| 1001 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 1002 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Feb 2026 |
| 1003 | DKD Production, LLC | Tatum, NM 88267 | Oil Operator | Jul 2026 |
| 1004 | DKD,LLC | Tatum, NM 88267 | Oil & Gas Operator | Oct 2022 |
| 1005 | DKM Offshore Energy Inc. | | Oil & Gas Operator | Dec 1993 |
| 1006 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 1007 | DKMR Oil Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2017 |
| 1008 | DKT Energy LLC | Edmond, OK 73083-6844 | Oil & Gas Operator | Sep 2014 |
| 1009 | DKW Energy, Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Sep 2026 |
| 1010 | DL Energy, LLC | Saco, MT 59261 | Gas Operator | Jun 2026 |
| 1011 | DL Resources Inc | | Oil & Gas Operator | Dec 2025 |
| 1012 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 1013 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Sep 2026 |
| 1014 | DLJ Investments, LLC | Springboro, OH 45006 | Oil Operator | Dec 2023 |
| 1015 | DLKB Operating LLC | Eufaula, OK 74432 | Gas Operator | Jun 2026 |
| 1016 | DLM Energy | Houston, TX 77058 | Oil & Gas Operator | Sep 1994 |
| 1017 | DLM Oil | | Oil Operator | Nov 2008 |
| 1018 | DLM Ventures | | Oil & Gas Operator | Dec 2004 |
| 1019 | DLM Ventures LLC | | Oil & Gas Operator | Dec 2004 |
| 1020 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 1021 | DM Petroleum LLC | Duncan, OK 73533 | Oil Operator | Jun 2026 |
| 1022 | DMH Petroleum, Inc. | Sterling, KS 67579 | Oil Operator | Apr 2026 |
| 1023 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 1024 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2026 |
| 1025 | DMV Pipeline LLC | Lipan, TX 76462 | Oil & Gas Operator | Sep 2026 |
| 1026 | Dna Petroleum Inc. | | Oil Operator | Dec 2004 |
| 1027 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 1028 | DNL Oil Corp | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2012 |
| 1029 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 2026 |
| 1030 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 1031 | Dobbs Oil & Gas | | Oil Operator | Dec 2013 |
| 1032 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Sep 2026 |
| 1033 | Dobrinski, Mark E., A General Partnership | Coldwater, KS 67029 | Oil Operator | Feb 2008 |
| 1034 | Dobson Oil And Gas LLC | Deer Creek, OK 74636 | Oil Operator | Aug 2022 |
| 1035 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 1036 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 1037 | Doc Oil Corp. | | Oil Operator | Dec 2006 |
| 1038 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 1039 | Docherty Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 1040 | Docking Developm | | Oil & Gas Operator | Dec 1996 |
| 1041 | Docking Development Company, LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Oct 2013 |
| 1042 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Jun 2026 |
| 1043 | Dodd Oil & Gas | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 1044 | Dodd, C. C., Oil & Gas | | Oil & Gas Operator | Dec 2021 |
| 1045 | Dodson, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 1998 |
| 1046 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 1047 | Doege, Donald | La Vernia, TX 78121 | Oil & Gas Operator | Sep 2026 |
| 1048 | Doege, Harry | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 1049 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Sep 2026 |
| 1050 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Sep 2026 |
| 1051 | Dol Resources Inc | Rowlett, TX 75088 | Oil & Gas Operator | Aug 2026 |
| 1052 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Sep 2026 |
| 1053 | Dolch Production, Inc. | San Antonio, TX 78248 | Oil & Gas Operator | Jul 1996 |
| 1054 | Dole Enterprises Inc. | | Oil & Gas Operator | Jul 2026 |
| 1055 | Dolezal George Jr | Littleton, CO 80163 | Oil & Gas Operator | Sep 2006 |
| 1056 | Dolinar, Michael J. | Angola, NY 14006 | Gas Operator | Dec 2025 |
| 1057 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Mar 2026 |
| 1058 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 1059 | Dolphin Petroleum, LP | Alice, TX 78333 | Oil & Gas Operator | Sep 2026 |
| 1060 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 1061 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 1062 | Domar Oil & Gas Inc | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 1063 | Dome De Sel LLC | | Oil & Gas Operator | Nov 2024 |
| 1064 | Dome Drilling Co | Westlake, OH 44145-1964 | Oil & Gas Operator | Dec 2009 |
| 1065 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 1066 | Dome Producing | Cleveland, OH 44114 | Oil & Gas Operator | Dec 1988 |
| 1067 | Domestic Energy Corporation | | Oil Operator | Jan 1988 |
| 1068 | Domestic Oil & Gas Co | Bedford, OH 44146 | Oil & Gas Operator | Dec 1990 |
| 1069 | Domestic Oil Producers | | Oil Operator | Oct 1980 |
| 1070 | Domestic Oil Producers,Inc. | | Oil Operator | Oct 1998 |
| 1071 | Domestic Oil Production | | Oil & Gas Operator | Oct 1989 |
| 1072 | Dominguez Energy L.P. | | Oil & Gas Operator | Dec 2000 |
| 1073 | Dominguez Properties | | Oil & Gas Operator | Dec 1991 |
| 1074 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 1075 | Dominion Energy Transmission, Inc. | | Oil & Gas Operator | Dec 2019 |
| 1076 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 1077 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 1078 | Dominion Field Services Inc | Richmond, VA 23219 | Oil & Gas Operator | Dec 2013 |
| 1079 | Dominion Midstream Services, LP | | Oil Operator | Dec 2006 |
| 1080 | Dominion Midwest Energy Inc | | Oil & Gas Operator | Dec 2007 |
| 1081 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 1082 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Sep 2026 |
| 1083 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 1084 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 1085 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 1086 | Dominion Oklahoma Texas Exploration & Production | Houston, TX 77060 | Oil & Gas Operator | Dec 2006 |
| 1087 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |
| 1088 | Dominion Production Company, LLC | Tampa, FL 33606 | Oil & Gas Operator | Sep 2026 |
| 1089 | Dominion Resources, Inc | Staffordsville, KY 41256 | Oil & Gas Operator | Dec 2024 |
| 1090 | Dominiq Operating, Inc | Scurry, TX 75158 | Oil Operator | Dec 2023 |
| 1091 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Sep 2026 |
| 1092 | Domino Prod Services Inc | Bellville, TX 77418 | Oil & Gas Operator | Feb 2004 |
| 1093 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 1094 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 1095 | Don Byers Oil & Gas LLC | Heath, OH 43056 | Oil & Gas Operator | Dec 2025 |
| 1096 | Don Erbert Oil Company | | Oil Operator | Oct 2013 |
| 1097 | Don G. Wiley, Jr. | | Oil Operator | Dec 1979 |
| 1098 | Don Karst Well Service, Inc. | Russell, KS 67665 | Oil Operator | Mar 2026 |
| 1099 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Sep 2026 |
| 1100 | Don R Ormand | Midland, TX 79702 | Oil & Gas Operator | Jun 2014 |