| 301 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 302 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 303 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | May 2025 |
| 304 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 305 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 306 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 307 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 308 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 309 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 310 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 311 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 312 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 313 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 314 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 315 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 316 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 317 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 318 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 319 | Mission Exploration, Inc. | Tolar, TX 76476 | Oil & Gas Operator | Dec 1987 |
| 320 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 321 | Mitchell, James - Operator | Lamesa, TX 79331 | Oil & Gas Operator | Mar 2008 |
| 322 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | May 2025 |
| 323 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | May 2025 |
| 324 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 325 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 326 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 327 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 328 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | May 2025 |
| 329 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 330 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 331 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Mar 2024 |
| 332 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 333 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 334 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 335 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 336 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 337 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | May 2025 |
| 338 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 339 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 340 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 341 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 342 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 343 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 344 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 345 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 346 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 347 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 348 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 349 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 350 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 351 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 352 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 353 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 354 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 355 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 356 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 357 | Opal Resources Operating Co.,LLC | Cypress, TX 77429 | Oil & Gas Operator | Jan 2019 |
| 358 | Otb Operating, LLC | Stanton, TX 79782 | Oil & Gas Operator | May 2025 |
| 359 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 360 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 361 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 362 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 363 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 364 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 365 | Pangea Corporation | San Angelo, TX 76904 | Oil & Gas Operator | May 2025 |
| 366 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 367 | Parish, John R. | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 368 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 369 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 370 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 371 | Parsley Energy Operations, LLC | Irving, TX 75038 | Oil & Gas Operator | Jan 2021 |
| 372 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Aug 2003 |
| 373 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 374 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 375 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 376 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 377 | Pbex Operations, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 378 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 379 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 380 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 381 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 382 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 383 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 384 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | May 2025 |
| 385 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 386 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 387 | Petrolegacy Energy II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2023 |
| 388 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 389 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 390 | Petx Operating LLC | Sheridan, WY 82801 | Oil & Gas Operator | May 2025 |
| 391 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 392 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 393 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 394 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 395 | Pinon Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 396 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 397 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 398 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 399 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 400 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |