| 301 | Koontz Oil Company | Nocona, TX 76255 | Oil Operator | Aug 2022 |
| 302 | Kramer, Clifford A. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 1997 |
| 303 | Kroh Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 304 | L & L Resources, Inc. | Hays, KS 67601 | Oil Operator | Mar 1986 |
| 305 | L2SG Production, LLC | Nocona, TX 76255 | Oil Operator | May 2020 |
| 306 | La Mar, Paul W. | Nocona, TX 76255 | Oil & Gas Operator | May 1995 |
| 307 | Lakota Energy, LTD. | Paradise, TX 76073 | Oil & Gas Operator | Dec 2025 |
| 308 | Lamar Energy | Nocona, TX 76255 | Oil Operator | Dec 2025 |
| 309 | Lamar Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Oct 2015 |
| 310 | Lamco Oil, LLC | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 311 | Large Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Dec 2025 |
| 312 | LC Operating, LLC | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2025 |
| 313 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 314 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 315 | Lindemann, Robert Operating | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 316 | Lindemann, W. L., DRLG. Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1994 |
| 317 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 318 | Los Hijos De Sanchez J LLC | Beeville, TX 78102 | Oil Operator | Dec 2025 |
| 319 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 320 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 321 | Madison Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 322 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 323 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 324 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 325 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 326 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 327 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 328 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Dec 2025 |
| 329 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 330 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 331 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 332 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 333 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 334 | McCommons Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 335 | McCormack, Paul H. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2003 |
| 336 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 337 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 338 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 339 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 340 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 341 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Dec 2025 |
| 342 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2025 |
| 343 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 344 | Miles Production Co. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2008 |
| 345 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 346 | Miller, Glenn J. | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 347 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 348 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Dec 2025 |
| 349 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 350 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | Dec 2025 |
| 351 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 352 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 353 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 354 | Nautilus Exploration, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 2021 |
| 355 | Newark E&P Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2017 |
| 356 | Newark Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 357 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 358 | NHRG Inc | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 359 | Nichols Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 360 | Nichols, Carl E. | Azle, TX 76098 | Oil & Gas Operator | Aug 2004 |
| 361 | Nichols, John Wesley | Little Elm, TX 75068 | Oil & Gas Operator | Jul 2011 |
| 362 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 363 | Nortex Energy, Inc. | Muenster, TX 76252 | Oil Operator | Dec 2025 |
| 364 | Northridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 365 | O'Neal Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 366 | O'Neal Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1999 |
| 367 | O'Neal, Lindell | Nocona, TX 76255 | Oil & Gas Operator | Aug 2025 |
| 368 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 369 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 370 | Oexco, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 371 | Ok Arena Operating Company | Oklahoma City, OK 73101 | Oil & Gas Operator | Dec 2025 |
| 372 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 373 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 374 | Osborn,W.B. Oil & Gas Operations | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 375 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 376 | Ozark Exploration, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 377 | Pangea Corporation | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 378 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 379 | Patrick & Hadley | Nocona, TX 76255 | Oil & Gas Operator | Jul 1999 |
| 380 | Patrick, G.R. | Nocona, TX 76255 | Oil Operator | Dec 2025 |
| 381 | Patrick, George & Patrick, Roger | Nocona, TX 76255 | Oil & Gas Operator | Jul 1999 |
| 382 | Payne, W. C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2005 |
| 383 | Peak Flow Operating&Drilling LP | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2011 |
| 384 | Peba Oil & Gas Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Jun 2015 |
| 385 | Peba Oil & Gas, Inc. | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 386 | Penny, Ralph E. | White Plains, NY 10601 | Oil & Gas Operator | Jul 2023 |
| 387 | Person, J.S., Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 388 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2025 |
| 389 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 390 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 391 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 392 | PG-M International Operating,LLC | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 393 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 394 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2025 |
| 395 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 396 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 397 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 398 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 399 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Dec 2025 |
| 400 | Poteet Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 1994 |