| 301 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 302 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 303 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 304 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 305 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 306 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 307 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 308 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 309 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2026 |
| 310 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 311 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 312 | Moody Oil Co. | Pearsall, TX 78061 | Oil & Gas Operator | Apr 2026 |
| 313 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 314 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 315 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 316 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2026 |
| 317 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 318 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 319 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 320 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Apr 2026 |
| 321 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Apr 2026 |
| 322 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 323 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Apr 2026 |
| 324 | Nec Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2026 |
| 325 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2026 |
| 326 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 327 | New Height Energy, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2026 |
| 328 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 329 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 330 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 331 | NRG Assets Management, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2016 |
| 332 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Apr 2026 |
| 333 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 334 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 335 | Occidental Energy Marketing, Inc. | Houston, TX 77227 | Gas Operator | Sep 2015 |
| 336 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 337 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 338 | Odessa Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 339 | Ogx Resources LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2011 |
| 340 | Oklahoma Arrowhead Energy, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 1996 |
| 341 | Omar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 342 | Onaroll Operating LLC | Lubbock, TX 79423 | Oil Operator | Apr 2026 |
| 343 | Osborn,W.B. Oil & Gas Operations | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2026 |
| 344 | Oxy USA WTP LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 345 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2026 |
| 346 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2026 |
| 347 | Paladin Exploration Co., Inc. | Plano, TX 75093 | Oil & Gas Operator | Feb 1995 |
| 348 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 349 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 350 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Apr 2026 |
| 351 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 352 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2026 |
| 353 | Par Producing Company | Snyder, TX 79550 | Oil & Gas Operator | Jun 2017 |
| 354 | Parallel Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Jan 2010 |
| 355 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 356 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 357 | Patoil Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Aug 2003 |
| 358 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 359 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 360 | Patriot Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 361 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 362 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 363 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 364 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 365 | Pedernales Production, LP | Houston, TX 77057 | Oil & Gas Operator | Mar 2022 |
| 366 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 367 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 368 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 369 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 370 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 371 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | Apr 2026 |
| 372 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 373 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 374 | Petro Hi-Tech, Inc. | Pasadena, TX 77505 | Oil & Gas Operator | Feb 2008 |
| 375 | Petro-West Corporation | Lubbock, TX 79404 | Oil & Gas Operator | Oct 2001 |
| 376 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 377 | Petromining, Inc. | Plano, TX 75026 | Oil & Gas Operator | Apr 2026 |
| 378 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 379 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 380 | Petrotex, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 381 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 382 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 383 | Pie Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2026 |
| 384 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 385 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 386 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 387 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 388 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 389 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 390 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 391 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 392 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 393 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2026 |
| 394 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 395 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 396 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Apr 2026 |
| 397 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 398 | Qualia, C. F. Operating,Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2013 |
| 399 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2026 |
| 400 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |