| 1 | T & P Exploration | Addison, TX 75006 | Oil & Gas Operator | Aug 1993 |
| 2 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 3 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 4 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 5 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 6 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Dec 2025 |
| 7 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 8 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 9 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Nov 2025 |
| 10 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 11 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2025 |
| 12 | Tekenergy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 13 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Nov 2025 |
| 14 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 15 | Tex-Ok Energy, Limited Partnership | Cody, WY 82414 | Oil & Gas Operator | Dec 2025 |
| 16 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 17 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 18 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 19 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 20 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 21 | Texas Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 22 | Texas Energy Associates | Graham, TX 76450 | Oil & Gas Operator | Nov 1999 |
| 23 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 24 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 25 | Texocan Minerals Inc | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2000 |
| 26 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 27 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Dec 2025 |
| 28 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 29 | Thompson Operating Co. | Abernathy, TX 79311 | Oil & Gas Operator | Aug 1994 |
| 30 | Thompson Roy G | Bartlesville, OK 74006 | Oil & Gas Operator | Feb 1993 |
| 31 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 32 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 33 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Dec 2025 |
| 34 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2025 |
| 35 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 36 | Tomlinson Oil Co Inc | Great Bend, KS 67530 | Oil & Gas Operator | May 2025 |
| 37 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 38 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 39 | Trailhead Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 40 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 41 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 42 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Dec 2025 |
| 43 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 44 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 45 | Triumph Resources Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2004 |
| 46 | Trueblood Resources, Inc. | Denver, CO 80222 | Oil & Gas Operator | Feb 2026 |
| 47 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Dec 2025 |
| 48 | Tulum Corporation | Oklahoma City, OK 73101-0125 | Oil & Gas Operator | Feb 2025 |
| 49 | Twain Energy LLC | Ridgeland, MS 39157 | Oil & Gas Operator | Dec 2025 |
| 50 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 51 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |