| 201 | MCD, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 202 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 203 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Dec 2025 |
| 204 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Dec 2025 |
| 205 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Sep 2025 |
| 206 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 207 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 208 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 209 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 210 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 211 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 212 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 213 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 214 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 215 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 216 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Aug 2025 |
| 217 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 218 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 219 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 220 | Moore, John D. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 221 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 222 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 223 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 224 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Dec 2025 |
| 225 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 226 | North American Exploration Co. | Abilene, TX 79602 | Oil & Gas Operator | Apr 1998 |
| 227 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 228 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 229 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 230 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 231 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 232 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 233 | Ops Group Limited | Houston, TX 77060 | Oil & Gas Operator | Jun 2014 |
| 234 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 235 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 236 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 237 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 238 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 239 | Pace Production Co. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 240 | Par Producing Company | Snyder, TX 79550 | Oil & Gas Operator | Jun 2017 |
| 241 | Paragon Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 242 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 243 | Paris Petroleum Corporation | Bellaire, TX 77402 | Oil & Gas Operator | Oct 1997 |
| 244 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 245 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 246 | Partee Drilling Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 247 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 248 | Patterson, Ben M., Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2003 |
| 249 | Patton Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 250 | Pearl, Bill H. Productions, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 2025 |
| 251 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 252 | Perkins-Prothro Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2002 |
| 253 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 254 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 255 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 256 | Pinon Petroleum, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Apr 2004 |
| 257 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 258 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 259 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 260 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 261 | Pontotoc Oil Corp. | Midland, TX 79702 | Oil & Gas Operator | Feb 1996 |
| 262 | Price, W. H. & Sons | Granbury, TX 76048 | Oil & Gas Operator | Nov 1997 |
| 263 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 264 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 265 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2025 |
| 266 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Dec 2025 |
| 267 | Quail Ridge Petroleum LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 268 | Quail Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 269 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2025 |
| 270 | R & P Operating | Tuscola, TX 79562 | Oil & Gas Operator | Jun 1997 |
| 271 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 272 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 273 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 274 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 275 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 276 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 277 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 278 | Retriever Operating LLC | Midland, TX 79704 | Oil Operator | Dec 2025 |
| 279 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 280 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 281 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Dec 2025 |
| 282 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 283 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 284 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |
| 285 | RRG Operating, LLC | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 286 | Rust Oil Corp. | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2025 |
| 287 | Ryholland Fielder, Inc | Delray Beach, FL 33446 | Oil & Gas Operator | Dec 2025 |
| 288 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 289 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 290 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 291 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 292 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 293 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 294 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Dec 2025 |
| 295 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 296 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 297 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 298 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Aug 2025 |
| 299 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Dec 2025 |
| 300 | Sierra Lima Oil & Gas, LLC | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |