil Inc.) | |
| B & B Drilling Company | Exxon Company USA | |
| B-L Associates | Same | |
| Babcock & Brown Energy Inc. | Same | |
| Babylon Oil Corp. | Same (Affil: Torch Energy Corporation) | |
| Baca Petroleum, Ltd. | Baca Resources, Ltd. | |
| Baca Resources, Ltd. | Same | |
| Baily, Vinson & Marion | Sinclair Oil Corporation | |
| Bakersfield Fuel and Oil Co. | Berry Petroleum Corporation | |
| Balco Energy Corp. | Houston Oil Fields Company | |
| Balcron Oil Company | Equitable Resources Energy Company | |
| Bald Eagle Energy Inc. | Same (Houston) | |
| Bald Eagle Energy Inc. (Houston) | Same | |
| Baldridge and King | Champlin Petroleum Company | |
| Ballard and Cordell | Balco Energy Corp. | |
| Bankline Oil Company | Aminoil USA, Inc. | |
| Banner Services, Inc. | Devon Energy Corporation | |
| Barago Energy Company | Mission Resources Corp. | |
| Barbour Energy Corporation | Same | |
| Barby Energy Corporation | Latigo Oil & Gas Inc. | |
| BarDon Oil Company | Liquidated | |
| Barfield Oil Corporation | Evergreen Operating Corporation | |
| Bargo Energy Company | Mission Resources Corporation | |
| Barnsdall Oil Company | Sunray Oil Corporation | |
| Barrett Energy Company | Barrett Resources Corporation | |
| Barrett Resources | Williams Companies | |
| Barrett Resources Corporation | Williams Companies, The | |
| Barrett, Bill Corporation | Same (Denver) | |
| Bartex Energy Corp. | Same | |
| Bartex Exploration Corp. | Same | |
| Baruch-Foster Corp. | Hadson Energy Resources Corp. | |
| BASF Corp. | Wintershall Energy | |
| Basin Drilling Corp. | Texaco, USA, Inc. | |
| Basin Exploration Inc. (Denver) | Stone Energy Corp. | |
| Basin Petroleum Company | Texaco USA, Inc. | |
| Basin Petroleum Corp. | Texaco USA, Inc. | |
| Basis Petroleum, Inc. | Same (Subsid: Salomon Inc.) | |
| Bass Bros. Enterprises, Inc. | Bass Enterprises Producing Co. | |
| Bass Enterprises Producing Co. | Same | |
| Bass Enterprises Production Co | Bass Brothers Enterprises Inc. | |
| Bay Petroleum & C.U. Bay | Tenneco Oil Company | |
| Bay Pipeline, Inc. | Conquest Exploration Company | |
| Bayard Drilling Technologies, Inc. | Same | |
| BayCorp. Holdings Ltd. | Same (Subsid: Sloan Group Ltd.) | |
| Baytrust Oil Explorations LTD | Same (Affil: Torch Energy Corporation) | |
| Bayview Petroleum Company | Mobil Oil Corporation | |
| BB & O Oil Company | Berry Petroleum Corporation | |
| BBM Drilling Company | Exxon Company USA | |
| BCF Resources, Inc. | Same | |
| Beacon Oil Company | Ultramar, Inc. | |
| Bear Energy, LP | Same(Subsid: Bear Stearns Companies, Inc.) | |
| Bear Stearns Companies, Inc., The | Same (NY, NY) | |
| Bearcat Land, Inc. | Same | |
| Beard & Hammond | Hammond, J.G. | |
| Beard Company, The | Beard Oil Company | |
| Beard Oil Company | Same | |
| Beardmore Oil, Inc. | Petroleum Company | |
| Beaver Creek Hydrocarbons, Inc. | Simba Energy Corp. | |
| Beaver Mesa Exploration Company | MGF Oil Corporation | |
| BEC Merger Corp. | The Beard Company | |
| Belcher Oil Company | Sabine Corp. | |
| Belco Development Corporation | BelNorth Petroleum Corporation | |
| Belco Oil & Gas Corp. | Westport Resources Corp. | |
| Belco Petroleum Corporation | BelNorth Petroleum Corporation | |
| Belco Petroleum North America, Inc. | Enron Oil & Gas Company | |
| Belco Wyoming Corporation | Enron Oil & Gas Company | |
| Beldon & Blake Corporation | Same | |
| Beldon & Blake Energy Company | Beldon & Blake Corporation | |
| Bell Oil & Gas Company | Vickers Refining Company, Inc. | |
| Bell Oil Company | Bell Oil & Gas Company | |
| Bell Petroleum Company | Sabine Corporation | |
| Bellexco Inc. | Same (Affil: Torch Energy Corporation) | |
| Bellwether Exploration Co. (Houston) | Mission Resources Corp. | |
| BelNorth Energy Company | Enron Oil & Gas Company | |
| BelNorth Energy Corporation | Enron Oil & Gas Company | |
| BelNorth Petroleum Corporation | BelNorth Energy Corporation | |
| Belridge Oil Company | Shell Oil Company, Inc. | |
| Ben Franklin Refining Company | Bell Oil and Gas Company | |
| Benedum-Trees Oil Company | Kerr-McGee North American Onshore Corporation | |
| Bennet Petroleum Corporation | Abraxus Petroleum Corporation | |
| Benton Oil & Gas Co. | Same | |
| Benz Energy Inc. | Same (Houston) | |
| Benz Oil Corporation | Benz Energy Inc. | |
| Berkley Petroleum Corporation | Anadarko Petroleum Corporation | |
| Berry & Ewig | Berry Petroleum Company | |
| Berry & Ewig Oil Company | Berry Petroleum Company | |
| Berry Holding Company | Berry Petroleum Company | |
| Berry Improvement Company | Berry Petroleum Company | |
| Berry Oil Company | Berry Petroleum Company | |
| Berry Oil Trading & Transpiration Company | Berry Petroleum Corporation | |
| Berry Petroleum | Linn Energy LLC | |
| Berry Petroleum Company | Berry Petroleum Corporation | |
| Berry Petroleum Corporation (Taft, CA) | Same | |
| Berry, C.J., Dredging Company | Berry Petroleum Company | |
| Beta Development Company | Mesa, Inc. | |
| Beta Oil & Gas Inc. | Same (Newport Beach, CA) | |
| Beta Oil & Gas Inc. (Houston) | Prtrohawk Energy Corporation | |
| BG Gas Services (US) | British Gas Exploration & Production Co. (Subsid: British Gas (PLC)) | |
| BG Group plc | Shell | |
| BHP Billiton Petroleum | BP | |
| BHP Petroleum (Americas) Inc. | Same | |
| BHP Petroleum Company Inc. | Same | |
| Big 10 Oil Company | Berry Petroleum Corporation | |
| Big A Well Service Company | Key Energy Group, Inc. | |
| Big Chief Drilling Company | Entex Petroleum, Inc. | |
| Big Four Petroleum Company | Same | |
| Big Horn Fractionation Company | Western Gas Processors, Ltd. | |
| Big Piney Oil & Gas Company | National Energy Group, Inc. | |
| Big Sky Marketing Corporation | Ocean Energy, Inc. | |
| Big West Drilling | Alliance Drilling Company | |
| Bintliff, D.C. | Same | |
| Birch Ranch Oil Company | Shell Oil Company, Inc. | |
| Bird Creek, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Bishop Oil Company | Shell Oil Company, Inc. | |
| Bison Energy Corporation | Middle Bay Oil Company, Inc. | |
| BJ Services Company | Same (Houston) | |
| Black Hills Exploration and Production, Inc. | Same (Rapid City, SD) | |
| Black Rock Partners LLC | Coronado Resources LLC | |
| Black Sea Energy, Inc. | Ivanhoe Energy, Inc. | |
| Black Stone Acquisitions Partner I, L.P. | Black Stone Natural Resources I, L.P. | |
| Black Stone Minerals Company, LP | Same (Houston) | |
| Black Stone Oil Company | Comstock Resources, Inc. | |
| Black Warrior Wireline Corp. | Warrior Energy Services Corporation | |
| Blackbeard Operating | Akin Beene Resources | |
| Blackbird Company | Same (Affil: Axem Resources Incorporated) | |
| Blackhawk Oil Company | Same (Affil: Torch Energy Corporation) | |
| Blackjack Resources, Inc. | Same | |
| Blanco Oil Company | Sohio Petroleum Company | |
| Blazer Energy Corp. | Eastern States Oil & Gas, Inc. | |
| Blessure Hydrocarbons Corp. | Same | |
| Blue Dolphin Energy Company | Same (Houston) | |
| Blue Dolphin Exploration Company | Same (Subsid: Blue Dolphin Energy Company) | |
| Blue Quail Oil Company | Silverridge Corp. | |
| BMR Corporation | HS Resources, Inc. | |
| BN Financial Services Inc. | Same (Affil: Meridian Oil Inc.) | |
| BN Geothermal Inc. | Same (Affil: Meridian Oil Inc.) | |
| BN Leasing Inc. | Same (Affil: Meridian Oil Inc.) | |
| BN Services, Inc. | Same (Affil: Meridian Oil Inc.) | |
| BNL Development Corp. | Same (Affil: Meridian Oil Inc.) | |
| Bodcaw Oil Properties | Placid Oil Company | |
| Boesche, Peter | Same | |
| Bogert Oil Company | Louis Dreyfus Energy Corp. | |
| Bogert, Richard D. | BOGO Energy Corporation (operated properties) | |
| BOGO Energy Corporation | Same | |
| Boise Southern Company, Inc. | Sonat Minerals, Inc. | |
| Boltex Oil & Gas Company | Same | |
| Bolyard Oil & Gas Ltd. | Camelot Corporation | |
| Bomac Exploration Company | W.R. Grace and Company | |
| Bonanza Petroleum, Inc. | Same | |
| Bonneville Fuels Corp. (Denver) | CEC Resources, Ltd. | |
| Bonneville Pacific Corp. | Same (Los Angeles) | |
| Bonray Drilling Corp. | Bayard Drilling Technologies, Inc. | |
| Bonray Energy Company | EOG (Oklahoma) Inc. | |
| Boomer Marketing Corp. | Same (Subsid: Alexander Energy Corporation) | |
| Border Exploration Company | Coastal Oil & Gas Corporation | |
| Border Resources Inc. | Lomak Energy Services Co. | |
| Boswell Corp. | Grace Petroleum Corporation | |
| Boswell Energy Corporation | Grace Petroleum Corporation | |
| Bosworth Oil Company | Same | |
| Boundary Oil Co. | Conquest Exploration Company | |
| Boundary Properties | Conquest Exploration Company | |
| Bow Valley Industries | Same | |
| Bow Valley Petroleum, Inc. | Great Western Resources, Inc. | |
| Box Energy Corporation | Remington Oil & Gas Corp. | |
| BP | British Petroleum Company | |
| BP Amoco Inc. | Same | |
| BP Canada | Talisman Energy, Inc. | |
| BP Exploration Inc. | BP Amoco, Inc. | |
| BP Exploration Inc. (lower 48 onshore) | TEX/CON Oil & Gas Company | |
| Bracell Petroleum | Murphy Oil Corporation | |
| Bracewell Development Corp. | Same (Affil: Torch Energy Corporation) | |
| Bracken Energy Company | Same | |
| Bradco Oil & Gas Company | Nichols Oil and Gas Company | |
| Bradford Corp. | Same | |
| Bradford Energy Corp. | Bradford Corp. | |
| Bradford Petroleum Co. | Bradford Energy Corp. | |
| Bradley Producing Corporation, The | Triton Producing Company | |
| Bradmar Petroleum Corporation | Alexander Energy Corporation | |
| Brandywine Oil | Atlantic Richfield Company | |
| Braun, C.F. | Satnta Fe Braun, Inc. | |
| Bravo Natural Resources Inc. (Tulsa) | Chesapeake Energy Corp. | |
| Brazos Oil and Gas Corp. | Same (Subsid: Dow Chemical) | |
| Breck Operating Corporation | Same | |
| BRG Petroleum Corporation | Chesapeake Energy Corp. | |
| BRG Petroleum Inc. | Seagull Energy Corp. | |
| BRG Production Company | BRG Petroleum Corporation | |
| BRI Holding Corp. | Chippewa Resources Corp. | |
| Bridge Oil Company | Parker and Parsley Development Partners, LP | |
| Bridgeline Holdings LP | Chevron | |
| Bridger Petroleum Corp. | Home Petroleum Corporation | |
| Brigham Exploration | Statoil (Equinor) | |
| Brigham Exploration Co. | Brigham Oil & Gas, L.P. | |
| Brigham Oil & Gas, L.P. | Same | |
| Brighton Acquisitions Company. L.L.C. | Same (Subsid: Brighton Energy L.L.C) | |
| Brighton Energy, L.L.C. | Same | |
| Brilliant Minerals Corporation | Womad Oil Company | |
| Brinson and Collines | United Producing Company | |
| Bristol Resources Corp. | Same (Tulsa) | |
| Bristol Resources Production Company | Same (Subsid: Bristol Resources Corp.) | |
| British American Oil Company | Gulf Oil Company | |
| British Gas (PLC) | Same | |
| British Petroleum | BP | |
| British Petroleum Company (US) | Sohio Petroleum Company | |
| British-Borneo Petroleum, Inc. | Same (Subsid: British-Borneo Petroleum Syndicate, PLC) | |
| Brock Exploration Corporation | Key Production Company, Inc. | |
| Broken Hill Proprietary Co. Ltd. | BHP Petroleum Company, Inc. | |
| Bronco Drilling Inc. | Same (Subsid: Allis-Chalmers Energy) | |
| Bronco Energy, Inc. | Same (Tuscon) | |
| Brookhave Oil Company | Lear Petroleum Corp. | |
| Brooklyn Union Gas | Fuel Resources | |
| Brooks Hall Oil Company | Alexander Energy Corp. | |
| Brown – Saratoga Corporation | Same | |
| Brown & Root | Halliburton Company | |
| Brown, The R.J. Company | Ashland Oil & Refining Company | |
| Brown, Tom Inc. (Midland) | Same (Subsid: EnCana Corp.) | |
| Brustan Petroleum Corp. | Same | |
| Buckeye Exploration | Keystone Exploration, Inc. | |
| Buckhorn Oil Company | Apache Corporation | |
| Buckhorn Petroleum | Harper Oil Company | |
| Buffalo Capital V Ltd. | Aladdin Oil Corp. | |
| Buffalo Oil Company | Conoco Inc. | |
| Burdell Properties | Mission Resource Partners, L.P. | |
| Burkhart Petroleum Corp. | Same (Houston) | |
| Burlington Northern Petroleum, Inc. | Same (Houston) | |
| Burlington Northern, Inc. | Same (Houston) | |
| Burlington Resources Corp. | ConocoPhillips | |
| Burlington Resources Inc. | ConocoPhillips | |
| Burlington Resources Offshore Inc. | ConocoPhillips | |
| Burlington Resources Trading Company | ConocoPhillips | |
| Burmah Oil and Gas Company | Aminoil USA, Inc. | |
| Burnaby Enterprises, Inc. | Unit Corporation | |
| Burnett Oil Company | Same | |
| Burns, R.L. | Pyro Energy Corp. | |
| Burton/Hawks, Inc. | Hawks Industries, Inc | |
| Bush Oil Company | Berry Petroleum Corporation | |
| Buttes Gas & Oil Company | Reunion Resources Company | |
| Buttonwood Petroleum Corporation | Gothic Energy Corporation | |
| Buttram Energies, Inc. | Same | |
| Buttran Texhoma Company | Buttran Energies, Inc. | |
| Byrd Oil Corp. | Mobil Oil Corporation | |
| Byrd Operating Co. | Same | |
| C & K Petroleum, Inc. | Enstar Petroleum Company | |
| C-Twentyette Oil and Gas Company (USA) | Tronz-Om US and Canada, Ltd. | |
| C.J. Company | Berry Petroleum Corporation | |
| Cabot Carbon Company | Cabot Corporation | |
| Cabot Corporation | Cabot Oil & Gas Corporation | |
| Cabot Oil & Gas | Coterra Energy | |
| Cabot Oil & Gas Corporation | Same | |
| Cachuma Drilling Corporation | Dyco Petroleum Corporation | |
| Caim Energy USA | Meridian Resource Corp. | |
| Cal Dive International Inc. | Same (Subsid: Helix Energy Solutions Group) | |
| Calco, Inc. | Chevron USA, Inc. | |
| California Company, The | Chevron USA, Inc. | |
| California Oil Company | California Company, The | |
| California Petroleum Corp. | Texaco USA, Inc. | |
| California Security Plans, Inc. | Burdell Properties | |
| Callon Consolidated Partners LP | Callon Petroleum Company | |
| Callon Petroleum | APA Corporation (Apache) | |
| Callon Petroleum Company | Same (Natchez, MS) | |
| Calpine Corp. | Same (Los Angeles, CA) | |
| Calplans Corporation | Burdell Properties | |
| Calplans Oil and Gas Company | Burdell Properties | |
| Calplans Partners | Burdell Properties | |
| Calplans Resources | Resource Partners | |
| Calumet Creek Oil, Ltd. | Atlantic Refining Company | |
| Calumet Florida, Inc. | Plains Resources, Inc. | |
| Calumet Industries, Inc. | Heritage Group, The | |
| Calvert Exploration Company | Sun Calvert Company | |
| Camaroo Energy Co. | C-Twentyette Oil and Gas Company (USA) | |
| Cambridge Atlantic Royalty Company | Ocean Energy, Inc. | |
| Cambridge Oil & Gas Company | Normandy Oil & Gas Co. | |
| Camelot Corporation | Same | |
| Cameriana Petroleum Corporation | Total Petroleum, Inc. | |
| Camterra Resources, Inc. | Same (Affil: Martex Drilling Company, LLP) | |
| Can West Exploration, Inc. | Same (Calgary) | |
| Canaan Energy Inc. | Chesapeake Energy Corp. | |
| Canaan Exploration, LLC | Same (Oklahoma City) | |
| Canadian Angus Resources, Ltd. | Abacan Resource Corp. | |
| Canadian Export Oil & Gas | Pacer Development | |
| Canadian Futurity Oils, Ltd. | Baca Resources, Ltd. | |
| Canadian Homestead Gas Company | Inter-City Gas | |
| Canadian Industrial Gas & Oil | Norcen Energy Resources | |
| Canadian Merrill | Francana Oil | |
| Canadian Reserve | Texaco USA, Inc. | |
| Canadian Superior Oil | Mobil Oil Corporation | |
| Canadian Turbo, Inc. | Same | |
| CanArgo Energy Corp. | Same (Houston) | |
| Canetic Resources Trust | Penn West Energy | |
| Canman (U.S.), Inc. | Amoco Production Company | |
| Cannon Energy, Inc. | Panther Energy Company, LLC | |
| Cannon Texas, Inc. | Cannon Energy, Inc. | |
| Canstar Ventures Corp. | Abacan Resource Corp. | |
| Cantera Natural Gas LLC | Copano Energy LLC | |
| Capatsky Petroleum, Inc. (Calgary) | Pease Oil Company | |
| Capco Energy Inc. | Same (Affil: Pyramid Petroleum. Inc.) | |
| Capital Energy Inc. | Same | |
| Capitalistic, Inc. | Fossil Bay Holding Co., Inc. | |
| Capitan Petroleum | E.E. Nearburg | |
| Capitan, Inc. | E.E. Nearburg | |
| Capoil Inc. | Montex Exploration Company | |
| Captiva Minerals Inc. | DLB Oil & Gas Inc. | |
| Captiva Resources, Inc. | Same | |
| Caravelle Petroleum, Inc. | Same | |
| Carbon Energy Corp. | Evergreen Resources, Inc. | |
| Cardinal Petroleum Company | Phillips Petroleum Company | |
| Carissa Oil Company | Berry Petroleum Corporation | |
| Carl Oil & Gas Co. | Same (Subsid: McFarland Energy, Inc.) | |
| Carlile and Howell, Inc. | Sonat, Inc. | |
| Carlton Resources Corp. | Ram Energy, Inc. | |
| Carmen Acquisition, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Carolina Oil & Gas | Graham Exploration Corp. | |
| Carper Drilling Company | Cities Service Oil Company | |
| Carrizo Oil & Gas | Callon Petroleum | |
| Carrizo Oil and Gas Inc. | Same | |
| Carson Petroleum Corporation | Devon Energy Corporation | |
| Cartel, Inc. | Same (Subsid: Washita Production Company) | |
| Carter Oil Company, The | Exxon Corporation | |
| Cascade & H.Y. “Red” Davidson | Pure Oil Company | |
| Cascade Natural Gas Corp. | MDU Resources Group Inc. | |
| Caspian Energy International Inc. (Dallas) | Puma Energy Inc. | |
| Castle Energy Corp. | Same (Subsid: Delta Petroleum Corp.) | |
| Castle Mud & Chemical Company | Matrix Energy, Inc. | |
| Castulon Royalty, Inc. | Roxana Resources, Ltd. | |
| Caveham Energy Resources Inc. | Same | |
| Cavenham Forest Industries Inc. | Caveham Energy Resources Inc. | |
| CCE Holdings LLC | Same (JV: Southern Union Company & GE Energy Financial Services) | |
| CDX LLC (Dallas) | TCW Group, Inc. | |
| CEC Resources, Ltd. | Same (Calgary) | |
| Cedyco Corporation (Houston) | Same | |
| Celeron Oil and Gas Company | Same | |
| Celsius Energy Company | Questar Exploration and Production Company | |
| CenAlta Energy Services Inc. | Same (Calgary) | |
| Cenard Oil & Gas Company | Chevron USA, Inc. | |
| Cenergy Exploration | Conquest Exploration Company | |
| Cenergy International | Conquest Exploration Company | |
| Cenergy Midwest Co. | Conquest Exploration Company | |
| Cenergy Transmission | Conquest Exploration Company | |
| Cenex, Inc. | Same | |
| Centennial Natural Gas Corporation | Grand Valley Gas Company | |
| Centennial Resource Development | Permian Resources | |
| Centex Oil and Gas, Inc. | Conquest Exploration Company | |
| Central Del Rio | Pan Canadian Petroleum | |
| Centura Energy | Minden Oil & Gas, Inc. | |
| Centura Inc. | Pennsylvania Castle Energy Corp. | |
| Centurion Corporation | Brown – Saratoga Corporation | |
| CEP Mid-Continent LLC | Same (Subsid: Constellation Energy Partners LLC) | |
| CH4 Corp. | Bill Barrett Corporation | |
| Chalaco, Ltd. | Jerry Chambers Exploration Co and Laser Oil Co. | |
| Chambers, Jerry Exploration Company | Same (Affil: Axem Resources Incorporated) | |
| Champion Reserve Corporation | Same | |
| Champlin Oil & Gas Corp. | Champlin Petroleum Company | |
| Champlin Oil & Refining Corp. | Champlin Petroleum Company | |
| Champlin Petroleum Company | Union Pacific Resources Company | |
| Champlin Refinery Company | Champlin Oil & Refining Corp. | |
| Chance Collar Co. | Same (Subsid: Homco International, Inc.) | |
| Chansler Western Oil & Development | Santa Fe Energy | |
| Chaparral Energy Inc. | Same (Oklahoma City) | |
| Chaparral Resources Inc. (New York) | Lukoil Overseas Holdings Inc. | |
| Chapman Energy, Inc. | Coda Energy, Inc. | |
| Chapman Resources Corp. | Chapman Energy, Inc. | |
| Charlestown Industries, Inc. | Same | |
| Charter E & P | Crystal Oil | |
| Charterhall America Inc. | Aviva America Inc. | |
| Chencere Petroleum Corp. | Adobe Resources Corporation | |
| Cherokee Resources, Inc. | Wynn-Crosby 1994, Ltd. | |
| Chesapeake Energy Corp. | Same | |
| Chesapeake Energy Marketing, Inc. | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake ENO Acquisition, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake Exploration Company | Chesapeake Exploration Limited Partnership | |
| Chesapeake Exploration Limited Partnership | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake Gas Development Corporation | Chesapeake Exploration Limited Partnership | |
| Chesapeake Gothic Corp. | Chesapeake Mid-Continent Corp. | |
| Chesapeake KNAN Acquisition, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake Louisiana, LP | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake Merger II Corp. | Chesapeake Mid-Continent Corp. | |
| Chesapeake Mid-Continent Corp. | Chesapeake Exploration Limited Partnership | |
| Chesapeake Operating, Inc. | Same (Subsid: Chesapeake Energy Corp.) | |
| Chesapeake ORC, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Chevron Corporation | Same (Houston) | |
| Chevron Texaco Corp. | Chevron Corporation | |
| Chevron USA, Inc. | Chevron Texaco Corp. | |
| Cheyenne Petroleum | Private Equity | |
| Chicago Corporation, The | Champlin Oil & Refining Corp. | |
| Chief Holdings LLC | Devon Energy Corporation | |
| Chieftain International, Inc. | Hunt Oil Company | |
| Chieftain Petroleum, Inc. | Entex Petroleum, Inc. | |
| Chinook Pipeline, Inc. | Nucorp Energy, Inc. | |
| Chinook Resources, Inc. | Nucorp Energy, Inc. | |
| Chippewa Resources Corp. | Same | |
| Chisholm Energy | Earthstone Energy | |
| CHK-Staghorn Acquisition LP | Same (Subsid: Chesapeake Energy Corp.) | |
| Choate, Jack H., Inc. | Ray Resources Corporation | |
| Christie, Mitchell & Mitchell | Mitchell Energy Corporation | |
| Chuska Resources Corp. | Same (Subsid: Harken Energy Corp.) | |
| CIGE Merger Company, LLC | El Paso Production | |
| Cimarex Energy | Coterra Energy | |
| Cimarex Energy Company | Same (Denver – Tulsa) | |
| Cimarron Gathering LLC | Copano Energy LLC | |
| Cimarron Operating Company | Same (Subsid: Lomak Petroleum, Inc.) | |
| Cimarrona Limited Liability Company | Same (Affil: the GHK Company) | |
| Cincinnati Gas and Electric Company | Cinergy Inc. | |
| Cinergy Corp | Cinergy Inc. | |
| Cinergy Inc. | Duke Energy Corp. | |
| Circle A Drilling, Inc. | Anschutz Corporation | |
| Cirque Energy Corp. | Tikal Resources Corp. | |
| Cirrus Production Company | Same (Enid, OK) | |
| CITCO | Cities Service Oil & Gas Corp. | |
| Citgo Petroleum Corp. | Subsid: Southland Corp. | |
| Cities Service Company | Cities Service Oil & Gas Corp. | |
| Cities Service Company (Citgo upstream) | Occidental Petroleum | |
| Cities Service Gas Company | Cities Service Oil & Gas Corp. | |
| Cities Service Oil & Gas Corp. | OXY USA Inc. | |
| Cities Service Oil Company | Cities Service Oil & Gas Corp. | |
| Cities Service Petroleum Company | Cities Service Oil Company | |
| Cities Service Pipeline Company | Southland Corporation | |
| Cities Service Refining Corp. | Cities Service Oil Company | |
| Cities Services Oil Company | Cities Service Production Company | |
| Citrus County Land Bureau, Inc. | Subsid: Weco Development Corp. | |
| Civitas Resources | SM Energy | |
| Clajon Gas Co., L.P. | Aquila Southwest Pipeline Corp. | |
| Clajon Holdings, L.P. | Aquila Southwest Energy Corp. | |
| Clajon Marketing, L.P. | Aquila Southwest Marketing Corp. | |
| Clark Oil & Refining Company | Apex Oil Company | |
| Clarkland Royalty, Inc. | Same (Affil: Meridian Oil Inc.) | |
| Clarkland, Inc. | Same (Affil: Meridian Oil Inc.) | |
| Classic Energy, Inc. | Same (Subsid: Chesapeake Energy Corp.) | |
| Classic Petroleum Resources | Same (Subsid: Chesapeake Energy Corp.) | |
| Clayoquot Resources, Ltd. (Calgary) | Same | |
| Clayton Williams Energy | Chevron | |
| Cleary Exploration, Inc. | Same | |
| Cleary Petroleum Corporation | Grace Petroleum Corporation | |
| Cleary Petroleum, Inc. | Cleary Production, Inc. | |
| Cleary Production, Inc. | Same | |
| Clements Energy, Inc. | NERCO Oil & Gas, Inc. | |
| Clements-Bloomer Resources | Clements Energy, Inc. | |
| Clinton Oil Company | Energy Reserves Group, Inc. | |
| Clipper Oil Company | Nutek Oil Inc. | |
| CLX Energy, Inc. | Same | |
| CLX Exploration, Inc. | CLX Energy, Inc. | |
| CMS Continental Natural Gas Inc. | CMS Field Services Inc. | |
| CMS Energy Corp. (Dearborn, MI) | Same (Subsid: Consumers Energy, Inc.) | |
| CMS Field Services Inc. | Same (Subsid: CMS Energy Corp.) | |
| CNG Corporation | CNG Producing Company | |
| CNG Producing Company | Dominion Exploration & Production, Inc. | |
| CNX Gas Company LLC | CONSOL Energy Holdings LLC | |
| CNX Gas Corporation | CONSOL Energy Holdings LLC | |
| Coastal Oil & Gas Corporation | El Paso Corp. | |
| Coastal Oils, Inc. | Same (Affil: Garrett & Co. – Oklahoma City) | |
| Coastal States Gas Company | Sabine Production Company | |
| Coastal States Gas Producing Company | Coastal Oil & Gas Corporation | |
| Cobb Oil & Gas Company | Same | |
| Cobb Resources Corporation | Golden Oil Company | |
| Cobopco, Inc. | Cobb Oil & Gas Company | |
| Cockrell Oil & Gas LP | UNOCAL Corporation | |
| Coconino SMA, Inc. (Park City, UT) | Same | |
| Coda Energy, Inc. | Same (Subsid: Belco Oil & Gas Corp.) | |
| Cody Company | Cabot Oil & Gas Corporation | |
| Cody Energy, L.L.C. | Cabot Oil & Gas Corporation | |
| CoEnergy Anadarko, Inc. | MCNIC Oil & Gas Midcontinent, Inc. | |
| CoEnergy Mid-Continent, Inc. | MCNIC Oil & Gas Midcontinent, Inc. | |
| CoEnergy Operating, Inc. | MCNIC Oil & Gas Midcontinent, Inc. | |
| Coho Resources, Inc. | Coho Resources, Ltd. | |
| Coho Resources, Ltd. | Same | |
| COI | Same (Subsid: Chesapeake Energy Corp.) | |
| Coldren Oil & Gas Company, LP | Same (New Orleans) | |
| Coldren Resources Company | Same (Subsid: Coldren Oil & Gas Company, LP) | |
| Colgate Energy | Centennial Resource Development | |
| Coline Gasoline Corporation | Santa Fe Energy Company | |
| Collins & Ware Inc. | Same (Midland) | |
| Colorado Interstate Gas Company | Coastal Oil & Gas Corporation | |
| Colorado Oil and Gas Corporation | Coastal Oil & Gas Corporation | |
| Colorado Oil and T and P | Same | |
| Colorado Oil Company | Coastal Oil & Gas Corporation | |
| Colt Intermodal Inc. | Same (Affil: Meridian Oil Inc.) | |
| Colt Resources, Inc. | Same (Subsid: JN Oil and Gas, Inc.) | |
| Columbia Carbon Company | Cities Service Oil & Gas Corp. | |
| Columbia Energy Co., L.P. | Same | |
| Columbia Energy Group | NiSource, Inc. | |
| Columbia Fuel Company | Cities Service Oil & Gas Corp. | |
| Columbia Gas Development Corp. | Aviara Energy Corp. | |
| Columbia Gas System, Inc. | Columbia Energy Group | |
| Columbia Natural Resources LLC | Chesapeake Energy Corp. | |
| Columbia Petroleum Corporation | Same | |
| Columbus Energy Corporation | Same (Subsid: Cimarex Energy Company) | |
| Comanche Energy Inc. | Same (Dallas) | |
| Comet Drilling Company | Ocean Energy, Inc. | |
| Comet Entertainment, Inc. | Texoil, Inc. | |
| Comex Marine Service | Same | |
| Common Parent Corporation | Same (Affil: Meridian Oil Inc.) | |
| Comstock Resources, Inc. | Same (Dallas) | |
| Concho Exploration Inc. | Chesapeake Energy Corp. | |
| Concho Oil & Gas Corp. | Chesapeake Energy Corp. | |
| Concho Resources Inc. | Chesapeake Energy Corp. | |
| Concise Oil and Gas Partnership | Same (Affil: Hallwood Energy Companies) | |
| Concord Oil Company | Same (Houston) | |
| Concur Petroleum | Guaranty Energy | |
| Conder | Same | |
| Conoco | ConocoPhillips | |
| Conoco Inc. | ConocoPhillips | |
| ConocoPhillips | Same (Houston) | |
| Conquest Energy Co. | American Exploration Company | |
| Conquest Exploration Company | American Exploration Company | |
| Conquest Texas, Inc. | Conquest Exploration Company | |
| Conquest Transmission Company | Boundary Properties, Inc. | |
| Consolidated Fuel Corporation | Exploration Company of Louisiana | |
| Consolidated Gas Utilities Corporation | ARKLA, Inc. | |
| Consolidated National Gas | CNG Corporation | |
| Consolidated Oil & Gas, Inc. | Hugoton Energy Corporation | |
| Consolidated Oil Corporation | Sinclair Oil Corporation | |
| Consolidated Production | Petro-Lewis Corp. | |
| Constellation Energy Parners LLC | Same (Houston) | |
| Consumers Gas | Same | |
| Consumers Power Company | U.S. Energy Corp. | |
| Continental Natural Gas, Inc. | CMS Energy Corp. | |
| Continental Oil & Transportation Co. | ConocoPhillips | |
| Continental Oil Company | Conoco Inc. | |
| Continental Resources Corp. | Chapman Resources Corp. | |
| Continental Resources, Inc. | Same (Enid, OK) | |
| Continental Trend Resources Corp. | Continental Resources Inc. | |
| Contour Energy Company | Same (Houston) | |
| Converst Energy Partners, Ltd. | Convest Energy Corp. | |
| Convest Energy Corp. | Edisto Resources Corp. | |
| Copano Energy LLC | Same (Houston) | |
| Coquina Oil Corp. | Same (Subsid: American Nat’l Petroleum Co.) | |
| Coral Drilling | Same | |
| Coral Reserves Group | Canaan Energy Inc. | |
| Core Oil and Gas | Same | |
| Corker Resources Inc. | Same (Calgary) | |
| Cornell Oil Company | Same (See Notes in back) | |
| Cornet | Conder | |
| Coronado Corporation | AMOCO Production Company | |
| Coronado Resources LLC | Same (Tulsa) | |
| Corpus Christi Oil & Gas Company | PG&E Resources | |
| Cortez Oil & Gas Inc. (Dallas) | Encore Acquisition Co. | |
| Cosden Oil & Chemical Company | American Petrofina Co. of Texas | |
| Cosden Petroleum/Grace | American Petrofina Co. of Texas | |
| Coseka Resources Ltd. | North Canadian Oils Ltd. | |
| Costain Holdings Inc. | Same | |
| Costilla Energy Inc. | Same | |
| Costilla Energy LLC | Costilla Energy Inc. | |
| Costilla Petroleum Corporation | Costilla Energy Inc. | |
| Coterra Energy | Devon Energy | |
| Cotton Petroleum Corp. | Apache Corporation (Oxy) | |
| Cotton Valley Resources Corp. | Aspen Group Resources Corp. | |
| Coty | Lario Oil and Gas Company | |
| Courtaulds | Same | |
| Courtaulds North America Inc. | Same | |
| Cox & Cox | Edwin L. & Berry R. Cox | |
| Cox, Edwin L. and Berry R. | Same | |
| CP Resources Inc | Redwood Energy (USA) Ltd. | |
| CRA, Inc. | Terra Resources, Inc. | |
| Crabtree, F. Dale | Jan-Dal Petroleum | |
| Crawley Petroleum Corporation | Same | |
| Crescendo Resources, L.P. | BP Amoco Inc. | |
| Crescent Corporation | Kerr-McGee Corporation | |
| Crescent Oil & Gas Corp. (Colorado) | Monument Resources, Inc. | |
| Crescent Oil and Gas Corporation | Livingston Oil Company | |
| Crescent Petroleum, Inc. | Same (Oklahoma City) | |
| Creslenn Oil Company | Deminex U.S. Oil Corp. | |
| Crestmont Petroleum | Cities Service Oil & Gas Corp. | |
| Crestone Energy Corp. | Same (Subsid: Benton Oil & Gas Co.) | |
| Crestwood Equity Partners | Energy Transfer | |
| Crimson Exploration Inc. | Same | |
| Cross Timbers Oil Company | XTO Energy Inc. | |
| Crown Central Petroleum Corp. | Same (Subsid: Apex Oil Company Inc.) | |
| Crown Partners, LLC (Oklahoma City) | Same | |
| Crown Zellerbach Corp. | James River Corporation | |
| CrownRock Operating LP | Occidental Petroleum | |
| Crusader Energy Company | Encore Operating, LP | |
| Crystal Gas Storage Inc. (Shreveport) | El Paso Energy Inc. | |
| Crystal Oil Company | Diamond Oil Company | |
| CS Resources Ltd. | Same | |
| CSL Partners | Costilla Energy Inc. | |
| CSX Oil & Gas Corporation | Total Petroleum, Inc. | |
| Cudd Pressure Control Inc. | Same (Subsid: RPC Inc.) | |
| Cummins & Walker Oil Company, Inc. | Corpus Christi Oil & Gas Co. | |
| Cutlass Corporation | 201 Corporation | |
| CXY, Inc. | Same (Subsid: Canadian Occidental Petroleum, Ltd.) | |
| Cypher Energy Corporation | Alliance Exploration Corp. | |
| Cyprus Capital Corp. | Everest Energy Corp. | |
| Cyprus Minerals Company | Same | |
| Cytoprobe Corporation | Same | |
| Dabros Properties, Inc. | JN Exploration & Production | |
| Dalco Oil Company | Sabine Production Company | |
| Daleco Resources Corporation (L.A., CA) | Same | |
| Dalen Resources Oil & Gas Co. | Enserch Corp. | |
| Dallas Oil & Minerals, Inc. | Lomak Petroleum, Inc. | |
| Damson Oil Corporation | Same | |
| Danciger | Sinclair Oil Corporation | |
| Daugherty Resources Inc. | Same (Lexington, KY) | |
| Davidson Oil & Gas, Inc. | DLB Oil & Gas, Inc. | |
| Dawson Production Services, Inc. | Key Energy Group, Inc. | |
| Days Corporation | Echo, Inc. | |
| DCP Midstream, Inc. | Same (Subsid: Duke Energy Corp.) | |
| DDD Energy Inc. | Same (Subsid: Seitel Inc.) | |
| Dean Brothers Oil Company | Great Expectations | |
| Deep Gas Exploration, Inc. | RATEX Resources Incorporated | |
| Deep Rock Oil Corporation | Crescent Corporation | |
| DeepKo Lease & Royalty Co | Same | |
| DEI Enterprises, Inc. | Same | |
| DEKALB Agricultural Association | DEKALB Petroleum & DEPCO, Inc. | |
| DEKALB Energy Canada, Ltd. | Apache Corporation | |
| DEKALB Energy Company | Devon Energy Company | |
| DEKALB Petroleum & DEPCO, Inc. | DEKALB Energy Company | |
| Del Mar | Same | |
| Del Mar Production | Southland Royalty Company | |
| Delhi Gas Marketing, Inc. | Koch Midstream Gas Marketing Company | |
| Delhi Gas Pipeline Company | Koch Midstream Services Company | |
| Delhi Gas Venture, Inc. | Koch Industries, Inc. | |
| Delhi GasMark, Inc. | Koch Midsteram Gasmark Company | |
| Delhi-Taylor Oil Company | Tenneco Oil Company | |
| Delhi-Trading Incorporated | Koch Industries, Inc. | |
| Delta Drilling Company | Kerr-McGee North American Onshore Corporation | |
| Delta Petroleum Corp. | Same | |
| Delta Rigging and Tool Inc. | Same (Subsid: Austin Ventures-Austin, TX) | |
| Delta U.S. Corporation | Kerr-McGee North American Onshore Corporation | |
| Deltaus Corporation | Delta U.S. Corporation | |
| Deminex U.S. Oil Corp. | Southwest Royalties, Inc. | |
| Denbury Inc. | ExxonMobil | |
| Denbury Offshore, Inc. | Newfield Exploration Company | |
| Denbury Resources Inc. | Same (Dallas) | |
| Deneve | Same | |
| Denver Producing Company | Indian Royalty Company | |
| DEPCO, Inc. | DEKALB Energy Company | |
| Desana Corporation, The | Same (Subsid: Presidio Company) | |
| Desert American Agency, Inc. | Same (Affil: Meridian Oil Inc.) | |
| Desert Magic Inc. | Same (Affil: Meridian Oil Inc.) | |
| Detex Oil Corp. | Southwest Royalties, Inc. | |
| Deven Resources, Inc. | Same (Subsid: Daleco Resources Corporation) | |
| Devon Corporation | Devon Energy Corp. | |
| Devon Energy Corp. | Same (Oklahoma City) | |
| Devon Energy Management Company LLC | Devon Energy Production Company LP | |
| Devon Energy Operating Company LP | Devon Energy Producing Company LP | |
| Devon Louisiana Corporation | Devon Energy Production Company LP | |
| Devonian | Warren Petroleum Corp. | |
| DevX Energy Inc. | Comstock Resources, Inc. | |
| Diamond A Inc. | Coda Energy Inc. | |
| Diamond Alkali Company | Diamond Shamrock Exploration Co | |
| Diamond Energy Operating Co. | Coda Energy Inc. | |
| Diamond Energy, Inc. | Diamond Energy Operating Co. | |
| Diamond M Corporation | Same | |
| Diamond M Offshore Corp. | Diamond M Corporation | |
| Diamond Oil Company | Sun Oil Company | |
| Diamond Shamrock Corp. (E&P Operations) | Diamond Shamrock Exploration Co | |
| Diamond Shamrock Exploration Co. | Maxus Exploration Company | |
| Diamond Shamrock Offshore Partners LP | Meridian Oil Corp. | |
| Diamond Shamrock, Inc. | Ultramar Diamond Shamrock Corporation | |
| Diamond, Harry H. | Diamond Energy, Inc. | |
| Diamondback/Endeavor | Diamondback Energy | |
| Diatom Petroleum Inc. | Same (Bakersfield) (Subsid: Ivanhoe Energy, Inc.) | |
| Distinct Properties Energy, Inc. | Hare-Distinct Acquisition Corp. | |
| Diversa, Inc. | Homa Oil Company | |
| Diverse Energy Investments, Inc. | Same | |
| Diversfied Energies | Ocean Energy, Inc. | |
| Dixel | Blackjack Resources, Inc. | |
| Dixel Resources, Inc. | Owl Petroleum Company | |
| Dixie Oil Company | AMOCO Production Company | |
| DKM Resources, Inc. | Medallion Production Company | |
| DLB Energy, Inc. | DLB Oil & Gas, Inc. | |
| DLB Oil & Gas, Inc. | Chesapeake Mid-Continent Corp. | |
| DMF Resources Inc. | Same | |
| Dome Petroleum Corp. | Texaco USA, Inc. | |
| Dominion Exploration & Production, Inc. | Same (Subsid: Dominion Resources, Inc.) | |
| Dominion Oklahoma Texas Exploration & Production, Inc. | Linn Energy Inc. | |
| Dominion Resources, Inc. | Same | |
| Doran & Associates, Inc. | Cabot Corporation | |
| Dorchester | Damson Oil | |
| Dorfman Production | Heisler, W.H., Jr. | |
| Dos Ninos Oil & Gas Inc. | Simba Energy Corp. | |
| Double Eagle IV | Diamondback Energy | |
| Double Eagle Petroleum Co. (Casper, WY) | Same | |
| Double Eagle Petroleum Inc. | Comanche Energy Inc. | |
| Double H Petroleum Corp. | ALN Resources Corp. | |
| Dougherty, J.F., Company | Same | |
| Douglass Resources Corporation | Cleary Petroleum Corporation | |
| Dow Chemical Co., Inc. (Oil & Gas Div.) | Apache Corporation | |
| Drako Gas Partners, L.P. | Tide West Oil Company | |
| Dresser Industries, Inc. | Halliburton Company | |
| Dreyer Bros., Inc. | Same (Affil: Meridian Oil Inc.) | |
| Dreyfus, Louis, Natural Gas Corp. | Dominion Exploration and Production, Inc. | |
| Drilcorp Energy Ltd. | Same | |
| Drilley Co. | Atlantic Richfield Company | |
| Drilling and Exploratin | Sinclair Oil Corporation | |
| DRJ, Inc. | Ocean Energy, Inc. | |
| DSM Exploration, Inc. | Gulf Production Corp. | |
| Duer Wagner & Co. | Wagner Oil Company | |
| Duke Energy Corp. | Same | |
| Duke Energy Field Services | DCP Midstream, Inc. (Subsid: Duke Energy Corp) | |
| Duke Energy Field Services, Inc. | Duke Energy Field Services, LP | |
| Duke Energy Field Services, LP | Same | |
| Duke Power Company | Duke Energy Corp. | |
| Duncan Corp. | Cobb Oil & Gas Company | |
| Duncan Energy Company | Babcock & Brown Energy, Inc. | |
| Duncan Enterprises, Inc. | DEI Enterprises, Inc. | |
| Duncan, J. Walter Corp. | Same | |
| Dupre’ International Inc. | National-Oilwell Inc. | |
| Dupre’ Supply Company | National-Oilwell Inc. | |
| Durango Midstream | Kinetik | |
| Dusty Mac Resources, Inc. | TransGlobe Oil & Gas Corp. | |
| Dyco Petroleum Corporation | Same (Subsid: Samson Investment Company) | |
| Dynamar Energy, Inc. | Devon Energy Corporation | |
| Dyne Exploration Company | Same (Subsid: Ascent Energy Inc.) | |
| Dynegy Inc. | Same (Houston) | |
| E.P. Operating | Subsid: Enserch Corp. | |
| Eagle Chief Royalty Company | Faulkner Corp. | |
| Eagle Mountain Energy Corp. | Clinton Oil Company | |
| EAI Acquisition Company Inc. | Same (Affil: Torch Energy Corporation) | |
| Earlsboro Energies | Same (Subsid: Bogert Oil Co.) | |
| Earlsboro Energies Corp. | Earlsboro Energies | |
| Earlsboro Energy Corporation | Same | |
| Earlsboro Oil and Gas Corp. | Earlsboro Energies | |
| Earthstone Energy | Permian Resources | |
| Eason Oil Company | Sonat, Inc. | |
| East Tennessee Natural Gas | Tenneco Oil Company | |
| East Wall Street Corporation | Socony Mobil Oil Company, Inc. | |
| Eastern Energy Marketing Inc. | Same (Subsid: The Eastern Group, Inc.) | |
| Eastern Group, Inc., The | Same (Subsid: Statoil, Inc.) | |
| Eastern States Exploration Company | Equitable Resources Energy Company | |
| Eastern States Oil & Gas, Inc. | Equitable Resources Energy Company | |
| Eastern States Oil Company | Signal Company | |
| Eastern States Petroleum & Chemical Co. | Eastern States Oil Company | |
| Eastland Oil Company | Sinclair Oil Corporation | |
| Eberly and Meade, Inc. | Meade Energy Corporation | |
| ECC Energy Corp. | West America Corp. | |
| Echo, Inc. | Same | |
| Ecological Engineering Systems, Inc. | Western Gas Processors, Ltd. | |
| ECOS Corporation | Same (Affil: Meridian Oil Inc.) | |
| Ecova Corporation | Amoco Production Company | |
| Ecuanor ASA | Rocksource ASA | |
| Edge Petroleum Corp. | Same | |
| Edisto Resources Corp. | Forcenergy, Inc. | |
| Edwards & Leach Oil Company | Alexander Energy Corporation | |
| EEH Newco LLC | Encana Corp. . | |
| EEX Corp. | Same | |
| EEX Onshore, Inc. | Same (Subsid: EEX Corp.) | |
| EFA Technologies, Inc. | Same | |
| Egret Energy Corporation | Same | |
| El Can Petroleum Company | Same (Affil: Meridian Oil Inc.) | |
| El Dorado Oil Company | Berry Petroleum Corporation | |
| El Paso Corp. | Same (Houston) | |
| El Paso Energy, Inc. | El Paso Corp. | |
| El Paso Exploration and Production Company | Same (Subsid: El Paso Natural Gas Co.) | |
| El Paso Exploration Company | Meridian Oil Inc. | |
| El Paso Natural Gas Company | Same (Houston) | |
| El Paso Oil & Gas Acquisition Corp. | Same (Subsid: El Paso Corp.) | |
| El Paso Production Company | Same (Subsid: El Paso Corp.) | |
| El Paso Products Company | Subsid: El Paso Natural Gas Co. | |
| Elan Energy, Ltd. | Same | |
| Eland Energy Corporation | Same | |
| Elba Gas Company | WOC Acquisition Company | |
| Elders Resources North America Inc. | New London Resources, Inc. | |
| Elf Aquitaine Inc. | Elf Exploration, Inc. | |
| Elf Exploration, Inc. | Same | |
| Elk River Resources | Sun Company, Inc. | |
| Ellora Energy | ExxonMobil | |
| Ellora Oil & Gas Inc. | Same (Boulder) | |
| Ellora Operating LP | Same (Affil: Ellora Oil & Gas Inc.) | |
| Ellwood Oil Company | Southwest Royalties Inc. | |
| Elmerado Petrocorp | JAN-DI Corp. | |
| EM Nominee Partnership Company | Same (Affil: Hallwood Energy Companies) | |
| Emerald Oil and Gas | Out of Business – Liquidated | |
| Empire Energy Company | Amoco Production Company | |
| Empire Gas and Fuel Company | Empire Oil and Refining Company | |
| Empire Oil and Refining Company | Cities Service Oil & Gas Corp. | |
| Empire Southern | Andrews Production Company | |
| Enable Midstream Partners | Energy Transfer | |
| EnCana Corp. | Same | |
| EnCana Corporation | Ovintiv Inc. | |
| EnCana Oil & Gas, Ltd. | EnCana Corp. | |
| Encino Acquisition | EOG Resources | |
| Encor Inc. | Talisman Energy Inc. | |
| Encore Acquisition Company | Same (Ft. Worth) | |
| Encore Operating LP | Same (Ft. Worth) | |
| Endeavor Energy Resources | Diamondback Energy | |
| Endeavor Pipeline Inc. | Same (Subsid: GMX Resources Inc.) | |
| Energen Corporation | Diamondback Energy | |
| Energen Resources Corporation | Same | |
| Energen Resources MAQ, Inc. | Energen Resources Corporation | |
| Energy Assets Capital Corp. | Same (Affil: Torch Energy Corporation) | |
| Energy Assets International Corp. | Same (Affil: Torch Energy Corporation) | |
| Energy Assets IV-A LTD | Same (Affil: Torch Energy Corporation) | |
| Energy Associates, Inc. | General Atlantic Energy Corporation | |
| Energy Development Corporation | Same (Subsid: Samedan Oil Corp.) | |
| Energy Exchange Corp. | French Petroleum Corporation | |
| Energy Investments Inc. | Same | |
| Energy Minerals Corp. | HS Resources, Inc. | |
| Energy Operations Nevada, LP | Same | |
| Energy Partners LTD (a/k/a EPL) | Same (New Orleans) | |
| Energy Partners Nominee Co. | Duncan Energy Company | |
| Energy Reserves Group, Inc. | BHP Petroleum (Americas) Inc. | |
| Energy Service Company, Inc. | ESCO, Inc. | |
| Enerplus Group | Same | |
| Enex Resources Corp. | Same (Subsid: Midland Resources, Inc.) | |
| English-American Import Export Co. | Same (Affil: The GHK Company) | |
| Enhance Oil Resources, Inc. | Same (Houston) | |
| Enjay Chemical Company | Exxon Corporation | |
| Enogex, Inc. | Same (Subsid: Oklahoma Gas & Elec. Company) | |
| Enopco Inc. | UMC Petroleum Corporation | |
| Enova Corporation | Sempra Energy, Inc. | |
| Enpal Inc. | UMC Petroleum Corporation | |
| ENRON Corp. | Same | |
| Enron Gas Service Corp | Same (Subsid: ENRON Corp.) | |
| Enron Oil & Gas Company | EOG Resources, Inc. | |
| ENRON OIL AND GAS COMPANY | EOG Resources Inc. | |
| Ensearch/Evergreen | TXU/Pioneer | |
| Enserch Corp. | EEX Corp. | |
| Enserch Exploration | Enserch Corp. | |
| Ensign Oil & Gas Inc. | Same | |
| Ensign Oil Company | Devon Energy Corporation | |
| Ensource Inc. | UMC Petroleum Corporation | |
| Ensources Inc. | UMC Petroleum Corporation | |
| Enstar Petroleum Company | Union Texas Petroleum Corp. | |
| Enstar Petroleum, Inc. | Enstar Petroleum Company | |
| Ensyn Energy Inc. | Ivanhoe Energy, Inc. | |
| Ensyn Group Inc. (Boston) | Ivanhoe Energy, Inc. | |
| Ensyn Petroleum International | Ivanhoe Energy, Inc. | |
| Entell NGL Services, LLC | Same (50/50 JV of Tejas Natural Gas Liquids LLC and Enterprise Products Partners, L.P.) | |
| Enterprise Oil plc | Shell | |
| Enterprise Products Partners, L.P. | Same (Houston) | |
| Entex Petroleum, Inc. | UMC Petroleum Corporation | |
| Entex, Inc. | Same (Affil: Arkla Energy Resources Company) | |
| EOG (Oklahoma) Inc. | Same (Subsid: Ensign Oil Gas Inc.) | |
| EOG Resources, Inc. | Same (Houston) | |
| EOR International Inc. | Uentech International Corp. | |
| EPCO | Same | |
| EPL | Same (See Energy Partners, Ltd) | |
| Eppi Energies Corp. | Same (Subsid: Gibson US Corp.) | |
| EPSCO | Flow-Quip Texas Inc. | |
| EPX Company | Same (Affil: Meridian Oil Inc.) | |
| Equitable Petroleum Corp. | Equitable Resources Energy Company | |
| Equitable Production (Gulf) Company | Westport Resources Corp. | |
| Equitable Resources Energy Company | Same (Pittsburgh) | |
| Equity Oil Company (Salt Lake) | Whiting Petroleum Corp. | |
| ESCO Energy Inc. | Edisto Resources Corp. | |
| ESCO, Inc. | Edisto Resources Corp. | |
| Esenjay Exploration Inc. (Houston) | Santos USA Corp. | |
| Esmeralda Limited Liability Company | Same (Affil: The GHK Company) | |
| Esso | ExxonMobil | |
| Esso Chemical Company, Inc. | Exxon Corporation | |
| Esso Standard Oil Company | Humble Oil and Refining Co. | |
| Estoril Producing Corporation | Same | |
| Ethel D. Company | Berry Petroleum Corporation | |
| Eureka Oil Company | Same | |
| Everest Energy Corp. | Same (Calgary) | |
| Evergreen Resources, Inc. | Same (Denver) (Subsid: Pioneer Natural Resources, Inc.) | |
| Ex-Mission Ranches, Inc. | Same (Affil: Meridian Oil Inc.) | |
| Excel Energy Corp. | Barrett Resources Corporation | |
| Excel Oil & Gas, Inc. | National Energy Group | |
| Excelsior Oil Corp. | McMoran Oil & Gas Company | |
| Exchange | Transco | |
| Exco Resources, Inc. | Same (Dallas) | |
| Exeter Oil Company | Apache Corporation | |
| Expedition Natural Resources Inc. | Same (Subsid: GMX Resources Inc.) | |
| Exploration Associates, L.P. | Exploration Associates, LLC | |
| Exploration Associates, LLC | Same (Oklahoma City) | |
| Exploration Company | TXCO Resources, Inc. | |
| Exploration Company of Louisiana (XCL) | XCL, Ltd. | |
| Exploration Company, The (San Antonio) | TXCO Resources, Inc. | |
| Exploration Drilling, L.P. | Exploration Associates, LLC | |
| Exploration, Inc. | Presidio Exploration, Inc. | |
| Express Acquisition Company | Same (Affil: Torch Energy Corporation) | |
| Exxon | ExxonMobil | |
| Exxon Company USA | ExxonMobil Corp. | |
| Exxon Corporation | Exxon Company USA | |
| ExxonMobil Corp. | Same (Houston) | |
| F & M Oil Company | Same | |
| F & P | McMoran Oil and Gas Company | |
| Fain Porter Production Company | Same (Affil: The GHK Company) | |
| Fairbanks and Haas Inc. | Fortune Petroleum Corp. | |
| Falcon Seaboard | Diamond Shamrock Exploration Co | |
| Fargo Oils LTD. | Getty Oil Company | |
| Farmer, Ed & Associates, Inc. | EFA Technologies, Inc. | |
| Farmers Union Central Exchange, Inc. | Cenex, Inc. | |
| Farmland Industries, Inc. | Oxoco, Inc. | |
| Farmland International Energy Co. | Terra Resources, Inc. | |
| Faulconer, Vernon E. Inc. | Same | |
| Faulkner Corp. | Same | |
| Faulkner Exploration, Inc. | Faulkner Corp. | |
| FEC Offshore Inventory Company | Enron Oil & Gas Company | |
| Federal Intermediate Credit Bank | Farm Credit Bank of Wichita | |
| Federal Land Bank of Wichita | Farm Credit Bank of Wichita | |
| Federated Natural Resources Corp. | Cherokee Resources, Inc. | |
| Felmont Oil & Gas Company | Same (Affil: Torch Energy Corporation) | |
| Felmont Oil Corporation | Tenneco Oil Company | |
| Ferguson and Bosworth | Dissolved (See Notes in back) | |
| Ferguson Oil and Gas Company | Dome Petroleum Corp. | |
| Ferguson Oil Company | Same | |
| Fidelity Capital Corporation | Petrodynamics, Inc. | |
| Fidelity Royalty Company | Toklan Oil Company | |
| Fifteen Oil Company | Tenneco Oil Company | |
| Fina Inc. | Same | |
| Fina Oil and Chemical Company | Same (Subsid: Fina Inc.) | |
| Finlay Energy Corp. | Same | |
| FireBird Energy | Diamondback Energy | |
| First Energy Corp. | Same (Akron, Ohio) | |
| Five States Energy Company LLC | SM Energy | |
| Flag Oil Corp. | Flag-Redfern Oil Corp. | |
| Flag-Redfern Oil Corp. | Kerr-McGee North American Onshore Corporation | |
| Flores & Rucks, Inc. | Ocean Energy, Inc. | |
| Florida Exploration Company | HNG Oil Company | |
| Florida Gas Exploration Company | Florida Exploration Company | |
| Flow-Quip | Flow-Quip Texas | |
| Flow-Quip Texas Inc. | Same | |
| Fluor Minerals, Inc. | Fluor Oil and Gas Corporation | |
| Fluor Oil and Gas Corporation | Primary Fuels | |
| Flying Diamond Oil Corp. | Bow Valley Industries | |
| Flynn Energy Corp. | RVO Petroleum Co. | |
| FM Properties Operating, Inc. | Samedan Oil Corporation | |
| FM Properties, Inc. | Same | |
| Focus Energy USA Inc. | Energy Operations Nevada, LP | |
| Fonsagrada, S.A. | Same (Affil: The GHK Company) | |
| Foran Oil Company | Matador Petroleum Corporation | |
| Forcenergy, Inc. | Forest Oil Corporation | |
| Forchall Oil | Same | |
| Forest Energy Resources (Subsid: Forest Oil) | Mariner Energy, Inc. | |
| Forest Oil Company | Forest Oil Corporation | |
| Forest Oil Corporation | Same | |
| Fort Collins Consolidated Royalties, Inc. | Encana Corp. | |
| Fortuna Energy Corp. | Midwest Energy Corp. | |
| Fortune Natural Resources Corp. | Same | |
| Fortune Petroleum Corp. | Fortune Natural Resources Corp. | |
| Fossil Bay Holding Co., Inc. | Same | |
| Founders Energy, Ltd. | Same | |
| Fowler Farm Oil Corporation | Western Crude Oil, Inc. | |
| Fox Production Corporation | Zuma New-Mexico Oil Corporation | |
| FP, Inc. | Lomak Petroleum, Inc. | |
| Francana Oil | Same | |
| Franco Western | Franco Wyoming Oil Company | |
| Franco Wyoming Company | Southland Royalty Company | |
| Frankfort | Texas Pacific Oil Company | |
| Fred Olsen, Inc. | Volvo Petroleum | |
| Freeport McMoRan Oil and Gas Company | Freeport McMoRan Acquisition Company | |
| Freeport Oil Company | McMoran-Freeport Oil Company | |
| Freeport-McMoran Inc. | McMoran Oil & Gas Company | |
| Fremont Energy Corporation | Amerac Energy Corporation | |
| French Petroleum Corp. | Red Eagle Resources Corp. | |
| French Production Inc. | Same | |
| Frontier Oil & Gas Co., Inc. | Same (Subsid: Wainoco Oil Corp.) | |
| FT-79 Corp. | Eppi Energies Corp. | |
| Fuel Resources | Same | |
| Fuhrman Petroleum Corporation | Conoco Inc. | |
| Fullerton Oil Company | Monterey Oil Company | |
| Funk Exploration | Waterford Energy, Inc. | |
| G.L.M. Oil and Gas Company (Wyoming) | Same | |
| GAE Corp. | Ocean Energy, Inc. | |
| Galena-Signal Oil Company | Texaco USA, Inc. | |
| Gallant Oil Company | Same | |
| Galvest, Inc. | PrimeEnergy Corporation | |
| Garnet Resources | Same | |
| Garrett & Co. (Oklahoma City) | Same | |
| Gas Producing Enterprises, Inc. | Coastal Oil & Gas Corporation | |
| Gas SpinCo, Inc | DCP Midstream, Inc. | |
| Gasamerica, Inc. | Same (Affil: The GHK Company) | |
| Gasart, Ltd. | Same (Affil: The GHK Company) | |
| Gasoklahoma, Inc. | Same (Affil: The GHK Company) | |
| GBK Corporation (George B. Kaiser) | Same (Affil: Kaiser-Francis Oil Company) | |
| GCO Minerals Company | Same (Subsid: International Paper Company) | |
| GED Energy Services, Inc. | KSC Energy, Inc. | |
| Gem Oil, Inc. | Same (Subsid: American Exploration Company) | |
| Gemco, Inc. | Chevron USA, Inc. | |
| Gen. American Oil Company of Texas | Phillips Petroleum Company | |
| General American Oil Co. of Texas | ConocoPhillips | |
| General American Oil Company | Phillips Petroleum Company | |
| General Atlantic Energy Corporation | General Atlantic Rockies Production Co. | |
| General Atlantic Oils, Ltd. | Ocean Energy, Inc. | |
| General Atlantic Resources, Inc. | Ocean Energy, Inc. | |
| General Atlantic Rockies Production Co. | Ocean Energy, Inc. | |
| General Crude Oil Company | Mobil G.C., Inc. | |
| General Development Partnerships (various) | UMC Petroleum Corporation | |
| General LP Acquisition Inc. | UMC Petroleum Corporation | |
| General Petroleum Corp. | Mobil Oil Corporation | |
| General Producing Company | UMC Petroleum Corporation | |
| Geodyne Energy Inc. | Same (Calgary) | |
| Geodyne Resources, Inc. | Samson Investment Company | |
| Geodyne Technologies Inc. | Geodyne Energy Inc. | |
| Georgetown Exploration Inc. | Same | |
| Getty Oil Company | Texaco USA, Inc. | |
| Getty Petroleum Marketing | Same (Subsid: Lukoil Oil Company) | |
| Getty Reserve Oil, Inc. | Getty Oil Company | |
| GFI Oil & Gas Corporation (Houston) | Salamander EnergyPLC (London) | |
| GHK Capital Company | Same (Affil: The GHK Company) | |
| GHK Company (Non-Operated/Producing Prop.) | GHK Energy Corp. | |
| GHK Company (Operated Properties) | Transitory Corporation | |
| GHK Company Columbia | Same (Affil: The GHK Company) | |
| GHK Company, The | Same (Note: New Entity) | |
| GHK Corporation, The | Same (Affil: The GHK Company) | |
| GHK Energy Corp. | GHK Company, The | |
| GHR Energy, Inc. | Same | |
| Giant Exploration & Production Company | Same | |
| Giant Refining Company, Inc. | Same | |
| Gibralter Exploration Company | High Point Investments | |
| Gibson US Corp. | Same | |
| Gilcrease Oil Company | Venus Oil Company | |
| Gilliland Oil Company | Reserve Petroleum Company | |
| GKM Oil Company | GKM, Inc. | |
| GKM, Inc. | Petromark Merger Company | |
| Glacier Arizona Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Boulder Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Denver Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Gateway Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Kent Industrial Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park King Street Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Liquidating Company | Meridian Oil Inc. | |
| Glacier Park Naperville Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Northwest | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Orillia Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Riverpoint Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park South Lander Company | Same (Affil: Meridian Oil Inc.) | |
| Glacier Park Wayzata Company | Same (Affil: Meridian Oil Inc.) | |
| Glasscock/Homa | Diversa/Plantation | |
| Glencoe Resources Ltd. | Same | |
| Global Exploration, Inc. | Same | |
| Global Exploration, L.L.C. | Global Exploration, Inc. | |
| Global Link Technologies, Inc. | JR Oil & Gas, Inc. | |
| Global Natural Resources | Devon Energy | |
| Global Natural Resources Corporation | Seagull Energy Corporation | |
| GlobalSantaFe Corp. | Transocean, Inc. | |
| Globe | Lario Oil and Gas Company | |
| Globe Life & Acc. Ins. Company (O&G Assets) | Same (Affil: Torch Energy Corporation) | |
| Glorieta Oil Company Inc. | Devon Energy Corporation | |
| Glover Hefner Kennedy Company | GHK Company, The | |
| GMX Resources Inc. | Same | |
| Goane Exploration California Corp. | Same | |
| Goane-Gitzch (US), Ltd. | Goane Exploration California Corp. | |
| Goddard Investment Company | Same | |
| Goddard, C.B., Investment Company | Goddard Investment Company | |
| Goff Oil Company | Reading & Bates Production Co. | |
| Goff-Lepper Drilling Company | Goff Oil Company | |
| Gold Deposit Mining & Milling Co. (Utah) | Onasco Companies, Inc. (Utah / Tennessee) | |
| Gold King Exploration | Denovo | |
| Golden Eagle Energy Inc. | Ultramar | |
| Golden Exploration & Production Corp. | Same (Subsid: Arlington Ventures Ltd.) | |
| Golden Oil Company | Same | |
| Golden Triangle Royalty & Oil, Inc. | Same | |
| Goodrich Petroleum, Inc. | Same | |
| Gopher Oil & Gas Company, LTD. | Same (Calgary, Seattle) | |
| Gordon Street, Inc. | North American Royalties, Inc. | |
| Gothic Energy Corporation (Tulsa) | Chesapeake Gothic Corp. | |
| GPM Corp. | Duke Energy Field Services | |
| Grace Petroleum Corporation | Samson Natural Gas Company | |
| Grace, W.R. | Grace Petroleum Corporation | |
| Grace, W.R. and Company | Grace Petroleum Corporation | |
| Graham Exploration | Same | |
| Graham-McMormick Oil & Gas | Ladd Petroleum Corp. | |
| Graham, Keith D. | Omni Petroleum Corporation | |
| Grand Valley Natural Gas Company | Same | |
| Granite Falls Rock, Inc. | Same (Meridian Oil Inc.) | |
| Graridge (American Petroleum) | Petco, Inc. | |
| Grayhill Exploration | U.S. Minerals Exploration | |
| Grayson Mill Energy | Devon Energy | |
| Great Expectations | Same | |
| Great Lakes Energy Partners, LLC | Same (Affil: Range Resources Corp. & FirstEnergy Corp.) | |
| Great Plains Development | Phillips Petroleum Company | |
| Great Western Resources, Inc. | Forcenergy, Inc. | |
| Great WTN Exploration (NV) Inc. | Great WTN Onshore Inc. | |
| Green Tree Resources, Inc. | Spring Resources, Inc. | |
| Greenbrier Operating Company | Same | |
| Greenwald, L. Scotty, & Assoc. | MacOil & Gas International | |
| Greenwood Holdings Inc. | Packaging Research Corp. | |
| Greka Energy Corp. | Same (New York City) | |
| Gressel Corp. | VAL Energy, Inc. | |
| Greystone Petroleum, LLC (Houston) | Chesapeake Energy Corp. | |
| Grove Oil & Gas | Same | |
| Gruy Petroleum Management Co. | Same (Subsid: Magnum Hunter Resources, Inc.) | |
| Gryphon Exploration, Inc. (Houston) | Woodside Petroleum, Ltd. | |
| Guaranty Energy | Same | |
| Guidon Operating | Diamondback Energy | |
| Gulf Energy | Chevron USA, Inc. | |
| Gulf Oil Company | Gulf Oil Corporation | |
| Gulf Oil Corporation | Chevron USA, Inc. | |
| Gulf Production Corporation | Same (Subsid: Coastal Oils, Inc. – OKC) | |
| Gulf Resources Corp. | Same | |
| Gulfco Industries, Inc. | Petroleum Services, Inc. | |
| Gulfport Energy Inc. | Same (Oklahoma City) | |
| Gulfstream Resources Canada, Ltd. | Anadarko Petroleum Corp. | |
| Gulfstream Resources Corp. (USA) | Same | |
| Gulfwest Energy Inc. | Same | |
| GulfWest Oil Company | Gulfwest Energy Inc. | |
| GW Merger Corp. | Great WTN Onshore Inc. | |
| GW Petroleum Inc. | Great WTN Onshore Inc. | |
| GWP Inc. | Great WTN Onshore Inc. | |
| GWR Inc. | Great WTN Onshore Inc. | |
| GWR Operating Company | Great WTN Onshore Inc. | |
| Gypsy Oil Company | Gulf Oil Corporation | |
| H-30 Drilling Inc. | Columbian Energy Co., L.P. | |
| H.P. Oil & Gas Properties, Inc. | Deepko Lease & Royalty Co. | |
| H&H Star Energy, Inc. | Same (Subsid: Howard Company) | |
| H2O Midstream | Delek US Holdings | |
| Hadson Energy Resources Corp. | Apache Corporation | |
| Hadson Ohio Oil Company | Hadson Petroleum Corporation | |
| Hadson Petroleum Corporation | Hadson Energy Resources Corp. | |
| Hallador Exploration Company | Hallador Petroleum Company | |
| Hallador Petroleum Company | Same | |
| Halley Energy Corporation | Cytoprobe Corporation | |
| Halliburton Company | Same | |
| Hallwood Energy Corporation | Same (Subsid: Chesapeake Energy Corp.) | |
| Hallwood Energy Corporation III | Same (Subsid: Chesapeake Energy Corp.) | |
| Hallwood Energy Partners, L.P. | Same | |
| Hallwood Petroleum, Inc. | Same | |
| Hallwood Petroleum, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Halwell Company, Inc. | Same | |
| Hambro Gas & Oil Company | Enron Oil & Gas Company | |
| Hamilton Dome | Same | |
| Hamilton Oil Corp. | Broken Hill Proprietary Co. Ltd. | |
| Hammond, J.G. | JGM Company | |
| Hammond, John G. | Beard & Hammond | |
| Hampton Resources Corp. | Bellwether Exploration Company | |
| Hancock Oil & Gas Company | Hancock Oil Company | |
| Hancock Oil Company | Signal Company | |
| Hanna Company, The M.A. | Same | |
| Hanna Petroleum Company | The M.A. Hanna Company | |
| Hanover Petroleum | Total Petroleum, Inc. | |
| Harbert Energy Corporation | Forest Oil Corporation | |
| Harbour Gas & Oil LTD | Same (Affil: Torch Energy Corporation) | |
| HarCor Exploration, Inc. | Seneca Resources Corp. | |
| Harden Oil and Gas | Same | |
| Hardy Oil & Gas USA Inc. | Same | |
| Hare – Hoppan Reserves Group (U.S. Assets) | Hare Resources Americas, Inc. | |
| Hare Resources Americas, Inc. | Distinct Properties Energy, Inc. | |
| Hare-Distinct Acquisition Corp | Goane-Gitch (US), Ltd. | |
| Harken Energy Corporation (Dallas) | Same | |
| Harken Exploration Company | Same (Subsid: Harken Energy Corporation) | |
| Harken Oil & Gas, Inc. | Harken Energy Corp. | |
| Harper Oil and Gas, Inc. | Apache Corporation | |
| Harper Oil Company | Harper Oil and Gas, Inc. | |
| Harper, F.E., & Cornell | Same | |
| Hartex-Anadarko Permian Basin Partnership | Enron Oil & Gas Company | |
| Harvest Energy Trust | Same | |
| Harvestor Oil and Gas Co. | Same (Subsid: GAE Corp.) | |
| Harvey E. Yates Company | Matador Resources Company | |
| Harvey E. Yates Company (MRC merger) | MRC Delaware Resources LLC | |
| Hathaway Company | Pyramid Oil | |
| Hawks Industries, Inc. | Same | |
| Hawthorne Oil and Gas Corporation | Same (Subsid: American Nat’l Petroleum Co.) | |
| HD Oil Company | Homer Dean Oil Company | |
| Headington Canada Corp. | Same | |
| Headington Oil Company | Headington Canada Corp. | |
| Hefner Company, The | Arbuckle Oil Corporation | |
| Hefner Exploration Company | Same | |
| Heisler, W.H., Jr. | Same | |
| Helix Energy Solutions Group | Same | |
| Helmerich & Payne, Inc. | Cimarex Energy Company | |
| Helping Hand Energy, Ltd. | Same | |
| Hemmings Corp. | Blackbird Co. | |
| Henderson Petroleum Corp. | Burkhart Petroleum Corp. | |
| Herboil Company | DMF Resources Inc. | |
| Hercules Offshore Corp. | Parker Drilling Company | |
| Hercules Rig Corp. | Parker Drilling Company | |
| Heritage Energy Resources, Inc. | Same | |
| Heritage Gas Services, LLC | CMS Energy Corp | |
| Heritage Glacier Park Company | Same (Affil: Meridian Oil Inc. | |
| Heritage Group, The | Same | |
| Hershey Oil Company | Same (Subsid: American Exploration Company) | |
| Hess Corporation | Chevron | |
| Hess Oil Corp. | Amerada Hess Corporation | |
| HEYCO Energy Group (Permian Assets) | Matador Resources | |
| HEYCO Energy Group Inc. | Matador Resources Company | |
| HG Energy | Antero Resources | |
| Hickock & Reynolds | Ibex & Windfohr | |
| Hickory Creek Development Company | Hanna Petroleum Company | |
| High Plains Oil Corporation | Same | |
| High Point Investments | Same | |
| Highland Production Company | Quay Valley Inc. | |
| Hildago-Willacy Oil Company | CNG Producing Company | |
| Hillin-Simon Oil Company | Okland Oil Company | |
| Hinkle Engineering, Inc. | Same | |
| Hixon Development Company | Giant Exploration & Production Company | |
| HNG | Enron Oil & Gas Company | |
| HNG Fossil Fuels Company | Enron Oil & Gas Company | |
| HNG Offshore Properties, Inc. | Enron Oil & Gas Company | |
| HNG Oil company | HNG | |
| HO&M | Houston Oil & Minerals Corporation | |
| Hodge, T.F. | Same | |
| Hola Communications Inc. | Tamm Oil & GasCorp. | |
| Holly Corp. | Same (Merger with Frontier in litigation 2006) | |
| Holly Energy Company | Enron Oil & Gas Company | |
| Homa Oil & Gas Corp. | Consumers Gas Company | |
| Homa Oil Company | Consumers Gas Company | |
| Homco International, Inc. | Same | |
| Home Petroleum Corporation | Presidio Oil Company | |
| Home-Stake Oil & Gas Co. | Same (Subsid: Cortez Oil & Gas, Inc.) | |
| Home-Stake Royalty Corp. | Home-Stake Oil & Gas Co. | |
| Homer Deal Oil Company | Same | |
| Hondo Oil & Gas Co. (New Company formed 1989, Not ARCO) | Devon Energy Corporation | |
| Hondo Oil & Gas Company | Atlantic Richfield Company | |
| Honolulu Oil Company | Pan American Petroleum Company | |
| Horizon Oil & Gas Co. | Same | |
| Horizon Oil & Gas Co. of Texas | Horizon Oil & Gas Co. | |
| Horizontal Ventures Inc. | Greka Energy Corp. | |
| Houston Gas & Fuel Company | Arkansas Natural Gas Company | |
| Houston Gas Light Company | Houston Gas & Fuel Company | |
| Houston Natural Gas Corp. | Enron Oil & Gas Company | |
| Houston Oil & Energy, Inc. | Golden Triangle Royalty & Oil, Inc. | |
| Houston Oil & Minerals Corp. | Tenneco Oil Company | |
| Houston Oil Company of Texas | Atlantic Refining Company | |
| Houston Oil Trust | Seagull Energy Corp. | |
| Houston Operating Company | Same (Subsid: Normandy Oil & Gas Co.) | |
| Houston Petroleum Company | MSR Exploration LTD. | |
| Houston Royalty Corp. | Houston Oil & Minerals Corp. | |
| Howard Energy Company | Same | |
| HPC, Inc. | Home Petroleum Corp. | |
| HS Resources, Inc. | Kerr-McGee Corporation | |
| HS Resources, Inc. (mid-continent) | Questar Exploration and Production Company | |
| HSRTW, Inc. (HS/Tide West) | Questar Exploration and Production Company | |
| HTR Gas Transmission Co. | Same (Subsid: Engineering, Inc.) | |
| Hudson Energy Inc. | Same (Affil: Torch Energy Corporation) | |
| Hughes Eastern Petroleum, Inc. | Prairie Producing Company | |
| Hughes Oil & Gas, Inc. | Texas Meridian Resources, Ltd. | |
| Hughes Tool Company | Same | |
| Hughes, B.J., Inc. | Hughes Tool Company | |
| Hugoton Capital Ltd. Partnership | Mesa Operating Company | |
| Hugoton Energy Corp. | Chesapeake Mid-Continent Corp. | |
| Hugoton Management Company | Mesa Operating Company | |
| Hugoton Production Company | Mesa, Inc. | |
| Humble Oil & Refining Co. | ExxonMobil | |
| Humble Oil & Refining Company | Exxon Corporation | |
| Hunt Energy Corp. | Rosewood Resources, Inc. | |
| Hunt Oil (H.L. Hunt Est.) | Same | |
| Hunt Oil Company | Same | |
| Hunt Petroleum Corp. | ExxonMobil | |
| Hunt Petroleum Corp. (Dallas) | Same | |
| Hunter Company, Inc. | ARKLA Exploration Company | |
| Hunter Resources, Inc. | Magnum Petroleum, Inc. | |
| Husky Energy (Western Canadian Assets) | ConocoPhillips | |
| Husky Energy, Inc. | Same | |
| Husky Oil Company | Marathon Petroleum Company | |
| Hut Oil Company | G.L.M. Oil and Gas Company | |
| Hutton Oil and Gas Corp. | Same | |
| Hutton/EAIC | Same (Affil: Torch Energy Corporation) | |
| Hydro Carbon Trading-Transport Co., Inc. | Same | |
| Hydrogen Energy Corporation | Same | |
| Hytech Energy Corp. | Moran Brothers | |
| HYTK Industries, Inc. | Quest Resources Corp. | |
| Ibex | Petco, Inc. | |
| Ibex & Windfohr | Same | |
| Ibex Resources Company, LLC | Same (Affil: JMA Energy Co., LLC) | |
| ICOS Energy Corp. | Charlestown Industries, Inc. | |
| IDC Energy Corp. | Same | |
| IEI Exploration, Inc. | Ocean Energy, Inc. | |
| IES Industries, Inc. | Same | |
| III Exploration Company | Same (Subsid: Intermountain Industries Inc.) | |
| Illini Carrier LP | Same (Affil: Torch Energy Corporation) | |
| Illinova Corp. | Dynegy, Inc. | |
| Imperial Oil and Gas Inc. | ONEOK Exploration Co. | |
| Imperial Petroleum | Moss Petroleum Company | |
| Imperial Petroleum, Inc. | Same | |
| Income Share, Inc. | Aberdeen Petroleum Corporation | |
| Independent Exploration Company | Same | |
| Independent Oil Company | Shell Oil Company | |
| India Temple Minerals Co. | Helping Hand Energy, Ltd. | |
| Indian Oil Company | Coral Reserves Group | |
| Indian Refining Co. | Chevron | |
| Indian Royalty Company | Cronell Oil Company | |
| Indian Territory Illuminating Oil Co. | Cities Service Oil Company | |
| Indian Wells Oil Company | Parker & Parsley Petroleum Company | |
| Indrex, Inc. | Integrated Drilling & Exploration, Inc. | |
| Industrial Gas Company | Arkansas Natural Gas Company | |
| Inexco Oil Company | Louisiana Land & Exploration Co. | |
| Infinity Inc. | Same (Chanute, KS) | |
| Inland Fuels Corporation | Inland Resources, Inc. | |
| Inland Resources, Inc. | Newfield Exploration Company | |
| Integrated Drilling & Exploration Inc. | Same | |
| Integrated Energy, Inc. | MCO Resources (Integrated) Corp. | |
| Inter-City Gas | Same | |
| Interamerican Corp. | Hunter Resources, Inc. | |
| InterCoast Gas Services Co. | KCS Medallion Resources, Inc. | |
| InterCoast Oil and Gas Company | KCS Medallion Resources, Inc. | |
| Intergen (North America), Inc. | Same (JV of Shell Oil and Bechtel Enterprises) | |
| Intermoutain Industries Inc. | Same | |
| International Colin Energy Corp. | Same | |
| International Nuclear Corp. | Inexco Oil Company | |
| International Oil & Gas Corp. | DEPCO, Inc. | |
| International Recovery Corporation | World Fuel Services Corp. | |
| International Telephone | Sonat Exploration Company | |
| InterNorth, Inc. | Enron Oil & Gas Company | |
| Interstate Production Company | Northern Natural Gas Producing Company | |
| Intex | Shell Western E & P, Inc. | |
| Intoil Inc. | Same | |
| Investors Royalty Company | Dalco Oil Company | |
| Iowa-Illinois Gas and Electric Company | MidAmerica Energy Company | |
| Iowas Resources Inc. | Midwest Resources Inc. | |
| Iron Mountain Oil Company | Same | |
| Island Oil Company | Penrose Production Company | |
| Ivahoe Energy Inc. | Same (Vancouver) | |
| Ivanhoe Energy, Inc. | Same (Vancouver, BC) | |
| J & B Royalty Company | Wilco Properties, Inc. | |
| J-O’B Operating | Same | |
| J. P. Oil Company Inc. | J. P. Oil Company LLC | |
| J. P. Oil Company LLC | Same | |
| J.O.C. Operating, Inc. | Same (Subsid: Jefferson Oil Corp) | |
| Jackalope-New Mexico Oil Co. | Lacy Ranch Petro Corp. | |
| Jade Resources, Inc. | Consolidated Oil & Gas, Inc. | |
| Jagged Peak Energy | ExxonMobil | |
| Jal Oil Company | Sun Company, Inc. | |
| James Energy Management, Inc. | Consolidated Oil & Gas, Inc. | |
| James River Corporation | Cavenham Forest Industries Inc. | |
| James, T.L. & Co. | St. Mary Land & Exploration Co. | |
| Jan-Dal Petroleum | Same | |
| JAN-DI Corp. | Judd A. Nelson, Inc. | |
| Japex (U.S.) Corp. | Same (Subsid: Japan Petroleum Exploration Co.) | |
| Jath Oil Company | Mack Energy Company | |
| JED Oil Inc | Same | |
| Jefferson Oil Corp (Dallas) | Same | |
| Jergins Oil Company | Exxon Company USA | |
| Jet Oil Company | Deminex U.S. Oil Corp. | |
| JGM Company | Same | |
| JM Petroleum Corporation | Phibro Energy, Inc. | |
| JMA Energy Company, LLC | Same (Oklahoma City) | |
| JMA Energy, Inc. | JMA Energy Company, LLC | |
| JMA Resources, Inc. | JMA Energy, Inc. | |
| JMG Exploration Inc. (Nevada) | JED Oil Inc. | |
| JN Exploration & Production Limited Partnership | Same (Subsid: JN Oil and Gas, Inc.) | |
| JN Oil and Gas, Inc. | Same | |
| JN Petroleum Marketing, Inc. | Same (Subsid: JN Oil and Gas, Inc.) | |
| Jocelyn-Varn Oil | Varn Oil Company | |
| John D. Oil and Gas Company | Same (Cleveland, OH) | |
| John I. & P.D. Moore | Same | |
| Johnson, F.K. | Ambassador Petroleum Corp. | |
| Jones, L.E. Operating, Inc. | Same (Affil: L.E. Jones Production Company) | |
| Jones, L.E. Production Company | Same | |
| Jonnell Gas Company | Chevron USA, Inc. | |
| JR Oil and Gas, Inc. | Same (Houston) | |
| Justice Oil Company, LLC | Justice Oil and Gas LLC | |
| Justis Supply Company | Key Energy Group, Inc. | |
| K-C Gas Company of New York | Ocean Energy, Inc. | |
| K-M Permian, Inc. | Kerr-McGee North American Onshore Corporation | |
| K-N Energy, Inc. (Lakewood, CO) | Sempra Energy, Inc. | |
| K-N Production Company | Tom Brown, Inc. (Midland) | |
| K. Stewart Petroleum Corporation | Chesapeake Energy Corporation | |
| K.E. Resources Ltd. | American Resources of Delaware, Inc. | |
| K.R.M. Petroleum Corp. | PrimeEnergy Corporation | |
| K2 Energy Corp. | Resillient Resources, Ltd. | |
| Kaifser Resources | Same | |
| Kaiser-Francis Oil Company | Same | |
| Kallispell Glacier Park Company | Same (Affil: Meridian Oil Inc.) | |
| Kaneb Energy Company | Same | |
| Kaneb Production Company | Kaneb Energy Company | |
| Kansas-Nebraska Natural Gas Company | K-N Energy, Inc. | |
| Katz Oil Company | Sohio Petroleum Company | |
| KCS Energy Inc. | Petrohawk Energy Corporation | |
| KCS Medallion Resources, Inc. (Tulsa) | Same (Subsid: KCS Energy Inc.) | |
| KEC Acquisition Corp. | Same (Subsid: American Exploration Company) | |
| Keldon Oil Company | Pittencrieff America, Inc. | |
| Kelley Oil & Gas Corp. | Contour Energy Company | |
| Kelley Oil & Gas Partners Ltd. | Kelley Oil & Gas Corp. | |
| Kelley Oil Corp. | Kelley Oil & Gas Corp. | |
| Kellog Oil Company | Richfield Oil Company | |
| Kellogg Company, The M.W. | Halliburton Company | |
| Kencope Energy Company | Same | |
| Kennecott Corp. | Same | |
| KerMac | Kerr-McGee | |
| Kern County Land Company | Tenneco Oil Company | |
| Kern Oil California (producing properties) | Texaco USA, Inc. | |
| Kernridge Oil Company | Same | |
| Kerr-McGee Corporation | Anadarko Petroleum Corporation | |
| Kerr-McGee North American Onshore Corp. | Devon Energy Corporation | |
| Kerr-McGee North American Onshore Corporation | Devon Energy Corporation | |
| Kerr-McGee Oil & Gas Company | Same (Subsid: Kerr-McGee Corporation) | |
| Kestrel Energy, Inc. | Same | |
| Kewanee Oil Company | Chevron USA, Inc. | |
| Key Energy Group, Inc. | Same | |
| Key Production Company, Inc. | Same (Subsid: Cimarex Energy Company) | |
| Keystone Asset Mgt. Inc. | Richland Resources Corp. | |
| Keystone Exploration, Inc. | Same | |
| Kimbark Oil & Gas Company | Halador Petroleum Company | |
| Kimmerer Oil | Chevron USA, Inc. | |
| Kinder Morgan Energy Partners, LP | Same | |
| King Ranch Energy Inc. | St. Mary Energy Company | |
| King Ranch Oil & Gas Co. | STEX Energy Company | |
| Kinlaw Energy Partners, L.P. | Akin, Matthew | |
| Kinsey Interests | Same | |
| Kinson Resources, Inc. | Patrick Petroleum Company | |
| Kirby Exploration Company | Same | |
| Kirby Petroleum (Reeves) | Same | |
| Kirby Petroleum (Toklan) | Kirby Petroleum (Reeves) | |
| Kirby Petroleum Company | Kirby Exploration Company | |
| Kirby Production Company | Kirby Exploration Company | |
| Kiwanda Energy, Inc. | Argent Energy, Inc. | |
| KNDA | Chevron USA, Inc. | |
| KNOC USA Corp. | Same (Affil: S. Korean Government) | |
| Koch Industries, Inc. | Same | |
| Koch Midstream Gas Marketing Company | Same (Subsid: Koch Industries, Inc.) | |
| Koch Midstream Gasmark Company | Same (Subsid: Koch Industries, Inc.) | |
| Koch Midstream Services Company | Same (Subsid: Koch Industries, Inc.) | |
| KPX, Inc. | Ocean Energy, Inc. | |
| Krider & Affiliates Petroleum Corp. | Monarch Petroleum Company | |
| KSA Industries, Inc. | Adams Resources & Energy, Inc. | |
| L F Oil | Union Oil Company | |
| L L & E | Louisiana Land & Exploration Company | |
| L L & E Royalty Trust | Louisiana Land & Exploration Company | |
| L. and V. Oil Company | Bell Oil and Gas Company | |
| Lacy & Byrd, Inc. | Byrd Operating Co. | |
| Lacy Ranch Petro Corp. | Same | |
| Ladd & Lukowicz, Inc. | Eureka Oil Company | |
| Ladd Petroleum Corp. | Amax Oil & Gas, Inc. | |
| LAE Energy Inc. | Same (Affil: Torch Energy Corporation) | |
| Lambert Oil | Cameriana Petroleum Corp. | |
| Lamson Onshore Oil Corporation | Same | |
| Laramide, LLC | Same | |
| Laredo Energy, II, LP | Same (Subsid: Chesapeake Energy Corp.) | |
| Lariat Petroleum Inc. (Tulsa) | Newfield Exploration Company | |
| Lariat Services, Inc. | Same (Subsid: Sandridge Energy, Inc.) | |
| Lario Oil & Gas (Permian Assets) | Diamondback Energy | |
| Lario Oil & Gas Company | Same | |
| Laser Oil Company | Same (Affil: Axem Resources Incorporated) | |
| LASMO Canada, Ltd. | Elan Energy, Ltd. | |
| LASMO Energy Corp. | Amerada Hess Corp. | |
| LaTex Resources, Inc. | Alliance Resources PLC | |
| Latigo Oil & Gas Invc. (Woodward, OK) | Same | |
| Latigo Petroleum, Inc. (Tulsa) | Pogo Producing Company | |
| Laurel Operating Company, Inc. | Union Pacific Resources Company | |
| Lawton Oil | Colorado Oil & T & P | |
| LBJ Petroleum Corp. | Earlsboro Energies Corp. | |
| LDEC Acquisition Corp. | Same (Subsid: Louis Dreyfus Energy Corp.) | |
| Lear Petroleum Corp. | Same | |
| Lear Petroleum Partners Operating Co. LP | LPPOC | |
| Leonard Oil Company | Tenneco Oil Company | |
| Leredo Petroleum Inc. | Same (Tulsa) | |
| Lewis Producing Company | Texaco USA, Inc. | |
| Lewis Production Company | Texaco USA, Inc. | |
| Lexco | Lowe Associates | |
| Liberty Natural Gas Company | Seagull Energy Corporation | |
| Liberty Self-Stor, Inc. | John D. Oil and Gas Company | |
| Liedke | Pennzoil Company | |
| Lime Rock Partners | Same (Westport, CT) | |
| Limpia Royalty | Kewanee Oil Company | |
| Line Oil Well Service | NOMOC Oil Company, Inc. | |
| Link Energy Limited Partnership | Plains Pipeline LP | |
| Linn Energy Inc. | Same | |
| Lion | Monsanto | |
| Lipan | Texota | |
| Liquid Carbonic Intrastate Pipeline Company | Integrated Drilling & Exploration, Inc. | |
| Little America Refining Co. | Sinclair Oil Corporation | |
| Little Rock Gas & Fuel Company | Arkansas Natural Gas Company | |
| Livermore, G.P., Inc. | Great Western Oil | |
| Livingston Oil Company | LVO Corporation | |
| LLOG (Select) | Harbour Energy | |
| Lomak Energy Services Co. | Subsid: Lomak Petroleum, Inc. | |
| Lomak Petroleum, Inc. (Ft. Worth) | Range Resources Corp. | |
| Lone Pine Resources Ltd. | Ocelot Energy Inc. | |
| Lone Star Producing Company | Ensearch Exploration Company | |
| Lonewolf Energy LLC | Lonewolf Energy, Inc. | |
| Lonewolf Energy, Inc. | Same | |
| Long Point Corporation | Socony Mobil Oil Company, Inc | |
| Loram International | Same | |
| Lorena Oil Company | Getty Oil Company | |
| Los Angeles Oil and Refining Company | Richfield Oil Company | |
| Los Nietos | Union Oil Company | |
| Lotus Midstream | Energy Transfer | |
| Louisiana Hunt Petroleum | Same | |
| Louisiana Land & Exploration Co. (LL&E) | ConocoPhillips | |
| Louisiana Land & Exploration Company | Burlington Resources Corp. | |
| Lovelady, I.W. | Aberdeen Petroleum Corporation | |
| Lowe Associates | Same | |
| Lowe Partners, LP | Maralo, LLC | |
| Lowe Petroleum | Maralo, LLC | |
| Lowe Royalty Partners, LP | Maralo, LLC | |
| Lowe, Ema | Maralo, LLC | |
| Lowe, M. Ralph, Inc. | Maralo, LLC | |
| Lowe, Ralph | Maralo, LLC | |
| Lowe, Ralph (Estate) | Maralo, LLC | |
| LPPOC | Minatome Corporation | |
| LRF Corp. | French Petroleum Corp. | |
| Lubel Oil Company | Hutton Oil and Gas Corp. | |
| Lucid Energy Group | Targa Resources | |
| Lukoil Americas Inc. | Same (Subsid: Lukoil Oil Company) | |
| Lukoil Oil Company | Same (Russia) | |
| Lumen Energy, Inc. (Oklahoma City) | Same | |
| Lundin Energy | Aker BP | |
| LVO Corporation | Utah International, Inc. | |
| Lyman, C. V. (Winkler) Estate | Rycade | |
| Lynx Exploration Company | Lomak Petroleum, Inc. | |
| M & M Production Co. | Tenneco Oil Co. | |
| M-R Holdings Acquisition Company | Same (Affil: Meridian Oil Inc.) | |
| M-R Holdings Inc. | Same (Affil: Meridian Oil Inc.) | |
| M.A.T. Oil & Gas Exploration, Inc. | Same | |
| MA Resources Company, LLC | Same (Affil: JMA Energy Company, LLC) | |
| Macbois Realti, Inc. | MacOil & Gas International | |
| MacDonald Oil Corporation | Aberdeem Petroleum Corporation | |
| Mack Energy Company | Same | |
| MacOil & Gas International (Spring, TX) | Same | |
| Madison Energy Corp. | Adobe Resources Corporation | |
| Madison Oil Company | Toreador Resources Corporation | |
| MAFCO | Chevron USA, Inc. | |
| Magellan/Mapco | ONEOK/Williams | |
| Magic Circle Energy Corp. | Same (Subsid: Carlton Resources Corp.) | |
| Magna Oil Corporation | Triton Oil & Gas Corp. | |
| Magness Petroleum Company | Cleary Petroleum Corporation | |
| Magnolia Oil Company | Magnolia Petroleum Company | |
| Magnolia Petroleum Co. | ExxonMobil | |
| Magnolia Petroleum Company | Socony Mobil Oil Company, Inc. | |
| Magnum Hunter Resources, Inc. | Same (Dallas) | |
| Magnum Petroleum, Inc. | Magnum Hunter Resources, Inc. | |
| Majestic Oilfield Services, Inc. | Same (Subsid: PetroQuest Resources Inc.) | |
| Malco Refining | Hondo Oil and Gas Company | |
| Mallard Bay Drilling Inc. | Parker Drilling company | |
| Mallard Petroleum, Inc. | Olds Petroleum Corporation | |
| Mammoth Oil Company | Berry Petroleum Corporation | |
| Manhattan Resources Corp. | Manhattan Resources Ltd. | |
| Manhattan Resources Ltd. | Same (Calgary) | |
| Mapco Oil & Gas Company | CNG Producing Company | |
| Mapco Production Company | Mapco Oil & Gas Company | |
| MAPCO, Inc. | Williams Companies, The | |
| Maplewood Glacier Park Company | Same (Affil: Meridian Oil Inc.) | |
| Maralo Merging Corporation | Maralo, LLC | |
| Maralo, Inc. | Maralo, LLC | |
| Maralo, LLC (Midland) | Same | |
| Marathon Oil Company | Marathon Oil Corporation | |
| Marathon Oil Corporation | Same (Houston) | |
| Marathon Petroleum Company | Marathon Resources Corp. | |
| Marathon Resources Corp. | Same (Subsid: USX Corp.) | |
| Mariner Energy, Inc. | Same | |
| Mark Production Company | Mewbourne Oil Company | |
| MarkWest Coalseam Development Co., Inc. | MarkWest Resources Inc. | |
| MarkWest Resources Inc. | Same | |
| Marland Oil Company | Marland Oil Company of Oklahoma | |
| Marland Oil Company of Oklahoma | Marland Production Company | |
| Marland Production Company | Continental Oil Company | |
| Marline Petroleum Corporation | Cheniere Petroleum Corporation | |
| Marshall Exploration, Inc. | Same (Subsid: Sonat, Inc.) | |
| Martex Drilling Company, LLP | Same | |
| Martin Exploration Management Company | Same | |
| Martine Pipeline Co. | Same (Subsid: McGoldrick Oil Company) | |
| Mass Energy Inc. | Pangaea Petroleum, Inc. | |
| Masters Energy Corporation | Harken Oil and Gas, Inc. | |
| Masterson, James A. | Laaramide, LLC | |
| Matador Petroleum Corporation | Tom Brown Inc. | |
| Matador Petroleum Corporation (Dallas) | Tom Brown, Inc. | |
| Matagorda Bay Pipeline Company | Conquest Exploration Company | |
| Matagorda Island Exploration | Same (Subskd: Anadarko Petroleum Corporation) | |
| MATCO Enterprises, Inc. | PetroQuest Resources, Inc. | |
| Matlin Petroleum Corporation | Same | |
| Matrix Energy, Inc. | Same | |
| Maudlin & Wood | Clements Energy, Inc. | |
| Maxus Energy Corporation | Same | |
| Maxus Exploration Company | Midgard Energy Company | |
| Mayflo Oil Company | May Petroleum, Inc. | |
| Maynard Oil | Plantation Petroleum | |
| MC Panhandle Corp. | Chesapeake Energy Corp. | |
| McAdams, Roux and Associates, Inc. | Plains Petroleum Company | |
| McAlester Fuel Company | Enstar Petroleum Company | |
| McAlester/Newfield | Alpetco/Encana | |
| McClurg, M. R. & Company | High Plains Oil Corporation | |
| McColl-Frontenac Oil Company, LTD | Texaco USA, Inc. | |
| McCulloch Energy, Inc. | Same (Subsid: Harken Energy Corporation) | |
| MCCulloch Gas Processing Crop. | MGPC, Inc. | |
| McCulloch Gas Transmission Company | MGPC, Inc. | |
| McCulloch Interstate Gas Corp. | MGPC, Inc. | |
| McCulloch Oil Corp. of California | MCO Resources, Inc. | |
| McCulloch Oil Corp. of Texas | MCR Oil Corp. of Texas | |
| McCulloch Oil Exploration | McCulloch Oil Corp. of California | |
| McDermott, E.H. | Wrather, J.D., Jr. | |
| McElroy Ranch Company | Warren American Oil Company | |
| McElvain Oil & Gas | McElvain, T. H., Oil & Gas Ltd. Partnership | |
| McElvain, T. H., Oil & Gas Ltd. Partnership | Same (Affil: McElvain, T.H., Oil & Gas Ltd. Ptnshp.) | |
| McElvain, T. H., Oil & Gas Properties, Inc. | McElvain, T. H., Oil & Gas Ltd. Partnership | |
| McFarland Corporation | Coral Drilling | |
| McFarland Energy, Inc. | Monterey Resources, Inc. | |
| McFarland, Inc. & Drilling | Fluor Oil and Gas Corporation | |
| McGoldrick Oil Company | Same | |
| McGowen Resources Company | Same | |
| McKee Petroleum Company | Mobil Oil Corporation | |
| McMahon, Inc., C.L. | Forest Oil Company | |
| McMan Oil & Gas Company | AMOCO Production Company | |
| McMoran Exploration Company | McMoran Offshore Expl. Company | |
| McMoran Offshore Exploration Company | Same | |
| McMoran Offshore Management Company | McMoran Offshore Expl. Company | |
| McMoran Offshore Production Company | McMoran Offshore Expl. Company | |
| McMoran Oil & Gas Company | McMoran Offshore Expl. Company | |
| McMoran Production Company | McMoran Offshore Expl. Company | |
| McMoran-Freeport Oil Company | McMoran Offshore Expl. Company | |
| McMoran-Freeport Oil Company of Oklahoma | McMoran-Freeport Oil Company | |
| MCN Corporation | Same | |
| MCNIC Oil & Gas Co. | Same (MCN Investment Corp.) Subsid: MCN Corporation | |
| MCNIC Oil & Gas Midcontinent, Inc. | Same (MCN Investment Corp.) Subsid: MCN Corporation | |
| MCO Holdings, Inc. | UMC Petroleum Corporation | |
| MCO Resources (Integrated) Corp. | Same (Subsid: MCO Holdings, Inc.) | |
| MCO Resources Belize Corp. | MCO Resources, Inc. | |
| MCO Resources Spectrum Corp. | MCO Resources, Inc. | |
| MCO Resources, Inc. | MCO Holdings, Inc. | |
| MCOR Oil & Gas Corporation | MCO Resources, Inc. | |
| MCOR Oil Development, Inc. | MCO Resources, Inc. | |
| MCOR Oil Exploration, Inc. | MCO Resources, Inc. | |
| MCR Exploration, Ltd. | MCO Resources, Inc. | |
| MCR Newcorp, Inc. | MCO Resources Spectrum Corp. | |
| MCR Oil Corp. of Texas | MCO Resources, Inc. | |
| McRae Exploration | Lear Petroleum | |
| McRae Oil & Gas Corp. | Sipco, Inc. | |
| McWilliams Moffitt | McMoran Oil & Gas Company | |
| MDU Resources Group Inc. | Same | |
| Meade Energy Corporation | Same (Oklahoma City) | |
| Meadow View, Inc. | Conquest Exploration Company | |
| MEC Exploration, Ltd. Partnership 1989-A | Midwest Energy Companies, Inc. | |
| MEC, Inc. | Midwest Energy Corp. | |
| Mecom Oil | Same | |
| Medallion Midstream (Select Assets) | ONEOK | |
| Medallion Oil Company | GHR Energy (Goodhope) | |
| Medallion Petroleum, Inc. | Same (Affil: Brighton Energy, L.L.C.) | |
| Medallion Production Company | InterCoast Oil and Gas Company | |
| Medicine Bow Energy Corp. | El Paso Corp. | |
| Mega Natural Gas Company (merger) | Associated Natural Gas, Inc. | |
| Meridian Oil Inc. | Burlington Resources Oil & Gas Company | |
| Meridian Oil Offshore Inc. | Burlington Resources Offshore Inc. | |
| Meridian Oil Production Company | Burlington Resources Oil & Gas Company | |
| Meridian Oil Trading Inc. | Burlington Resources Trading Inc. | |
| Meridian Resources Corp. | Same | |
| Merit Energy Corp. | BCF Resources, Inc. | |
| Merit Partners LP | Same | |
| MeritNet Partners, LP | Merit Partners LP | |
| Mesa Inc. | Pioneer Natural Resources USA, Inc. | |
| Mesa Limited Partnership | Mesa Inc. | |
| Mesa Operating Co. | Pioneer Natural Resources USA Inc. | |
| Mesa Operating Company | Mesa Inc. | |
| Mesa Operating Limited Partnership | Pioneer Natural Resources USA, Inc. | |
| Mesa Petroleum Company | Pioneer Natural Resources USA, Inc. | |
| Mewbourne Oil Company | Same | |
| Mexco Energy Corporation | Same (Midland, TX) | |
| MGF Oil Corporation | Southmark Corp. | |
| MGPC, Inc. | MCO Holdings, Inc. | |
| MGPC, Inc. (Powder River Basin Area) | Western Gas Processors, Ltd. | |
| Michcon | MCN Corporation | |
| Michigan Consolidated Gas Co. | Same (Subsid: MCN Corporation) | |
| Mid-America Pipeline Company | Enterprise Products Partners, LP | |
| Mid-America Resources, Inc. | Seaboard Oil Company | |
| Mid-American Investment Corp. | Conquest Exploration Company | |
| Mid-American Minerals, Inc. | Calvert Exploration Company | |
| Mid-Continent Management Corporation | Petrodynamics, Inc. | |
| Mid-Continent Petroleum | Sun Expl. & Prod. Company | |
| Mid-East Oil Company | M.A.T. Oil & Gas Exploration, Inc. | |
| Mid-Kansas Oil & Gas Company | Marathon Oil Company | |
| Mid-States Oil Corporation | Tenneco Oil Company | |
| Mid-Tex Oil & Gas | Grove Oil & Gas | |
| Mid-Western Gas Transmission | Tenneco Oil Company | |
| MidAmerica Energy Company | Same | |
| Midcon | Same | |
| MidCon Central Exploration | Apache Corporation | |
| Midcon Corp. | Occidental Petroleum | |
| Middle Bay Oil Co., Inc. | 3Tec Energy Corp. | |
| Middle States Oil Company | Midstates Oil Company | |
| Middle States Petroleum Corporation | Tennessee Gas Transmission Company | |
| Midgard Energy Company | Crescendo Resources, L.P. | |
| Midland Acquisition Corp. | Key Energy Group, Inc. | |
| Midland Resources, Inc. (Houston) | Same | |
| Midland Southwest Corporation | M.A. Hanna Company | |
| Midlands Gas Corp. | McMoran Oil & Gas Company | |
| Midpar, LP | Parker and Parsley Development Partners, LP | |
| Midstates Oil Company | Finlay Energy Corp. | |
| Midstates Oil Corporation | Middle States Petroleum Corporation | |
| Midway and Northwood | Reno Oil Company | |
| Midwest Energy Companies Inc. (Tulsa) | Clayoquot Resources, Ltd. | |
| Midwest Energy Company, Inc. | Midwest Resources, Inc. | |
| Midwest Energy Corp. | Same (Subsid: Midwest Energy Companies) | |
| Midwest Exploration Company | AMOCO Production Company | |
| Midwest Oil Corporation | Amoco Production Company | |
| Midwest Production Company | Kirby Petroleum Company | |
| Midwest Refining Co. | BP | |
| Midwest Resources, Inc. | MidAmerica Energy Company | |
| Milestone | El Paso Natural Gas Company | |
| Milestone Petroleum Inc. | Meridian Oil, Inc. | |
| Miller Oil Company, Inc. (Midland) | Mexco Energy Corporation | |
| Minatome Corporation | Total Minatome Corporation | |
| Minden Oil & Gas, Inc. | Same | |
| Minerals Management Group, Inc. | Same (Subsid: Hinkle Engineering, Inc.) | |
| Minnehoma Oil Company | Getty Oil Company | |
| Mission Corporation | Getty Oil Company | |
| Mission Development Co. | Chevron | |
| Mission Development Company | Getty Oil Company | |
| Mission Exploration, Inc. | Mission Resources, Inc. | |
| Mission Land Acquisition Company | Mission Resources, Inc. | |
| Mission Production Company | Mission Resources, Inc. | |
| Mission Resource Partners, L.P. | Same (Subsid: Mission Resources, Inc.) | |
| Mission Resources | Mission Resources, Inc. | |
| Mission Resources Corp. | Petrohawk Resources Corp. | |
| Mission Resources, Inc. | Mission Resources, Corp. | |
| Mississippi River Corporation | Natural Gas & Oil Corporation | |
| Mississippi River Trans. Corp. | Champlin Petroleum Company | |
| Missouri Valley Pipeline Company | Northern Gas and Pipeline Company | |
| Mitchell Energy & Development Corp. | Devon Energy | |
| Mitchell Energy Corp. | Devon Energy Corporation | |
| Mitchell Energy Development | Same (Subsid: Mitchell Energy Corp.) | |
| Mitchell Energy Production Company | Mitchell Energy Corp. | |
| MJB Company | Same (Affil: Torch Energy Corporation) | |
| Mobil | ExxonMobil | |
| Mobil G. C., Inc. | Same | |
| Mobil Oil Corporation | ExxonMobil Corp. | |
| Mobil Producing Texas New Mexico | Same | |
| MOG Exploration, Ltd. | MCO Resources, Inc. | |
| Mohawk Petroleum Company | Reserve Oil and Gas Company | |
| Mon-Dak Oil Corporation | Socony Mobil Oil Company, Inc. | |
| Monark Petroleum Company | Uniok Energy Corporation | |
| Moncrief, W.A. | Same | |
| Monday Oil Company | Getty Oil Company | |
| Monogram Oil & Gas, Inc. | Lomak Petroleum, Inc. | |
| Monsanto Oil Company | BHP Petroleum Company Inc. | |
| Montana-Dakota Utilities | MDU Resources Group | |
| Monte Carlo Exploration, Inc. | Rebel Exploration, Inc. | |
| Montecito Corporation | Forchall Oil | |
| Monterey Oil & Gas | Conoco Inc. | |
| Monterey Oil Company | Esso Standard Oil Company | |
| Monterey Resources, Inc. | Texaco USA, Inc. | |
| Montex Exploration Company | Same | |
| Monument Resources Inc. (Colorado) | Same | |
| Monza Oil Corporation | Estoril Producing Corporation | |
| Moore Exploration | John I. & P.D. Moore | |
| Moore McCormack Company | Moore McCormack Energy Co. | |
| Moore McCormack Energy Co., Inc. | CXY, Inc. | |
| Mooreland Oil & Gas, Ltd. | Ventura Energy, Inc. | |
| Moran Brothers | Same | |
| Moran Exploration, Inc. | Kaneb Production Company | |
| Morgan Gulf Corporation | AMOCO Production Company | |
| Moseley Petroleum Corporation | Triton Oil & Gas Corp. | |
| Moss Petroleum Company | Petco, Inc. | |
| Moss, P. | Union Oil Company | |
| Mosswood Oil & Gas Ltd. | Same (Subsid: Noble Affiliates Inc.) | |
| Mountain & Plains Oil Company | Aberdeen Petroleum Corporation | |
| MPTNM, Inc. | Mobil Prod. Of Tex & New Mex. | |
| MRM Oil & Gas, Inc. | Coda Energy, Inc. | |
| MSR Exploration LTD. | Same | |
| MTS Limited Partnership | Mesa, Inc. | |
| Multistates Oil Properties N.V. | Mesa, Inc. | |
| Multistates Oil Properties, Inc | Mesa, Inc. | |
| Munance Corp. | Atlantic Refining Company | |
| Murchison Exploration, Inc. | Murexco Petroleum, Inc. | |
| Murexco Petroleum, Inc. | Same | |
| Murphy Oil Company of Oklahoma, Inc. | Chevron USA, Inc. | |
| Murphy Oil Corporation | Same (El Dorado, AR) | |
| Murphy Oil USA, Inc. | Same (Subsid: Murphy Oil Corporation) | |
| Murwell Resources Ltd. | Same | |
| Mustang Energy Corp. | Mustang Fuel Corporation | |
| Mustang Fuel Corporation | Same | |
| Mustang Oil & Gas Corp. | Same (Subsid: Gulf Resources Corp.) | |
| Mustang Production Company | Mustang Fuel Corporation | |
| Mustang Services Company | Mustang Fuel Corporation | |
| Mustang Services International Company | Mustang Fuel Corporation | |
| Muzzstang Ventures Company | Mustang Fuel Corporation | |
| MW Petroleum Corporation | Same (Subsid: Apache Corporation) | |
| MWJ Producing Company | Ocotillo | |
| MzRL Partners, LP | Maralo, LLC | |
| N.E. Financial Inc. | Same (Affil: Torch Energy Corporation) | |
| Nabors Industries, Inc. | Same | |
| Nadel and Gussman, Inc. | Same (Tulsa) | |
| Nalley Steel | Schlacter, D.A. | |
| Nance Petroleum Corporation | Same ( Subsid: St Mary Land & Exploration Co.) | |
| Nanome Aggregates Inc. | Same (Affil: Meridian Oil Inc.) | |
| National Energy Group, Inc. | Same | |
| National Exchange, Inc. | Same (Affil: Meridian Oil Inc.) | |
| National Exploration | Rosewood Resources | |
| National Petroleum Company | Richfield Oil Company | |
| National-Oilwell Inc. | National-Oilwell Varco Inc. (Houston) | |
| Natomas Company | Diamond Shamrock Exploration Co. | |
| Natomas Exploration Company | Natomas North America, Inc. | |
| Natomas North America, Inc. | Diamond Shamrock Exploration Co. | |
| Natomas of Oklahoma, Inc. | Natomas North America, Inc. | |
| Natural Gas & Oil Corporation | Same | |
| Natural Gas Corporation of California | Pacific Gas & Electric Company | |
| Natural Gas Dynamics, Inc. | American National Petroleum Co. | |
| Natural Gas Partners, LLC | Merchant Gas Partners, LLC (Affil: Aquilla Energy Corp.) | |
| Natural Resource Management Corp. | Edisto Resources Corp. | |
| Natural Resources Compressor Company | Same (Subsid: NJR Energy Corporation) | |
| Natural Resources Corporation | Ocean Energy, Inc. | |
| Nava Tex Drilling Company | Benz Oil Corporation | |
| Navajo Refining Inc. | Same (Subsid: Holly Corporation) | |
| Navarro | Conoco Inc. | |
| Navidad Oil & Gas Company | Boltex Oil & Gas Company | |
| Navitas Midstream | Enterprise Products Partners | |
| Nearbug, E.E. | Nearbug Producing Company | |
| Nearburg Producing Company (Midland, TX) | Same | |
| Neely & Neely | Iron Mountain Oil Company | |
| NEG Oil & Gas LLC (Carl Icahn) | SandRidge Energy, Inc. | |
| NEI Arkansas Gathering, Inc. | Warren Arkansas Gathering, Inc. | |
| Nelson Petroleum Company | Grace Petroleum Corporation | |
| Nelson, Inc., Judd A. | Americex, Inc. | |
| Nelson, W. Paul & Company | Same | |
| Nerco Oil & Gas, Inc. | Louisiana Land & Exploration Co. | |
| NERCO, Inc. | Kennecott Corp. | |
| Nerox Energy Corporation (Upland, CA) | Same | |
| New Jersey Natural Resources Company | Same (Subsid: NJR Energy Corporation) | |
| New London Resources Inc. | Same (Subsid: New London Inc.) | |
| New Mexico San Juan Natural Gas Company | Delhi-Trading Incorporated | |
| New Pacific Ventures (Denver) | Tatonka Oil and Gas Inc. | |
| New World Development Co., Ltd. | Same | |
| New Zealand CQX Limited | Same (Subsid: Louis Dreyfus Natural Gas Corp.) | |
| Newfield Exploration Company | Same (Houston) | |
| Newmont Oil Company | Mobil Oil Corporation | |
| Newport Petroleum Corporation (Calgary) | Hunt Oil Company | |
| Newstar Energy Inc. | Newstar Resources Inc. | |
| Newstar Resources Inc. | Same | |
| NEXCO Inc. | Same (Subsid: Noble Affiliates Inc.) | |
| Nexen Inc. | Same | |
| NFC Corporation | MGF Oil Corporation | |
| NGC Energy Resources, Ltd. Partnership | Warren Energy Resources, Ltd. Partnership | |
| NGC Energy, Inc. | Warren Energy, Inc. | |
| NGC Liquids Marketing, Inc. | Warren Gas Liquids, Inc. | |
| Ni-Gas, Inc. | Nicor Exploration Company | |
| Niagara Mohawk Power Corp. | Same | |
| Nicklos Oil & Gas Company | Same | |
| Nicor Exploration and Production Company | Scana Petroleum Resources, Inc. | |
| Nicor Exploration Company | Scana Petroleum Resources, Inc. | |
| Nicor, Inc. | Same | |
| Nimrod Natural Gas Company | Lumen Energy, Inc. | |
| Ninian Oil Company | Same (Subsid: American Exploration Company) | |
| Ninian Oil Finance Corp. | Same (Subsid: American Exploration Company) | |
| NiSource, Inc. | Same | |
| NJR Energy Corporation | Same | |
| NJRE Operating Company | Same (Subsid: NJR Energy Corporation) | |
| Noble Affiliates Inc. | Noble Energy Inc. | |
| Noble Energy Inc. | Same (Houston) | |
| Noble Energy, Inc. | Chevron | |
| Noble, I. | Samedan Oil Corporation | |
| Nolonger Fuel Co., Inc. | Mustang Production Company | |
| Nomac Drilling Corporation | Same (Subsid: Chesapeake Energy Corporation) | |
| NOMECO Oil & Gas Company | Same | |
| NOMOC Oil Company, Inc. | Same | |
| NorAm Energy Corp. | Same | |
| Noranda Oil Corporation | Frontier Oil & Gas Co., Inc. | |
| Norcen Energy Resources Ltd. | Union Pacific Resources Group, Inc. | |
| Norcen Explorer, Inc. | Same | |
| Nordan Corporation Ltd. | TIPCO | |
| Norex Drilling, Inc. | Same | |
| Norfitt | American Petrofina Co. of Texas | |
| Norfok Holdings Inc. | UMC Petroleum Corporation | |
| Norman Corporation of Caddo, Inc. | Kinsey Interests | |
| Normandy Oil & Gas Co. | Same | |
| Norris Oil Company | Berry Petroleum Corporation | |
| Nortex Gas & Oil Company | BelNorth Petroleum Corporation | |
| North American Oil Consolidated | Phillips Petroleum Company | |
| North American Royalties, Inc. | Same | |
| North Canadian Oils Ltd. | Same | |
| North Carolina Natural Gas Corp. | Sonat Inc. | |
| North Central Oil Corp. | Pogo Producing Company | |
| North Central Oil Corporation | Pogo Producing Company | |
| North Finn LLC | Same | |
| North Star Resources, Inc. | Same | |
| Northern Fuel Supply Company | Northern Natural Gas Company | |
| Northern Gas and Pipeline Company | Northern Natural Gas Company | |
| Northern Michigan Exploration Company | NOMECO Oil & Gas Company | |
| Northern Natural Gas Company | Dynegy Inc. | |
| Northern Natural Gas Producing Company | Mobil Oil Corporation | |
| Northern Plains Natural Gas Company | ONEOK, Inc. | |
| Northern Plains Oil & Gas Company | Gopher Oil & Gas Company | |
| Northern Plains Railroad Company | Same (Affil: Meridian Oil Inc.) | |
| Northern Reef Exploration Ltd. | Same | |
| Northern Rockies Pipeline Company | Same (Affil: Meridian Oil Inc.) | |
| Northland Operating Company | DevX Energy Inc. | |
| Northrock Resources, Inc. | Same | |
| Northstar Energy Corp. (Calgary) | Same (Subsid: Devon Energy Corp.) | |
| Northwest Energy | Cities Service Oil & Gas Corp. | |
| Northwest Production Company | Same (Affil: Meridian Oil Inc.) | |
| Norwegian Oil Corporation | J.F. Dougherty Company | |
| Novo Oil & Gas | Earthstone Energy | |
| Nu West Development | Same | |
| Nucorp Energy Company, Inc. | Nucorp Energy, Inc. | |
| Nucorp Energy, Inc. | Pin Oak Petroleum, Inc. | |
| Nuevo Denaro Petroleum Company | Fox Production Corporation | |
| Nuevo Energy Company | Plains Exploration and Production Co. | |
| Numac Oil & Gas Ltd. | Same | |
| Nutek Inc. | Same (Lake Forest, CA) | |
| Nutek Oil Inc. | Same (Subsid: Nutek Inc.) | |
| NuVista/PanCanadian | Ovintiv/AEC | |
| Nycal Corp. | Same | |
| O.E.I. Trust, The | Same (Affil: The GHK Company) | |
| O.E.I., L.L.C. | Same (Affil: The GHK Company) | |
| Occidental Oil and Gas Corp. USA | OXY USA, Inc. | |
| Occidental Petroleum Corp. | Same | |
| Occidental Petroleum Ltd. (Canada) | Nexen, Inc. | |
| Ocean Drilling & Exploration | ODECO | |
| Ocean Energy Inc. | Global Natural Resources Corporation | |
| Ocean Energy Resources, Inc. | Devon Energy Corporation | |
| Ocean Energy, Inc. | Devon Energy Corporation | |
| Ocean Oil & Gas | ODECO | |
| Oceanic Oil | Producing Properties, Inc. | |
| Ocelot Energy Inc. | Same (Subsid: Industries Inc.) | |
| Ocelot Oil Company | Enron Oil & Gas Company | |
| Ocotillo | Same | |
| ODECO | Murphy Oil Corporation | |
| Odessa Exploration, Inc. | Key Energy Group, Inc. | |
| Odessa Natural Corporation | Same (Affil: Meridian Oil Inc.) | |
| Odyssey Energy Inc. | Hardy Oil & Gas USA Inc. | |
| Odyssey Oil and Gas Inc. | Hardy Oil & Gas USA Inc. | |
| Offshore Energy Investments, Inc. | Same (Affil: The GHK Company) | |
| Ohio & Plymouth | Marathon Petroleum Company | |
| Ohio Cities Gas Company | Union Oil Company of California | |
| Ohio Oil Company | Marathon Petroleum Company | |
| Oil & Gas Futures | Out of business | |
| Oil & Gas Properties Company | Chevron USA, Inc. | |
| Oil Acquisitions, Inc. | Same | |
| Oil Development Company of Utah | Santa Fe Energy | |
| Oil Investors, Inc. | MCO Resources, Inc. | |
| OKC Limited Partnership | Box Energy Corporation | |
| Oklahoma Acquisition Corp. | Tutamian Production Corporation | |
| Oklahoma Basic Economy Corporation | Same (Subsid: Ascent Energy Inc.) | |
| Oklahoma Natural Gas Company | Same | |
| Oklahoma Oil Company | Tidal Oil Company | |
| Okland Oil Company | Same | |
| Old Ben coal | Sohio Petroleum Company | |
| Old Ocean Oil Company | AMOCO Production Company | |
| Olds Petroleum Corporation | Ladd Petroleum Corporation | |
| Oleum, Inc. | Diamond Shamrock Exploration Co | |
| Oliver Resources, PLC | Dragon Oil, PLC | |
| Olix Industries, Inc. | Adobe Oil and Gas Corp. | |
| Olsen | Jal Oil Company | |
| Olsen & Jal | Texas Pacific Oil Company | |
| Olsen, Fred, Inc. | Volvo Petroleum | |
| Olympia Energy Corp. | Magic Circle Energy Corp. | |
| Olympia Energy Ventures, Ltd. | International Colin Energy Corp. | |
| Olympic Resources, Ltd. | Whittier Energy Corp. | |
| Omega – Smith Energy, Inc. | Smith Energy Associates, Ltd. | |
| Omega Corporation | Omega – Smith Energy, Inc. | |
| Omimex Resources, Inc. | Same | |
| Omni Exploration Inc. | Claim Energy USA | |
| Omni Petroleum Corporation | Same | |
| Omni Power Inc. | Same | |
| Onasco Companies, Inc. | Tengasco, Inc. (Knoxville, TN) | |
| ONEOK Exploration Co. | Same (Subsid: ONEOK Resources Company) | |
| ONEOK Resources Company (Tulsa) | TXOK Acquisition Inc. (transfer of production companies only – not utilities) | |
| ONEOK, Inc. | Same | |
| Onshore Oil Corporation | Lamson Onshore Oil Corporation | |
| Opinac Exploration, Ltd. | Tarragon Oil & Gas, Ltd. | |
| OPUBCO Energy Inc. | Same (Subsid: Oklahoma Publishing Co.) | |
| Ora Oil Company | Smith & Company | |
| Orbit Oil & Gas, Inc. | Sunoma Energy, Inc. | |
| Orion Drillings Funds (various years) | Ocean Energy, Inc. | |
| Orlando Resources Ltd. | Tornado Resources Ltd. | |
| ORRI, Inc. | Same (Affil: The GHK Company) | |
| Oryx Energy Company | Kerr-McGee Corporation | |
| Osage Milestone Petroleum | Same (Affil: Meridian Oil Inc.) | |
| Osca, Inc. (Lafayette) | BJ Services Company | |
| Ottawa Energy, Inc. | Same | |
| Output Exploration, LLC (San Antonio) | TXCO Resources Inc. | |
| Ovintiv USA Inc. | Newfield Exploration Mid Continent Inc. | |
| Owl Petroleum Company | Same | |
| Owl Petroleum Company, Expl. & Prod. | Subsid: Owl Petroleum Company | |
| Oxford Consolidated, Inc. | Same | |
| Oxford Exploration | Oxford Consolidated, Inc. | |
| Oxley Petroleum Co. (Tulsa) | Chesapeake Energy Corporation | |
| Oxley, John C. Oil Producer | Oxley Petroleum Co. | |
| Oxoco Exploration Corp. | American Nat’l Petroleum Co. | |
| Oxoco Oil & Gas, Inc. | American Nat’l Petroleum Co. | |
| Oxoco Production Corp. | American Nat’l Petroleum Co. | |
| Oxoco-Texas, Inc. | American Nat’l Petroleum Co. | |
| Oxoco, Inc. | American Nat’l Petroleum Co. | |
| OXTEX, Inc. | American Nat’l Petroleum Co. | |
| Oxy Petroleum Inc. | Cities Service Oil & Gas Corp. | |
| OXY USA Inc. | Same (Subsid: Occidental Oil and Gas) | |
| P & O Falco, Inc. | Union Texas Petroleum Corp. | |
| P & O Oil Corporation | Same (Affil: Meridian Oil Inc.) | |
| P & P Producing Inc. | Midpar LP | |
| P & P Producing Texas, Inc. | P & P Producing Inc. | |
| P O R Oil & Gas Inc. | Norcen Explorer, Inc. | |
| P.P.M. Investments (USA), Inc. | India Temple Minerals Co. | |
| P’Bell Energy Company | MCNIC Oil & Gas Midcontinent, Inc. | |
| Pacer Development | Pacer Petroleum Inc. | |
| Pacer Petroleum Inc. | Same | |
| Pacific Coast Oil Co. | Chevron | |
| Pacific Energy Investments, Inc. | Devon Energy Corporation | |
| Pacific Energy Partners, LP | Same (Affil: Anschutz) | |
| Pacific Enterprises Oil Company | Hunt Oil Company (See Notes in back) | |
| Pacific Enterprises Royalty Company | Pacific Enterprises Oil Company | |
| Pacific Enterprises, Inc. | Sempra Energy, Inc. | |
| Pacific Gas & Electric Company | Same | |
| Pacific Gas & Electric Supply Company | NGC Energy Company | |
| Pacific Petroleum | Petro-Canada | |
| Pacific Power and Light Co. | Same | |
| Pacific Transmission Supply Company | Pacific Gas & Electric Supply Company | |
| Pacific Union | Texas American Oil Corp. | |
| Pacific Western Oil Corporation | Getty Oil Company | |
| Packaging Research Corporation | Same | |
| Paco Integrated Energy Inc. (Houston) | Same | |
| Paco Oil & Gas Inc. | Paco Integrated Energy Inc. | |
| Pampas Investments, Ltd. | Same (Affil: The GHK Company) | |
| Pan American Petroleum Corp. | Amoco Production Company | |
| Pan Energy Field Services, Inc. | Duke Energy Field Services, Inc. | |
| Pan Ocean | Marathon Petroleum Company | |
| Pan Ocean Energy Corporation Ltd. | Addax Petroleum Corporation | |
| Pan Petroleum MLP | Panaco, Inc. | |
| Panada Resources Corporation | LaTex Resources, Inc. | |
| Pancana Industries, Inc. | Pancana Minerals, Inc. | |
| Pancana Minerals, Inc. | Same | |
| PanCanadian Energy Corp. | EnCana Oil & Gas, Ltd. | |
| Pancanadian Petroleum Company | PanCanadian Energy Corp. | |
| PanEnergy Corporation | Duke Energy, Inc. | |
| Pangaea Petroleum Corp. | Same (Houston) | |
| Panhandle Eastern Corporation | PanEnergy Corporation | |
| Panhandle Oil and Gas, Inc. | Same | |
| Panhandle Oil Corporation | American Petrofina Co. of Texas | |
| Panhandle Royalty Company | Panhandle Oil and Gas, Inc. | |
| Panhandle Western Gas Company | APX Western Corporation | |
| Pantera Energy Corp. | HS Resources, Inc. | |
| Panther Energy Company, LLC | Same (Tulsa) | |
| Paracon Petroleum, Inc. | Cypher Energy Corporation | |
| Paragon Petroleum Corp. | Northrock Resources, Inc. | |
| Paragon Petroleum Ltd. | Paragon Petroleum Corp. | |
| Paramount Petroleum Co. | Same (Affil: Torch Energy Corporation) | |
| Paramount Resources Ltd. | Same (Seattle, Calgary) | |
| Park Avenue Exploration Crop. | PetroCorp, Inc. | |
| Park Oil | Martin Exploration Mgt. Company | |
| Parker & Parsley Development Partners, LP | Parker & Parsley Petroleum Company | |
| Parker & Parsley Petroleum Company | Pioneer Natural Resources USA, Inc. | |
| Parker & Parsley Petroleum Development Corporation | Pioneer Natural Resources Company | |
| Parker and Parsley Development | Pioneer Natural Resources | |
| Parker Drilling Company | Same | |
| Parker Energy Resources, Inc. | Same | |
| Parker Industries, Inc. | Same (Subsid: Homco International, Inc.) | |
| Parker Oil and Gas Company | Ladd Petroleum Corp. | |
| Parker Petroleum Corp. | Western Oil Fields, Inc. | |
| Parragon Petroleum, Inc. | South Hampton Mineral Corp. | |
| Parsley Energy | ExxonMobil | |
| Parson Oil LLC | Same | |
| Parson, Elmer S., Jr. | Parson Oil LLC | |
| Partners Oil Company | Cedyco Corporation | |
| Pasco, Inc. | Little America Refining Co. | |
| Pasotex Petroleum | The California Company | |
| Pathfinder Petroleum Corp. | Energy Investments | |
| Patina Oil & Gas Corporation | Noble Energy Inc. | |
| Patrick Petroleum Company | Goodrich Petroleum, Inc. | |
| Patterson Energy, Inc. (Snyder, TX) | Same | |
| Paul Revere Management Corp. | Same | |
| Pauley Petroleum, Inc. | Hondo Oil & Gas Co. (New 1989 not ARCO) | |
| Pax Petroleum, Inc. | Petrodynamics, Inc. | |
| PCTC – Oregon, Inc. | Same (Affil: Meridian Oil Inc.) | |
| PCTC – Skykomish, Inc. | Same (Affil: Meridian Oil Inc.) | |
| PCTC, Inc. | Same (Affil: Meridian Oil Inc.) | |
| PDC Energy, Inc. | Chevron | |
| Peak Energy Resources, Inc. | XTO Energy, Inc. | |
| Peake Energy, Inc. | Beldon & Blake Corporation | |
| Peake Operating Company | Beldon & Blake Corporation | |
| Pease Oil and Gas Company | Republic Resources, Inc. (Grand Junction, CO) | |
| Pecos Company | Same (Affil: Meridian Oil Inc.) | |
| Pecos Exploration Company | ALCO Oil & Gas Corporation | |
| Pecos Production Company | Chesapeake Energy Corporation | |
| PEDCO Resources Company | Same | |
| Peerless Oil & Gas Company | Fluor Oil and Gas Corporation | |
| Peerless Oil Producing Company | Peerless Oil & Gas Company | |
| PEI of Texas | Mesa, Inc. | |
| Peltex | McMoran Oil & Gas Company | |
| Pelto Oil Company | Southdwon, Inc. | |
| PEMC U.S., Inc. | Devon Energy Corporation | |
| PEMC, Inc. | Devon Energy Corporation | |
| Penaco, Inc. | Same | |
| Penn Central | Same | |
| Penn West (Denver, Calgary) | Same | |
| Penn West Energy Trust | Penn West | |
| Penn-Virginia Resources Corp. | Same | |
| Pennaco Corporation | Out of Business (Liquidated in Bankruptcy) | |
| Pennaco Drilling, Inc. | Out of Business (Liquidated in Bankruptcy) | |
| Pennaco Energy, Inc. | Same (Subsid: Marathon Oil Company) | |
| Pennaco Oil Company, Inc. | Out of Business (Liquidated in Bankruptcy) | |
| Pennaco Oil Corporation | Out of Business (Liquidated in Bankruptcy) | |
| Pennant Leasing, Inc. | Devon Energy Corp. | |
| Pennetex Petroleum Company | Tidewater Oil Company | |
| Pennsylvania Castle Energy Corp. | Same | |
| Pennsylvania Refining Company | Penreco, Inc. | |
| Penntex Petroleum & Land Co. | Tidewater Oil Company | |
| PennzEnergy | Devon Energy | |
| PennzEnergy Company | Devon Energy Corporation | |
| PennzEnergy Exploration & Production, LLC | Devon Energy Corporation | |
| Pennzoil Company | Pennzoil-Quaker State Company | |
| Pennzoil Exploration & Production Co. | Pennzoil Company | |
| Pennzoil United | Pennzoil Company | |
| Pennzoil-Quaker State | Shell | |
| Pennzoil-Quaker State Company | Shell Oil Company | |
| Penreco, Inc. | Same (Subsid: Pennzoil Company) | |
| Penrose Production Company | Sohio Petroleum Company | |
| Penrose, N.G., Inc. | Sohio Petroleum Company | |
| Peoples Energy Corp. | Same (Chicago) | |
| Peoples Energy Production Company | El Paso Exploration and Production Company | |
| Peoples Natural Gas Company | Sun Oil Line Company | |
| Peplin Oil Company (Stillwater, OK) | Crown Partners, LLC | |
| Peppers Refining Company | Champlin Refining Company | |
| Perfection Inspection Company | Dyco Petroleum Corporation | |
| Permian Basin Pipeline Company | Northern Natural Gas Company | |
| Permian Basin Trust | Same (Affil: Meridian Oil Inc.) | |
| Permian Corporation | Scurlock Permian Corp. (Subsid: Ashland Oil Inc.) | |
| Permian Oil | Permian Corporation | |
| Permian Resources Co. | Same (Subsid: Chesapeake Energy Corp) | |
| Perry Energy Corp., Inc. | Parker Energy Resources, Inc. | |
| Petco (Petroleum Corp. of Texas) | Breck Operating Corporation | |
| Petco, Inc. | Same | |
| Petro Well Services Inc. | CenAlta Energy Services Inc. | |
| Petro-Canada | Suncor Energy Inc. | |
| Petro-Energy Exploration Inc. | Faulkner Corp. | |
| Petro-Lewis Corp. | Same | |
| Petro-Lewis of Lear Petroleum | Same | |
| Petro-Lewis/RKI | Am. Pac./WPX | |
| Petrocarbons, Inc. | Columbia Petroleum Corporation | |
| PetroCorp | PetroCorp, Inc. | |
| PetroCorp, Inc. | Unit Corporation | |
| Petrodel Exploration, Inc. | Petrofina Delaware, Inc. | |
| Petrodynamics, Inc. | Citrus County Land Bureau, Inc. | |
| Petrodyne Industries, Inc. | Petrodynamics, Inc. | |
| Petrofina Canada | Petro-Canada | |
| Petrofina Delaware, Inc. | American Petrofina, Inc. | |
| Petrofina Exploration, Inc. | American Petrofina, Inc. | |
| Petrofina, SA (Belgium) | Total, SA | |
| Petroglyph Energy Inc. | Same (Hutchison, KS) | |
| Petrohawk Energy Corporation | Same (Houston) | |
| Petrohawk Operating Company | Same (Subsid: Petrohawk Energy Corp.) | |
| Petroleum Corp. of Delaware, The | Same (Subsid: Presidio Oil Company) | |
| Petroleum Corporation of Texas | Petco, Inc. | |
| Petroleum Development Corporation | Same (Bridgeport, W. VA) | |
| Petroleum Exploration and Technology, Inc. | Same (Los Angeles) (Subsid: Daugherty Resources, Inc.) | |
| Petroleum Inc. | Same (Tulsa) | |
| Petroleum Int’l Associates, Inc. | Hydro Carbon Trading-Transport | |
| Petroleum Investments, Ltd. | Bradmar Petroleum Corporation | |
| Petroleum Reserve Corp. | Castle Energy Corp. | |
| Petrolith Inc. | Unibar Energy Services Inc. | |
| Petromark Merger Company | Petromark Resources Company | |
| Petromark Resources Company | PEDCO Resources Company | |
| PetroQuest Resources, Inc. | Same (Arlington, TX) | |
| Petroro Corporation | Captiva Resources, Inc. | |
| PetroSearch Energy Corp (Houston) | Double Eagle Petroleum Co. | |
| Petrosearch Energy Corp. (Houston) | Same (Subsid: Double Eagle Petroleum Co.) | |
| Petrotech Energy Group, Inc. | Same | |
| Petrotide Ltd. | Posse Energy Ltd. | |
| Petrotiger II Ltd. | Posse Energy Ltd. | |
| PETX Petroleum corp. | Anchor Bay Corp. | |
| Pexamin Pacific, Inc. | Independent Exploration Company | |
| PG&E Enterprises | Same (Subsid: Pacific Gas and Electric Company) | |
| PG&E Gas Supply Company | NGC Energy Company | |
| PG&E Resources Company | Same (Subsid: Pacific Gas and Electric Company) | |
| Phibro Energy, Inc. | Basis Petroleum, Inc. | |
| Philbro Oil & Gas Corp. | IDC Energy Corp. | |
| Phillips Oil Company | Phillips Petroleum Company | |
| Phillips Petroleum Company | ConocoPhillips | |
| Phoenix Energy Company | Same | |
| Phoenix Operating Company | Same | |
| Phoenix Resources Co. | TIPCO | |
| Phoenix Resources Companies, Inc. | Same (Subsid: Apache Corporation) | |
| Piaga, Inc. | Mesa, Inc. | |
| Piedmont Petroleum Corp. | Southwestern Production Corp. | |
| Pilgrim Exploration | American Energy Exploration Co. | |
| Pin Oak Petroleum, Inc. | Same | |
| Pincher Creek Ranch | Same (Affil: Meridian Oil Inc.) | |
| Piñon Midstream | Enterprise Products Partners | |
| Pinto, Joseph | Same | |
| Pioneer Coal company | Mesa Petroleum Company | |
| Pioneer Corporation | Mesa Petroleum Company | |
| Pioneer Houston, Inc. | Mesa Petroleum Company | |
| Pioneer Natural Resources | ExxonMobil | |
| Pioneer Natural Resources Co. | Same (Dallas) | |
| Pioneer Natural Resources USA, Inc. | Same (Dallas) | |
| Pioneer Nuclear, Inc. | Mesa Petroleum Company | |
| Pioneer Production Corp. | Mesa Petroleum Company | |
| Pittencrieff America, Inc. | Same (Abilene) | |
| Place Resources Corp. | Star Oil & Gas Acquisitions, Ltd. | |
| Placid Oil Company | Same | |
| Plains Exploration & Production Co. | Same (Subsid: Plains Resources, Inc.) | |
| Plains Petroleum Company | Barrett Resources Corp. | |
| Plains Resources, Inc. | Same (Houston) (Subsid: Vulcan Capital) | |
| Plano Petroleum Corp. | Trousil and Associates Inc. | |
| Platinum Energy Resources, Inc. | Same | |
| Platt Energy Corp. | United States Borax & Chemical Corp. | |
| Playa Minerals & Energy Inc. | Vulcan Minerals & Energy Inc. | |
| Pleasant Valley Energy Company | Same (Subsid: Tri-Valley Corporation) | |
| Plotner Oil and Gas Company | Silverridge Corp. | |
| Plum Creek Timber Company | Same (Affil: Meridian Oil Inc.) | |
| Plymouth Oil Company | Ohio Oil Company | |
| Poco Petroleum Ltd. (Calgary) | Burlington Resources Corp. | |
| Pogo Producing Company | Plains Exploration and Production Company | |
| Pomaikai Oil Corporation | Devon Energy Corporation | |
| Pontotoc Production Company Inc. | Same (Subsid: Ascent Energy Inc.) | |
| Ports of Call Oil Company | Champion Reserve Corporation | |
| Posse Energy Ltd. | Same | |
| Posse Petroleum Ltd. | Posse Energy Ltd. | |
| Potts Stephenson Exploration Co., Inc. | ONEOK Resources Company | |
| PPC Anadarko, In. | Harken Exploration Company | |
| PPC Oil & Gas Corp. | Paragon Petroleum Corp. | |
| PPPCO Oil Oil Co. Ltd. | Posse Energy Ltd. | |
| Prairie Oil Company | Prairie Sinclair Oil Company | |
| Prairie Producing Company | Same (Subsid: Placer Development, Ltd.) | |
| Prairie Sinclair Oil Company | Sinclair Oil & Refining Corp. | |
| Prairie State Energy Company | Same | |
| Premcor Refining Corp. | Valero Energy Corporation | |
| Premier Operating Company | Imperial Petroleum, Inc. | |
| Premier Resources Ltd. | Northern Reef Exploration Ltd. | |
| Presco Western LLC | Same (Subsid: Ellora Oil & Gas Inc.) | |
| Presidio Exploration, Inc. | (Subsid: Presidio Oil Company) | |
| Presidio Oil Company | Tom Brown, Inc. | |
| Presidio Operating Company | Captain, Inc. | |
| PREVIOUS NAME | CURRENT NAME | |
| Primary Fuels, Inc. | Same | |
| Prime Natural Resources Inc. | Same (Houston) | |
| Prime-X Oil and Gas, LLC | Prime Natural Resources Inc. | |
| PrimeEnergy Corporation | Same | |
| PrimeEnergy Management Corp. | Same (Subsid: PrimeEnergy Corporation) | |
| Princeton Natural Gas Company | Chesapeake Energy Marketing, Inc. | |
| Prize Energy Corp. | Magnum Hunter Resources, Inc. | |
| Producers Oil, Inc. | Texaco USA, Inc. | |
| Producers Royalty Corp. | Texas American Oil Corp. | |
| Producing Properties, Inc. | Reserve Oil and Gas Company | |
| Profile Capital Corp. | Abacan Resource Corp. | |
| Progress | Rycade | |
| Progress Energy, Inc. | Same (Raleigh, NC) | |
| Progress Fuel Corp. | Same (Subsid: Progress Energy, Inc.) | |
| Promax Energy Inc. | American Promax Inc. | |
| Prospect Company, The | Subsid: The Travellers Ins. Co. | |
| Providence Energy Corp. | Southern Union Company | |
| Providence Oil & Gas Corp. | Same | |
| Prudential Minerals Exploration | Del Mar | |
| PSEC, Inc. | ONEOK Resources Company | |
| PSI Energy Inc. (Indiana) | Duke Energy, Inc. | |
| PSPC Ltd. | ONEOK Resources Company | |
| Pubco Petroleum Corporation | Mesa Petroleum Company | |
| Public Service Company of Oklahoma | PSO | |
| Public Utility Corporation of Arkansas | ARKLA, Inc. | |
| Puma Energy Inc. | Same (Dallas) | |
| Pure Energy Resources Inc. | Same (Midland) (Affil: Uncoal Corp.) | |
| Pure Oil Company | Union Oil Co. of California | |
| Putnam Venture, Ltd. | Exploration Associates, LLC | |
| PYR Energy Corp. | Samson Investment Company | |
| Pyramid Oil Corporation | Same | |
| Pyramid Petroleum, Inc. | Same (Houston) | |
| Pyro Energy Corp. | Exex Resources | |
| QEP Resources | Diamondback Energy | |
| Quaker State Oil Company | Shell Oil Company | |
| Quanah Petroleum, Inc. | Marline Petroleum Corporation | |
| Quarles Drilling Corporation | Integrated Drilling & Exploration, Inc. | |
| Quasar Tech, Inc. | McGowen Resources Co. | |
| Quay Valley Inc. | Same | |
| Que West Resource, Inc. | Ottawa Energy, Inc. | |
| Quebec Affiliates (North America), Ltd. | Razor Oil Company | |
| Queen Sand Resources Inc. | DevX Energy Inc. | |
| Queensland Gas Company (QGC) | Shell | |
| Quesota Oil & Gas | Same | |
| Questa Oil & Gas Company | Same (Subsid: Unit Corporation) | |
| Questar Corp. | Same | |
| Questar Energy Company | Same (Subsid: Questar Corp.) | |
| Questar Exploration and Production Company | Same (Subsid: Questar Corp.) | |
| Quinoco Energy Inc. | Saxon Oil Development Partners | |
| Quinoco Oil Corp. | Saxon Oil Development Partners | |
| Quinoco Resources, Inc. | Saxon Oil Development Partners | |
| Quintana Petroleum, Inc. | Hallwood Petroleum, Inc. | |
| Rainbow Resources, Inc. | Williams Companies, The | |
| RAM Energy Resources, Inc. | Same (Tulsa) | |
| Ram Energy, Inc. | Same | |
| Ram Oil & Gas LLC (Dallas) | Tridimension Energy LLC | |
| Ram Operating, Inc. | Ram Energy, Inc. | |
| Ramco Corporation | Same (Affil: The GHK Company) | |
| Ramco Inc. | Ram Energy, Inc. | |
| Ramco-NYL-1987 Limited Partnership | Ram Energy, Inc. | |
| Ranch Oil Company | Ranch Royalty Company | |
| Ranch Royalty Company | Same | |
| Range Resources Corp. | Same (Ft. Worth) | |
| Rankin Oil Company | Hydrogen Energy Corporation | |
| RATEX Resources Incorporated | Same | |
| Ratliff Exploration Company | TXO Production Corp. | |
| Rattler Midstream | Diamondback Energy | |
| Ray Resources Corporation | Flying Diamond Oil Corp. | |
| Razor Oil Company | Same | |
| RB Operating, Inc. | Ram Energy, Inc. | |
| RDC, Inc. | Same (Subsid: Miramar Resources, Inc.) | |
| Reading & Bates Production Co. | Ram Energy, Inc. | |
| Rebel Exploration, Inc. | Same | |
| Red Eagle Resources Corp. | Lomak Petroleum, Inc. | |
| Red River Energy Inc. (Tulsa) | Beta Oil & Gas Inc. | |
| Red Rock Ranch | Same (Affil: The GHK Company) | |
| Redco Corporation | Arapaho Petroleum, Inc. | |
| Redfern Development Corp. | Flag Oil Corp. | |
| Redfern Oil Company | Flag Oil Corp. | |
| Redfern, Peter F. & Sons, Co. | Flag Oil Corp. | |
| Redwind Company | Same (Affil: The GHK Company) | |
| Redwind Trust A, B & C | Same (Affil: The GHK Company) | |
| Redwood Energy (USA) Ltd. | Same | |
| Regal Oil Company | Aminoil USA, Inc. | |
| Regency Exploration, Inc. | Oxford Consolidated, Inc. | |
| Reichhold Energy | Atlantic Richfield Company | |
| Reily Oil | Martin Exploration Mgt. Company | |
| Reiter-Foster | Same | |
| Remington Oil & Gas Corp. | Cal Dive International Inc. | |
| Reno Natural Gas Company | Tenneco Oil Company | |
| Reno Oil Company | Tenneco Oil Company | |
| Repello Oil Company | Sinclair Oil and Gas Company | |
| Republic Natural Gas Company | Mobil Oil Corporation | |
| Republic Resources, Inc. | Same (Grand Junction, CO) | |
| Reserve Natural Gas Company | ARKLA, Inc. | |
| Reserve Oil and Gas Company | Getty Oil Company | |
| Reserve Oil, Inc. | Getty Reserve Oil Inc. | |
| Reserve Petroleum Company | Getty Reserve Oil Inc. | |
| Resource America, Inc. | Same | |
| Resource Exploration, Inc. | Resource America, Inc. | |
| Resource Partners | Mission Resource Partners, L.P. | |
| Resource Services Corp. | Integrated Drilling & Exploration, Inc. | |
| Reunion Energy Company | Same (Subsid: Reunion Resources Company) | |
| Reunion Resources Company | Same | |
| Rialto Energy Inc. | Same (Affil: Torch Energy Corporation) | |
| Riata Energy Inc. (Amarillo) | SandRidge Energy, Inc. | |
| Richardson-Bass | Bass Producing | |
| Richfield Oil Company | Atlantic Richfield Company | |
| Richfield Oil Company of California | Richfield Oil Company | |
| Richfield Oil Corporation | BP | |
| Richland Resources Corp. | Same (Oklahoma City) | |
| Ricks Exploration, Inc. | Same (Subsid: Concho Oil & Gas Corp.) | |
| Ridgeway Arizona Oil Corporation | Same (Subsid: Enhanced Oil Resources, Inc.) | |
| Ridgeway Petroleum Corporation | Enchanced Oil Resoyrces, Inc. | |
| Rigel Energy Corp. | Same | |
| Rine Drilling and Exploration, Inc. | Todd, C.H., Inc. | |
| Rio Grande Oil Company | Atlantic Richfield Company | |
| Rio Nevada Energy, Inc. | Can West Exploration, Inc. | |
| RKI Exploration & Production | Devon Energy | |
| RMR, Inc. | Texaco USA, Inc. | |
| Ro-Pen Royalty | Young, Marshall R. | |
| Roadrunner Energy, Inc. | Brustan Petroleum Corp. | |
| Robertson, Corbin J. | Same (Operates: Quintana Pet.) | |
| Rock Hill Oil Company | Getty Oil Company | |
| Rock Island Oil & Refining Co., Inc. | Koch Industries, Inc. | |
| Rocksource ASA | Same (Oslo, Norway / Houston) | |
| Rocksource Energy Corporation | Same (Subsid: Rocksource ASA) – Houston | |
| Rockwell Drilling Company | RDC, Inc. | |
| Roden Oil Company | Houston Natural Gas Corp. | |
| Rodman Petroleum Corporation | Same | |
| Rodman-Noel | Rodman Petroleum Corporation | |
| Roeser and Pendleton | Young, Marshall R. | |
| Root Petroleum Corporation | AMOCO Production Company | |
| Rosetta Resources | Chevron | |
| Rosewood Resources, Inc. | Same | |
| Ross Production Company | Nerox Energy Corporation | |
| Rowan Oil & Drilling Company | Texas Pacific Oil Company | |
| Roxana Oil Company | Shell Oil Company, Inc. | |
| Roxana Petroleum | Shell | |
| Roxana Petroleum Company | Shell Oil Company | |
| Roxana Resources, Ltd. | Same | |
| Royal Dutch Petroleum Co. | Shell | |
| Royal Producing Company | DEKALB Energy Company | |
| Royalties Management Company | Houston Royalty Company | |
| RSP Permian, Inc. | ConocoPhillips | |
| RTZ Corp. | Same | |
| Rubicon Company, LP | Same (Affil: Torch Energy Corporation) | |
| Rubicon Oil and Gas LLC | Same (Midland) | |
| Rust Oil Corporation | Same | |
| RVO Petroleum Co. | Getty Reserve Oil, Inc. | |
| Rycade | Same | |
| Saba Petroleum Corp. | Greka Energy Corp. | |
| Sabacol Inc. | Same (Subsid: Greka Energy Corp.) | |
| Sabine Corporation | Pacific Enterprises Royalty Company | |
| Sabine Production Company | Sabine Corporation | |
| Sabine Royalty Corporation | Sabine Corporation | |
| Sabine/Santa Fe | Pac. Ent./Devon | |
| Salamander Energy PLC | Same (London) | |
| Salamon Inc. | Same | |
| Salt Lake Refining Company | California Company, The | |
| Saltmount Oil Company | Midwest Oil Corporation | |
| Saltmount-Midwest Oil Company | Amoco Production Company | |
| Samedan Oil Corporation | Same (Subsid: Noble Affiliates Inc.) | |
| Samson International Company | Same | |
| Samson Investment Company | Same (Affil: Samson Resources Corporation) | |
| Samson Natural Gas Company | SNG Production Company | |
| Samson Natural Resources Corporation | Same (Subsid: Samson International Company) | |
| Samson Resources Corporation | Samson International Company | |
| Samsung Oil & Gas USA Corp. | Same (Subsid: Samsung of S. Korea) | |
| San Diego Gas & Electric, Inc. | Same (Subsid: Sempra Energy, Inc.) | |
| San Jacinto | Exxon Company USA | |
| Sandefer Oil & Gas, Inc. | Sandefer Oil Company | |
| Sandefer Oil Company | Same | |
| Sandhawk Energy, LLC | Rocksource Energy Corp. | |
| SandRidge Energy, Inc. | Same (Oklahoma City, OK) | |
| SandRidge Midstream, Inc. | Same (Subsid: SandRidge Energy, Inc.) | |
| SandRidge Tertiary, LLC | Same (Subsid: SandRidge Energy, Inc.) | |
| Sanguine, LTD. | Same | |
| Santa Fe Andover Oil Company | Santa Fe Minerals, Inc. | |
| Santa Fe Braun Inc. | Same | |
| Santa Fe Energy Company | Santa Fe Energy Resources, Inc. | |
| Santa Fe Energy Partners LP | Santa Fe Energy Resources, Inc. | |
| Santa Fe Energy Resources, Inc. | Santa Fe Snyder Corp. | |
| Santa Fe Industries | Same | |
| Santa Fe International Company | Same | |
| Santa Fe International Corporation | Santa Fe International Company | |
| Santa Fe Minerals, Inc. | Same | |
| Santa Fe Pacific Corp. | Same | |
| Santa Fe Snyder Corp. | Devon Energy Corp. | |
| Santa Fe Snyder Corporation | Devon Energy | |
| Santa Fe Southern Pacific Corp. | Santa Fe Pacific Corp. | |
| Santiago | Texas American Oil Corp. | |
| Santo Resources, Inc. | Chesapeake Mid-Continent Corp. | |
| Santos Americas and Europe Corporation | Same (Subsid: Santos, Ltd.) (Houston) | |
| Santos Ltd. | Same | |
| Santos USA Corp. | Same (Subsid: Santos, Ltd.) (Houston) | |
| SAP Acquisition, LLC | Same (Subsid: Chesapeake Energy Corp.) | |
| Sapient Energy Corp. (Tulsa) | Chesapeake Energy Corporation | |
| Sara Oil & Gas, Inc. | Same (Oklahoma City) | |
| Saratoga Resources, Inc. | PrimeEnergy Corporation | |
| Sarkeys | Sabine Production Company | |
| Savoy Exploration, Inc. (Michigan) | Same | |
| Savoy Oil & Gas, Inc. | Savoy Exploration, Inc. | |
| Saxon Oil Company | Hallwood Energy Corporation | |
| Saxon Oil Development Partners | Hallwood Energy Partners, L.P. | |
| Saxony Corporation | Same (Affil: Meridian Oil Inc.) | |
| Scana Corp. | Same | |
| Scana Petroleum Resources, Inc. | Same (Subsid: Scana Corp.) | |
| Schermerhorn | Anderson-Prichard Oil Company | |
| Schlacter, David A. | Same | |
| Schraeder Oil Company | Phillips Petroleum Company | |
| Schroeder Oil and Gas Corp. | High Plains Oil Corporation | |
| Scissor Tail Energy LLC | Copano Energy LLC | |
| Scope, Inc. | Same | |
| Scurlock Oil Company | Same (Subsid: Ashland Oil Inc.) | |
| Scurlock Permian Corp. | Same (Subsid: Ashland Oil Inc.) | |
| Seaboard Oil & Gas Company | Texaco-Seaboard, Inc. | |
| Seaboard Oil Company | Same | |
| Seafeld Resources | Same (Affil: Torch Energy Corporation) | |
| Seagull Energy Corporation | Devon Energy | |
| Seagull Energy Corporation (Houston) | Ocean Energy, Inc. | |
| Seahawk Capital Corporation | Same | |
| Seahawk Oil International | Seahawk Capital Corporation | |
| Seal Petroleum Corporation | Comex Marine Service | |
| Search Drilling | Providence Oil & Gas Corp. | |
| Search Exploration and Dev. Co. | Same | |
| Seaside Oil Company | Phillips Petroleum Company | |
| Secom General Corp. | Same | |
| Seitel Inc. | Same (Houston) | |
| SemGroup | Energy Transfer | |
| Seminole Pipeline Company | Enterprise Products Partners, L.P. | |
| Sempra Energy International, Inc. | Same (Subsid: Sempra Energy, Inc.) | |
| Sempra Energy Resources, Inc | Same (Subsid: Sempra Energy, Inc.) | |
| Sempra Energy Solutions, Inc. | Same (Subsid: Sempra Energy, Inc.) | |
| Sempra Energy Trading Company | Same (Subsid: Sempra Energy, Inc.) | |
| Sempra Energy Utility Ventures, Inc. | Same (Subsid: Sempra Energy, Inc.) | |
| Sempra Energy, Inc. (San Diego, CA) | Same | |
| Seneca Oil Company | Same (Subsid: Kaiser-Francis Oil Company) | |
| Seneca Resources Corp. | Same | |
| Seven Seas Petroleum, Inc. | Same | |
| SEW Oil Corporation | American Petrofina, Inc. | |
| SGO Petroleum Inc. | BRG Petroleum, Inc. | |
| Shaffer Oil & Refining Company | Deep Rock Oil Corp. | |
| Shamrock Oil & Gas Corp. | Diamond Shamrock Corp. | |
| Shamrock Pipeline Corp. | Diamond Shamrock Exploration Co. | |
| Shawnee Oil and Gas | Devon Energy Corp. | |
| Shell Continental Companies | Same | |
| Shell Oil Company | Shell | |
| Shell Oil Company, Inc. | Same (Subsid: Royal Dutch/Shell) | |
| Shell Petroleum Company, Inc. | Shell Oil Company, Inc. | |
| Shell Petroleum Corp. | Shell Oil Company, Inc. | |
| Shell Western E & P Inc. | Shell Continental Companies | |
| Shell Western Expl. & Prod., Inc. | SWEPI | |
| Shenandoah Oil Corporation | Mesa, Inc. | |
| Sheridan California Energy Inc. | Same (Affil: Sheridan Energy, Inc.) | |
| Sheridan Energy, Inc. | Same (Houston) (Subsid: Calpine Corp.) | |
| Shield Oil Company | Amoco Production Company | |
| Shore Oil | Same (Affil: Torch Energy Corporation) | |
| Shoreline Petroleum Corporation | Producing Properties, Inc. | |
| Siebens Oil & Gas | Dome Petroleum Corp. | |
| Siebens Oil & Gas Company | Texaco USA, Inc. | |
| Signal Company | Signal Oil and Gas Company | |
| Signal Oil and Gas Company | Burmah Oil and Gas Company | |
| Silver Eagle Resources, Ltd. | Ocean Energy, Inc. | |
| Silverback Exploration | Centennial Resource Development | |
| SilverBow Resources | Crescent Energy Co. | |
| Silverridge Corp. | Same | |
| Simba Energy Corp. | Same | |
| Sinclair Consolidated Oil Corp. | Sinclair Oil Corporation | |
| Sinclair Gulf Corp. | Sinclair Consolidated Oil Corp. | |
| Sinclair Oil & Gas Company | Sinclair Refining Company | |
| Sinclair Oil & Refining Corp. | Sinclair Oil Corporation | |
| Sinclair Oil and Gas Company | Sinclair Oil Corporation | |
| Sinclair Oil Corporation | Atlantic Richfield Company | |
| Sinclair Refining Co | Sinclair Oil Corporation | |
| Sinclair, William D., Inc. dba Sinclair Oil Properties | Bearcat Land, Inc. (Oklahoma City) | |
| Sipco, Inc. | Chevron USA, Inc. | |
| Skaer Enterprises, Inc. | Willard Pease Oil & Gas Co. | |
| Skelly Oil Company | Getty Oil Company | |
| Skyhawk Energy Affiliates, Inc. | Cutlass Corporation | |
| SKZ, Inc. | Zilkha Energy Company | |
| SLAPCO (South Louisiana Prod. Co) | Celeron Oil and Gas Company | |
| Slick Oil Company, The | Slick-Urschel Oil Company | |
| Slick-Moorman Trustees | Same | |
| Slick-Urschel Oil Company | Slick-Moorman Trustees | |
| Sloan Acquisition Corp. | BayCorp Holdings Ltd. | |
| Sloan Group, Ltd. | Same (NH) | |
| Smart Exploration, Inc. | Cannon Energy, Inc. | |
| Smith & Company | Same | |
| Smith Development Corporation | Petrodynamics, Inc. | |
| Smith Energy Associates, Ltd. | Same | |
| SMR Energy Income Funds | Same | |
| SMR Natural Gas Ventures, Inc. (Houston) | Same (Subsid: SMR Energy Income Funds) | |
| SMR Property Management, Inc. | SMR Natural Gas Ventures, Inc. | |
| SND Energy Company, Inc. | Petrotech Energy Group, Inc. | |
| SNG Production Company | Same (Affil: Samson Resources Corporation) | |
| Snyder Oil Corporation | Santa Fe Snyder Corp. | |
| Snyder Operating Partnership, L.P. | Snyder Oil Corporation | |
| Socony | Mobil Oil Corporation | |
| Socony Mobil Oil Company, Inc. | Mobil Oil Corporation | |
| Socony Vacuum Oil Company | Mobil Oil Corporation | |
| Socony-Vacuum | ExxonMobil | |
| Sohio Petroleum Company | Standard Oil Production Company | |
| Solarex | Amoco Production Company | |
| Sonat Exploration Company | Same (Subsid: Sonat, Inc.) | |
| Sonat Minerals, Inc. | Sonat, Inc. | |
| Sonat, Inc. | El Paso Energy, Inc. | |
| Sonora Acquisitions Corp. | Same (Subsid: American Exploration Company) | |
| Sooner Testing Inc. | Cudd Pressure Control | |
| Soquip | Same | |
| Sotex | Chevron USA, Inc. | |
| Sourgasco, Inc. | Conquest Exploration Company | |
| South California Petroleum Company | Scope, Inc. | |
| South Hampton Mineral Corp. | Same | |
| South Louisiana Production Co. (SLAPCO) | Celeron Oil and Gas Company | |
| South States Oil & Gas Company | Same (Subsid: American Exploration Company) | |
| South Texas Development Company | Sabine Royalty Corporation | |
| Southdown, Inc. | Same | |
| Southeastern Exploration Company | Enron Oil & Gas Company | |
| Southern California Gas Company | Same (Subsid: Sempra Energy, Inc.) | |
| Southern Cities Distributing Company | Arkansas Louisiana Gas Company | |
| Southern Crude Oil Purchasing Company | Stanolind Oil and Gas Company | |
| Southern Energy Resources | Crown Zellerbach Corp. | |
| Southern Mineral Corp. | PetroCorp, Inc. | |
| Southern Mineral Gas | Sonat, Inc. | |
| Southern Minerals | Sun Expl. & Prod. Company | |
| Southern Natural Resources Company | Sonat, Inc. | |
| Southern Petroleum Company | Sabine Production Company | |
| Southern Petroleum Exploration | Wiser Oil Company | |
| Southern Producing Company | Sinclair Oil Company | |
| Southern Production & Refining Company | Sonat, Inc. | |
| Southern Production Company | Atlantic Richfield Company | |
| Southern Union Company | Same (Austin) | |
| Southern Union Production Company | Supron Energy Corporation | |
| Southland Corporation | Same | |
| Southland Royalty Company | Meridian Oil, Inc. | |
| Southmark Corp. (MGF Assets) | Kaiser-Francis Oil Company | |
| Southwest Combination Income Drilling Program 1988 LP | Southwest Royalties Inc. | |
| Southwest Development Drilling Fund 91 A LP | Southwest Royalties Inc. | |
| Southwest Developmental Drilling Fund 1990 LP | Southwest Royalties Inc. | |
| Southwest Gas | Sonat, Inc. | |
| Southwest Gas Corp. | Same | |
| Southwest Gas Producing Company, Inc. | Devon Corporation | |
| Southwest Natural Production Company | ARKLA Exploration Company | |
| Southwest Oil and Gas Income Fund VIII A LP | Southwest Royalties Inc. | |
| Southwest Oil and Gas Income Fund X A LP | Southwest Royalties Inc. | |
| Southwest Oil and Gas Income Fund X B LP | Southwest Royalties Inc. | |
| Southwest Oil and Gas Income Fund X C LP | Southwest Royalties Inc. | |
| Southwest Oil and Gas Income Fund XI A LP | Southwest Royalties Inc. | |
| Southwest Royalties Inc. | Same | |
| Southwest Royalties Income Fund V LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund IX B LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund VII B LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund X A LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund X B LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund XI A LP | Southwest Royalties Inc. | |
| Southwest Royalties Institutional Income Fund XI B LP | Southwest Royalties Inc. | |
| Southwestern Energy | Expand Energy (Chesapeake) | |
| Southwestern Gas Pipeline, Inc. | Same (Subsid: Devon Energy Corp) | |
| Southwestern Investments, Ltd. | Same (Affil: The GHK Company) | |
| Southwestern Production Corp. | Same | |
| Southwestern Refining Company, Inc. | Kerr-McGee | |
| Southwood Oil Company | Munance Corp. | |
| Sovereign Exploration Company | Bonanza Petroleum, Inc. | |
| Sparkman Production Company | Arch Petroleum Corp. | |
| Spectra Energy Corp. | Same (Subsid: Duke Energy Corp.) | |
| Spectrum 7 Energy Corporation | Harken Oil & Gas, Inc. | |
| Spectrum Gas Systems | Div. Of Hutton Oil & Gas | |
| Spectrum Oil and Gas Company | MCO Resources Spectrum Corp. | |
| Spike Box Land & Cattle Company Inc. | Same | |
| Spindletop Oil & Gas, Inc. | Prairie State Energy Company | |
| Spinnaker Exploration Company | Same (Houston) (Subsid: Norsk Hydro ASA) (*Dorchester Minerals Oklahoma Et al.) | |
| Spire International Corp. | Same | |
| Spirit Energy 76 | Same (Subsid: Unocal Corporation) | |
| SPR Energy Corporation | Ocean Energy, Inc. | |
| Spraberry Development Corp. | Midpar, LP | |
| Spring Holdings Inc. | Cross Timbers Oil Company | |
| Spring Resources, Inc. | Cross Timbers Oil Company | |
| Spurlock & Spines Exploration, Inc. | Hugoton Energy Corporation | |
| SRW, Inc. | Secom General Corp. | |
| ST. Joe Minerals | Primary Fuels | |
| St. Mary Energy Company | Same (Subsid: St. Mary Land & Exploration) | |
| St. Mary Land & Exploration Co. | Same (Denver) | |
| St. Mary Parish Land Company | St. Mary Land & Exploration Co. | |
| Stakeholder Midstream | Targa Resources | |
| Stalwart Energy Company | Lumen Energy, Inc. | |
| Standard Life Oil & Gas Ltd. | Same (Affil: Torch Energy Corporation) | |
| Standard of Indiana | Amoco Production Company | |
| Standard of Texas | Chevron USA, Inc. | |
| Standard Oil Co. of California | Chevron | |
| Standard Oil Co. of New Jersey | ExxonMobil | |
| Standard Oil Co. of New York (Socony) | ExxonMobil | |
| Standard Oil Company of California | Chevron USA, Inc. | |
| Standard Oil Company of Indiana | Amoco Production Company | |
| Standard Oil Company of Kentucky | Chevron USA, Inc. | |
| Standard Oil Company of New Jersey | Exxon Corporation | |
| Standard Oil Company of New York | Mobil Oil Corporation | |
| Standard Oil Company of Ohio | Sohio Petroleum Company | |
| Standard Oil Company of Texas | Chevron USA, Inc. | |
| Standard Oil Company, Inc. | Amoco Production Company | |
| Standard Oil Production Company | BP Exploration Inc. | |
| Stanolind Oil & Gas Company | Pan American Petroleum Corp. | |
| Star Oil & Gas Acquisitions, Ltd. | Star Oil & Gas Ltd. | |
| State Petroleum Corp. | Talisman Energy, Inc. | |
| Statoil, Inc. | Same | |
| Stelor Resources Ltd. | Murwell Resources Ltd. | |
| Stephen Petroleum | F.E. Harper & Cornell | |
| Sterling Drill & Prod. Co., Inc | PrimeEnergy Management Corp. | |
| Sterling Energy Ltd. | Same (Subsid: Sterling Energy, plc U. K.) | |
| Sterling Oil & Gas | Tenneco Oil Company | |
| STEX Energy Company | Same | |
| Stocker Resources, Inc. | Same (Subsid: Plains Resources, Inc.) | |
| Stone Energy Corp. | Same (Lafayette, Denver) | |
| Stonehenge Petroleum Corp. | Inland Fuels Corporation | |
| Storm Cat Energy Corp. | Same | |
| Stroud Energy, Inc. | Range Resources Corporation | |
| Sugar Creek Oil & Gas, Inc. | Ventura Energy, Inc. | |
| Summit Petroleum Corporation | Midland Resources, Inc. | |
| Summit Resources, Ltd. | Paramount Resources, Ltd. | |
| Sun | Sun Company, Inc. | |
| Sun Calvert Company | Sun Oil Company | |
| Sun Company, Inc. | Sunoco, Inc. | |
| Sun Company, Inc. (E&P Assets) | Sun Expl. & Prod. Company | |
| Sun Energy Partners, LP | Kerr-McGee Corporation | |
| Sun Expl. & Prod. Company | Oryx Energy Company | |
| Sun Oil Company | Sun Company, Inc. | |
| Sun Oil Company of Ohio | Sun Company, Inc. | |
| Sun Oil Line Company | Sun Oil Company of Ohio | |
| Sun Production | Sun Company, Inc. | |
| Sunac Petroleum Corp. | Sunset International Pet. Corp. | |
| Sunbelt Energy Inc. | Interamerican Corp. | |
| Sunco Trucking Company | Key Energy Group, Inc. | |
| Sundance Canada | Soquip | |
| Sunoco Energy Inc. | Same | |
| Sunoco, Inc. | Same | |
| Sunoma Energy, Inc. | Same | |
| Sunoma, Inc. | Chesapeake Energy Corp. | |
| Sunray DX Oil Company | Sun Company, Inc. | |
| Sunray Mid-Continent Oil Company | Sunray DX Oil Company | |
| Sunray Oil Corporation | Sunray DX Oil Company | |
| Sunset International Petroleum Corp. | Sipco, Inc. | |
| Sunshine Mining | Same | |
| Sunwing Energy, Inc. | Ivanhoe Energy, Inc. | |
| Superior Energy Services, Inc. | Same | |
| Superior Oil Company | Mobil Oil Corporation | |
| Supnev, Inc. | Superior Oil Company | |
| Supron Energy Corporation | Union Texas Petroleum Corp. | |
| Surprise Oil Corporation | Berry Petroleum Corporation | |
| Sweet Corporation | Oklahoma Acquisition Corp. | |
| SWEPI | Same | |
| Synthesis Energy Holding Inc. | Same (Suibsid: Synthesis Energy Systems Inc. | |
| T & L Oil Company | Texaco USA, Inc. | |
| Taeping Company | Jerry Chambers Exploration Co. | |
| Talisman Energy, Inc. | Same | |
| Tall Grass Services, LLC | Same (Sbusid: Devon Energy Corp.) | |
| Tamborine Holdings Inc. | Synthesis Energy Holdings Inc. | |
| Tamm Oil & Gas Corp. | Same (Reno, NV / Calgary) | |
| Tana Production Corporation | Texaco USA, Inc. | |
| Tandem Energy Holding, Inc. | Same (Subsid: Platinum Energy Resources, Inc.) | |
| Tannehill Oil Company | Berry Petroleum Corp. | |
| Tarasol Ventures Inc. | Founders Energy Ltd. | |
| Targa Permian LLC | Targa North Texas LLC | |
| Tarragon Oil & Gas, Ltd. | Same | |
| Tatonka Oil and Gas Inc. | Same (Denver) | |
| Taurus Exploration U.S.A., Inc. | Energen Resources Corporation | |
| Taurus Exploration, Inc. | Taurus Exploration U.S.A., Inc. | |
| Taylor Energy Company, LLC | Same (New Orleans) | |
| Taylor Refining | Tenneco Oil Company | |
| Taylor, John A. | Plains Resources, Inc. | |
| TBI Acquisitions Inc. | Brown, Tom Inc. | |
| TBI Exploration, Inc. | Brown, Tom Inc. | |
| TCPL Resources U.S.A. Ltd. | Wessely Energy Company | |
| TCW Group, Inc. | Same (Los Angeles) | |
| TCW Investment Management Group, Inc. | Same (Subsid: TCW Group, Inc.) | |
| TDC Energy Corp. | Same (New Orleans) | |
| Tea Australia Inc. | Same (Affil: Torch Energy Corporation) | |
| Teal Exploration, Ltd. | Same | |
| Teal Gathering Company | ARKLA Exploration Company | |
| Teal Pipeline Company | Same (Subsid: ARKLA Exploration Company) | |
| Tejas Gas Corp. | Kinder Morgan Energy Partners, LP | |
| Tejas Gas, LLC | Kinder Morgan Energy Partners, LP | |
| Tejas Natural Gas Liquids, LLC | Same (Subsid: Shell Oil Company) | |
| Tejas Oklahoma Marketing Company | Tejas Oklahoma Marketing, LLC | |
| Tejas Oklahoma Marketing, LLC | Same (Subsid: Tejas Gas Corp.) | |
| Tejas Power Corp. | TPC Corp. | |
| Tekoil Corp. | Consolidated Oil & Gas, Inc. | |
| Tema Oil Company | Mesa, Inc. | |
| Temex Energy, Inc. | TGX Corporation | |
| Temple Exploration, Inc. | Husky Energy, Inc. | |
| Tenkay Resources, Inc. | Same | |
| Tenneco Oil Company | Liquidated (See Notes in back) | |
| Tennessee Gas Transmission Company | Tenneco Oil Company | |
| Tensas Delta Company | Wheless Drilling Company | |
| Terra Resources, Inc. | Pacific Enterprises Oil Company | |
| Terry Energy, Inc. | Terry Petroleum Company | |
| Terry Operating Company | Terry Petroleum Company | |
| Terry Petroleum Company | Same | |
| Terry Resources Corp. | Terry Petroleum Company | |
| TES Acquisitions Corp. | Same (Subsid: American Exploration Company) | |
| Tesoro E & P Company, L.P. | EEX Onshore, Inc. | |
| Tesoro Petroleum Corporation (Partial) | Shell Oil Company | |
| Tesoro Petroleum Corporation (San Antonio) | EEX Corp. | |
| Tetco | Same | |
| Tex-Star Oil & Gas Corp. | Texas Oil & Gas Corporation | |
| TEX/CON Oil & Gas Company | PG&E Resources Company | |
| Texaco Exploration and Production Inc. | Same (Subsid: Texaco USA, Inc.) | |
| Texaco Inc. | Chevron | |
| Texaco Oils, Inc. | Texaco USA, Inc. | |
| Texaco Producing Inc. | Texaco Exploration and Production Inc. | |
| Texaco TPC Inc. | Texaco USA, Inc. | |
| Texaco USA, Inc. | Chevron Texaco Corp. | |
| Texaco-Seaboard, Inc. | Texaco USA, Inc. | |
| Texaco, Inc. | Texaco USA, Inc. | |
| Texas American Oil Corporation | Devon Energy Corp. | |
| Texas British Oil & Gas Corp. | Anvil Petroleum Corp. | |
| Texas Company, The | Texaco USA, Inc. | |
| Texas Eastern Transmission Company | Tetco | |
| Texas Fuel Company | Texaco USA, Inc. | |
| Texas Gas | Same | |
| Texas Gas Company | Texaco USA, Inc. | |
| Texas Gas Exploration Company | CSX Oil & Gas Corporation | |
| Texas Gas Producing Company | Reserve Oil, Inc. | |
| Texas Gasmark, Inc. | Delhi Gasmark, Inc. | |
| Texas Gulf Oil Company | Texas Gulf Production Company | |
| Texas Gulf Production Company | Sinclair Oil Corporation | |
| Texas Int’l Petroleum Company | TIPCO, Inc. | |
| Texas International Company | Phoenix Resources Companies, Inc. | |
| Texas Land and Mortgage Company | Andover Oil Company | |
| Texas Meridian Resources, Ltd. | Same | |
| Texas National Petroleum | Union Oil Company | |
| Texas Northeast Oil & Gas Company | Moore McCormack Company | |
| Texas Oil & Gas Corporation | TXO Production Corp. | |
| Texas Oils Inc. | Texaco Producing Inc. | |
| Texas Pacific Oil Company | Sun Expl. & Prod. Company | |
| Texas Utilities Companies | Same | |
| Texasgulf | Elf Aquitaine | |
| TexCal Energy, LLC | Venoco, Inc. | |
| Texco Energy Corporation | Egret Energy Corporation | |
| Texneft Inc. | Ocean Energy, Inc. | |
| Texoil, Inc. | Same (Houston) | |
| Texoma | Apache Corporation | |
| Texoma Trust, Ltd. | Cornell Oil Company | |
| Texota | Same | |
| Texstar Petroleum Inc. | Same (Subsid: Benz Energy Inc.) | |
| Textron Investment Management Co. | Paul Revere Investment Management Corp. | |
| TGX Corporation | Sheridan Energy, Inc. | |
| The "Shell" Transport and Trading Co. | Shell | |
| The Oil & Gas Company | W.P. Nelson & Company | |
| The Shamrock Oil and Gas Corporation | Diamond Shamrock Corporation | |
| The Texas Company | Texaco USA, Inc. | |
| Theomis Energy Company | Phoenix Energy Company | |
| Thermal Exploration, Inc. | Washington Energy Resources Company | |
| Thomas Drilling Company | Mack Energy Company | |
| Thomas, Nelson R. | Same | |
| Thousand Oaks Development Corporation | Ocean Energy, Inc. | |
| Three Rivers Operating Company | Concho Resources Inc. | |
| Three States | Delhi-Taylor Oil Company | |
| Threefarms | Same (Affil: The GHK Company) | |
| Thunder Creek Gas Services LLC (Wyoming) | Same (JV: K-N Energy, Inc/Devon Energy Corp.) | |
| Tidal Oil Company | Tidewater Oil Company | |
| Tide Water Associated Oil Co. | Tidewater Oil Company | |
| Tide West Oil Company | HS Resources, Inc. | |
| Tidewater Associated Oil Company | Getty Oil Company | |
| Tidewater Oil Company | Getty Oil Company | |
| Tidewater Petroleum | Chevron | |
| Tierra Petroleum Corp. | Georgetown Exploration Inc. | |
| Tikal Resources Corp. | Same (New York City) | |
| Tikal Resources Inc. | Tikal Resources Corp. | |
| TIPCO, Inc. | Texas International Company | |
| Tipperary Oil & Gas Corp. | Same | |
| Tipperary Petroleum Company | Tipperary Oil & Gas Corp. | |
| Titan Exploration | Matador Resources | |
| Titan Exploration Inc. | Pure Energy Resources Inc. | |
| TNC Media Inc. | Gothic Energy Corporation | |
| TNK-BP | Rosneft | |
| TOC Acquisitions Corp | Same (Subsid: American Exploration Company) | |
| TOC Rocky Mountains | Amoco Production Company | |
| Todd, C.H. Inc. | Same | |
| Toga Petroleum Company | Same | |
| TOGO Offshore Inc. | Same (Affil: Torch Energy Corporation) | |
| Toklan Oil and Gas Corporation | Cobb Oil and Gas Company | |
| Toklan Oil Company | Kirby Petroleum Corp. | |
| Tom Brown Inc. | EnCana Corporation | |
| Tom Brown/TXO | Encana/Marathon | |
