| 301 | JM Investments, L.L.C. | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 302 | Johnson, William D. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2008 |
| 303 | Jones Company, LTD. | Albany, TX 76430 | Oil & Gas Operator | May 1999 |
| 304 | Kadane Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1998 |
| 305 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 306 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 307 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Oct 2025 |
| 308 | Keating Energy, Inc. | FT Washington, PA 19034 | Oil & Gas Operator | Feb 2026 |
| 309 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 310 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 311 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 312 | Killion Well Service Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2014 |
| 313 | Kimble Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2006 |
| 314 | Kimbrel Oil Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2026 |
| 315 | Klingberg, Roger | Cross Plains, TX 76443 | Oil & Gas Operator | Jan 2017 |
| 316 | Kokomo Energy, Inc. | Gorman, TX 76454 | Oil & Gas Operator | Feb 2026 |
| 317 | Kornye-Tillman Company | Cleburne, TX 76031 | Oil & Gas Operator | Feb 2026 |
| 318 | Kramer Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 319 | Kramer, Frank & Ethel FLP | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 320 | Kramer, Frank C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 321 | Kroh Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 322 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 323 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 324 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Feb 2026 |
| 325 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 326 | Langford, G. E. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2002 |
| 327 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 328 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 329 | Leading Edge Energy LLC | San Antonio, TX 78205 | Oil Operator | Feb 2026 |
| 330 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 331 | Ledbetter, Jerald D. Estate Of | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 332 | Ledbetter, Jerald D. Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2007 |
| 333 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 334 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 335 | Liberty Resources Co. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 1994 |
| 336 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 337 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 338 | Llewellin Operating Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2017 |
| 339 | Lobo Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 1995 |
| 340 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 341 | Lone Star Pipeline Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 342 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 343 | Los Hijos De Sanchez J LLC | Beeville, TX 78102 | Oil Operator | Feb 2026 |
| 344 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 345 | Lowrance Inc. | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 346 | LSM Ventures, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2020 |
| 347 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 348 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 349 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 350 | M H W, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Jul 1996 |
| 351 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 352 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 353 | Marbil Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jun 2013 |
| 354 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 355 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 356 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 357 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 358 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 359 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 360 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2026 |
| 361 | McAlmond Oil Company | Fort Worth, TX 76136 | Oil & Gas Operator | Apr 2022 |
| 362 | McBride Production Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1993 |
| 363 | McClymond, B. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2020 |
| 364 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 365 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 366 | McCrea Exploration Company, Inc. | Carrollton, TX 75007 | Oil & Gas Operator | Nov 1995 |
| 367 | McCurdy Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 368 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 369 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | Feb 2026 |
| 370 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | Feb 2026 |
| 371 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 372 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 373 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 374 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 375 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 376 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 377 | Micro Operating, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 378 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 379 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 380 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Feb 2026 |
| 381 | Misener Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2010 |
| 382 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 383 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 384 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Dec 2025 |
| 385 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 386 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 387 | Mogul Resources, LLC | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 388 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 389 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 390 | Montgomery Royalty | Moran, TX 76464 | Oil & Gas Operator | Feb 2026 |
| 391 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 392 | Mormar Family Holdings, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Feb 2026 |
| 393 | Morrow, Anthony | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 394 | Morton Valley Oil & Gas, Inc. | Dallas, TX 75222 | Oil & Gas Operator | Jun 2007 |
| 395 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 396 | N. E. Operating Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 397 | Nall Oil & Gas | Mineral Wells, TX 76067 | Oil & Gas Operator | Feb 2026 |
| 398 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 399 | Natural Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 1997 |
| 400 | Navus Operating, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |