| 101 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 102 | Glenco Oil & Gas Company | Seguin, TX 78155 | Oil & Gas Operator | Dec 1994 |
| 103 | Great Plains Resources, Inc. | Nixon, TX 78140 | Oil & Gas Operator | May 2025 |
| 104 | H & K Oil Company (A) | Luling, TX 78648 | Oil Operator | May 2025 |
| 105 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 106 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | May 2025 |
| 107 | Herms, Walter | Luling, TX 78648 | Oil & Gas Operator | Sep 2002 |
| 108 | Hoermann, S. E. | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 109 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 110 | Horizon Ridge Oil Company | Austin, TX 78738 | Oil Operator | May 2025 |
| 111 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 112 | Howell Crane & Rigging, Inc. | San Antonio, TX 78220 | Oil Operator | May 2025 |
| 113 | Hrbacek Oil Corp. | La Grange, TX 78945 | Oil & Gas Operator | Feb 2004 |
| 114 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 115 | Integrated Operating Corporation | Dallas, TX 75243 | Oil & Gas Operator | May 2025 |
| 116 | Iron Orchard Operating LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 117 | J & M Production | Luling, TX 78648 | Oil & Gas Operator | Nov 2019 |
| 118 | J&J Oil | La Vernia, TX 78121 | Oil & Gas Operator | May 2025 |
| 119 | J-Energy | La Vernia, TX 78121 | Oil & Gas Operator | May 2017 |
| 120 | J.A.G. Oil & Gas | La Vernia, TX 78121 | Oil & Gas Operator | May 2025 |
| 121 | Jaybird Resources, LLC | Cuero, TX 77954 | Oil Operator | May 2025 |
| 122 | Johanson Oil | La Vernia, TX 78121 | Oil Operator | Dec 2023 |
| 123 | JSD Oil, LTD. | Seguin, TX 78155 | Oil Operator | Nov 2013 |
| 124 | JWC Oil Operator, LLC | MC Queeney, TX 78123 | Oil Operator | May 2018 |
| 125 | K And R Operating | Kingsbury, TX 78638 | Oil & Gas Operator | May 2025 |
| 126 | Karenco Energy, Incorporated | Seguin, TX 78155 | Oil & Gas Operator | Oct 1997 |
| 127 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 128 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 129 | Kemco Oil | Alice, TX 78332 | Oil & Gas Operator | Aug 2009 |
| 130 | Kidd Production Co. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 131 | Kingwood Oil Co; Inc | Luling, TX 78648 | Oil & Gas Operator | Nov 2015 |
| 132 | Koch, P. S. | Seguin, TX 78155 | Oil & Gas Operator | May 2018 |
| 133 | La Vernia Oil | La Vernia, TX 78121 | Oil Operator | May 2025 |
| 134 | Lambeck Petroleum, LLC | Stockdale, TX 78160 | Oil Operator | May 2025 |
| 135 | Land, Cleatus H. Estate | Seguin, TX 78155 | Oil & Gas Operator | Mar 2001 |
| 136 | Landmen Of Texas, Inc. | Hondo, TX 78861 | Oil Operator | Dec 2016 |
| 137 | Larison Oil Company | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 138 | Levant Energy LLC | Milton, MA 02186 | Oil Operator | May 2025 |
| 139 | Lif-Tex Oil Recovery, Inc. | Luling, TX 78648 | Oil Operator | May 2025 |
| 140 | Lively Exploration Company | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 141 | LMN Oil And Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2008 |
| 142 | Longshot Energy LLC | League City, TX 77573 | Oil Operator | May 2025 |
| 143 | Lott Production Company | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 144 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 145 | LT Oil LLC | San Marcos, TX 78666 | Oil Operator | May 2025 |
| 146 | Luling O&G LLC | Cibolo, TX 78108 | Oil & Gas Operator | May 2025 |
| 147 | Luling Well Service | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 148 | Lynch, W. Waldo | Uvalde, TX 78801 | Oil & Gas Operator | Jan 1996 |
| 149 | M-Five Oil Company | Seguin, TX 78155 | Oil & Gas Operator | Apr 2002 |
| 150 | Main Street Royalty, Inc. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 1999 |
| 151 | Malone Oil Production | La Vernia, TX 78121 | Oil & Gas Operator | May 2025 |
| 152 | Marymac Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2001 |
| 153 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 154 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 155 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 156 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 157 | McMullan Oil Company | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2023 |
| 158 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 159 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 160 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 161 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 162 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 163 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 164 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 165 | Mockingbird Oil, Inc. (I) | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 166 | Mortimer Production Company | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 167 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | May 2025 |
| 168 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 169 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | May 2025 |
| 170 | Nelms Bros. Oil Properties Inc. | Austin, TX 78711 | Oil & Gas Operator | Jun 1996 |
| 171 | New Beginning | Seguin, TX 78156 | Oil Operator | Jun 2016 |
| 172 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 173 | Origin Prod Co Gonzales Prop LLC | New Braunfels, TX 78132 | Oil & Gas Operator | May 2025 |
| 174 | Origin Production Company, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | May 2025 |
| 175 | Orr Production Company | Austin, TX 78746 | Oil & Gas Operator | Dec 2000 |
| 176 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 177 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 178 | P.S.N. Petroleum, Inc. | San Antonio, TX 78233 | Oil & Gas Operator | May 2025 |
| 179 | Pace Oil And Gas Company | Austin, TX 78715 | Oil & Gas Operator | May 2025 |
| 180 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 181 | Penrod Oil Company Of Texas, Inc | Milano, TX 76556 | Oil & Gas Operator | May 2025 |
| 182 | Perkins, Eugene O. | Boerne, TX 78015 | Oil & Gas Operator | May 2025 |
| 183 | Petrosaurus, Inc. | Somerset, TX 78069 | Oil Operator | May 2025 |
| 184 | Pitchfork Oil & Gas, Inc. | Orchard, TX 77464 | Oil & Gas Operator | May 2025 |
| 185 | Powell, A. D., Oil Corp. | Luling, TX 78648 | Oil & Gas Operator | Aug 1996 |
| 186 | Pratt, Griffith, Teten | Austin, TX 78701 | Oil & Gas Operator | Dec 1995 |
| 187 | Pre Oil Company | Seguin, TX 78155 | Oil & Gas Operator | Aug 1993 |
| 188 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | May 2025 |
| 189 | Production Resources, Inc. | Castroville, TX 78009 | Oil & Gas Operator | May 2025 |
| 190 | Pronto Services | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 191 | Quest Emg, Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 192 | Quest Research & Dev. Corp. | Weatherford, TX 76086 | Oil & Gas Operator | May 2025 |
| 193 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 194 | Rainer Energy, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | May 2025 |
| 195 | Rampage Exploration, Inc. | Austin, TX 78737 | Oil & Gas Operator | May 2025 |
| 196 | Rayalto Oil & Gas, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2004 |
| 197 | RBR Operating, Inc. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 198 | Rec Well Service, Inc. | Pleasanton, TX 78064 | Oil & Gas Operator | Jul 2008 |
| 199 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 200 | Reliance Oil And Gas, Inc. | Austin, TX 78748 | Oil Operator | Jun 2012 |