| 4401 | SW Associates | | Oil & Gas Operator | Dec 1985 |
| 4402 | Swag Oil And Gas Company, Inc. | | Oil & Gas Operator | Jul 1982 |
| 4403 | Swampfox Oilfield Services, LLC | | Oil & Gas Operator | Dec 2024 |
| 4404 | Swan Lake Properties, Inc. | | Oil Operator | Jul 1987 |
| 4405 | SWD Acidizing, Inc. | | Oil Operator | Feb 2014 |
| 4406 | SWD, Inc. | | Oil Operator | Jan 2025 |
| 4407 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 4408 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 4409 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 4410 | SWN Production (Louisiana), LLC | | Oil & Gas Operator | Dec 2024 |
| 4411 | SWN Production Company, LLC | Spring, TX 77391 | Oil & Gas Operator | Jun 2025 |
| 4412 | Sydson D'Oro Expl. Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 4413 | Sylvan Energy, LLC | Pittsburgh, PA 15211 | Oil & Gas Operator | Sep 2025 |
| 4414 | Synergy Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2019 |
| 4415 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |
| 4416 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 4417 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 4418 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 4419 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 4420 | T & L Production Company | | Oil Operator | Feb 1984 |
| 4421 | T & M Gauging | | Oil Operator | Oct 2006 |
| 4422 | T & R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 4423 | T H Production Co. | | Oil & Gas Operator | Mar 1994 |
| 4424 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 4425 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 4426 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 4427 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Sep 2025 |
| 4428 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 4429 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 4430 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 4431 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 4432 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 4433 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 4434 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 4435 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 4436 | T. N. T. Inc. | | Oil & Gas Operator | Jan 1987 |
| 4437 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 4438 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Jul 2025 |
| 4439 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 4440 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 4441 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 4442 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 4443 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 4444 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 4445 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 4446 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |
| 4447 | Tadlock Properites | | Oil & Gas Operator | Jan 1994 |
| 4448 | Taggart Oil Co., Inc. | | Oil Operator | Oct 1992 |
| 4449 | Tahoe Corporation | | Gas Operator | Feb 2023 |
| 4450 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 4451 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 4452 | Tallgrass Production Company LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2014 |
| 4453 | Talos Energy Offshore LLC | | Oil & Gas Operator | Jan 2025 |
| 4454 | Talos Ert LLC | | Oil & Gas Operator | Jan 2025 |
| 4455 | Talos Gulf Coast Onshore LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 4456 | Talos Third Coast LLC | | Oil & Gas Operator | Dec 2024 |
| 4457 | Tammany Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 4458 | Tana Exploration Company LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2021 |
| 4459 | Tanner Oil, Inc | | Oil & Gas Operator | Nov 2024 |
| 4460 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 4461 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 4462 | Target Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2011 |
| 4463 | Tarpon Oil Of Texas | | Oil & Gas Operator | Aug 1994 |
| 4464 | Tatco, Inc. | | Oil & Gas Operator | May 1991 |
| 4465 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 4466 | Taurus Petr-Fieldcrest Petr | | Oil & Gas Operator | Apr 1989 |
| 4467 | Taurus Petroleum | | Oil & Gas Operator | Jul 1987 |
| 4468 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 4469 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 4470 | TBR Operating Company Inc. | | Gas Operator | Dec 2024 |
| 4471 | Tchefuncte Natural Resources, L.L.C. | | Oil & Gas Operator | Aug 2011 |
| 4472 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 4473 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 4474 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4475 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 4476 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Sep 2025 |
| 4477 | Tebco Oil & Gas | | Oil & Gas Operator | Sep 1996 |
| 4478 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 4479 | Tedco | | Gas Operator | Nov 1988 |
| 4480 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 4481 | Teel 78 A | | Gas Operator | Dec 1980 |
| 4482 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 4483 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 4484 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 4485 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4486 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jun 2025 |
| 4487 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Sep 2025 |
| 4488 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 4489 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4490 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 4491 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 4492 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Jun 2025 |
| 4493 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 4494 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2025 |
| 4495 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 4496 | Tennessee Gas Pipeline Company | | Oil & Gas Operator | Dec 2011 |
| 4497 | Tennessee Gas Pipeline Company, LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 4498 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 4499 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 4500 | Tensas Exploraton & Production Co LLC | | Oil & Gas Operator | Nov 2009 |