| 30001 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 30002 | Transatlantic Petr (USA) Corp. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 30003 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 30004 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 30005 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 30006 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Mar 2025 |
| 30007 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 30008 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 30009 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 30010 | Transcontinental Oil & Gas Inc | Aurora, OH 44202 | Oil & Gas Operator | Dec 2024 |
| 30011 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 30012 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 30013 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 30014 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 30015 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 30016 | Transit Energy Inc | North Lawrence, OH 44666 | Oil & Gas Operator | Dec 2024 |
| 30017 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | May 2025 |
| 30018 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 30019 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 30020 | Transpacific Energy, LLC | Katy, TX 77450 | Oil & Gas Operator | May 2025 |
| 30021 | Transpetco I | Shreveport, LA 71101 | Oil & Gas Operator | May 2009 |
| 30022 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 30023 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 30024 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 30025 | Trap Rock Oil Company | Cambridge, MA 02138 | Oil & Gas Operator | Nov 2005 |
| 30026 | Trap Rock Oil, LTD. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 30027 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 30028 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 30029 | Travco Well Servicing LLC | Okmulgee, OK 74447 | Oil Operator | Feb 2025 |
| 30030 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | May 2025 |
| 30031 | Travell Energy, Inc | | Oil Operator | Dec 2023 |
| 30032 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 30033 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 30034 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 30035 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 30036 | Traverse Oil Co | | Oil & Gas Operator | Nov 1983 |
| 30037 | Traverse Oil Co And Federal Oil Co | | Oil & Gas Operator | Nov 1983 |
| 30038 | Travis | Houston, TX 77057 | Oil Operator | May 2025 |
| 30039 | Travis Coomer DRLG Co | | Oil Operator | Dec 2023 |
| 30040 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 30041 | Travis Oil Co | Los Angeles, CA 90024 | Oil Operator | Jan 1990 |
| 30042 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | May 2025 |
| 30043 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 30044 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 30045 | Traxler, Joyce | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 30046 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 30047 | TRC Cypress Group LLC | | Oil & Gas Operator | Feb 2025 |
| 30048 | TRC Operating Company Inc. | | Oil & Gas Operator | Mar 2025 |
| 30049 | Tre'J Exploration, Inc. | | Gas Operator | Dec 1991 |
| 30050 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | May 2025 |
| 30051 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 30052 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 30053 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 30054 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 30055 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 30056 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 30057 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 30058 | Trees Oil Compan | | Oil Operator | Jan 1995 |
| 30059 | Trejim Operators, LLC | Pampa, TX 79065 | Oil & Gas Operator | May 2025 |
| 30060 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 30061 | Trek Exploration, Inc. | Pampa, TX 79065 | Oil & Gas Operator | May 2025 |
| 30062 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 30063 | Trek Operating, LLC | Tulsa, OK 741520098 | Oil & Gas Operator | Mar 2021 |
| 30064 | Trek Petroleum Company, Inc. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 30065 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 30066 | Tremo Corporation | Toronto, KS 66777 | Oil Operator | May 1998 |
| 30067 | Tren Energy LLC | El Paso, TX 79912 | Oil & Gas Operator | May 2025 |
| 30068 | Trenchco Inc | Shawnee, OK 74802-3577 | Oil & Gas Operator | Apr 2015 |
| 30069 | Trend Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 30070 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 30071 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 30072 | Trend Oil Co | Petaluma, CA 94954 | Oil & Gas Operator | Feb 2017 |
| 30073 | Trend Properties | Olathe, KS 66061 | Gas Operator | Dec 1996 |
| 30074 | Trendsetter Production Co, Inc | | Oil & Gas Operator | Jul 2008 |
| 30075 | Trendwell Energy Corporation | | Oil & Gas Operator | Sep 2024 |
| 30076 | Trenmor Gas & Oil Co LLC | Frazeysburg, OH 43822 | Oil Operator | Dec 2022 |
| 30077 | Trenna Oil Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2013 |
| 30078 | Trenon Oil & Gas Inc | Oklahoma City, OK 73112-4279 | Oil & Gas Operator | Sep 1996 |
| 30079 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Mar 2025 |
| 30080 | Trepel Petroleum Exploration & | | Oil & Gas Operator | Apr 2014 |
| 30081 | Tres Azores Oil & Gas, Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 2003 |
| 30082 | Tres Operating Co., LLC | Katy, TX 77494 | Oil Operator | May 2025 |
| 30083 | Tres Piedras, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1999 |
| 30084 | Tres Roughneckas WTX LLC | MC Camey, TX 79752 | Oil Operator | May 2025 |
| 30085 | Tresami, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 30086 | Tresco Energy LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Jan 2025 |
| 30087 | Tresor Petroleum | | Oil & Gas Operator | Sep 1987 |
| 30088 | Tressler John R & IVa M | | Oil Operator | Apr 1989 |
| 30089 | Trestle Creek Properties, LLC | Manchaca, TX 78652 | Oil & Gas Operator | May 2025 |
| 30090 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 30091 | Trey Operating Company | MC Camey, TX 79752 | Oil Operator | Jan 2016 |
| 30092 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 30093 | Trey Services, Inc. | Midland, TX 79711 | Oil & Gas Operator | Dec 1996 |
| 30094 | Tri "M" Oil & Gas | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 30095 | Tri City Oil Co., LLC | Kountze, TX 77625 | Oil Operator | May 2025 |
| 30096 | Tri Energy Resources, Inc. | Norman, OK 73070 | Oil Operator | May 2025 |
| 30097 | Tri Family Oil Co | | Oil Operator | Dec 2024 |
| 30098 | Tri Investment Company | | Oil Operator | Mar 1980 |
| 30099 | Tri Production Inc | Healdton, OK 73438 | Oil & Gas Operator | Mar 2025 |
| 30100 | Tri Sportsmen Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | May 2025 |