| 1 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 2 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 3 | Eaa Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 4 | Eagle Exploration Co., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2019 |
| 5 | Eagle Operating | Midland, TX 79707 | Oil & Gas Operator | May 2013 |
| 6 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 7 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 8 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 9 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 10 | Ehrlich, Mitchell | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 11 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 12 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 13 | Empire Operating, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 14 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 15 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2019 |
| 16 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 17 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 18 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 19 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 21 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 22 | Eqv Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Oct 2025 |
| 23 | Estes And Company LLC. | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 24 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 25 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 26 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 27 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 28 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 29 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 30 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 31 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |