| 201 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 202 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 203 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 204 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 205 | Mokan Capital, LLC | Spicewood, TX 78669 | Oil Operator | Jul 2025 |
| 206 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 207 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 208 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 209 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Mar 2024 |
| 210 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Jul 2025 |
| 211 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 212 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 213 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 214 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 215 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 216 | Nosivad Oil, Inc. | Clyde, TX 79510 | Oil & Gas Operator | Jul 2025 |
| 217 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Jul 2025 |
| 218 | Oasis Operating, Inc. | Lubbock, TX 79404 | Oil & Gas Operator | Nov 2020 |
| 219 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 220 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 221 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 222 | Ormand, Don R. | Midland, TX 79705 | Oil & Gas Operator | Jan 2016 |
| 223 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 224 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 225 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 226 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 227 | P & R Oil Company | Post, TX 79356 | Oil & Gas Operator | Jul 2025 |
| 228 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2025 |
| 229 | Par Producing Company | Snyder, TX 79550 | Oil & Gas Operator | Jun 2017 |
| 230 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 231 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 232 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 233 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 234 | Patton, E. N. Oil Company, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 235 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 236 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 237 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 238 | Petroleum Property MGMT, Inc (A) | Fort Worth, TX 76101 | Oil & Gas Operator | May 1994 |
| 239 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 240 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 241 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 242 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 243 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 244 | Polaris Production Corp. | Midland, TX 79702 | Oil & Gas Operator | Jan 2024 |
| 245 | Polk Petroleum, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 246 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2025 |
| 247 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 248 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 249 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Jul 2025 |
| 250 | Psi Production, Inc. | Tyler, TX 75702 | Gas Operator | Jan 1994 |
| 251 | Pyramid Gas Co | Midland, TX 79701 | Oil Operator | Jul 2025 |
| 252 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 253 | Quatro Oil And Gas, Inc. | Joshua, TX 76058 | Oil & Gas Operator | Jul 2025 |
| 254 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 2025 |
| 255 | Rand - Paulson Oil Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Feb 1999 |
| 256 | Rand Energy Company | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 257 | Raptor Petroleum II, LLC | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 258 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 259 | Remo, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2003 |
| 260 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Jul 2025 |
| 261 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 262 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Jul 2025 |
| 263 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 264 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2025 |
| 265 | Robertson-Bryce Management, LLC | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 266 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 267 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Jul 2025 |
| 268 | Rose Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2002 |
| 269 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | Jul 2025 |
| 270 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 271 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 272 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 273 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Jul 2025 |
| 274 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 275 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 276 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 277 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 278 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 279 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 280 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 281 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 282 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 283 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 284 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 285 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 286 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 287 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 288 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Dec 2024 |
| 289 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 290 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 291 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 292 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 293 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 294 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 295 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 296 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Jul 2025 |
| 297 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 298 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 299 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 300 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |