| 1 | E Texas Production MGMT Co Inc | | Oil & Gas Operator | Oct 1996 |
| 2 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 3 | E. Conway Butts, Inc. | | Oil & Gas Operator | Apr 1991 |
| 4 | E. G. Williamson, Jr. | | Oil Operator | Jan 1993 |
| 5 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | May 2026 |
| 6 | Eads Operating Company | | Oil & Gas Operator | Mar 1991 |
| 7 | Eagle Oil Management Co., LLC | | Oil & Gas Operator | Jan 2023 |
| 8 | Earl Dyess | | Oil & Gas Operator | Jul 1990 |
| 9 | Earl W Todd | | Oil Operator | Jan 2008 |
| 10 | Eason Petroleum Company | | Oil & Gas Operator | Jul 2016 |
| 11 | East Texas Exploration, LLC | Edmond, OK 73003 | Oil & Gas Operator | Sep 2019 |
| 12 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 13 | Egh Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 14 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 15 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2026 |
| 16 | Eleuterius Company | | Oil Operator | Jan 1983 |
| 17 | Elgie Company, Inc. | | Oil & Gas Operator | Aug 1993 |
| 18 | Elgin Energy Corp. | | Oil Operator | May 1995 |
| 19 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 20 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 21 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 22 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 23 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 24 | Encore Operating Louisiana, LLC | | Oil & Gas Operator | Dec 2010 |
| 25 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 26 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 27 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 28 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 29 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 30 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 31 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2026 |
| 32 | Energy Prod Management Corp | | Oil & Gas Operator | Oct 1991 |
| 33 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 34 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 35 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 36 | Engeo Co. | | Oil & Gas Operator | Nov 1986 |
| 37 | English Oil & Gas | | Oil Operator | Sep 2021 |
| 38 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | May 2026 |
| 39 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 40 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 41 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 42 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 43 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 44 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 45 | Eram, Inc. | | Oil & Gas Operator | Dec 2024 |
| 46 | Ergon Exploration, Inc. | | Oil & Gas Operator | Jun 2023 |
| 47 | Erin Exploration Associates | | Oil & Gas Operator | Mar 1987 |
| 48 | Ernest Starkey, Jr. | | Oil & Gas Operator | Feb 1985 |
| 49 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 50 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 51 | Etc Field Services LLC | Dallas, TX 75225 | Oil Operator | Jun 2018 |
| 52 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 53 | Etd Oil Co. | | Oil Operator | Oct 1990 |
| 54 | Ethredge & Rhoads Oil Company | | Oil Operator | Dec 2012 |
| 55 | Ethredge Oil Company | | Oil & Gas Operator | Aug 1998 |
| 56 | Ethyl Gas Company, LLC | | Oil Operator | Jan 2025 |
| 57 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 58 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 59 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 60 | Evergreen Operating Co., LTD. | McAllen, TX 78502 | Oil & Gas Operator | May 2026 |
| 61 | Excalibur Resources, Inc. | | Oil & Gas Operator | Apr 1986 |
| 62 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2026 |
| 63 | Excelsior Oil Corporation | | Oil & Gas Operator | May 1985 |
| 64 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | May 2026 |
| 65 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 66 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |