| 201 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 202 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 203 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 204 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 205 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | May 2025 |
| 206 | Moore, John D. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 207 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 208 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 209 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 210 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 211 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 212 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2024 |
| 213 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 214 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | May 2025 |
| 215 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 216 | Offset Oil & Gas | Big Spring, TX 79720 | Oil & Gas Operator | Aug 2003 |
| 217 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 218 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Jan 2025 |
| 219 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 220 | Osr Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Jul 2000 |
| 221 | Owl Operating Ventures L.L.C. | Midland, TX 79708 | Oil & Gas Operator | Dec 2022 |
| 222 | Owl Ops LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 223 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 224 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 225 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 226 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 227 | P1 Energy, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 228 | P4 Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 229 | Parapetroleum | Kerrville, TX 78028 | Oil & Gas Operator | Feb 1997 |
| 230 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 231 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 232 | Partee Drilling Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 233 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 234 | Penergy | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 235 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 236 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 237 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 238 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 239 | Pima Energy, LLC | Knott, TX 79748 | Oil & Gas Operator | May 2025 |
| 240 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 241 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 242 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 243 | Powell, A. Brandt | Coleman, TX 76834 | Oil & Gas Operator | Mar 1999 |
| 244 | Powell, A. Brandt Co. | Hawley, TX 79525 | Oil & Gas Operator | May 2025 |
| 245 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 246 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 247 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 248 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 249 | Quail Ridge Petroleum LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 250 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2025 |
| 251 | Quay Valley, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2007 |
| 252 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 253 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 254 | Rayden | Midland, TX 79711 | Oil & Gas Operator | May 2025 |
| 255 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 256 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 257 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 258 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | May 2025 |
| 259 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 260 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 261 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | May 2025 |
| 262 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | May 2025 |
| 263 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 264 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 265 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 266 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 267 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 268 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 269 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 270 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 271 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 272 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 273 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 274 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 275 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 276 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 277 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 278 | Siana Oil & Gas | Conroe, TX 77305 | Oil & Gas Operator | May 2025 |
| 279 | Sigma Oper & Develop Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 280 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 281 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 282 | Sledge, H. G., Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2016 |
| 283 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 284 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 285 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 286 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 287 | SS Operating LLC | Water Valley, TX 76958 | Oil Operator | May 2025 |
| 288 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2025 |
| 289 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 290 | Stanolind Production LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 291 | Steller Energy & Investment Corp | Plano, TX 75093 | Oil & Gas Operator | Feb 2021 |
| 292 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 293 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 294 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | May 2025 |
| 295 | Stickney Oil & Gas, Inc. | Midland, TX 79704 | Oil & Gas Operator | Nov 2014 |
| 296 | Stickney, F. C., Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 1998 |
| 297 | Strand Energy, Inc. (I) | Houston, TX 77002 | Oil & Gas Operator | Sep 1996 |
| 298 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 299 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 300 | Tall Dune Resources, LLC | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |