| 1 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 2 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 3 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 4 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 5 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 6 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 7 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Dec 2025 |
| 8 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 9 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 10 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 11 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 12 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 13 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 14 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 15 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 16 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 17 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 18 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 19 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 20 | Tellus Operating Group, LLC | | Oil & Gas Operator | Sep 2025 |
| 21 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 22 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 23 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 24 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 25 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 26 | Tervita, LLC | | Oil Operator | May 2021 |
| 27 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 28 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 29 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 30 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 31 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 32 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | Dec 2025 |
| 33 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Dec 2025 |
| 34 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 35 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 36 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 37 | Thor Production Co. | | Oil Operator | May 1997 |
| 38 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Dec 2025 |
| 39 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 40 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2025 |
| 41 | Tigner Walker | | Oil & Gas Operator | Dec 2021 |
| 42 | Tigner Walker Et Al | | Oil & Gas Operator | Aug 2000 |
| 43 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 44 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 45 | Tma Production, LLC | | Oil Operator | Dec 2024 |
| 46 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Dec 2025 |
| 47 | Todd Oil Production Co | | Oil Operator | Aug 2001 |
| 48 | Tolbert & Associates | | Oil Operator | Dec 2024 |
| 49 | Tolbert Et Al | | Oil Operator | Jun 2000 |
| 50 | Tolbert Well Service | | Oil Operator | Jan 2025 |
| 51 | Tom Moore Trustee | | Oil Operator | Apr 1986 |
| 52 | Tommy A. Paul | | Oil Operator | Oct 2020 |
| 53 | Topaz Oil Company | Diboll, TX 75941 | Oil & Gas Operator | Apr 1994 |
| 54 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 55 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 56 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 57 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 58 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 59 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 60 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 61 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 62 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Dec 2025 |
| 63 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 64 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 65 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 66 | Triple L Operating Company LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 67 | Triple S Oil Company | | Oil & Gas Operator | Feb 1979 |
| 68 | Tristate Nla, LLC | | Oil Operator | Dec 2024 |
| 69 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 70 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 71 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Dec 2025 |
| 72 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 73 | Tyson Oil Co. | | Oil Operator | Jan 2025 |