| 4401 | Tammany Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 4402 | Tana Exploration Company LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2021 |
| 4403 | Tanner Oil, Inc | | Oil & Gas Operator | Nov 2024 |
| 4404 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 4405 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 4406 | Target Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2011 |
| 4407 | Tarpon Oil Of Texas | | Oil & Gas Operator | Aug 1994 |
| 4408 | Tatco, Inc. | | Oil & Gas Operator | May 1991 |
| 4409 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 4410 | Taurus Petr-Fieldcrest Petr | | Oil & Gas Operator | Apr 1989 |
| 4411 | Taurus Petroleum | | Oil & Gas Operator | Jul 1987 |
| 4412 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 4413 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 4414 | TBR Operating Company Inc. | | Gas Operator | Dec 2024 |
| 4415 | Tchefuncte Natural Resources, L.L.C. | | Oil & Gas Operator | Aug 2011 |
| 4416 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 4417 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 4418 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4419 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 4420 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | May 2026 |
| 4421 | Tebco Oil & Gas | | Oil & Gas Operator | Sep 1996 |
| 4422 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 4423 | Tedco | | Gas Operator | Nov 1988 |
| 4424 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 4425 | Teel 78 A | | Gas Operator | Dec 1980 |
| 4426 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 4427 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 4428 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 4429 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4430 | Tellus Operating Group, LLC | | Oil & Gas Operator | Mar 2026 |
| 4431 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | May 2026 |
| 4432 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 4433 | Temex Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4434 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 4435 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 4436 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 4437 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 4438 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 4439 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 4440 | Tennessee Gas Pipeline Company | | Oil & Gas Operator | Dec 2011 |
| 4441 | Tennessee Gas Pipeline Company, LLC | | Oil Operator | Dec 2024 |
| 4442 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 4443 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 4444 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 4445 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 4446 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 4447 | Termo Company Of Texas | | Oil & Gas Operator | Dec 1986 |
| 4448 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 4449 | Terral D Hinds | | Oil Operator | Mar 2012 |
| 4450 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 4451 | Terronne Petroleum Corporation | | Oil & Gas Operator | Nov 2024 |
| 4452 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 4453 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 4454 | Tervita, LLC | | Oil Operator | May 2021 |
| 4455 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 4456 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 4457 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 4458 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 4459 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | May 2026 |
| 4460 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 4461 | Texaco Inc & A.C. Glassell Jr | | Oil & Gas Operator | Aug 1980 |
| 4462 | Texaco Oils Inc | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 4463 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 4464 | Texada Resources, Inc. | | Oil & Gas Operator | Dec 1992 |
| 4465 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 4466 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2026 |
| 4467 | Texas City Refining, Inc. | | Oil & Gas Operator | Nov 1988 |
| 4468 | Texas Crude & Dale Gas Expl | | Oil & Gas Operator | Dec 1984 |
| 4469 | Texas Crude Exploration Inc | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 4470 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 4471 | Texas Crude Oil Co. Et Al | | Oil & Gas Operator | May 1992 |
| 4472 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 4473 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 4474 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 4475 | Texas Crude-Rebstock & Reeves | | Oil & Gas Operator | Feb 1980 |
| 4476 | Texas Crude-Wainoco-Hilliard | | Oil & Gas Operator | Jul 1978 |
| 4477 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 4478 | Texas Energy & Environmental Inc | Houston, TX 77269 | Oil & Gas Operator | Oct 1998 |
| 4479 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 4480 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 4481 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 4482 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 4483 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 4484 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 4485 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 4486 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4487 | Texas Pacific Oil Co. | | Oil & Gas Operator | Dec 1980 |
| 4488 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 4489 | Texas T Oil Co. | | Oil & Gas Operator | Apr 1990 |
| 4490 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 4491 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | May 2026 |
| 4492 | Texegy Operating Company LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 4493 | Texex Petroleum Corporation | | Oil & Gas Operator | Dec 2024 |
| 4494 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | May 2026 |
| 4495 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 4496 | Texoil Company | | Oil & Gas Operator | Dec 2000 |
| 4497 | Texoma Production Co | | Oil & Gas Operator | Jun 1986 |
| 4498 | Texona Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 4499 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 4500 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |