| 301 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 302 | Lindley, J. R. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2002 |
| 303 | Lindsay Oil Operations | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2010 |
| 304 | Lindsay, Robert L. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1995 |
| 305 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 306 | Livingston, David Oil Company | Haskell, TX 79521 | Oil & Gas Operator | Aug 2003 |
| 307 | Livingston, F. L. | Megargel, TX 76370 | Oil & Gas Operator | May 2018 |
| 308 | Lobo Oil Company | Woodson, TX 76491 | Oil & Gas Operator | Sep 1999 |
| 309 | Longhorn Oil Properties, Inc. | Pottsboro, TX 75076 | Oil & Gas Operator | Dec 2025 |
| 310 | LT Oil Company | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 311 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Oct 2025 |
| 312 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 313 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 314 | Mahler, Kelly Operating | Graham, TX 76450 | Oil & Gas Operator | Mar 2017 |
| 315 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Dec 2025 |
| 316 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 317 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 318 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 319 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 320 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 321 | Masada Oil & Gas Company LTD. | Abilene, TX 79603 | Oil & Gas Operator | Dec 2025 |
| 322 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 323 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 324 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Dec 2025 |
| 325 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Dec 2025 |
| 326 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Dec 2025 |
| 327 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 328 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 329 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 330 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 331 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 332 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 333 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 334 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 335 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 336 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 337 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 338 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Dec 2025 |
| 339 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 340 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 341 | Misener Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2010 |
| 342 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 343 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 344 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 345 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 346 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 347 | Moore, Miles Inc. | Moran, TX 76464 | Oil & Gas Operator | Dec 2025 |
| 348 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 349 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 350 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 351 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 352 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 353 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 354 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 355 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 356 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 357 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 358 | Neatherlin, Earl Inc. | Avoca, TX 79503 | Oil & Gas Operator | Dec 2025 |
| 359 | Neet Transport Co., Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Dec 2025 |
| 360 | New Atlantis Oil & Expl., LLC | Big Spring, TX 79721 | Oil & Gas Operator | Feb 2012 |
| 361 | New Era International | Graham, TX 76450 | Oil & Gas Operator | Sep 2017 |
| 362 | Newark Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 363 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 364 | NKC Energy, LLC | Bruceville, TX 76630 | Oil Operator | Dec 2025 |
| 365 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 366 | Norman, C. D. | Irving, TX 75015 | Oil & Gas Operator | Mar 2008 |
| 367 | North American Exploration Co. | Abilene, TX 79602 | Oil & Gas Operator | Apr 1998 |
| 368 | North Texas Oil & Gas, LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 369 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 370 | NWG Operating LLC | Canyon, TX 79015 | Oil & Gas Operator | Dec 2025 |
| 371 | Nytex Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2014 |
| 372 | O & G Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 1996 |
| 373 | Oakridge Energy, Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2025 |
| 374 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 375 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 376 | Okreek Oil Company | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 377 | Older Than Dirt LLC | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 378 | Opco Oil & Gas Co. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2003 |
| 379 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 380 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 381 | Osceola Oil & Gas Corporation | Somerset, TX 78069 | Oil & Gas Operator | Aug 1994 |
| 382 | Ouida Oil | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2008 |
| 383 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 384 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 385 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | Dec 2025 |
| 386 | P.R.F. Enterprises, LLC | College Sta, TX 77842 | Oil Operator | Dec 2025 |
| 387 | Palmer Tank Trucks, Inc. | Olney, TX 76374 | Oil & Gas Operator | Mar 2008 |
| 388 | Palmer, John LLC | Megargel, TX 76370 | Oil & Gas Operator | Dec 2025 |
| 389 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 390 | Paragon Oil & Gas, LLC | Aledo, TX 76008 | Oil & Gas Operator | Dec 2025 |
| 391 | Pardue Energy Inc. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2015 |
| 392 | Pardue Oil | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2006 |
| 393 | Pardue Oil, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 394 | Pardue, William M., III | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 1996 |
| 395 | Parker Energy Company | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 396 | Paschal Petroleum, Inc. | Dallas, TX 75380 | Oil & Gas Operator | Apr 1994 |
| 397 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 398 | Patterson Petroleum, Inc. | Snyder, TX 79550 | Oil & Gas Operator | Feb 2000 |
| 399 | Payne-Johnston | Tyler, TX 75702 | Oil & Gas Operator | Nov 1996 |
| 400 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Dec 2025 |