| 101 | Adeco Energy Corporation | Norman, OK 73071 | Oil & Gas Operator | Apr 2014 |
| 102 | Adela Oil | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 103 | Adenryen, LTD. Co. | Richardson, TX 75082 | Oil Operator | Sep 2025 |
| 104 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 105 | Adgo Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2018 |
| 106 | Adkins, Michael H. | Austin, TX 78747 | Oil & Gas Operator | Sep 2025 |
| 107 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 108 | Admiral Permian Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 109 | Adobe Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2004 |
| 110 | Adobe Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 111 | Ads | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2010 |
| 112 | Ads Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Sep 2025 |
| 113 | Advance Exploration | Abilene, TX 79601 | Oil & Gas Operator | Sep 2025 |
| 114 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Sep 2025 |
| 115 | Advantagewon Oil, Us, Corp. | Batson, TX 77519 | Oil Operator | Dec 2019 |
| 116 | Adventure Expl Partners II, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2014 |
| 117 | Adventure Exploration PTRS, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 118 | Adventure Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Jan 2021 |
| 119 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 120 | Aec Operating Company | Roswell, NM 88202 | Oil & Gas Operator | Sep 2006 |
| 121 | Aeg Operating, LLC | Austin, TX 78746 | Oil Operator | Jun 2012 |
| 122 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 123 | Aegis Fluids Management, LLC | Plano, TX 75093 | Oil & Gas Operator | Sep 2025 |
| 124 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | Sep 2025 |
| 125 | Aerie Energy | Cedar Creek, TX 78612 | Oil Operator | Sep 2025 |
| 126 | Aeternum Energy, LLC | Nederland, TX 77627 | Oil & Gas Operator | Sep 2025 |
| 127 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 128 | Aethon I LP | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 129 | Af Operating, LLC | Tuscaloosa, AL 35404 | Oil Operator | Sep 2012 |
| 130 | Afe Oil & Gas Consultants | Addison, TX 75001 | Gas Operator | Jan 2003 |
| 131 | Afoc, LLC | Fort Worth, TX 76147 | Oil Operator | Sep 2025 |
| 132 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Sep 2025 |
| 133 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 134 | Agave Operating Company, Inc. | Holliday, TX 76366 | Oil Operator | Sep 2025 |
| 135 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2025 |
| 136 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 137 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Sep 2025 |
| 138 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 139 | Agroil, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Sep 2025 |
| 140 | Ah Operating, LLC | Midland, TX 79710 | Gas Operator | Sep 2025 |
| 141 | Ahabb Oil | Luling, TX 78648 | Oil & Gas Operator | Dec 1998 |
| 142 | Aikman Brothers, LLC | Amarillo, TX 79109 | Oil & Gas Operator | May 2025 |
| 143 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Sep 2025 |
| 144 | Aim Consultants Inc. | Rockville, MD 20852 | Oil & Gas Operator | Mar 2008 |
| 145 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Sep 2025 |
| 146 | Ajax Resources, LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2025 |
| 147 | Ak Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 148 | Ak Pearson Family Trust | Amarillo, TX 79114 | Oil Operator | Sep 2025 |
| 149 | Akea, Inc. | Holliday, TX 76366 | Oil Operator | Sep 2025 |
| 150 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 151 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 152 | Akers, Bill | Hebbronville, TX 78361 | Oil & Gas Operator | Aug 2003 |
| 153 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | Sep 2025 |
| 154 | Akins Oil Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Sep 2025 |
| 155 | Akma, Inc. | Ore City, TX 75683 | Oil & Gas Operator | Apr 1999 |
| 156 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Sep 2025 |
| 157 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 158 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2021 |
| 159 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 160 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 161 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2025 |
| 162 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Sep 2025 |
| 163 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 164 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 165 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 166 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 167 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Sep 2025 |
| 168 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Sep 2025 |
| 169 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2025 |
| 170 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Sep 2025 |
| 171 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Sep 2025 |
| 172 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | Sep 2025 |
| 173 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 174 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | Sep 2025 |
| 175 | Alda Oil & Gas Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 176 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Sep 2025 |
| 177 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 178 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2025 |
| 179 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 180 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 181 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 2025 |
| 182 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | Sep 2025 |
| 183 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 184 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Sep 2025 |
| 185 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 186 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 187 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | Sep 2025 |
| 188 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | Sep 2025 |
| 189 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 190 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 191 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 192 | All In Energy Production Corp. | Red Rock, TX 78662 | Oil Operator | Sep 2025 |
| 193 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 194 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 195 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 196 | Allegiance Operating Inc. | Wichita Falls, TX 76307 | Oil Operator | Sep 2025 |
| 197 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Sep 2025 |
| 198 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 199 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 200 | Allen & Grace Oil Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jul 1997 |