| 1001 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Dec 2024 |
| 1002 | Esp Energy, LLC | Nocona, TX 76255 | Oil Operator | Apr 2025 |
| 1003 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | Apr 2025 |
| 1004 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 1005 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 1006 | Esquire Oil And Gas LLC | | Oil & Gas Operator | Jan 2011 |
| 1007 | Essex Corporation | | Oil Operator | Jan 1983 |
| 1008 | Essex Corporation Of Louisiana | | Oil Operator | Dec 1997 |
| 1009 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 1010 | Essex Resources, LLC | Coffeyville, KS 67337 | Oil Operator | Oct 2024 |
| 1011 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 1012 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 1013 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 1014 | Estacado Energy, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 1999 |
| 1015 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 1016 | Estancia Oil & Gas, LLC | Austin, TX 78716 | Oil & Gas Operator | Apr 2025 |
| 1017 | Estate Of C.B. Christie Jr | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 1018 | Estate Of Crawford Oil & Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 2006 |
| 1019 | Estate Of Doris Jean Davis Carr | Buckhannon, WV 26201 | Gas Operator | Dec 2021 |
| 1020 | Estate Of Edwin L. Bower | | Gas Operator | Dec 2023 |
| 1021 | Estate Of George Cantor | | Oil Operator | Dec 1988 |
| 1022 | Estate Of James L. Nelson | Pettus, TX 78146 | Oil & Gas Operator | Apr 2025 |
| 1023 | Estate Of James Robert Wells | West Henrietta, NY 14586 | Oil Operator | Dec 2023 |
| 1024 | Estate Of Jerome B. Herrmann | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2022 |
| 1025 | Estate Of L. C. Dougan | | Gas Operator | Dec 1987 |
| 1026 | Estate Of Robert J. Burick | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 1027 | Estate Of William G. Helis | | Oil & Gas Operator | May 1994 |
| 1028 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 1029 | Estes And Company LLC. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 1030 | Estes Operating, Inc. | San Antonio, TX 78210 | Oil & Gas Operator | Mar 2002 |
| 1031 | Estes Operating, LLC | La Porte, TX 77571 | Oil & Gas Operator | Apr 2025 |
| 1032 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 1033 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 1034 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 1035 | Etc Oil Co. | Pecos, TX 79772 | Oil & Gas Operator | Mar 2004 |
| 1036 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 1037 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 1038 | Etchegoin Oil LLC | | Oil & Gas Operator | Dec 2024 |
| 1039 | Etd Oil Co. | | Oil Operator | Oct 1990 |
| 1040 | Eternity Exploration, LLC | Coppell, TX 75019 | Oil Operator | Dec 2024 |
| 1041 | Ethredge & Rhoads Oil Company | | Oil Operator | Dec 2012 |
| 1042 | Ethredge Oil Company | | Oil & Gas Operator | Aug 1998 |
| 1043 | Ethyl Gas Company, LLC | | Oil Operator | Jan 2025 |
| 1044 | Ethyl Properties Inc. | | Oil & Gas Operator | Aug 1989 |
| 1045 | Ethyl-Buchanan | | Oil & Gas Operator | Feb 1987 |
| 1046 | Etl Hydrocarbons, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 1047 | Etm Operating Company, Inc. | Houston, TX 77079 | Oil Operator | Feb 2009 |
| 1048 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 1049 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 1050 | Etopsi Oil And Gas, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 1051 | Etos Operating, Inc. | New London, TX 75682 | Oil & Gas Operator | Apr 2025 |
| 1052 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 1053 | Etter Road Investments LLC | Erie, PA 16505-1352 | Gas Operator | Dec 2024 |
| 1054 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 1055 | Eubank Michael Dba Trilby Oil Company | Amber, OK 73004-4903 | Oil Operator | May 2022 |
| 1056 | Eubank Operating Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2024 |
| 1057 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 1058 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 1059 | Eufaula Enterpri | | Oil & Gas Operator | Mar 1986 |
| 1060 | Eufaula Enterprises Inc | | Gas Operator | Nov 1997 |
| 1061 | Eugene E. Marble | | Oil Operator | Dec 1981 |
| 1062 | Eugene Talbert Operg. Co. Inc. | | Oil & Gas Operator | Mar 2013 |
| 1063 | Eunice Well Service Inc | Eunice, NM 88231 | Oil & Gas Operator | Jan 2000 |
| 1064 | Euram Petroleum | | Oil Operator | Apr 1986 |
| 1065 | Euratex Corp | Glade Park, CO 81523 | Oil & Gas Operator | Sep 1996 |
| 1066 | Eureka Expl Co, Inc | | Oil Operator | Dec 2013 |
| 1067 | Eureka Gas Co, Inc | Pikeville, KY 41502 | Gas Operator | Dec 2010 |
| 1068 | Eureka Oil And Gas LLC | Columbus, OH 43230 | Oil Operator | Dec 2020 |
| 1069 | Eureka Prospecting Company | Wimberley, TX 78676 | Oil & Gas Operator | Jun 2023 |
| 1070 | Euroamerican Energy Group Inc | | Oil & Gas Operator | Oct 1993 |
| 1071 | Euroamerican Pet Corp | Columbus, OH 43229 | Gas Operator | Dec 1991 |
| 1072 | Euromin Canada, Inc. | | Oil & Gas Operator | Mar 1987 |
| 1073 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Apr 2025 |
| 1074 | Eurotex Royalty, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Aug 2003 |
| 1075 | Eurovest Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 1076 | Ev Fleming Enterprises, LLC | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2024 |
| 1077 | Evan Energy Co, LC | | Gas Operator | Dec 2013 |
| 1078 | Evanco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1987 |
| 1079 | Evangelical Free Church | | Oil & Gas Operator | Dec 1987 |
| 1080 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jan 2025 |
| 1081 | Evangeline Oil Prod. Co., Inc. | | Oil Operator | Apr 2001 |
| 1082 | Evangeline Operating Co., Inc. | | Oil Operator | Jun 1989 |
| 1083 | Evangeline Pumpers, Inc. | | Oil & Gas Operator | Jul 2005 |
| 1084 | Evangeline Trading Company | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 1085 | Evans / Heslet Operating | Tulsa, OK 74170 | Oil & Gas Operator | Aug 1999 |
| 1086 | Evans Brothers | | Oil & Gas Operator | Jan 2025 |
| 1087 | Evans Douglas G | | Oil Operator | Aug 1987 |
| 1088 | Evans Energy, LLC | Mount Hope, KS 67108 | Oil & Gas Operator | Dec 2024 |
| 1089 | Evans John Roy | | Oil Operator | Nov 1992 |
| 1090 | Evans Oil Company Inc | Eunice, NM 88231 | Oil & Gas Operator | Feb 2007 |
| 1091 | Evans Oil D W - | | Oil Operator | Mar 1992 |
| 1092 | Evans Oil Inc. | Lebo, KS 66856 | Oil Operator | Dec 2024 |
| 1093 | Evans Production Co. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2020 |
| 1094 | Evans Well Service | | Oil Operator | Oct 2013 |
| 1095 | Evans, Carl N. | Graham, TX 76450 | Oil & Gas Operator | Feb 2001 |
| 1096 | Evans, Glenn A. | Paola, KS 66071 | Oil Operator | Oct 1989 |
| 1097 | Evans, Jay - Oil Company | Iola, KS 66749 | Oil Operator | Apr 2001 |
| 1098 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 1099 | Evans, Ralph | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2011 |
| 1100 | Evans, S. Lavon Jr. Oper. Co. | Laurel, MS 39442 | Oil & Gas Operator | Apr 2025 |