| 1 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 2 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 3 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 4 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 5 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 6 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 7 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 8 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 9 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 10 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 11 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 12 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 13 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 14 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 15 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 16 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 17 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 18 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 19 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | May 2025 |
| 20 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 21 | Peak Energy Operating #2, LLC | Durango, CO 81301 | Oil & Gas Operator | Jun 2006 |
| 22 | Peak Operating Of Texas, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 23 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 24 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 25 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 26 | Price, W. H. | Granbury, TX 76048 | Oil & Gas Operator | Jun 2024 |
| 27 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 28 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 29 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 30 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 31 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 32 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 33 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 34 | Vanco Oil & Gas Corp. | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 35 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |