| 501 | Terra Energy LTD | | Oil & Gas Operator | Apr 2018 |
| 502 | Terra Energy LTD And Miller Energy Inc And Mille | | Gas Operator | Dec 1998 |
| 503 | Terra Exploration & Production Co. Inc. | | Oil & Gas Operator | Dec 2009 |
| 504 | Terra Locus Services | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 505 | Terra Max Energy | | Oil Operator | Mar 1986 |
| 506 | Terra Production Company | Okemah, OK 74859-5924 | Oil & Gas Operator | Apr 2020 |
| 507 | Terra Resc Incor | | Oil Operator | Mar 1986 |
| 508 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 509 | Terrace Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2013 |
| 510 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Feb 2026 |
| 511 | Terral D Hinds | | Oil Operator | Mar 2012 |
| 512 | Terrapet Corporation | | Oil & Gas Operator | Jun 2011 |
| 513 | Terrapin Energy LLC | Okmulgee, OK 74447 | Oil Operator | Dec 2025 |
| 514 | Terraquest Corporation | Edmond, OK 73034 | Oil & Gas Operator | Jul 1997 |
| 515 | Terrascan Drilling Corp | Dublin, OH 43017 | Oil Operator | Dec 2005 |
| 516 | Terrel Production Co | | Oil & Gas Operator | Sep 2025 |
| 517 | Terreland Corporation | Sunray, TX 79086 | Oil & Gas Operator | Oct 2004 |
| 518 | Terrell Oil & Gas Production Co. | Hamlin, TX 79520 | Oil & Gas Operator | Feb 2026 |
| 519 | Terrgin Oil & Gas LLC | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2021 |
| 520 | Terrick Resources | Midland, TX 79708 | Oil & Gas Operator | Jul 2005 |
| 521 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 522 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Jan 2026 |
| 523 | Terrol Energy In | | Oil Operator | Feb 1993 |
| 524 | Terrol Energy Incorporated | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 525 | Terronne Petroleum Corporation | | Oil & Gas Operator | Nov 2024 |
| 526 | Terry D Coan | Youngsville, PA 16371-3608 | Oil & Gas Operator | Dec 2021 |
| 527 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 528 | Terry Enterprises, Inc. | West Columbia, TX 77486 | Oil & Gas Operator | Feb 2026 |
| 529 | Terry Jack | Konawa, OK 74849-0337 | Oil Operator | Feb 2012 |
| 530 | Terry John Trust | Aurora, CO 80012-5112 | Oil & Gas Operator | May 2016 |
| 531 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 532 | Terry Pate | Hobbs, NM 88240 | Oil & Gas Operator | Jun 2006 |
| 533 | Terry Petroleum Company | Houston, TX 77270 | Oil & Gas Operator | Dec 1997 |
| 534 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 535 | Terry Sims & Associates, Inc. | | Oil Operator | Sep 2009 |
| 536 | Terry'S Roustabout Service, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2002 |
| 537 | Terry, Lewis D. | Olney, TX 76374 | Oil & Gas Operator | Sep 1995 |
| 538 | Terry, R. K. | West Columbia, TX 77486 | Oil & Gas Operator | Feb 2026 |
| 539 | Tervita, LLC | | Oil Operator | May 2021 |
| 540 | Terzan Energy II LLC | Chandler, OK 74834 | Oil & Gas Operator | Dec 2025 |
| 541 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 542 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 543 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 544 | Tesoro Petroleum | | Oil Operator | Mar 1982 |
| 545 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 546 | Tesoro-Bintliff | | Oil & Gas Operator | Nov 1982 |
| 547 | Tess Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 548 | Tessara Petroleum Resources, LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 549 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2025 |
| 550 | Testco Production Company | Watonga, OK 73772-0589 | Oil & Gas Operator | Aug 2013 |
| 551 | Tesuque Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Feb 2026 |
| 552 | Tet Energy | | Oil Operator | Aug 2025 |
| 553 | Teton Energy Co Inc | Denver, CO 80239 | Oil Operator | Dec 1983 |
| 554 | Teton Petroleum Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2026 |
| 555 | Tetra Oil Company | | Oil & Gas Operator | Nov 2025 |
| 556 | Tetragon Investments, LLC | Abilene, TX 79604 | Oil Operator | Jul 2014 |
| 557 | Tettleton, Jon Otis | Nocona, TX 76255 | Oil & Gas Operator | Aug 2003 |
| 558 | Tettleton, Steven B. | Nocona, TX 76255 | Oil Operator | Feb 2026 |
| 559 | Tevebaugh MGMT Co | Baden, PA 15005-0123 | Oil & Gas Operator | Dec 2002 |
| 560 | Tex-Am Petroleum Corp. | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 561 | Tex-Am-Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 562 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 563 | Tex-Atic Resources, Inc. | S. Lake Tahoe, CA 96150 | Oil & Gas Operator | Feb 2026 |
| 564 | Tex-Con-Brehm-Basin Expl. | | Oil & Gas Operator | May 1990 |
| 565 | Tex-Hio Energy | Terrell, TX 75156 | Oil & Gas Operator | Dec 1997 |
| 566 | Tex-Lee Operating Company | Giddings, TX 78942 | Oil & Gas Operator | Feb 2026 |
| 567 | Tex-Oak, Inc. | Oklahoma City, OK 73155 | Oil & Gas Operator | Dec 1995 |
| 568 | Tex-Ok Energy, Limited Partnership | Cody, WY 82414 | Oil & Gas Operator | Dec 2025 |
| 569 | Tex-Ok Energy, LTD Partnership | Cody, WY 82414 | Oil & Gas Operator | Feb 2026 |
| 570 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 571 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 572 | Tex-Well Oil & Gas Corp. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2003 |
| 573 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 574 | Texacal, Inc. | Newport Beach, CA 92660 | Oil & Gas Operator | Feb 2026 |
| 575 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 576 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 577 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 578 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 579 | Texaco Exploration & Production Inc N W | Farmington, NM 87401 | Oil & Gas Operator | Aug 1995 |
| 580 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 581 | Texaco Inc & A.C. Glassell Jr | | Oil & Gas Operator | Aug 1980 |
| 582 | Texaco Oils Inc | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 583 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 584 | Texaco Seaboard, Inc. | | Gas Operator | Sep 1980 |
| 585 | Texaco USA - Mor | | Oil Operator | Aug 1988 |
| 586 | Texada Resources, Inc. | | Oil & Gas Operator | Dec 1992 |
| 587 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 588 | Texakoma Exploration & Production LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 589 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 590 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 591 | Texakoma Opr LP | Plano, TX 75024-6679 | Oil & Gas Operator | Dec 2012 |
| 592 | Texakota | | Oil & Gas Operator | Mar 1995 |
| 593 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 594 | Texalta Oil And Gas Inc. | | Gas Operator | Dec 1990 |
| 595 | Texan Petroleum Corporation | Dallas, TX 75204 | Oil & Gas Operator | Oct 2004 |
| 596 | Texan Production | Pearsall, TX 78061 | Oil & Gas Operator | Aug 2003 |
| 597 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | Feb 2026 |
| 598 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2026 |
| 599 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 600 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |