| 301 | Jin Petroleum LLC | New Braunfels, TX 78130 | Oil Operator | Nov 2025 |
| 302 | JJH Energy Company | Odessa, TX 79765 | Gas Operator | Nov 2025 |
| 303 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 304 | Johnson & Lindley, Inc. | Houston, TX 77227 | Oil & Gas Operator | May 2013 |
| 305 | Jones, Johnny G. | Midland, TX 79708 | Oil & Gas Operator | Feb 2000 |
| 306 | Josey Oil Company | Houston, TX 77019 | Oil & Gas Operator | Jul 2006 |
| 307 | Jtex Oil Company, LLC | Colorado City, TX 79512 | Oil & Gas Operator | Jan 2025 |
| 308 | Jubilee Oil And Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2009 |
| 309 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 2025 |
| 310 | K.W.A., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 311 | K3 Productions LLC | Houston, TX 77269 | Oil & Gas Operator | Nov 2025 |
| 312 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Nov 2025 |
| 313 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jul 2025 |
| 314 | Kern Co. | Houston, TX 77095 | Oil & Gas Operator | Jan 2021 |
| 315 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 316 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 317 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Nov 2025 |
| 318 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 319 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 320 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 321 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 322 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Nov 2025 |
| 323 | Krisco Oil Co. | Kermit, TX 79745 | Oil Operator | Jul 2022 |
| 324 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Nov 2025 |
| 325 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Nov 2025 |
| 326 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 327 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Nov 2025 |
| 328 | Last Mile Production, LLC | Southlake, TX 76092 | Oil & Gas Operator | Nov 2025 |
| 329 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 330 | LDF Energy, LLC | Midland, TX 79707 | Oil & Gas Operator | Nov 2025 |
| 331 | Lee Production Co. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 332 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 333 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Nov 2025 |
| 334 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 335 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 336 | LNH Oil Company | Midland, TX 79708 | Oil & Gas Operator | Jan 2006 |
| 337 | Lone Star Services | Pecos, TX 79772 | Oil & Gas Operator | Nov 2025 |
| 338 | Lonesome B, LLC | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 339 | Longhorn Service & Drilling Co. | Kermit, TX 79745 | Oil & Gas Operator | Jun 2019 |
| 340 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Nov 2025 |
| 341 | Luxe Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2021 |
| 342 | Lyn-San Company | Midland, TX 79708 | Oil & Gas Operator | Dec 2018 |
| 343 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Jun 2025 |
| 344 | M R Ventures LLC | Dallas, TX 75367 | Oil & Gas Operator | Aug 2025 |
| 345 | M T M Oil | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 346 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 347 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 348 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Nov 2025 |
| 349 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Nov 2025 |
| 350 | Makk Oil Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 351 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 352 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 353 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2025 |
| 354 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 355 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 356 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Sep 2025 |
| 357 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Nov 2025 |
| 358 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 359 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 360 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Jun 2025 |
| 361 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Nov 2025 |
| 362 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 363 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 364 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 365 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 366 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Nov 2025 |
| 367 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 368 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Nov 2025 |
| 369 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 370 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 371 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 372 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 373 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 374 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 375 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 376 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Nov 2025 |
| 377 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Nov 2025 |
| 378 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 379 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | May 2025 |
| 380 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 381 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 382 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 383 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 384 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2025 |
| 385 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 386 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Nov 2025 |
| 387 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 388 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 389 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2025 |
| 390 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Nov 2025 |
| 391 | Moore Gas And Oil | Monahans, TX 79756 | Oil Operator | Nov 2025 |
| 392 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 393 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 394 | Morningstar Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2022 |
| 395 | Mosaic Pecos LLC | Dallas, TX 75367 | Oil Operator | Nov 2025 |
| 396 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 397 | Moseley, J. T. | Temple, TX 76502 | Oil & Gas Operator | Sep 2008 |
| 398 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 399 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 400 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |