| 101 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 102 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 103 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 104 | Erin Oil Co. | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 105 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Mar 2025 |
| 106 | Esco Oil Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 107 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 108 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Mar 2025 |
| 109 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 110 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 111 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 112 | Fieldwood Onshore LLC | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 113 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 114 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 115 | Forney & McCombs | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 116 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Mar 2025 |
| 117 | Fourth Floor Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 118 | Freeman Expl. & Prod. Co., Inc. | Houston, TX 77279 | Oil & Gas Operator | Aug 2020 |
| 119 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 120 | Frio Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 121 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 122 | Galveston Bay Energy, LLC | Spring, TX 77386 | Oil & Gas Operator | Jul 2017 |
| 123 | Galveston Bay Operating Co LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 124 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Mar 2025 |
| 125 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Mar 2025 |
| 126 | Gcows Operating LLC | Montgomery, TX 77356 | Oil Operator | Mar 2025 |
| 127 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 128 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 129 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Mar 2025 |
| 130 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 131 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | Mar 2025 |
| 132 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 133 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 134 | Guidry, J.R. | High Island, TX 77623 | Oil Operator | Mar 2025 |
| 135 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 136 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 137 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Mar 2025 |
| 138 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2024 |
| 139 | Henderson, Peter Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2020 |
| 140 | Heritage Operating Co., Inc. The | Stafford, TX 77497 | Oil & Gas Operator | May 1997 |
| 141 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 142 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 143 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 144 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 145 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 146 | Houston Oil Prod Enterprises,Inc | Houston, TX 77006 | Oil & Gas Operator | Mar 2025 |
| 147 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 148 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Mar 2025 |
| 149 | Howard, Douglas J. | Houston, TX 77070 | Oil & Gas Operator | Mar 2008 |
| 150 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 151 | HRB Oil | Houston, TX 77042 | Oil & Gas Operator | Oct 1998 |
| 152 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Mar 2025 |
| 153 | Hunt, Hassie Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 154 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Mar 2025 |
| 155 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 156 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 157 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2025 |
| 158 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 159 | Irish Oil & Gas Co. | Houston, TX 77242 | Oil & Gas Operator | Aug 2003 |
| 160 | J K Exploration & Production Inc | Fullerton, CA 92832 | Oil & Gas Operator | Mar 2025 |
| 161 | J.R. Oil And Gas Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2025 |
| 162 | JMC Resources Corp. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 163 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 164 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 165 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 166 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 167 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 168 | Kelly Resources, LTD. | Frisco, TX 75034 | Oil & Gas Operator | Aug 2004 |
| 169 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 170 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 171 | Kga Oil Company, Inc. | High Island, TX 77623 | Oil & Gas Operator | Aug 2004 |
| 172 | Kiawah Resources, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2017 |
| 173 | Legend Natural Gas II, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 174 | Libom Oil Company | Elmsford, NY 10523 | Oil & Gas Operator | Aug 2003 |
| 175 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Mar 2025 |
| 176 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 177 | Live Oak Op & Production, L.L.C. | Austin, TX 78759 | Oil & Gas Operator | Nov 2011 |
| 178 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 179 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Mar 2025 |
| 180 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 181 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 182 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 183 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2025 |
| 184 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Mar 2025 |
| 185 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 186 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2025 |
| 187 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 188 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 189 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 190 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 191 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Mar 2025 |
| 192 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 193 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 194 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 195 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 196 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 197 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Mar 2025 |
| 198 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 199 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 200 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |