| 1 | Talos Energy Offshore LLC | | Oil & Gas Operator | Jan 2025 |
| 2 | Talos Gulf Coast Onshore LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 3 | Talos Third Coast LLC | | Oil & Gas Operator | Dec 2024 |
| 4 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 5 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jun 2025 |
| 6 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 7 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 8 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 9 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 10 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 11 | Tex-Con-Brehm-Basin Expl. | | Oil & Gas Operator | May 1990 |
| 12 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 13 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 14 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 15 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 16 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 17 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 18 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 19 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 20 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 21 | The WM G Helis Company, L.L.C. | | Oil & Gas Operator | Nov 2003 |
| 22 | Time Energy, L.L.C. | | Oil & Gas Operator | Nov 2020 |
| 23 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 24 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 25 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 26 | Torch Opr Co-Stone Petr Corp | | Oil & Gas Operator | Jul 1997 |
| 27 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 28 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 29 | Trigon Exploration, Inc. | | Oil & Gas Operator | Jan 1999 |
| 30 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |