| 301 | JRC Petroleum | Pecos, TX 79772 | Oil & Gas Operator | Dec 2025 |
| 302 | K3 Productions LLC | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 303 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 304 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Oct 2025 |
| 305 | Keystone Petroleum NM LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 306 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 307 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 308 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 309 | Kimlar Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Dec 2025 |
| 310 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 311 | Kinder Morgan Tejas Pipeline LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 312 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Dec 2025 |
| 313 | Kojo Energy, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 314 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 315 | La Roca Energy, LP | Dallas, TX 75207 | Oil & Gas Operator | May 2024 |
| 316 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 317 | Lakewood Energy LLC | Dallas, TX 75214 | Oil & Gas Operator | Dec 2025 |
| 318 | Landrick O & G Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 319 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 320 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2025 |
| 321 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 322 | Lbo Energy, Inc. | Kentfield, CA 94914 | Gas Operator | Nov 2002 |
| 323 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2025 |
| 324 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 325 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 326 | Linop Corporation | Austin, TX 78728 | Oil & Gas Operator | Dec 2025 |
| 327 | Little, Quintin Company,Inc.,The | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 328 | LNH Oil Company | Midland, TX 79708 | Oil & Gas Operator | Jan 2006 |
| 329 | Lobo Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 330 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 331 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 332 | Lone Star Services | Pecos, TX 79772 | Oil & Gas Operator | Dec 2025 |
| 333 | Lonestar Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 334 | Los Hijos De Sanchez J LLC | Beeville, TX 78102 | Oil Operator | Dec 2025 |
| 335 | Louisiana Minerals, LTD. | Houston, TX 77024 | Oil & Gas Operator | Jul 1988 |
| 336 | Luxe Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2021 |
| 337 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 338 | Madison And Wright LLC | The Colony, TX 75056 | Oil & Gas Operator | Dec 2025 |
| 339 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Dec 2025 |
| 340 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 341 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 342 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 343 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 344 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 345 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 346 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 347 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 348 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 349 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 350 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 351 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 352 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Dec 2025 |
| 353 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 354 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 355 | McDonald, Richard A. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Dec 2025 |
| 356 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 357 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 358 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 359 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 360 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 361 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 362 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 363 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 364 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2025 |
| 365 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 366 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 367 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 368 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 369 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 370 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 371 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 372 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 373 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 374 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 375 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 376 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 377 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 378 | Moss, William Corp. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2002 |
| 379 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 380 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 381 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 382 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2025 |
| 383 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 384 | N & B Oil And Gas LLC | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 385 | Naco Production | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |
| 386 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 387 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 388 | Nesitor West Texas LLC | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 389 | New Horizon Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2006 |
| 390 | Newman Cubed, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 391 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 392 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 393 | North Operating Company | Canton, TX 75103 | Oil & Gas Operator | Dec 2025 |
| 394 | Norwood, A. N., Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 395 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 396 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 397 | O'Neill Properties, LTD. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 398 | O'Ryan Oil And Gas | Odessa, TX 79768 | Oil & Gas Operator | Dec 2025 |
| 399 | O. H. M. Operating | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 400 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |