| 1 | T & B Resources | | Oil & Gas Operator | Jul 1990 |
| 2 | T & F Oil Company | | Oil Operator | Jan 2025 |
| 3 | T & F Oil Company, LLC | | Oil Operator | Oct 2011 |
| 4 | T & L Oil Production | | Oil Operator | Jan 2025 |
| 5 | T & L Production Company | | Oil Operator | Feb 1984 |
| 6 | T & M Gauging | | Oil Operator | Oct 2006 |
| 7 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 8 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 9 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Dec 2024 |
| 10 | T-R Oil | Mapleton, KS 66754 | Oil & Gas Operator | May 2018 |
| 11 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Apr 2026 |
| 12 | T. C. Morrow Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 13 | T. D. Tedder | | Oil Operator | Dec 1991 |
| 14 | T. J. Guido | | Oil & Gas Operator | Oct 1998 |
| 15 | T. J. Lundy | | Oil Operator | Jan 2025 |
| 16 | T. J. Operating Co., Inc. | | Oil & Gas Operator | Aug 1998 |
| 17 | T. L. James & Co., Inc. | | Oil & Gas Operator | Oct 1992 |
| 18 | T. M. Hopkins | | Oil & Gas Operator | Aug 2007 |
| 19 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 20 | T. N. T. Tribal - Luffey | | Gas Operator | Oct 1994 |
| 21 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Feb 2026 |
| 22 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 23 | T. West Bullock, SR. | | Oil & Gas Operator | Mar 1989 |
| 24 | T.B. Lanford Et Al | | Oil Operator | Apr 1987 |
| 25 | T.O. Greer Productions | | Oil & Gas Operator | Aug 2013 |
| 26 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 27 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 28 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 29 | Tabco Producing Co. | | Oil & Gas Operator | Jan 1998 |
| 30 | Tadlock Properites | | Oil & Gas Operator | Jan 1994 |
| 31 | Taggart Oil Co., Inc. | | Oil Operator | Oct 1992 |
| 32 | Tahoe Corporation | | Gas Operator | Feb 2023 |
| 33 | Talco Midstream Assets, LTD. | | Oil Operator | May 2017 |
| 34 | Talley Resources, Inc. | Houma, LA 70360 | Oil & Gas Operator | Apr 1993 |
| 35 | Tallgrass Production Company LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2014 |
| 36 | Talos Energy Offshore LLC | | Oil & Gas Operator | Jan 2025 |
| 37 | Talos Ert LLC | | Oil & Gas Operator | Jan 2025 |
| 38 | Talos Gulf Coast Onshore LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 39 | Talos Third Coast LLC | | Oil & Gas Operator | Dec 2024 |
| 40 | Tammany Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 41 | Tana Exploration Company LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2021 |
| 42 | Tanner Oil, Inc | | Oil & Gas Operator | Nov 2024 |
| 43 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 44 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 45 | Target Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2011 |
| 46 | Tarpon Oil Of Texas | | Oil & Gas Operator | Aug 1994 |
| 47 | Tatco, Inc. | | Oil & Gas Operator | May 1991 |
| 48 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 49 | Taurus Petr-Fieldcrest Petr | | Oil & Gas Operator | Apr 1989 |
| 50 | Taurus Petroleum | | Oil & Gas Operator | Jul 1987 |
| 51 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 52 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 53 | TBR Operating Company Inc. | | Gas Operator | Dec 2024 |
| 54 | Tchefuncte Natural Resources, L.L.C. | | Oil & Gas Operator | Aug 2011 |
| 55 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 56 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 57 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 58 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 59 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Apr 2026 |
| 60 | Tebco Oil & Gas | | Oil & Gas Operator | Sep 1996 |
| 61 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 62 | Tedco | | Gas Operator | Nov 1988 |
| 63 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 64 | Teel 78 A | | Gas Operator | Dec 1980 |
| 65 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 66 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 67 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 68 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 69 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jan 2026 |
| 70 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Apr 2026 |
| 71 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 72 | Temex Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 73 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 74 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 75 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Jan 2026 |
| 76 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 77 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 78 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 79 | Tennessee Gas Pipeline Company | | Oil & Gas Operator | Dec 2011 |
| 80 | Tennessee Gas Pipeline Company, LLC | | Oil Operator | Dec 2024 |
| 81 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 82 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 83 | Tensas Exploraton & Production Co LLC | | Oil & Gas Operator | Nov 2009 |
| 84 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 85 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 86 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 87 | Termo Company Of Texas | | Oil & Gas Operator | Dec 1986 |
| 88 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 89 | Terral D Hinds | | Oil Operator | Mar 2012 |
| 90 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 91 | Terronne Petroleum Corporation | | Oil & Gas Operator | Nov 2024 |
| 92 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 93 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 94 | Tervita, LLC | | Oil Operator | May 2021 |
| 95 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 96 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 97 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 98 | Tex-Con-Brehm-Basin Expl. | | Oil & Gas Operator | May 1990 |
| 99 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 100 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Apr 2026 |