| 1 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 2 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jun 2025 |
| 3 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 4 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 5 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 6 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 7 | Texona Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 8 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 9 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 10 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 11 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Oct 2025 |
| 12 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 13 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 14 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 15 | Txo Prod Corp.-Arkla Expl. Co. | | Oil & Gas Operator | Dec 1990 |
| 16 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 17 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |