| 101 | A & E Minerals, LLC | Shreveport, LA 71104 | Oil & Gas Operator | Sep 2025 |
| 102 | A & G Oil Company, LLC | Barstow, TX 79719 | Oil & Gas Operator | Feb 2012 |
| 103 | A & G Producers, Inc. | Barstow, TX 79719 | Oil & Gas Operator | Sep 2025 |
| 104 | A & P Oil & Gas | Leona, TX 75850 | Oil Operator | Sep 2025 |
| 105 | A & T Oil Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2008 |
| 106 | A - Z Operating LLC | Winters, TX 79567 | Oil Operator | Sep 2025 |
| 107 | A A Production Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 108 | A C Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Mar 2008 |
| 109 | A D D Productions | Sweetwater, TX 79556 | Oil & Gas Operator | Jul 2019 |
| 110 | A E G Oil, Inc. | Hale Center, TX 79041 | Oil & Gas Operator | Sep 2025 |
| 111 | A J A Companies | Tyler, TX 75703 | Oil Operator | Sep 2025 |
| 112 | A T M Corporation | Mathis, TX 78368 | Oil & Gas Operator | Oct 2002 |
| 113 | A&M Oil & Gas LLC | Kermit, TX 79745 | Oil & Gas Operator | Sep 2025 |
| 114 | A-E Operating Committee | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1996 |
| 115 | A-G-B, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 116 | A. Bauer, LLC | Red Rock, TX 78662 | Oil Operator | Sep 2025 |
| 117 | A. P. B. Petro | Winters, TX 79567 | Oil & Gas Operator | Oct 2005 |
| 118 | A.A.F. Production Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Dec 1997 |
| 119 | A.C.T. Operating Company | Lubbock, TX 79401 | Oil & Gas Operator | Sep 2025 |
| 120 | A.D. Operating | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 121 | A.D.A. Oil Co | Iowa Park, TX 76367 | Oil Operator | Aug 2003 |
| 122 | A.D.S. Resources, Inc. | Lubbock, TX 79413 | Oil & Gas Operator | Jul 2008 |
| 123 | A.E.N. Energy | Abilene, TX 79608 | Oil & Gas Operator | Feb 2005 |
| 124 | A.E.N. Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jan 1996 |
| 125 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Sep 2025 |
| 126 | A2c Energy LLC | Houston, TX 77074 | Oil Operator | Sep 2025 |
| 127 | Aaa Oil Company | Castroville, TX 78009 | Oil & Gas Operator | Sep 2025 |
| 128 | Aardolie Oil Company | Dallas, TX 75370 | Oil & Gas Operator | Jul 2003 |
| 129 | Aaron & Jeter | Seminole, TX 79360 | Oil & Gas Operator | Jan 2003 |
| 130 | Aaronmark Services, LLC | New Braunfels, TX 78130 | Oil Operator | Sep 2025 |
| 131 | Ab Reserve, LLC | Rockdale, TX 76567 | Oil Operator | Sep 2025 |
| 132 | Aba Oil LLC | Burkburnett, TX 76354 | Oil Operator | Sep 2025 |
| 133 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2025 |
| 134 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2020 |
| 135 | Abb Oil Co., Inc. | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 2025 |
| 136 | Abbott, John Operating | Abilene, TX 79605 | Oil & Gas Operator | Sep 2025 |
| 137 | ABC NRG | Vernon, TX 76384 | Oil Operator | Sep 2025 |
| 138 | Abel Production Company | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2000 |
| 139 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 140 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 141 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 142 | Aberlour Operating Inc. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 143 | Abernathy Auto, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 144 | Abernathy Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2002 |
| 145 | Abilene American Energy, LLC | Abilene, TX 79602 | Oil Operator | Sep 2025 |
| 146 | Ableready, Inc. | Houston, TX 77269 | Oil & Gas Operator | Sep 2025 |
| 147 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Sep 2025 |
| 148 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 149 | Abtex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2006 |
| 150 | Abx Oil & Gas, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2025 |
| 151 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 152 | Acadia Oil Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2007 |
| 153 | Acadia Oil, LLC | Wichita Falls, TX 76310 | Oil Operator | Sep 2025 |
| 154 | Accell Natural Gas Company | Houston, TX 77042 | Oil & Gas Operator | Sep 1998 |
| 155 | Access Resources Inc. | Healdton, OK 73438 | Oil & Gas Operator | Sep 2005 |
| 156 | Accidie Exploration And Dev.,Inc | Plano, TX 75023 | Oil & Gas Operator | Sep 2025 |
| 157 | Acco Oil & Gas Company | Houston, TX 77056 | Oil & Gas Operator | Sep 2001 |
| 158 | Ace Energy LLC | Leawood, KS 66211 | Oil & Gas Operator | Jun 2025 |
| 159 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | Sep 2025 |
| 160 | Acierto Resources Company, LLC | Houston, TX 77070 | Oil & Gas Operator | Sep 2025 |
| 161 | Acirema Corporation | Longview, TX 75608 | Oil & Gas Operator | Sep 2025 |
| 162 | Ackerly Service Company, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Nov 1997 |
| 163 | Ackerman, Albert C. | Boerne, TX 78006 | Oil & Gas Operator | Oct 1995 |
| 164 | Acme Petroleum Co. | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2008 |
| 165 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 166 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Sep 2025 |
| 167 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 168 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2025 |
| 169 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | Sep 2025 |
| 170 | Acoma Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Sep 2025 |
| 171 | Acorn Oil & Gas, Inc. | Orchard, TX 77464 | Oil Operator | Sep 2017 |
| 172 | Acorn Oil & Gas, LLC | Iraan, TX 79744 | Oil & Gas Operator | Sep 2025 |
| 173 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Sep 2025 |
| 174 | Activa Resources, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2008 |
| 175 | Ada Belle Oil & Gas Company | Sourlake, TX 77659 | Oil Operator | Dec 2023 |
| 176 | Ada Exploration | Olney, TX 76374 | Oil & Gas Operator | Sep 2025 |
| 177 | Adair Resources Inc. | Ennis, TX 75120 | Oil & Gas Operator | Apr 2018 |
| 178 | Adami Compressor Service | Weatherford, TX 76086 | Gas Operator | Sep 2025 |
| 179 | Adams & McGahey | Amarillo, TX 79114 | Oil & Gas Operator | Nov 1998 |
| 180 | Adams Affiliates, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Sep 2025 |
| 181 | Adams Branch Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2002 |
| 182 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 183 | Adams, K. S. Jr. | Houston, TX 77001 | Gas Operator | Sep 2013 |
| 184 | Adams, Lynn V. | Nocona, TX 76255 | Oil & Gas Operator | Sep 2025 |
| 185 | Adams, R. W. & Son | Amarillo, TX 79109 | Oil & Gas Operator | Oct 1996 |
| 186 | Adamson Exploration Co. | Kilgore, TX 75662 | Oil Operator | Sep 2025 |
| 187 | Adamson Exploration Corporation | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2008 |
| 188 | Adcock, Carol | Ozona, TX 76943 | Oil & Gas Operator | Sep 2025 |
| 189 | Adcock, Leroy | Ozona, TX 76943 | Oil & Gas Operator | Jun 2009 |
| 190 | Addax Operating, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 191 | Addison - Graves, L.L.C. | Archer City, TX 76351 | Oil Operator | Sep 2025 |
| 192 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 193 | Addison, Kenneth | Archer City, TX 76351 | Oil & Gas Operator | Dec 2017 |
| 194 | Adeco Energy Corporation | Norman, OK 73071 | Oil & Gas Operator | Apr 2014 |
| 195 | Adela Oil | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 196 | Adenryen, LTD. Co. | Richardson, TX 75082 | Oil Operator | Sep 2025 |
| 197 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 198 | Adgo Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2018 |
| 199 | Adkins, Michael H. | Austin, TX 78747 | Oil & Gas Operator | Sep 2025 |
| 200 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |