| 1 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 2025 |
| 2 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 3 | Barnett Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Oct 2025 |
| 4 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 5 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 6 | Blazer Resources, Inc. | Leesburg, TX 75451 | Oil & Gas Operator | Oct 2025 |
| 7 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 8 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 9 | Crow, David | Shreveport, LA 71106 | Oil & Gas Operator | May 2001 |
| 10 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 11 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 12 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 13 | Enbridge G & P (East Texas) L.P. | Houston, TX 77056 | Oil & Gas Operator | Sep 2018 |
| 14 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 15 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Oct 2025 |
| 16 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 17 | FGB Energy, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2017 |
| 18 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 19 | Hughey, Gaylord T. SR. Oper. Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1998 |
| 20 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 21 | Intercoast Oil And Gas | Tulsa, OK 74136 | Oil & Gas Operator | Mar 1997 |
| 22 | JKJ Oil Company | Austin, TX 78746 | Oil & Gas Operator | Jun 2007 |
| 23 | K&M Resources LLC | Artesia, NM 88211 | Oil & Gas Operator | Aug 2025 |
| 24 | Koch Midstream Services Company | Wichita, KS 67201 | Oil & Gas Operator | Oct 2000 |
| 25 | Krog Partners, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2025 |
| 26 | Linder, John Operating Co., LLC | Gladewater, TX 75647 | Oil & Gas Operator | Oct 2025 |
| 27 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 28 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 29 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 30 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 31 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 32 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 33 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 34 | Noble & Cantrell Expl. Co., Inc. | Winnsboro, TX 75494 | Oil & Gas Operator | Aug 2006 |
| 35 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 36 | Oil Management Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2022 |
| 37 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 38 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 39 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 40 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 41 | Prime Natural Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 2007 |
| 42 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 43 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | Oct 2025 |
| 44 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 45 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 46 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 47 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 48 | Saxet Operating Co.,Inc. | Madisonville, TX 77864 | Oil & Gas Operator | Oct 2025 |
| 49 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 50 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 51 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Oct 2025 |
| 52 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Oct 2025 |
| 53 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Oct 2025 |