| 201 | Adela Oil | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 202 | Adenryen, LTD. Co. | Richardson, TX 75082 | Oil Operator | Dec 2025 |
| 203 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 204 | Adgo Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2018 |
| 205 | Adkins, Michael H. | Austin, TX 78747 | Oil & Gas Operator | Dec 2025 |
| 206 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 207 | Admiral Permian Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 208 | Adobe Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2004 |
| 209 | Adobe Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 210 | Ads | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2010 |
| 211 | Ads Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2025 |
| 212 | Advance Exploration | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 213 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Dec 2025 |
| 214 | Advantagewon Oil, Us, Corp. | Batson, TX 77519 | Oil Operator | Dec 2019 |
| 215 | Adventure Expl Partners II, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2014 |
| 216 | Adventure Exploration PTRS, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 217 | Adventure Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Jan 2021 |
| 218 | Aec Operating Company | Roswell, NM 88202 | Oil & Gas Operator | Sep 2006 |
| 219 | Aeg Operating, LLC | Austin, TX 78746 | Oil Operator | Jun 2012 |
| 220 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 221 | Aegis Fluids Management, LLC | Plano, TX 75093 | Oil & Gas Operator | Dec 2025 |
| 222 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 2025 |
| 223 | Aerie Energy | Cedar Creek, TX 78612 | Oil Operator | Dec 2025 |
| 224 | Aeternum Energy, LLC | Nederland, TX 77627 | Oil & Gas Operator | Dec 2025 |
| 225 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 226 | Aethon I LP | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 227 | Af Operating, LLC | Tuscaloosa, AL 35404 | Oil Operator | Sep 2012 |
| 228 | Afe Oil & Gas Consultants | Addison, TX 75001 | Gas Operator | Jan 2003 |
| 229 | Afoc, LLC | Fort Worth, TX 76147 | Oil Operator | Dec 2025 |
| 230 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Dec 2025 |
| 231 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 232 | Agave Operating Company, Inc. | Holliday, TX 76366 | Oil Operator | Dec 2025 |
| 233 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 234 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 235 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Dec 2025 |
| 236 | Agis Energy Inc. | Lafayette, LA 70508 | Oil & Gas Operator | Dec 2025 |
| 237 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 238 | Agroil, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2025 |
| 239 | Ah Operating, LLC | Midland, TX 79710 | Gas Operator | Dec 2025 |
| 240 | Ahabb Oil | Luling, TX 78648 | Oil & Gas Operator | Dec 1998 |
| 241 | Aicr LLC | Odessa, TX 79768 | Oil Operator | Dec 2025 |
| 242 | Aikman Brothers, LLC | Amarillo, TX 79109 | Oil & Gas Operator | Aug 2025 |
| 243 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Dec 2025 |
| 244 | Aim Consultants Inc. | Rockville, MD 20852 | Oil & Gas Operator | Mar 2008 |
| 245 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 246 | Ajax Resources, LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 247 | Ak Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 248 | Ak Pearson Family Trust | Amarillo, TX 79114 | Oil Operator | Dec 2025 |
| 249 | Akea, Inc. | Holliday, TX 76366 | Oil Operator | Dec 2025 |
| 250 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 251 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 252 | Akers, Bill | Hebbronville, TX 78361 | Oil & Gas Operator | Aug 2003 |
| 253 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 254 | Akins Oil Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2025 |
| 255 | Akma, Inc. | Ore City, TX 75683 | Oil & Gas Operator | Apr 1999 |
| 256 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Dec 2025 |
| 257 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 258 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2021 |
| 259 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 260 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 261 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Dec 2025 |
| 262 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 263 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 264 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 265 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 266 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 267 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Dec 2025 |
| 268 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Dec 2025 |
| 269 | Alco Oil & Gas Co. LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 270 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Dec 2025 |
| 271 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Dec 2025 |
| 272 | Alcorn Energy, L.L.C. | Woodway, TX 76712 | Oil Operator | Dec 2025 |
| 273 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 274 | Alcorn, Jerry D. | Grand Prairie, TX 75050 | Oil & Gas Operator | Dec 2025 |
| 275 | Alda Oil & Gas Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 276 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | Dec 2025 |
| 277 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 278 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 279 | Alegre Operating, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2025 |
| 280 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 281 | Alexander Production Company | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2021 |
| 282 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 283 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | Dec 2025 |
| 284 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 285 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Dec 2025 |
| 286 | Alexander, Stanley | Electra, TX 76360 | Oil & Gas Operator | May 2016 |
| 287 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 288 | Alfaro Oil & Gas | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2025 |
| 289 | Alfaro Production LLC | Burkburnett, TX 76354 | Oil Operator | Dec 2025 |
| 290 | Algoa Operating Company, LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2002 |
| 291 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 292 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 293 | All In Energy Production Corp. | Red Rock, TX 78662 | Oil Operator | Dec 2025 |
| 294 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 295 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 296 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 297 | Allegiance Operating Inc. | Wichita Falls, TX 76307 | Oil Operator | Dec 2025 |
| 298 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Dec 2025 |
| 299 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 300 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |