| 1001 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 1002 | Diversified Energy Investments | | Oil & Gas Operator | May 2009 |
| 1003 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Dec 2025 |
| 1004 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 1005 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2025 |
| 1006 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 1007 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 1008 | Diversified Resources LLC | | Gas Operator | Nov 2025 |
| 1009 | Diversified Resources, Inc. | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2020 |
| 1010 | Diversified Southern Production LLC | | Oil & Gas Operator | Dec 2018 |
| 1011 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 1012 | Divide Petroleum Co | | Oil & Gas Operator | May 2000 |
| 1013 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 1014 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 1015 | Dixie Energy Co Inc | Columbus, OH 43221-2546 | Oil & Gas Operator | Dec 1987 |
| 1016 | Dixie Lake Operating, LLC | Longview, TX 75606 | Gas Operator | Feb 2026 |
| 1017 | Dixie Natural Gas Co. | | Oil & Gas Operator | Dec 2002 |
| 1018 | Dixie Oil Company Inc | Moore, OK 73153 | Oil & Gas Operator | Nov 1994 |
| 1019 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |
| 1020 | Dixie Oil, LLC | Hamilton, KS 66853 | Oil Operator | Aug 2025 |
| 1021 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 1022 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 1023 | Dixie Well Service, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1024 | Dixon David | Okmulgee, OK 74447-2066 | Oil & Gas Operator | Nov 2025 |
| 1025 | Dixon Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2023 |
| 1026 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 1027 | Dixon J C | Okmulgee, OK 74447-8522 | Oil & Gas Operator | Oct 2025 |
| 1028 | Dixon Management Corp. | | Oil & Gas Operator | May 1984 |
| 1029 | Dixon Oil Compan | | Oil Operator | Apr 1994 |
| 1030 | Dixon Operating Company, LLC | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 1031 | Dixon, Bucky | | Oil & Gas Operator | Aug 2016 |
| 1032 | Dixon, Margaret | Moline, KS 67353 | Oil Operator | Dec 2009 |
| 1033 | Dixon, Mike | Moline, KS 67353 | Oil Operator | Sep 2025 |
| 1034 | Dixon, N. D. | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 1035 | Dixon, Robin Francine | Moline, KS 67353 | Oil Operator | Sep 2025 |
| 1036 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 1037 | DJ Exploration, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Feb 2026 |
| 1038 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 1039 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 1040 | DJH Investments, Inc. | Houston, TX 77024 | Oil Operator | Feb 2026 |
| 1041 | DJH Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1042 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 1043 | DJR Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Dec 2025 |
| 1044 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2025 |
| 1045 | DJS Farms Inc. | Waterloo, NY 13165 | Gas Operator | Dec 2024 |
| 1046 | DJW Enterprises Inc | Buckhannon, WV 26201-9126 | Gas Operator | Dec 2025 |
| 1047 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 1048 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Sep 2025 |
| 1049 | DKD Production, LLC | Tatum, NM 88267 | Oil Operator | Jan 2026 |
| 1050 | DKD,LLC | Tatum, NM 88267 | Oil & Gas Operator | Oct 2022 |
| 1051 | DKM Offshore Energy Inc. | | Oil & Gas Operator | Dec 1993 |
| 1052 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 1053 | DKMR Oil Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2017 |
| 1054 | DKT Energy LLC | Edmond, OK 73083-6844 | Oil & Gas Operator | Sep 2014 |
| 1055 | DKW Energy, Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Feb 2026 |
| 1056 | DL Energy, LLC | Saco, MT 59261 | Gas Operator | Nov 2025 |
| 1057 | DL Resources Inc | Ludlow, PA 16333-0039 | Oil & Gas Operator | Dec 2025 |
| 1058 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 1059 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 1060 | DLJ Investments, LLC | Springboro, OH 45006 | Oil Operator | Dec 2023 |
| 1061 | DLKB Operating LLC | Eufaula, OK 74432 | Gas Operator | Nov 2025 |
| 1062 | DLM Energy | Houston, TX 77058 | Oil & Gas Operator | Sep 1994 |
| 1063 | DLM Oil | | Oil Operator | Nov 2008 |
| 1064 | DLM Ventures | | Oil & Gas Operator | Dec 2004 |
| 1065 | DLM Ventures LLC | | Oil & Gas Operator | Dec 2004 |
| 1066 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 1067 | DM Petroleum LLC | Duncan, OK 73533 | Oil Operator | Dec 2025 |
| 1068 | Dmaebil Corporation | Grapevine, TX 76051 | Gas Operator | Jan 2024 |
| 1069 | DMH Petroleum, Inc. | Sterling, KS 67579 | Oil Operator | Aug 2025 |
| 1070 | DML Exploration, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 1071 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 1072 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 1073 | DMV Pipeline LLC | Lipan, TX 76462 | Oil & Gas Operator | Feb 2026 |
| 1074 | Dna Petroleum Inc. | | Oil Operator | Dec 2004 |
| 1075 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 1076 | DNL Oil Corp | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2012 |
| 1077 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 1078 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 1079 | Dobbs Oil & Gas | | Oil Operator | Dec 2013 |
| 1080 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 1081 | Dobrinski, Mark E., A General Partnership | Coldwater, KS 67029 | Oil Operator | Feb 2008 |
| 1082 | Dobson Oil And Gas LLC | Deer Creek, OK 74636 | Oil Operator | Aug 2022 |
| 1083 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 1084 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 1085 | Doc Oil Corp. | | Oil Operator | Dec 2006 |
| 1086 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 1087 | Docherty Operating, L.L.C. | | Oil Operator | Dec 2024 |
| 1088 | Docking Developm | | Oil & Gas Operator | Dec 1996 |
| 1089 | Docking Development Company, LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Oct 2013 |
| 1090 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 1091 | Dodd Oil & Gas | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 1092 | Dodd, C. C., Oil & Gas | | Oil & Gas Operator | Dec 2021 |
| 1093 | Dodson Prairie Oil & Gas LLC | San Antonio, TX 78205 | Gas Operator | Feb 2026 |
| 1094 | Dodson, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 1998 |
| 1095 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 1096 | Doege, Donald | La Vernia, TX 78121 | Oil & Gas Operator | Feb 2026 |
| 1097 | Doege, Harry | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2003 |
| 1098 | Doenges, William C. | Pampa, TX 79065 | Gas Operator | Jun 1993 |
| 1099 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | Feb 2026 |
| 1100 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |