| 30001 | Trachtenberg Daniel S | Houston, TX 77071 | Oil Operator | Sep 2025 |
| 30002 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Dec 2025 |
| 30003 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Dec 2025 |
| 30004 | Tracker Resource Dev III, LLC | Englewood, CO 80112 | Oil & Gas Operator | Jul 2021 |
| 30005 | Tracker Resource Development II, LLC | | Oil & Gas Operator | Feb 2011 |
| 30006 | Trackstar Energies LLC | Colorado Springs, CO 80919-3233 | Oil Operator | Mar 2023 |
| 30007 | Tracy & Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 30008 | Tracy Co. | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2022 |
| 30009 | Tracy Operating Co., LLC | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2025 |
| 30010 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Dec 2025 |
| 30011 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 30012 | Tradestar Energy, Inc. | Hot Springs, AR 71913 | Oil Operator | Feb 2021 |
| 30013 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 30014 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 30015 | Trafalgar House Oil & Gas Inc | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 30016 | Trahan Petroleum Inc | | Oil Operator | Sep 2025 |
| 30017 | Trail Mountain, Inc. | Artesia, NM 88210 | Oil & Gas Operator | Jan 2016 |
| 30018 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Oct 2025 |
| 30019 | Trail Ridge Energy PRTNS II LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jun 2017 |
| 30020 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Oct 2025 |
| 30021 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 30022 | Trailblazer Oil & Gas LLC | Goliad, TX 77963 | Oil & Gas Operator | Dec 2025 |
| 30023 | Trailhead Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 30024 | Traillour Oil Co. | | Oil & Gas Operator | Mar 1990 |
| 30025 | Trans Atlantic Ener Corp | Caldwell, OH 43724 | Oil & Gas Operator | Dec 1993 |
| 30026 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 30027 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 30028 | Trans Ocean Oil, Inc. | | Oil & Gas Operator | Sep 1980 |
| 30029 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 30030 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 30031 | Trans Resource D | | Oil Operator | May 1991 |
| 30032 | Trans Terra Corp Int'L | Amarillo, TX 79159-0370 | Oil & Gas Operator | Jul 1993 |
| 30033 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 30034 | Trans Texas Minerals Company | Austin, TX 78714 | Oil & Gas Operator | Aug 1999 |
| 30035 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 30036 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 30037 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 30038 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 30039 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Dec 2025 |
| 30040 | Trans-Texas Energy Group LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Jul 2015 |
| 30041 | Trans-Western Exploration Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 30042 | Trans-Western Operating Company | Golden, CO 80402 | Oil Operator | Jun 2025 |
| 30043 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 30044 | Transamerica Energy Corp. | Atlanta, GA 30356 | Oil & Gas Operator | Dec 2025 |
| 30045 | Transamerica Oil | | Oil & Gas Operator | Sep 1992 |
| 30046 | Transamerica Oil Corporation | Hutchinson, KS 67504 | Gas Operator | Mar 2025 |
| 30047 | Transamerican Energy LTD | Dallas, TX 75231-1075 | Oil & Gas Operator | Apr 2014 |
| 30048 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 30049 | Transamerican Natural Gas Corp. | Houston, TX 77032 | Oil & Gas Operator | Aug 2000 |
| 30050 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 30051 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 30052 | Transatlantic Petr (USA) Corp. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 30053 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 30054 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 30055 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 30056 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Sep 2025 |
| 30057 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 30058 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 30059 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 30060 | Transcontinental Oil & Gas Inc | Aurora, OH 44202 | Oil & Gas Operator | Dec 2024 |
| 30061 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 30062 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 30063 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 30064 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 30065 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 30066 | Transit Energy Inc | North Lawrence, OH 44666 | Oil & Gas Operator | Dec 2024 |
| 30067 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Dec 2025 |
| 30068 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 30069 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 30070 | Transpacific Energy, LLC | Katy, TX 77450 | Oil & Gas Operator | Dec 2025 |
| 30071 | Transpetco I | Shreveport, LA 71101 | Oil & Gas Operator | May 2009 |
| 30072 | Transpetco Transport Company | Shreveport, LA 71101-5370 | Oil Operator | Jun 2008 |
| 30073 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 30074 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 30075 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 30076 | Trap Rock Oil Company | Cambridge, MA 02138 | Oil & Gas Operator | Nov 2005 |
| 30077 | Trap Rock Oil, LTD. | Houston, TX 77005 | Oil & Gas Operator | Dec 2025 |
| 30078 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 30079 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 30080 | Travco Well Servicing LLC | Okmulgee, OK 74447 | Oil Operator | Jul 2025 |
| 30081 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Dec 2025 |
| 30082 | Travell Energy, Inc | | Oil Operator | Dec 2023 |
| 30083 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 30084 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 30085 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 30086 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 30087 | Traverse Oil Co | | Oil & Gas Operator | Nov 1983 |
| 30088 | Traverse Oil Co And Federal Oil Co | | Oil & Gas Operator | Nov 1983 |
| 30089 | Travis | Houston, TX 77057 | Oil Operator | Dec 2025 |
| 30090 | Travis Coomer DRLG Co | | Oil Operator | Dec 2023 |
| 30091 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 30092 | Travis Oil Co | Los Angeles, CA 90024 | Oil Operator | Jan 1990 |
| 30093 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | Dec 2025 |
| 30094 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 30095 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 30096 | Traxler, Joyce | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 30097 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 30098 | TRC Cypress Group LLC | | Oil & Gas Operator | Oct 2025 |
| 30099 | TRC Operating Company Inc. | | Oil & Gas Operator | Nov 2025 |
| 30100 | Tre'J Exploration, Inc. | | Gas Operator | Dec 1991 |