| Tonkowa Gas Processing Company | Koch Midstream Processing Company (Subsid: Koch Industries, Inc.) | |
| Torch Canada | Same (Affil: Torch Energy Corporation) | |
| Torch Energy Advisors Inc. | Same (Affil: Torch Energy Corporation) | |
| Torch Energy Associates | Same (Affil: Torch Energy Corporation) | |
| Torch Energy Corporation | Same | |
| Torch Energy Marketing, Inc. | Same (Affil: Torch Energy Corporation) | |
| Torch Energy Royalty Trust | Same (Affil: Torch Energy Corporation) | |
| Torch Illini Ventures Inc. | Same (Affil: Torch Energy Corporation) | |
| Torch Limited Partnership | Same (Affil: Torch Energy Corporation) | |
| Torch Oil and Gas Company | Same (Affil: Torch Energy Corporation) | |
| Torch Operating Company | Same (Affil: Torch Energy Corporation) | |
| Torchmark Corporation | Same (Affil: Torch Energy Corporation) | |
| Toreador Resources Corporation | Same (Dallas) | |
| Tornado Resources Ltd. | Same | |
| Tosco Corp. | Phillips Petroleum Company | |
| Tosco Corporation | ConocoPhillips | |
| Total Minatome Corporation | Energen Resources Corporation | |
| Total Petroleum (Canada) | Rigel Energy Corp. | |
| Total Petroleum (North America), Ltd. | Liquidated (See Notes in back) Producing Assets | |
| Total Petroleum, Inc. | Same | |
| Total Resources Ltd. | Same | |
| Total, SA (Based in France with U.S. Assets) | Same | |
| Towner Petroleum Corp. | Zilkha Energy Company | |
| TPC Corp. | Same (Subsid: Harken Energy Corp.) | |
| TPC&C & Frankfort | Texas Pacific Oil Company | |
| TPEX Exploration, Inc. | Kestrel Energy, Inc. | |
| Trafalgar House Oil and Gas Inc. | Hardy Oil & Gas USA Inc. | |
| Trans-Texas Investments Inc. | United Trans-Western, Inc. | |
| Trans-Western Exploration, Inc. | United Trans-Western, Inc. | |
| Transamerica Development Co. | Same | |
| Transco Energy Company | Same | |
| Transcontinental Energy & Drilling | TXP Operating | |
| Transcontinental Gas Pipe Line Company | Transco | |
| TransGlobe Oil & Gas Corp. | Same | |
| Transierra Exploration Corp. | Belco Petroleum Corporation | |
| Transitory Corp. | GHK Company, The | |
| TransOcean Oil Company | Mobil Oil Corporation | |
| Transocean, Inc. | Same (Houston) | |
| Transok Gas Company | Transok Gas, LLC Same (Subsid: Enogex Inc.) | |
| Transok Gas Processing Company | Transok Gas Processing, LLC | |
| Transok Gas Processing, LLC | Same (Subsid: Enogex Inc.) | |
| Transok Gas, LLC | Same (Subsid: Enogex Inc.) | |
| Transok, Inc. | Transok, LLC | |
| Transok, LLC | Same (Subsid Enogex Inc.) | |
| Travellers, The (Ins. Co) | The Prospect Company (O&G int.) | |
| Trend Exploration Company | Trend Exploration I, LLC | |
| Trend Exploration I, LLC | Same | |
| Trendwell Energy Corporation | Same | |
| Trendwell Oil Corporation | Trendwell Energy Corporation | |
| Trexco Resources, Inc. | Balcron Oil Company | |
| Tri-Quest Energy Corp. | Same (Subsid: Corker Resources Inc.) | |
| Tri-Quest Energy Ltd. | Tri-Quest Energy Corp. | |
| Tri-Service Drilling Company | Midland Southwest Corporation | |
| Tri-Valley Corporation | Same | |
| Triana Energy Holdings LLC | Same | |
| Tribune Oil | Sabine Production Company | |
| Trice Production Company | Diamond Shamrock Exploration Co | |
| Trice Properties | Diamond Shamrock Exploration Co | |
| Trident Acquisition Corp. | Warren Intrastate Gas Supply, Inc. | |
| Trident Gas Marketing, Inc. | Warren Gas Marketing, Inc. | |
| Trident NGL Pipeline Company | Warren NGL Pipeline Company | |
| Trident NGL, Inc. | Warren NGL, Inc. | |
| TriDimension Energy LLC | Same (Dallas) | |
| Trinidad Oil | Texaco USA, Inc. | |
| Trinity Energy Resources, Inc. | Same (Houston) | |
| Trinity Gas Corp. | Trinity Energy Resources, Inc. | |
| Trinity Oil & Gas | Questa Oil & Gas, Inc. | |
| TriSearch Inc. | National Energy Group, Inc. | |
| Triton Oil & Gas Corp. | Same | |
| Triton Oil & Gas Corp. of Delaware | Worldwide Energy Corporation | |
| Triton Producing Company | Same | |
| Tronz-Om US and Canada, Ltd. | Blessure Hydrocarbons Corp. | |
| Trousil and Associates Inc. | Same | |
| Trustee Holding Corporation | Same (Affil: The GHK Company) | |
| TS, Inc. | Home Petroleum Corporation | |
| Tsrebol Oil Company | Rodman-Noel | |
| Tucker Drilling Company | Patterson Energy, Inc. | |
| Turbo Resources, Ltd. | Canadian Turbo, Inc. | |
| Turnan Oil Company | Mid-States Oil Corporation | |
| Tutamian Production Corporation | Same | |
| Tuthill & Barbee | Hugoton Energy Corp. | |
| Twelve Oil and Gas Corp. | Twelve Resources, Inc. | |
| Twelve Operations Company | Twelve Oil and Gas Corp. | |
| Twelve Resources, Inc. | Same | |
| Twelve Saddles Land and Cattle Company | Twelve Operations Company | |
| Twin Eagle Petroleum Corp. | Petromark Resources Company | |
| Twin Oil Company | Atlantic Richfield Company | |
| Twin Richfield Oils Ltd. | Glencoe Resources Ltd. | |
| TXCO Resources Inc. | Same (San Antonio) | |
| TXL Oil Corp. | Texaco USA, Inc. | |
| TXO Gas Marketing, Inc. | Delhi Gas Marketing, Inc. | |
| TXO Gas Ventures, Inc. | Delhi Gas Ventures, Inc. | |
| TXO Production Corp. | Marathon Oil Company | |
| TXOK Acquisition Inc. | Same (Subsid: Exco Resources Inc.) | |
| TXP Operating | Same | |
| U.S. Energy Corp. | Same | |
| U.S. Minerals Exploration | Same | |
| U.S. Oil | Mecom Oil | |
| U.S. Smelting Production Co. | U.V. Industries | |
| U.S. Steel Corp. | Marathon Petroleum Company | |
| U.V. Industries | Tenneco Oil Company | |
| Ultramar Corporation | Ultramar Diamond Shamrock Corp. | |
| Ultramar Diamond Shamrock Corp. | Valero Energy Corporation | |
| Ultramar, Inc. | Ultramar Diamond Shamrock Corp. | |
| UMC Petroleum Corporation | Ocean Energy Resources, Inc. | |
| UMC Petroleum Resources Corporation | UMC Petroleum Corporation | |
| Unetech International Corp. | Same (Subsid: CanArgo Energy Corp) | |
| Unibar Energy Services Inc. | Same | |
| Unical | Union Oil Co. of California | |
| Unicon Producing Company | Meridian Oil Production Company | |
| Unified Oil Company | Allied Chemical Corporation | |
| Unioil | Same (Subsid: Petroleum Development Corp) | |
| Uniol Energy Corporation | Gallent Oil Company | |
| Union Cal Inc. | Union Oil Co. of California | |
| Union Light, Heat and Power Inc. (KY) | Duke Energy Corp. | |
| Union O & G of Louisiana | Union Texas Petroleum Corp. | |
| Union of Louisiana | Union Texas Petroleum Corp. | |
| Union of Texas | Union Texas Petroleum Corp. | |
| Union of Texas Petroleum | Union Texas Petroleum Corp. | |
| Union Oil Co. of California | Chevron Texaco Corp.B2903 | |
| Union Oil Explorations Ltd. | Same (Affil: Torch Energy Corporation) | |
| Union Oil of California | Union Oil Co. of California | |
| Union Pacific Resources (UPR) | Occidental Petroleum | |
| Union Pacific Resources Company | Same (Subsid: Union Pacific Resources Group Inc.) | |
| Union Pacific Resources Group Inc. | Same (Subsid: Anadarko Petroleum Corp.) | |
| Union Petroleum of Texas | Union Texas Petroleum Corp. | |
| Union Producing Company | Penzoil Company | |
| Union S & O | Union Texas Petroleum Corp. | |
| Union Texas International Corp. | Same | |
| Union Texas Natural Gas Corp. | Union Texas Petroleum Corp. | |
| Union Texas Petroleum Corp. | Union Texas International Corp. | |
| Union Texas Petroleum Corp.(US Onshore) | Meridian Oil Inc. | |
| Unit Corporation | Same | |
| Unita Gas & Oil, Inc. | Coconino SMA, Inc. | |
| United American Life Ins. (O&G) Assets | Same (Affil: Torch Energy Corporation) | |
| United Carbon Company | United Carbon Producing Co., Inc. | |
| United Carbon Producing Co., Inc. | Ashland Oil & Refining Company | |
| United Energy Resources, Inc. | Midcon | |
| United Gas, Inc. | Pennzoil Company | |
| United Investors Management Co. | Same (Affil: Torch Energy Corporation) | |
| United Meridian Corp. | Ocean Energy, Inc. | |
| United Petroleum Corporation (Knoxville, TN) | Same | |
| United Producing Company | Same | |
| United States Borax & Chemical Corp. | Same | |
| United States Exploration, Inc. | Noble Energy Inc. | |
| United Trans-Western, Inc. | Same | |
| Universal Consolidated | Chevron USA, Inc. | |
| Universal Resources Corporation | Questar Exploration and Production Company | |
| UNOCAL Corporation | Chevron Corporation | |
| UNOCAL Corporation (San Juan and Permian Assets) | Pure Energy Resources, Inc. (New entity 2001) | |
| USM Oil Company | Olix Industries, Inc. | |
| Utah International, Inc. | Ladd Petroleum Corp. | |
| Utah Oil Company | Amoco Production Company | |
| Utah Oil Refining Company | Amoco Production Company | |
| Vacuum Oil Company | ExxonMobil | |
| VAL Energy, Inc. | Same | |
| Valero Energy Corporation | Same (San Antonio) | |
| Validus Energy | Devon Energy | |
| Vanguard Natural Resources LLC | Encore Energy Partners Operating LLC | |
| Vantage Point Energy, Inc. | ConVest Energy Corp. | |
| Vantas Energy Corp. | Same (Subsid: PG&E) | |
| Varco International, Inc. | National-Oilwell Varco, Inc. | |
| Varn Oil Company | Same | |
| Vastar Resources | BP | |
| Vastar Resources, Inc. | BP Amoco Inc. | |
| Vaughn Management, Inc. | Same | |
| Vaughn Petroleum, Inc. | Vaughn Management, Inc. | |
| Velasco Gas Company, LP | Same (Affil: Torch Energy Corporation) | |
| Velvet Exploration, Ltd. (Calgary) | El Paso Oil & Gas Canada Acquisition Corp. | |
| Venoco, Inc. | Same (Denver) | |
| Ventura Energy, Inc. | Same | |
| Venucot Resources, Inc. | Diverse Energy Investment, Inc. | |
| Venus Exploration Inc. | PYR Energy Corp. | |
| Venus Oil Company | Same | |
| Vesta Energy Company | Edisto Resources Corp. | |
| Vickers Petroleum Company, Inc. | Vickers Refining Company, Inc. | |
| Vickers Refining Company, Inc. | Total Petroleum, Inc. | |
| Victory Oil & Gas Company | P.P. M. Investments (USA), Inc. | |
| Viersen & Cochran | Same | |
| Viersen & Sant | Same (Affil: Viersen & Cochran) | |
| Viersen Land & Royalty Co. | Same (Affil: Viersen & Cochran) | |
| Viersen Oil & Gas Co. | Same (Affil: Viersen & Cochran) | |
| Viking Oil Ltd. | Sun Company, Inc. | |
| Viking Petroleum Reserves, Inc. | Same | |
| Viking Petroleum, Inc. | Viking Petroleum Reserves, Inc. | |
| Villines-Gibson Oil and Gas | Courtaulds North America Inc. | |
| Vine Energy | Chesapeake Energy | |
| Vintage Petroleum | Occidental Petroleum | |
| Vintage Petroleum Inc. | Same (Subsid: Occidental Petroleum Corp.) | |
| Vision Energy Inc. | Same (Affil: Seitel Inc.) | |
| Vista Energy Resources Inc. (Midland) | Prize Energy Corp. | |
| Volunteer Energy, LLC (Tulsa) | First Energy Corp. | |
| Volvo Petroleum | Same | |
| Voyager Energy Inc. | Poco Petroleum Ltd. | |
| Voyager Petroleum | Nu-West Development | |
| VP Oil Inc. | National Energy Group Inc. | |
| Vulcan Minerals & Energy Inc. | Same (Subsid: Regent Group – Houston) | |
| Vysis, Inc. | Amoco Production Company | |
| W & T Offshore, Inc. | Same (Houston) (Affil: Kerr-McGee Corp.) | |
| Wacker Oil Inc. | Seagull Energy Corp. | |
| Wagner Oil Company | Same (Ft. Worth) | |
| Wahlenwier Oil Company | Tenneco Oil Company | |
| Wainoco Oil Corp. | Same | |
| Walker Energy Partners, MLP | Texas Meridian Resources, Ltd. | |
| Waller County Minerals Company | Ocean Energy, Inc. | |
| Ward Petroleum Corp. | Same (Enid, OK) | |
| Warren American Oil Company (Tulsa) | Same (Subsid: NGC Corporation) | |
| Warren Arkansas Gathering, Inc. (Houston) | Same (Subsid: NGC Corporation) | |
| Warren Energy Resources, Ltd. Pts (Houston) | Same (Subsid: NGC Corporation) | |
| Warren Energy, Inc. (Houston) | Same (Subsid: NGC Corporation) | |
| Warren Gas Liquids, Inc. (Houston) | Same (Subsid: NGC Corporation) | |
| Warren Gas Marketing, Inc. (Houston) | Same (Subsid: NGC Corporation) | |
| Warren Intrastate Gas Supply, Inc. | Same (Subsid: NGC Corporation) | |
| Warren NGL, Inc. (Houston) | Same | |
| Warren NGL, Pipeline Co. (Houston) | Same | |
| Warren Petroleum Company | Sipco, Inc. | |
| Warren-Bradshaw | Chevron USA, Inc. | |
| Warrior Energy Services Corporation | Superior Energy Services, Inc. | |
| Washington Energy Resources Company | Cabot Oil & Gas Corporation | |
| Washita Oil & Gas, LLC | Same | |
| Washita Production Company | ONEOK Resources Company | |
| Waterford Energy, Inc. | Kaiser-Francis Oil Company | |
| Watson Geophysics, Inc. | MCOR Oil Development, Inc. | |
| Watson Oil Corporation | MCOR Oil Development, Inc. | |
| Watson Oil Petroleums Exploration, Inc. | MCOR Oil Development, Inc. | |
| Watson Petroleums Exploration, Inc. | Ocean Energy, Inc. | |
| WCX Corporation | Mesa, Inc. | |
| Webb Resources | Standard Oil Production Company | |
| WEC Acquisition Corp. | Whittier Energy Corp. | |
| Weco Development Corporation | Worldwide Energy Corporation | |
| Welchem, Inc. | Amoco Production Company | |
| Wellington Oil Company | Texaco USA, Inc. | |
| Wessely Energy Co. | NGC Energy Co. | |
| West America Corp. | Same | |
| Westates Petroleum | Hamilton Dome | |
| Westbrook Energy Corp. | Manhattan Resources Corp. | |
| Westcoast Energy, Inc. | New World Development Co., Ltd. | |
| Westcoast Petroleum Ltd. | Numac Oil & Gas Ltd. | |
| Western Crude Oil, Inc. | Reserve Oil and Gas Company | |
| Western Decalta | Loram International | |
| Western Dev. Co. of Del. | International Oil & Gas Corp. | |
| Western Energy Development Company | Oxford Consolidated, Inc. | |
| Western Energy Resources Inc. | OMNI Power Inc. | |
| Western Gas Processors, Ltd. | Same | |
| Western Gas Resources Inc. | Occidental Petroleum | |
| Western Gulf Oil Company | Chevron USA, Inc. | |
| Western Natural | El Paso Products Company | |
| Western Natural Gas | Atlantic Richfield Company | |
| Western Oil Fields, Inc. | Same | |
| Western Oil Sands, Inc. | Marathon Oil Corporation | |
| Western Petroleum Assoc. | Same | |
| Western Production Company | Black Hills Exploration and Production, Inc. | |
| Westport Oil & Gas Inc. | Belco Oil & Gas Corp. | |
| Westport Resources Corp. (Denver) | Kerr-McGee Corp. | |
| WGP, Inc. | Same (Subsid: Western Gas Processors, Ltd.) | |
| Whaley Company | Kewanee Oil Company | |
| Wheless Drilling Company | Same | |
| White Eagle International Oil Company | White Eagle International, Inc. | |
| White Eagle International, Inc. | Helmerich & Payne, Inc. | |
| White Shield Oil Company | Helmerich & Payne, Inc. | |
| Whiting Petroleum Corp. | Same (Subsid: IES Industries, Inc. – Denver) | |
| Whittier Energy Company | Whittier Energy Corp. | |
| Whittier Energy Corp. (Houston) | Sterling Energy, Inc. (Houston) | |
| Wilco Properties, Inc. | Same | |
| Wilcox Corporation | Tennco Oil Company | |
| Wilcox Oil Company | Tennco Oil Company | |
| Wilcox Oil Corporation | Tennco Oil Company | |
| Wildhorse Resource Development | Chesapeake Energy | |
| Willard Pease Oil & Gas Co. | Pease Oil and Gas Company | |
| Williams Companies, The | Same | |
| Williams Energy Partners L.P. | Same (Affil: Williams Companies, Inc.) | |
| Williams Production Company | Devon Energy | |
| Williams, L.G., Oil Co., Inc. | Matrix Energy, Inc. | |
| Williamson, J.C. | Tenneco Oil Company | |
| Willimax | Shell Oil Company | |
| Wilshire | B-L Associates | |
| Wilshire Oil of California | Chevron USA, Inc. | |
| Windfohr Oil Company | Burnett Oil Company | |
| Windor Energy Group, LLC | Same (Affil: Gulfport Energy Inc. | |
| Windsor Petroleum | Southwestern Production Corp. | |
| Wintershall Energy Inc. | Same | |
| Wintershall Oil & Gas Company | American Petrofina, Inc. | |
| Wiser Oil Company (Dallas) | Forest Oil Corporation | |
| WO Exploration Inc. | Ocean Energy, Inc. | |
| WO Offshore Inc. | Ocean Energy, Inc. | |
| WOC Acquisition Company | Same | |
| Wolfson Oil Company | Sipco, Inc. | |
| Wolverine Exploration Company | Amerac Energy Corporation | |
| Wolverine/XTO | Am. Quasar/Exxon | |
| Womad Oil Company | Quebec Affiliates (North America), Ltd. | |
| Wood River Oil & Refinery | Rock Island Oil & Refining Company, Inc. | |
| Woodbine Petroleum, Inc. | Same (Subsid: Nycal Corp.) | |
| Woodley Petroleum | Pure Oil Company | |
| Woods Petroleum Corp. | Sonat Exploration Co. | |
| Woodside Petroleum, Ltd. | Same (Australian Co. with US Assets) | |
| Woodson Oil Company | Texas Pacific Oil Company | |
| World Fuel Services Corp. | Same | |
| Worldwide Energy Corporation | Triton Oil & Gas Corp. | |
| WPX Energy, Inc. | Devon Energy | |
| Wrather, J.D., Jr. | Same | |
| Wrightsman, C.J. | Moncrief, W.A. | |
| WRT Energy, Inc. | Same (Affil: DLB Oil & Gas, Inc.) | |
| WTG Midstream | Energy Transfer | |
| WW Oil & Gas Inc. | Paco Integrated Energy, Inc. | |
| Wynn-Crosby 1994, Ltd. | Wynn-Crosby Energy, Inc. | |
| Wynn-Crosby Energy, Inc. | Petrohawk Operating Company | |
| Wyoming Montana & Indiana Petroleum | Western Petroleum | |
| XCL | See Exploration Company of Louisiana | |
| XCL, Ltd. | Same | |
| XOM | Same (Subsid: ExxonMobil Corp.) | |
| Xplor Corp. | Venus Exploration Inc. | |
| Xplor Energy Inc. (Houston) | Harken Energy Corporation | |
| XTO Energy Inc. | ExxonMobil Corp. | |
| Yankee Production Corporation | Alfonso Production Company | |
| Yankee Resources, Inc. | Access Energy Corp. | |
| Yates Petroleum Corp. | Same (Artesia, NM) | |
| Yates Petroleum Corporation | EOG Resources | |
| YNB Oil and Gas Inc. | Caravelle Petroleum, Inc. | |
| York & Harper | Tenneco Oil Company | |
| Young, Marshall R. | Young, Marshall R. Drilling Company | |
| Yount-Lee Oil Company | Amoco Production Company | |
| Yukon Trading Company, LLC | Same (Affil: JMA Energy Company, LLC) | |
| Zapata & Statco | Pennzoil Company | |
| Zapata Corp. | Norex Drilling, Inc. | |
| ZBX, Inc. | Matlin Petroleum Corporation | |
| ZCA Gas Gathering, Inc. | United States Exploration, Inc. | |
| Zenergy Inc. | Same (Tulsa) | |
| Zenergy Operating Company LLC | Same (Subsid: Zenergy Inc.) | |
| ZG Energy Corporation | Vantage Point Energy, Inc. | |
| Zilkha Energy Company | Sonat, Inc. | |
| Zoller & Danneberg, Inc. | Premier Resources, Ltd. | |
| Zuma New-Mexico Oil Corporation | Jackalope-New-Mexico Oil Co. | |
| Adventure Exploration Partners LLC | Bluestem Energy Assets LLC (NKA) | |
| Bluestem Energy Assets LLC | Rio Oil and Gas LLC (co-amendt 2013, Midland) | |
| Burlington Resources Oil & Gas Co | Crownquest Operating LLC (2000 agreement) | |
| Burlington Resources Oil & Gas Co LP | CrownRock LP (AMD OGL 2015) | |
| Burlington Resources Oil & Gas Co LP | DE Midland III LLC (2018 assignment) | |
| Burlington Resources / BROG GP LLC + ConocoPhillips | Pioneer Natural Resources USA Inc (2022-2024 partial assignments) | |
| Burlington Resources / BROG GP LLC + ConocoPhillips | Endeavor Energy Resources LP (Assignment & Bill of Sale, 2025) | |
| Burlington Resources / BROG GP + COG Operating LLC + XTO Holdings LLC | Waggener Greg Agent (Assignment 2024, T&P RR Co Sec 34 Blk 38) | |
| Kerr McGee & Co | Kerr McGee Oil Industries Inc (Warranty Deed 1946) | |
| Kerr McGee Oil and Gas Onshore LP | Adventure Exploration Partners LLC (PTL ASG 2010) | |
| Kerr McGee Oil and Gas Onshore LP | Bluestem Energy Assets LLC (AMD 2013) | |
| Kerr McGee Oil and Gas Onshore LP | Double Eagle Lone Star LLC (PTL ASG 2016) | |
| Kerr McGee Oil and Gas Onshore LP | CrownRock Minerals LP (Assignment Reversionary Interests 2023) | |
| Kerr McGee Oil & Gas Onshore LP + OXY entities | OXY USA EOR LLC + Placid Oil EOR LLC (Assignment 5/22/2026) | |
| Concho Resources Inc + Devon Acquisition Corp + Devon Permian Corp | Certificate 2001 (Devon/Concho corporate connection) | |
| Concho Resources Inc | Kaiser Francis Oil Co (Bill of Sale 2000) | |
| Concho Resources LLC + Concho Oil & Gas Holding LP | Henry Resources LLC (Disclaimer/Quit Claim 2025) | |
| HHE Energy Company + XH LLC + XTO Energy Inc | Cross Timbers Energy LLC (Assignment 2012) | |
| ExxonMobil Corporation + XTO Energy Inc | Pioneer Natural Resources USA Inc (Memorandum + Assignment, Dec 2014) | |
| XTO Energy Inc | Rodeo Midland Basin LLC + XTO Holdings LLC (T&P RR Co Secs 1,12 Blk 41) | |
| XTO Energy Inc + ExxonMobil Corp + Mobil Producing TX NM Inc | Chevron USA Inc (Multiple Agreements 2014-2017, T&P RY CO Blk 39-40) | |
| XTO Energy Inc | Endeavor Energy Resources LP (Multiple Assignments 2016-2017) | |
| ExxonMobil Corporation + XTO Energy Inc + ExxonMobil Oil Corp + Mobil E&P US Dev Corp | Berry Petroleum Company LLC + Linn Energy Holdings LLC (Assignment 2016) | |
| Cross Timbers Energy LLC | SM Energy Company (Assignment 2019, T&P RR Co Sec 3 Blk 39) | |
| Cross Timbers Energy LLC | Hilcorp Royalty & Minerals LLC (Assignment & Conveyance 5/11/2026) | |
| Parker Parsley Inc | Phillips Petroleum Company (Casinghead Gas Contract 1978-1979, Midland) | |
| Burlington Resources Oil & Gas Co | Magnum Hunter Production Inc (Assignment + Bill of Sale 1997) | |
| Burlington Resources Oil & Gas Co | Northstar Operating Company (Assignment 2004) | |
| Burlington Resources Oil and Gas Company | Petroplex Energy Inc (Ratification 2013, Secs 7-8 Blk 39) | |
| Burlington Resources Oil and Gas Co + RSP Permian LLC + ConocoPhillips | Pioneer Natural Resources USA Inc (Assignment & Bill of Sale 2024) |