| 301 | LGDC Corporation | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 302 | Linan Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 303 | Linc Gulf Coast Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 304 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 305 | Live Oak Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 306 | Llox, L.L.C. | Covington, LA 70433 | Oil & Gas Operator | May 2025 |
| 307 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 308 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | May 2025 |
| 309 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | May 2025 |
| 310 | Lundberg Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2002 |
| 311 | Lusk Nominee Trust | Houston, TX 77098 | Oil & Gas Operator | Jul 2019 |
| 312 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 313 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 314 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 315 | Mamerow Energy Corp | Ganado, TX 77962 | Oil & Gas Operator | May 2025 |
| 316 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | May 2025 |
| 317 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 318 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Feb 2025 |
| 319 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 320 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 321 | Martin, William C. | Houston, TX 77071 | Oil & Gas Operator | May 2025 |
| 322 | Martino, Joseph C. | Pasadena, TX 77504 | Oil & Gas Operator | May 2025 |
| 323 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 324 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 325 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 326 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 327 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | May 2025 |
| 328 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 329 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 330 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 331 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Mar 2025 |
| 332 | McGowan Working Partners | Jackson, MS 39296 | Oil & Gas Operator | Dec 2000 |
| 333 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | May 2025 |
| 334 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 335 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 336 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 337 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 338 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | May 2025 |
| 339 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 340 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 341 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 342 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | May 2025 |
| 343 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 344 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 345 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 346 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 347 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 348 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 349 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 350 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 351 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 352 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 353 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 354 | Nadsoilco LLC | Chicago, IL 60606 | Oil & Gas Operator | May 2025 |
| 355 | Nance Engineering Inc. | Houston, TX 77058 | Oil & Gas Operator | Mar 2002 |
| 356 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 357 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | May 2025 |
| 358 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 359 | Nitro-Lift/Ok Manufacturing, LLC | | Oil Operator | May 2025 |
| 360 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 361 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2025 |
| 362 | North American Reserve Corp. | Houston, TX 77060 | Oil & Gas Operator | Oct 2010 |
| 363 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 364 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 365 | Noxxe Oil And Gas, LLC | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 366 | Oil Coast Corp. | S Houston, TX 77587 | Oil & Gas Operator | May 2025 |
| 367 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 368 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 369 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 370 | Owl Creek Production Co., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2006 |
| 371 | Ows Energy, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 372 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 373 | P.B. Blue Dot Properties | Wexford, PA 15090 | Oil & Gas Operator | May 2025 |
| 374 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | May 2025 |
| 375 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | May 2025 |
| 376 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 377 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 378 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 379 | Patriot Operating Company, Inc. | Houston, TX 77008 | Oil & Gas Operator | Sep 2003 |
| 380 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 381 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 382 | Peregrine Energy, Inc. | Spring, TX 77393 | Oil & Gas Operator | Jul 1999 |
| 383 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | May 2025 |
| 384 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jan 2025 |
| 385 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 386 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 387 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 388 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 389 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 390 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | May 2025 |
| 391 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 392 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 393 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 394 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | May 2025 |
| 395 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 396 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 397 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 398 | PLR Energy, LLC | Houston, TX 77079 | Oil Operator | May 2018 |
| 399 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 400 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |