| 4601 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 4602 | Three D Petroleum LLC | | Oil Operator | Dec 2024 |
| 4603 | Three S & T Oil Co., Inc. | | Oil & Gas Operator | May 1985 |
| 4604 | Three Sisters Investments, LTD | | Oil & Gas Operator | Oct 1989 |
| 4605 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2025 |
| 4606 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 4607 | THT Operating Company | | Oil & Gas Operator | Jul 1990 |
| 4608 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 4609 | Tideland Industries, Inc. | | Oil & Gas Operator | Dec 1989 |
| 4610 | Tideway Oil Programs, Inc. | | Oil & Gas Operator | Oct 1980 |
| 4611 | Tierra Petroleum Corp. | | Oil & Gas Operator | Jun 1987 |
| 4612 | Tigco Oil & Gas Co., Inc. | | Oil & Gas Operator | Nov 2014 |
| 4613 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 4614 | Tiger Oil International, Inc | | Oil & Gas Operator | Dec 1978 |
| 4615 | Tiger Petroleum | | Oil Operator | Sep 2002 |
| 4616 | Tigner Walker | | Oil & Gas Operator | Dec 2021 |
| 4617 | Tigner Walker Et Al | | Oil & Gas Operator | Aug 2000 |
| 4618 | Tillman A. Rousse | | Oil Operator | Jan 1990 |
| 4619 | Tillman A. Rousse, Inc. | | Oil Operator | Apr 2001 |
| 4620 | Tillman J. McIntyre | | Oil Operator | Dec 1987 |
| 4621 | Tim Brookover | | Oil & Gas Operator | Dec 2005 |
| 4622 | Time Energy, L.L.C. | | Oil & Gas Operator | Nov 2020 |
| 4623 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 4624 | Tipco Operating Co. | Marshall, TX 75671 | Oil & Gas Operator | Jul 2025 |
| 4625 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 4626 | Titan Oil Corp. | | Oil & Gas Operator | Jan 2025 |
| 4627 | Tma Production, LLC | | Oil Operator | Dec 2024 |
| 4628 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Jul 2025 |
| 4629 | TNC Energy, LLC | Lubbock, TX 79401 | Oil & Gas Operator | Nov 2016 |
| 4630 | Toc, Inc. (TN) | | Oil Operator | Apr 1995 |
| 4631 | Toce Energy, L.L.C. | | Oil & Gas Operator | Dec 2017 |
| 4632 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 4633 | Todd Bertolet | | Gas Operator | Apr 1999 |
| 4634 | Todd Oil Corp. Of La. Inc. | | Oil & Gas Operator | Jul 2000 |
| 4635 | Todd Oil Production Co | | Oil Operator | Aug 2001 |
| 4636 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Jul 2025 |
| 4637 | Tolar Corporation | | Oil & Gas Operator | Sep 1999 |
| 4638 | Tolar Energy, L.L.C. | | Oil & Gas Operator | Dec 2001 |
| 4639 | Tolbert & Associates | | Oil Operator | Dec 2024 |
| 4640 | Tolbert Et Al | | Oil Operator | Jun 2000 |
| 4641 | Tolbert Well Service | | Oil Operator | Jan 2025 |
| 4642 | Toledo Bend Well Service | | Oil Operator | Aug 2000 |
| 4643 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 4644 | Tom Littlepage Oil Properties | | Oil & Gas Operator | Dec 1984 |
| 4645 | Tom Moore Trustee | | Oil Operator | Apr 1986 |
| 4646 | Tom West | | Oil & Gas Operator | Nov 1989 |
| 4647 | Tomlinson Oil Co. Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2025 |
| 4648 | Tommy A. Paul | | Oil Operator | Oct 2020 |
| 4649 | Tommy Joe Jenny | | Gas Operator | Nov 2024 |
| 4650 | Topaz Oil Company | Diboll, TX 75941 | Oil & Gas Operator | Apr 1994 |
| 4651 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 4652 | Torch Oil & Gas Company | Houston, TX 77010 | Oil & Gas Operator | Aug 1997 |
| 4653 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 4654 | Torch Opr Co-Stone Petr Corp | | Oil & Gas Operator | Jul 1997 |
| 4655 | Torrid Energy Company | | Oil & Gas Operator | Jun 1988 |
| 4656 | Tortuga Operating Company | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 4657 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 4658 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 4659 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 4660 | Touchstone Properties, Inc. | | Oil Operator | Mar 1988 |
| 4661 | Trace Operators, Inc. | | Oil & Gas Operator | Nov 2024 |
| 4662 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 4663 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 4664 | Tradestar Energy, Inc. | Hot Springs, AR 71913 | Oil Operator | Feb 2021 |
| 4665 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 4666 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 4667 | Traillour Oil Co. | | Oil & Gas Operator | Mar 1990 |
| 4668 | Trans Ocean Oil, Inc. | Houston, TX 77252 | Oil & Gas Operator | Sep 1980 |
| 4669 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 4670 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 4671 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 4672 | Trans-Western Expl. Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 4673 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 4674 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 4675 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 4676 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 4677 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 4678 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 4679 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 4680 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 4681 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 4682 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 4683 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 4684 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 4685 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 4686 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 4687 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 4688 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Jul 2025 |
| 4689 | Trendsetter Production Co, Inc | | Oil & Gas Operator | Jul 2008 |
| 4690 | Tri Investment Company | | Oil Operator | Mar 1980 |
| 4691 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 4692 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 4693 | Tri-Par Exploration, Inc. | | Oil Operator | Oct 2001 |
| 4694 | Tri-Production Company | | Oil Operator | Apr 1994 |
| 4695 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 4696 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 4697 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 4698 | Triad Energy Corp. Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 4699 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 4700 | Triangle Oil & G G Cornwell | | Oil & Gas Operator | Nov 1981 |