| 28401 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 28402 | Tess Oil Company | Borger, TX 79008 | Oil & Gas Operator | Mar 2008 |
| 28403 | Tessara Petroleum Resources, LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 28404 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 28405 | Testco Production Company | Watonga, OK 73772-0589 | Oil & Gas Operator | Aug 2013 |
| 28406 | Tesuque Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Jun 2026 |
| 28407 | Tet Energy | | Oil Operator | Feb 2026 |
| 28408 | Teton Energy Co Inc | Denver, CO 80239 | Oil Operator | Dec 1983 |
| 28409 | Teton Petroleum Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jun 2026 |
| 28410 | Tetra Oil Company | | Oil & Gas Operator | Dec 2025 |
| 28411 | Tetragon Investments, LLC | Abilene, TX 79604 | Oil Operator | Jul 2014 |
| 28412 | Tettleton, Jon Otis | Nocona, TX 76255 | Oil & Gas Operator | Aug 2003 |
| 28413 | Tettleton, Steven B. | Nocona, TX 76255 | Oil Operator | Jun 2026 |
| 28414 | Tevebaugh MGMT Co | Baden, PA 15005-0123 | Oil & Gas Operator | Dec 2002 |
| 28415 | Tex-Am Petroleum Corp. | Eastland, TX 76448 | Oil & Gas Operator | Jun 2026 |
| 28416 | Tex-Am-Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 28417 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 28418 | Tex-Atic Resources, Inc. | S. Lake Tahoe, CA 96150 | Oil & Gas Operator | Jun 2026 |
| 28419 | Tex-Hio Energy | Terrell, TX 75156 | Oil & Gas Operator | Dec 1997 |
| 28420 | Tex-Lee Operating Company | Giddings, TX 78942 | Oil & Gas Operator | Jun 2026 |
| 28421 | Tex-Oak, Inc. | Oklahoma City, OK 73155 | Oil & Gas Operator | Dec 1995 |
| 28422 | Tex-Ok Energy, Limited Partnership | Cody, WY 82414 | Oil & Gas Operator | Mar 2026 |
| 28423 | Tex-Ok Energy, LTD Partnership | Cody, WY 82414 | Oil & Gas Operator | Jun 2026 |
| 28424 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 28425 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Mar 2026 |
| 28426 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 28427 | Texacal, Inc. | Newport Beach, CA 92660 | Oil & Gas Operator | Jun 2026 |
| 28428 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Jun 2026 |
| 28429 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 28430 | Texaco Exploration & Prod | Midland, TX 79702 | Oil & Gas Operator | Aug 2002 |
| 28431 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Feb 2026 |
| 28432 | Texaco Exploration & Production Inc N W | Farmington, NM 87401 | Oil & Gas Operator | Aug 1995 |
| 28433 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 28434 | Texaco Inc & A.C. Glassell Jr | | Oil & Gas Operator | Aug 1980 |
| 28435 | Texaco Oils Inc | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 28436 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 28437 | Texaco Seaboard, Inc. | | Gas Operator | Sep 1980 |
| 28438 | Texaco USA - Mor | | Oil Operator | Aug 1988 |
| 28439 | Texada Resources, Inc. | | Oil & Gas Operator | Dec 1992 |
| 28440 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 28441 | Texakoma Exploration & Production LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 28442 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 28443 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 28444 | Texakoma Opr LP | Plano, TX 75024-6679 | Oil & Gas Operator | Dec 2012 |
| 28445 | Texakota | | Oil & Gas Operator | Mar 1995 |
| 28446 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 28447 | Texan Petroleum Corporation | Dallas, TX 75204 | Oil & Gas Operator | Oct 2004 |
| 28448 | Texan Production | Pearsall, TX 78061 | Oil & Gas Operator | Aug 2003 |
| 28449 | Texan Production Company, Inc. | Canyon Lake, TX 78133 | Oil & Gas Operator | Jun 2026 |
| 28450 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Jun 2026 |
| 28451 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 28452 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Jun 2026 |
| 28453 | Texas City Refining, Inc. | | Oil & Gas Operator | Nov 1988 |
| 28454 | Texas Coastal Resources LLC | Fairhope, AL 36532 | Oil Operator | Jun 2026 |
| 28455 | Texas Concho Operating Co. | Eldorado, TX 76936 | Oil & Gas Operator | Mar 1999 |
| 28456 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2026 |
| 28457 | Texas Crude & Dale Gas Expl | | Oil & Gas Operator | Dec 1984 |
| 28458 | Texas Crude Energy, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 2012 |
| 28459 | Texas Crude Exploration Inc | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 28460 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 28461 | Texas Crude Oil Co. Et Al | | Oil & Gas Operator | May 1992 |
| 28462 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 28463 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 28464 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 28465 | Texas Crude-Rebstock & Reeves | | Oil & Gas Operator | Feb 1980 |
| 28466 | Texas Crude-Wainoco-Hilliard | | Oil & Gas Operator | Jul 1978 |
| 28467 | Texas Eastern Skyline Oil | Houston, TX 77252 | Oil & Gas Operator | Jan 1987 |
| 28468 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 28469 | Texas Energen Inc. | Austin, TX 78731 | Oil & Gas Operator | Jun 2026 |
| 28470 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 28471 | Texas Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 28472 | Texas Energy & Environmental | Houston, TX 77070 | Oil & Gas Operator | Nov 1998 |
| 28473 | Texas Energy & Environmental Inc | Houston, TX 77269 | Oil & Gas Operator | Oct 1998 |
| 28474 | Texas Energy Mutual LLC | Grapevine, TX 76051-8145 | Oil Operator | Jun 2018 |
| 28475 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 2026 |
| 28476 | Texas Energy Sources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Mar 2008 |
| 28477 | Texas Energy Trust Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2016 |
| 28478 | Texas Exploration & Prod. Co. | Gainesville, TX 76240 | Oil & Gas Operator | Apr 1996 |
| 28479 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Jun 2026 |
| 28480 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 28481 | Texas Gas Resources, Inc. | Houston, TX 77292 | Oil & Gas Operator | Jul 2009 |
| 28482 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 28483 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 28484 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 28485 | Texas Green Energy Services LLC | Richmond, TX 77407 | Oil Operator | Jun 2026 |
| 28486 | Texas Gulf Gas Corporation | Fayetteville, TX 78940 | Oil & Gas Operator | Jun 2005 |
| 28487 | Texas Hydrogen Energy Corp. | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 28488 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 28489 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 28490 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 28491 | Texas Independent Exploration LP | Houston, TX 77024 | Oil & Gas Operator | Mar 2017 |
| 28492 | Texas Independent Oil Co., LLC | Argyle, TX 76226 | Oil & Gas Operator | Jun 2026 |
| 28493 | Texas International Oper., LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2013 |
| 28494 | Texas International Resource LLC | Allen, TX 75013 | Oil Operator | Jun 2026 |
| 28495 | Texas Investments | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 28496 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 28497 | Texas Land & Petro Co., LLC | Carrollton, TX 75010 | Oil & Gas Operator | Jun 2026 |
| 28498 | Texas Land & Trading Co, Inc. | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 28499 | Texas Lone Star Petroleum Corp. | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2013 |
| 28500 | Texas M.O.R., Inc. | Corsicana, TX 75109 | Oil Operator | Sep 2013 |