| 30101 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | Dec 2025 |
| 30102 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 30103 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 30104 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 30105 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 30106 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 30107 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 30108 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 30109 | Trees Oil Compan | | Oil Operator | Jan 1995 |
| 30110 | Trejim Operators, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 30111 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 30112 | Trek Exploration, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 30113 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 30114 | Trek Operating, LLC | Tulsa, OK 741520098 | Oil & Gas Operator | Mar 2021 |
| 30115 | Trek Petroleum Company, Inc. | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 30116 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2025 |
| 30117 | Tremo Corporation | Toronto, KS 66777 | Oil Operator | May 1998 |
| 30118 | Tren Energy LLC | El Paso, TX 79912 | Oil & Gas Operator | Dec 2025 |
| 30119 | Trenchco Inc | Shawnee, OK 74802-3577 | Oil & Gas Operator | Apr 2015 |
| 30120 | Trend Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 30121 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 30122 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 30123 | Trend Oil Co | Petaluma, CA 94954 | Oil & Gas Operator | Feb 2017 |
| 30124 | Trend Properties | Olathe, KS 66061 | Gas Operator | Dec 1996 |
| 30125 | Trendsetter Production Co, Inc | | Oil & Gas Operator | Jul 2008 |
| 30126 | Trendwell Energy Corporation | | Oil & Gas Operator | Oct 2025 |
| 30127 | Trenmor Gas & Oil Co LLC | Frazeysburg, OH 43822 | Oil Operator | Dec 2023 |
| 30128 | Trenna Oil Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2013 |
| 30129 | Trenon Oil & Gas Inc | Oklahoma City, OK 73112-4279 | Oil & Gas Operator | Sep 1996 |
| 30130 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Oct 2025 |
| 30131 | Trepel Petroleum Exploration & | | Oil & Gas Operator | Apr 2014 |
| 30132 | Tres Azores Oil & Gas, Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 2003 |
| 30133 | Tres Operating Co., LLC | Katy, TX 77494 | Oil Operator | Dec 2025 |
| 30134 | Tres Piedras, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1999 |
| 30135 | Tres Roughneckas WTX LLC | MC Camey, TX 79752 | Oil Operator | Dec 2025 |
| 30136 | Tresami, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 30137 | Tresco Energy LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Oct 2025 |
| 30138 | Tresor Petroleum | | Oil & Gas Operator | Sep 1987 |
| 30139 | Tressler John R & IVa M | | Oil Operator | Apr 1989 |
| 30140 | Trestle Creek Properties, LLC | Manchaca, TX 78652 | Oil & Gas Operator | Dec 2025 |
| 30141 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 30142 | Trey Operating Company | MC Camey, TX 79752 | Oil Operator | Jan 2016 |
| 30143 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 30144 | Trey Services, Inc. | Midland, TX 79711 | Oil & Gas Operator | Dec 1996 |
| 30145 | Tri "M" Oil & Gas | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 30146 | Tri City Oil Co., LLC | Kountze, TX 77625 | Oil Operator | Dec 2025 |
| 30147 | Tri Energy Resources, Inc. | Norman, OK 73070 | Oil Operator | Dec 2025 |
| 30148 | Tri Family Oil Co | | Oil Operator | Dec 2024 |
| 30149 | Tri Investment Company | | Oil Operator | Mar 1980 |
| 30150 | Tri Production Inc | Healdton, OK 73438 | Oil & Gas Operator | Oct 2025 |
| 30151 | Tri Sportsmen Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 30152 | Tri Star Operating, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Jan 2002 |
| 30153 | Tri United, Inc | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 30154 | Tri-Am Operating Company | Frankston, TX 75763 | Oil & Gas Operator | Dec 2025 |
| 30155 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 30156 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 30157 | Tri-City Drilling Joint Venture | Belpre, OH 45714 | Oil & Gas Operator | Dec 2024 |
| 30158 | Tri-City Energy Inc | Wilson, OK 73463-0196 | Oil Operator | Mar 2014 |
| 30159 | Tri-County Oil & Gas, Inc. | Fairmont, WV 26555-0000 | Oil & Gas Operator | Dec 2019 |
| 30160 | Tri-Dyne Resources, Inc. | Southern Pine, NC 28387 | Oil & Gas Operator | Feb 2000 |
| 30161 | Tri-Ex Corporation | | Oil & Gas Operator | Jan 1985 |
| 30162 | Tri-Ex Petroleum, L.P. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2013 |
| 30163 | Tri-Force Operating, L.L.C. | Royse City, TX 75189 | Oil & Gas Operator | Dec 2025 |
| 30164 | Tri-J Tubulars, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1996 |
| 30165 | Tri-K Production Company, Inc. | Olney, TX 76374 | Oil & Gas Operator | Apr 1996 |
| 30166 | Tri-L Oil Co. | | Oil Operator | Sep 2015 |
| 30167 | Tri-Par Exploration, Inc. | | Oil Operator | Oct 2001 |
| 30168 | Tri-Production Company | | Oil Operator | Apr 1994 |
| 30169 | Tri-Quest Resources | | Oil & Gas Operator | Feb 1995 |
| 30170 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 30171 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 30172 | Tri-State Resources, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2012 |
| 30173 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 30174 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 30175 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 30176 | Tri-Unity Inc | Sand Springs, OK 74063-4401 | Oil & Gas Operator | Jun 2009 |
| 30177 | Tri-Valley Oil & Gas Co. | | Oil & Gas Operator | Oct 2025 |
| 30178 | Tri-W Oil | Luling, TX 78648 | Oil Operator | Dec 2025 |
| 30179 | Tri-W Oil, Inc. | Luling, TX 78648 | Oil Operator | Apr 2007 |
| 30180 | Triad Energy Corp Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 30181 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 30182 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Oct 2025 |
| 30183 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 30184 | Triad O&G, LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 30185 | Triad Oil & Gas Co Inc | | Oil & Gas Operator | Jun 1994 |
| 30186 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 30187 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 30188 | Triana Energy LLC | Charleston, WV 25301-2815 | Gas Operator | Nov 2018 |
| 30189 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 30190 | Triangle Energy Co. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 30191 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 30192 | Triangle J Oil Company | | Oil & Gas Operator | Mar 2007 |
| 30193 | Triangle Oil & G G Cornwell | | Oil & Gas Operator | Nov 1981 |
| 30194 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 30195 | Triangle Oil Producers Inc | | Oil & Gas Operator | Jun 1998 |
| 30196 | Triangle Operating Co., Inc. | | Gas Operator | Jan 2000 |
| 30197 | Triangle P Development Corp. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2025 |
| 30198 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2024 |
| 30199 | Triangle USA Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2021 |
| 30200 | Triax Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2018 |