| 1 | T E L Oil & Gas Corporation | Guymon, OK 73941 | Gas Operator | Aug 2025 |
| 2 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 3 | Taylor Energy Corporation | Amarillo, TX 79114 | Oil & Gas Operator | Feb 1999 |
| 4 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 5 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 6 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 7 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2025 |
| 8 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 9 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 10 | Texas Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 11 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 12 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 13 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 14 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Sep 2025 |
| 15 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Aug 2025 |
| 16 | Transpetco Transport Company | Shreveport, LA 71101-5370 | Oil Operator | Jun 2008 |
| 17 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2025 |
| 18 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 19 | Trueblood Resources, Inc. | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 20 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 21 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |