| 401 | Ted Koble Operator | | Oil & Gas Operator | Nov 2007 |
| 402 | Tedco | | Gas Operator | Nov 1988 |
| 403 | Tedik Limited Partnership | Williamson, WV 25661-0000 | Gas Operator | Dec 2021 |
| 404 | Tee Cee'S Inc | Drumright, OK 74030 | Oil & Gas Operator | Dec 2025 |
| 405 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 406 | Teel 78 A | | Gas Operator | Dec 1980 |
| 407 | Teel 79a | | Gas Operator | Dec 1980 |
| 408 | Teepee Oil & Gas Inc | Yukon, OK 73085 | Oil Operator | Dec 2006 |
| 409 | Teg Midcontinent, Inc. | Aurora, CO 80014 | Oil Operator | Jul 2013 |
| 410 | Tega Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2012 |
| 411 | Tehi Illinois, LLC | Olney, IL 62450 | Oil & Gas Operator | Feb 2019 |
| 412 | Teichgraeber Oil | | Oil Operator | Nov 1995 |
| 413 | Teichgraeber Oil Co. | | Oil Operator | Dec 1994 |
| 414 | Teichgraeber Oil, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Dec 2024 |
| 415 | Tej Ventures | | Oil & Gas Operator | Dec 2002 |
| 416 | Tejas Gas Corp | | Oil & Gas Operator | Dec 1974 |
| 417 | Tejas Gas Pipeline Company | Houston, TX 77010 | Oil & Gas Operator | Apr 1998 |
| 418 | Tejas Gas Pipeline, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2002 |
| 419 | Tejas Jack Sales, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 420 | Tejas Operating Company, Inc. | Houston, TX 77257 | Oil & Gas Operator | May 1995 |
| 421 | Tejas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 422 | Tejas Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 423 | Tejas Permian Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 424 | Tejas Petroleum Resources, LLC | Aubrey, TX 76227 | Oil & Gas Operator | Feb 2026 |
| 425 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 426 | Tejas Trucking, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 427 | Tejas Western Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2018 |
| 428 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 429 | Teke Production LLC | Houston, TX 77269 | Oil Operator | Feb 2026 |
| 430 | Tekenergy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 431 | Tekna Synergy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 432 | Teko Oil & Gas I | | Oil Operator | Aug 1992 |
| 433 | Teleo Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2009 |
| 434 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 435 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 436 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 437 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 438 | Tellus Operating Group, LLC | | Oil & Gas Operator | Nov 2025 |
| 439 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 440 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 441 | Tema Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2009 |
| 442 | Temagami Oil & Gas LTD | | Oil & Gas Operator | May 2007 |
| 443 | Tember Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 444 | Temblor Petroleum Co. LLC | | Oil & Gas Operator | Nov 2025 |
| 445 | Temescal Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 446 | Temex Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 447 | Tempel Contracting, Inc. | Joplin, MT 59531 | Gas Operator | Nov 2025 |
| 448 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 449 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 450 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2025 |
| 451 | Temple & Roark | | Oil & Gas Operator | Sep 1981 |
| 452 | Temple Oil & Gas Co | Crooksville, OH 43731 | Oil & Gas Operator | Dec 2024 |
| 453 | Temple Oil Co | | Oil & Gas Operator | Oct 1992 |
| 454 | Temple Resources LLC | | Oil Operator | Nov 2025 |
| 455 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 456 | Templeton Oil, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 457 | Tempo Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 458 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 459 | Ten A Coal Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2020 |
| 460 | Ten Grand Energy Company Inc | Nachogdoches, TX 75963-1880 | Oil Operator | Mar 2011 |
| 461 | Tenaska Res LLC | Canonsburg, PA 15317 | Gas Operator | May 2020 |
| 462 | Tend Oil Inc. | Tyler, TX 75703 | Oil & Gas Operator | Jul 1995 |
| 463 | Tender Equity Corporation | Marietta, OH 45750 | Oil & Gas Operator | Dec 2007 |
| 464 | Tenex Corporation | Houston, TX 77227 | Oil & Gas Operator | Dec 2007 |
| 465 | Tenex Oil Corpor | | Oil Operator | May 1991 |
| 466 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 467 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Sep 2025 |
| 468 | Tenison Oil Comp | | Oil Operator | Jan 1993 |
| 469 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Nov 2025 |
| 470 | Tenk, Lawrence O. | Ottawa, KS 66067 | Oil & Gas Operator | Oct 1998 |
| 471 | Tenmile Land Limited Liability Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 472 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 473 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 474 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Nov 2025 |
| 475 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 476 | Tenneco West, Inc. | | Oil & Gas Operator | Dec 1983 |
| 477 | Tennessee Gas Pipeline Company | | Oil & Gas Operator | Dec 2011 |
| 478 | Tennessee Gas Pipeline Company, LLC | | Oil Operator | Dec 2024 |
| 479 | Tennessee Properties, Inc | | Oil Operator | Dec 2014 |
| 480 | Tenney, Donnie R. | Tallmansville, WV 26237-0000 | Gas Operator | Jan 2021 |
| 481 | Tennyson Oil & Gas | Muskogee, OK 74401 | Oil Operator | Nov 2025 |
| 482 | Tenpas, Bruce | Clymer, NY 14724 | Gas Operator | Dec 2024 |
| 483 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 484 | Tensas Delta Explo. Co., LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 485 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 486 | Tensas Exploraton & Production Co LLC | | Oil & Gas Operator | Nov 2009 |
| 487 | Teocali Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 488 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2025 |
| 489 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 490 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 491 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 492 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 493 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 494 | Ter Ex Inc | Butler, PA 16002-8638 | Gas Operator | Dec 1994 |
| 495 | Terex Energy Corporation | Casper, WY 82602 | Oil & Gas Operator | Aug 2019 |
| 496 | Terhune Harry C | Bartlesville, OK 74003 | Oil Operator | Feb 1997 |
| 497 | Terhune Opal S | Bartlesville, OK 74006-0472 | Oil Operator | Apr 2025 |
| 498 | Term Energy Corp. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2021 |
| 499 | Termo Company Of Texas | | Oil & Gas Operator | Dec 1986 |
| 500 | Terra Energy Co LLC | | Oil & Gas Operator | Apr 2018 |