| 301 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2025 |
| 302 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 303 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 304 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 305 | JMW Resources, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 306 | Jones, Johnny G. | Midland, TX 79708 | Oil & Gas Operator | Feb 2000 |
| 307 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 308 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 309 | K & K Oil Co. | Corsicana, TX 75109 | Oil & Gas Operator | Mar 2025 |
| 310 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 311 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 312 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 313 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 314 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 315 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 316 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 317 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 318 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 319 | Kindred Petroleum Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 320 | King Energy Resources | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2025 |
| 321 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 322 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Mar 2025 |
| 323 | Kodiak Productions LTD | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2014 |
| 324 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 325 | Ksabe Energy Partners, LLC | Oklahoma City, OK 73106 | Oil Operator | Mar 2025 |
| 326 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2023 |
| 327 | L & B Production | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 328 | L & D, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 329 | L & M Operating, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 330 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 331 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 332 | Ladd Operating Company | Midland, TX 79711 | Oil & Gas Operator | Mar 2008 |
| 333 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Mar 2025 |
| 334 | Laredo Petroleum - Dallas, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 2014 |
| 335 | Laredo Petroleum, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 336 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Mar 2025 |
| 337 | Laron Oil Corporation | Seguin, TX 78155 | Oil & Gas Operator | Jul 1997 |
| 338 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 339 | Last Dollar LLC | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 340 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 341 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 342 | Lemon, Richard F. Jr. | Carrollton, TX 75006 | Oil & Gas Operator | Mar 2025 |
| 343 | Lewis, James B. Land & Oil Co. | Midland, TX 79702 | Oil & Gas Operator | Nov 1998 |
| 344 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 345 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 346 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Mar 2025 |
| 347 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 348 | Lone Star Oil & Gas | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 349 | Lubbock Energy, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Oct 1996 |
| 350 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2025 |
| 351 | M & M Production LTD. | Midland, TX 79704 | Oil & Gas Operator | Mar 2025 |
| 352 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 353 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 354 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 355 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 356 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 357 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 358 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Mar 2025 |
| 359 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 360 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 361 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2025 |
| 362 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 363 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 364 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Mar 2025 |
| 365 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 366 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2025 |
| 367 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2025 |
| 368 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 369 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 370 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Mar 2025 |
| 371 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 372 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 373 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 374 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 375 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 376 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 377 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 378 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 379 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Mar 2025 |
| 380 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 381 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 382 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 383 | Millennium Resources, LLC. | Big Lake, TX 76932 | Oil & Gas Operator | Sep 2012 |
| 384 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 385 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2025 |
| 386 | Minute Hand LLC | Brenham, TX 77834 | Oil & Gas Operator | Mar 2025 |
| 387 | Mirando Crude Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 1994 |
| 388 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 389 | MLC Co., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 1996 |
| 390 | MM China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Mar 2025 |
| 391 | Moontower Resources Op, LLC | Austin, TX 78732 | Oil & Gas Operator | Mar 2025 |
| 392 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 393 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 394 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 395 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 396 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Mar 2025 |
| 397 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 398 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 399 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 400 | NGL Crude Logistics LLC | Denver, CO 80209 | Oil Operator | Dec 2024 |