| 1001 | Jug Enterprises | | Oil Operator | Jan 1988 |
| 1002 | Julana Oil & Gas | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2024 |
| 1003 | Julander Energy Company | Denver, CO 80614 | Oil Operator | Apr 2016 |
| 1004 | Juli, Donald W. | Auburn, NY 13021 | Gas Operator | Dec 2022 |
| 1005 | Julian Ard | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2002 |
| 1006 | Julil Energy, LLC | Richmond, TX 77406 | Oil & Gas Operator | Apr 2024 |
| 1007 | Julius Roy G | Wichita, KS 67206 | Oil & Gas Operator | Feb 2024 |
| 1008 | Julius Wactor Oil Co | | Oil & Gas Operator | Jan 1986 |
| 1009 | Jumbo American Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2010 |
| 1010 | Juna Operating Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 1996 |
| 1011 | Juna Operating, Inc. | Corsicana, TX 75151 | Oil & Gas Operator | Nov 2008 |
| 1012 | June Energy Inc. | | Oil & Gas Operator | May 2000 |
| 1013 | Juneau Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 1014 | Juniper Petroleum Corporation | | Oil & Gas Operator | Aug 1983 |
| 1015 | Juniper Resources Exploration Company, LLC | Farmington, NM 87402 | Oil & Gas Operator | Feb 2024 |
| 1016 | Juniper Resources Inc | | Oil Operator | Sep 2004 |
| 1017 | Juno Operating Company II LLC | Plano, TX 75093 | Oil & Gas Operator | Sep 2018 |
| 1018 | Juno Operating Company III, LLC | Plano, TX 75093 | Oil & Gas Operator | Apr 2024 |
| 1019 | Juno Operating Company, LLC | Plano, TX 75093 | Oil & Gas Operator | Jul 2011 |
| 1020 | Jupiter Energy LLC | Richmond, TX 77469 | Oil Operator | Apr 2024 |
| 1021 | Jupiter Oil Corp | | Oil & Gas Operator | Nov 2023 |
| 1022 | Jura Energy Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2023 |
| 1023 | Jurassic Energy Corporation | Crosby, TX 77532 | Oil & Gas Operator | Apr 2024 |
| 1024 | Jurassic Exploration Co Inc. | | Oil & Gas Operator | Nov 1994 |
| 1025 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Apr 2024 |
| 1026 | Jurassic Operating Company | Houston, TX 77099 | Oil & Gas Operator | Apr 2024 |
| 1027 | Jurassic Resources Development Na LLC | Bismarck, ND 58504-5835 | Gas Operator | Jan 2024 |
| 1028 | Just Oil | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 1029 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 1030 | Justice Oil & Gas LLC | Gillette, WY 82716 | Oil & Gas Operator | Feb 2024 |
| 1031 | Justice Oil Co | Hobbs, NM 88241 | Oil & Gas Operator | Dec 1996 |
| 1032 | Justin Energy Corporation | Wellsville, KS 66092 | Oil Operator | Dec 2023 |
| 1033 | Justiss Oil Co., Inc.-Munoco Co. | | Oil & Gas Operator | Dec 2008 |
| 1034 | Justiss Oil Co., Inc.-Munoco Co., L.C. | | Gas Operator | Mar 2001 |
| 1035 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Dec 2023 |
| 1036 | Justiss-Mears Oil Co. | | Oil & Gas Operator | Feb 1981 |
| 1037 | Justiss-Mears Oil Co., Et Al | | Oil & Gas Operator | Feb 1981 |
| 1038 | Justiss-Mears-D. Latimer | | Oil Operator | Mar 1979 |
| 1039 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 1040 | Jvo Petroleum Inc | Shawnee, OK 74801 | Oil & Gas Operator | Jul 1995 |
| 1041 | JW Energy Co., LTD | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 1042 | JW Exploration LLC Of Texas | Dallas, TX 75287-3329 | Oil & Gas Operator | Jun 2017 |
| 1043 | JWC Oil Operator, LLC | MC Queeney, TX 78123 | Oil Operator | May 2018 |
| 1044 | JWC Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 1045 | JWD Oil & Gas LLC | Oklahoma City, OK 73116-9039 | Oil Operator | Nov 2023 |
| 1046 | Jwimco LLC | Dallas, TX 75229 | Oil & Gas Operator | Jan 2024 |
| 1047 | JWR Exploration Inc. | | Oil & Gas Operator | Jul 1989 |
| 1048 | JWR Oil And Gas | | Oil Operator | Dec 2023 |
| 1049 | JXR Company | | Oil Operator | Dec 1991 |
| 1050 | JZJ Corporation | | Oil Operator | May 2010 |