| 301 | Kendrick Oil Co. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 302 | Killion Well Service Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2014 |
| 303 | Kilpatrick Production Company | Tye, TX 79563 | Oil & Gas Operator | Mar 2025 |
| 304 | King Energy Resources | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2025 |
| 305 | Kroh Operating LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Mar 2025 |
| 306 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | Mar 2025 |
| 307 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 308 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 309 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 310 | Langford, G. E. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2002 |
| 311 | Lapco Oil & Gas Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2015 |
| 312 | Larry Oil, Inc. | Albany, TX 76430 | Oil & Gas Operator | Nov 2001 |
| 313 | Lawrence Energy Company | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 314 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 315 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 316 | Ledbetter, Morris | Abilene, TX 79605 | Oil & Gas Operator | Jun 2005 |
| 317 | Ledbetter, O. H. | Albany, TX 76430 | Oil & Gas Operator | Mar 1997 |
| 318 | Leffel'S, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2020 |
| 319 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Mar 2025 |
| 320 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 321 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 322 | Llewellin Operating Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2017 |
| 323 | Lobo Oil Company | Woodson, TX 76491 | Oil & Gas Operator | Sep 1999 |
| 324 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 325 | Low-End Oil LLC | Austin, TX 78748 | Oil Operator | Mar 2025 |
| 326 | Lowe, Dean | Albany, TX 76430 | Oil Operator | Mar 2025 |
| 327 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Mar 2025 |
| 328 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 329 | M & M Oil & Gas Exploration Inc | Abilene, TX 79601 | Oil & Gas Operator | Mar 2008 |
| 330 | M H W, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Jul 1996 |
| 331 | M.J.O.G., Inc. | Fort Smith, AR 72903 | Oil Operator | Mar 2015 |
| 332 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 333 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 334 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 335 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 336 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 337 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 338 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2025 |
| 339 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 340 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 341 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 342 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Mar 2025 |
| 343 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 344 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 345 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 346 | MCD, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 347 | McKay Oil | Portales, NM 88130 | Oil & Gas Operator | Apr 1996 |
| 348 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 349 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Mar 2025 |
| 350 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 351 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 352 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Mar 2025 |
| 353 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 354 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 355 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Mar 2025 |
| 356 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 357 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 358 | Millennium Operating Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 359 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 360 | Mist Prod. & Exploration Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 361 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Mar 2025 |
| 362 | Mole Hole Prod. | Bridgeport, TX 76426 | Oil Operator | Mar 2025 |
| 363 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 364 | Montgomery Royalty | Moran, TX 76464 | Oil & Gas Operator | Mar 2025 |
| 365 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 366 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 367 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 368 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Mar 2025 |
| 369 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Mar 2025 |
| 370 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 371 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 372 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Mar 2025 |
| 373 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 374 | Neatherlin, Earl Inc. | Avoca, TX 79503 | Oil & Gas Operator | Mar 2025 |
| 375 | Neff, Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2018 |
| 376 | Ngezi, LCC | Fort Worth, TX 76111 | Oil & Gas Operator | Mar 2025 |
| 377 | Nick Oil | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 378 | Nordan Oil & Gas Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2018 |
| 379 | North American Exploration Co. | Abilene, TX 79602 | Oil & Gas Operator | Apr 1998 |
| 380 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 381 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 382 | O'Leary'S Oil & Gas Inc. | Arcadia, FL 34266 | Oil & Gas Operator | May 2008 |
| 383 | Oaktree Oil Company | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 384 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 385 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 386 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 387 | Ole, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 388 | One Epoch Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 389 | Orland Oil & Gas LLC | FT Lauderdale, FL 33305 | Oil Operator | Mar 2025 |
| 390 | Overland Operating Company, LLC | Abilene, TX 79601 | Oil Operator | Mar 2025 |
| 391 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 392 | P&P Industries, Inc. | Austin, TX 78737 | Oil & Gas Operator | Dec 2002 |
| 393 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 394 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 395 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Mar 2025 |
| 396 | P.I.D. Drilling Inc | Clyde, TX 79510 | Oil & Gas Operator | Mar 2025 |
| 397 | Pace Operating | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 398 | Paradigm Petroleum Corporation | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 399 | Paragon Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 400 | Pardue Energy Inc. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2015 |