| 301 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 302 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 303 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 304 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 305 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 306 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Apr 2026 |
| 307 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2026 |
| 308 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 309 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 310 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 311 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 312 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 313 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 314 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 315 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 316 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 317 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Apr 2026 |
| 318 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 319 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Apr 2026 |
| 320 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 321 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 322 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 323 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 324 | Mitchell, James - Operator | Lamesa, TX 79331 | Oil & Gas Operator | Mar 2008 |
| 325 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Apr 2026 |
| 326 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2026 |
| 327 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 328 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 329 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2026 |
| 330 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | Jan 2026 |
| 331 | Mule Kick Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 332 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 333 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2026 |
| 334 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 335 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 336 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 337 | Murphy Oil USA, Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 338 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 339 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 340 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Apr 2026 |
| 341 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 342 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Apr 2026 |
| 343 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2026 |
| 344 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 345 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2026 |
| 346 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 347 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 348 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 349 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 350 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 351 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 352 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 353 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 354 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 355 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 356 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 357 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 358 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 359 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 360 | Opal Resources Operating Co.,LLC | Cypress, TX 77429 | Oil & Gas Operator | Jan 2019 |
| 361 | Otb Operating, LLC | Stanton, TX 79782 | Oil & Gas Operator | Apr 2026 |
| 362 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 363 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 364 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 365 | Oxyrock Operating, LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 366 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 367 | Pactola Development Co | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2004 |
| 368 | Pangea Corporation | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2026 |
| 369 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 370 | Parish, John R. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 371 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 372 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 373 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 374 | Parsley Energy Operations, LLC | Irving, TX 75038 | Oil & Gas Operator | Jan 2021 |
| 375 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 376 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 377 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 378 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 379 | Pbex Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Apr 2017 |
| 380 | Pbex Operations, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 381 | Pbex-MCM Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 382 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 383 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 384 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 385 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 386 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 387 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 388 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | Apr 2026 |
| 389 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 390 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 391 | Petrolegacy Energy II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2023 |
| 392 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 393 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 394 | Petx Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 395 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 396 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 397 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 398 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 399 | Pinon Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 400 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |