| 201 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 202 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 203 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 204 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 205 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 206 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Dec 2025 |
| 207 | Newfield Expl. Mid-Con. Inc | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2015 |
| 208 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 209 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 210 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 211 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 212 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 213 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 214 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 215 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 216 | Ojai Oil Company | Camarillo, CA 93012 | Oil & Gas Operator | Sep 2025 |
| 217 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 218 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 219 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 220 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 221 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 222 | Page Energy | Eldorado, TX 76936 | Oil & Gas Operator | Mar 1997 |
| 223 | Paladin Exploration Co., Inc. | Plano, TX 75093 | Oil & Gas Operator | Feb 1995 |
| 224 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 225 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 226 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 227 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 228 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 229 | Patrick Exploration Company | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 230 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 231 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 232 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 233 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 234 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 235 | Perdure Petroleum LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2021 |
| 236 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 237 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 238 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 239 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 240 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 241 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 242 | Petrosource Production Co. L.P. | Midland, TX 79701 | Oil & Gas Operator | Nov 2007 |
| 243 | Petrosource Production Co., LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 244 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 245 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 246 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 247 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 248 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 249 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 250 | Pony Express Corporate Trust | Aledo, TX 76008 | Oil & Gas Operator | Dec 2025 |
| 251 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 252 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2025 |
| 253 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2025 |
| 254 | Quintana Pet. Corp. | Refugio, TX 78377 | Oil & Gas Operator | Dec 2000 |
| 255 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 256 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 257 | Rand Oil & Gas Corp. | Houston, TX 77040 | Oil & Gas Operator | Dec 2025 |
| 258 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 259 | Red Tail Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 260 | Red Willow Production, LLC | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2015 |
| 261 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 262 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 263 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 264 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Dec 2025 |
| 265 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 266 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 267 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Dec 2025 |
| 268 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 269 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Dec 2025 |
| 270 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Dec 2025 |
| 271 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 272 | Rogers, S. K. Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Dec 2025 |
| 273 | Sabinal Energy Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2025 |
| 274 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Dec 2025 |
| 275 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 276 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 277 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 278 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 279 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 280 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 281 | Sandridge Tertiary, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2012 |
| 282 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 283 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 284 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 285 | Sayers Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2005 |
| 286 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 287 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 288 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 289 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 290 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Dec 2025 |
| 291 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 292 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Dec 2025 |
| 293 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Dec 2025 |
| 294 | Shinnery Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 295 | Sierra Lima Oil & Gas, LLC | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 296 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 297 | Smith Energy Operating Company | Lubbock, TX 79423 | Oil & Gas Operator | Dec 2025 |
| 298 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 299 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 300 | Socorro Exploration, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Dec 2025 |