| 1 | T&R Energy Services | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 2 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 3 | Taylor, Gordon Oil Company | Sunray, TX 79086 | Oil & Gas Operator | Apr 1996 |
| 4 | Taylor, Gordon Oil Company, LP | Sunray, TX 79086 | Oil & Gas Operator | Feb 2014 |
| 5 | TB Operating, LLC | Borger, TX 79008 | Oil & Gas Operator | Jun 2018 |
| 6 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Dec 2025 |
| 7 | Tecolote Energy Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 8 | Tess Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 9 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 10 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 11 | Texas Operating Partners LLC | Tomball, TX 77377 | Oil & Gas Operator | Dec 2025 |
| 12 | Texian Energy Corporation | Amarillo, TX 79120 | Oil & Gas Operator | Apr 1997 |
| 13 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 14 | The Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2007 |
| 15 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Oct 2025 |
| 16 | TJ Oil Company | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 17 | Tom Coble Oil & Gas LP | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2025 |
| 18 | Toney, W.L. | Borger, TX 79007 | Oil & Gas Operator | Oct 2012 |
| 19 | Topper Oil Company | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 20 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 21 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Dec 2025 |
| 22 | Trojan Oil And Gas | White Deer, TX 79097 | Oil & Gas Operator | Dec 1994 |
| 23 | Tryma Operating | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 24 | TTL Energy Resources, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2013 |