| 1 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 2 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jan 2024 |
| 3 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 4 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 5 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 6 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 7 | TGNR TVL LLC | | Oil & Gas Operator | Dec 2023 |
| 8 | Tierra Petroleum Corp. | | Oil & Gas Operator | Jun 1987 |
| 9 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 10 | Trans Ocean Oil, Inc. | Houston, TX 77252 | Oil & Gas Operator | Oct 1980 |
| 11 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 12 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 13 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 14 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 15 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2023 |