| 301 | Jones & Whittington Oil Co. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2004 |
| 302 | Jones, Charles E., Jr. | Odessa, TX 79760 | Oil & Gas Operator | Jul 2013 |
| 303 | Jrow Energy LLC | Lubbock, TX 79423 | Oil Operator | Mar 2025 |
| 304 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 305 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 306 | K & W Vanpelt Company | Portage, OH 43451 | Oil & Gas Operator | Mar 2025 |
| 307 | Kahlenberg Oil And Gas LLC | Conroe, TX 77304 | Oil Operator | Mar 2025 |
| 308 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 309 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 310 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 311 | Klabzuba Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2013 |
| 312 | Koko Skadi, LLC | Austin, TX 78731 | Oil & Gas Operator | Mar 2025 |
| 313 | Korman Exploration, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2001 |
| 314 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 315 | La Aceite Energy, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 316 | Ladd Oil & Gas Corporation | Midland, TX 79711 | Oil & Gas Operator | Dec 2021 |
| 317 | Ladd Operating Company | Midland, TX 79711 | Oil & Gas Operator | Mar 2008 |
| 318 | Laguna Petroleum Corporation | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 319 | Lakeshore Operating, LLC | Wichita, KS 67203 | Oil & Gas Operator | Mar 2025 |
| 320 | Lakewood Operating, LTD. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 321 | Landmaster Partners, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 322 | Lapco Oil & Gas Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2015 |
| 323 | Lariat Land & Exploration, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 324 | Lavanco Energy, LTD. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2024 |
| 325 | Lawrence Energy Company | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 326 | Leclair Operating Co., Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 327 | Leclair Operating, L.L.C. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 328 | Lillis, Michael D. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 329 | Lime Creek Enterprises | Aztec, NM 87410 | Oil & Gas Operator | Aug 2008 |
| 330 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 331 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 332 | Lone Star Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1999 |
| 333 | Lone Star Production | Lawn, TX 79530 | Oil & Gas Operator | Mar 2025 |
| 334 | LP Operating, LLC | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 335 | Lucros International Corporation | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2025 |
| 336 | Lumbley, W. F. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2008 |
| 337 | Lynx Oil Co., Inc. | Denton, TX 76207 | Oil & Gas Operator | Sep 2003 |
| 338 | Lyon Operating Company Inc.(Iii) | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 339 | Lytle Creek Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Mar 2025 |
| 340 | M-G Gas Company, Inc. | Plano, TX 75086 | Oil & Gas Operator | Jun 1999 |
| 341 | Magnet Oil LP | Bronte, TX 76933 | Oil & Gas Operator | Mar 2025 |
| 342 | Mak-J Energy Partners(TX),LTD. | Denver, CO 80206 | Oil & Gas Operator | Sep 2013 |
| 343 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 344 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 345 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 346 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 347 | Masa Energy LLC | Houston, TX 77094 | Oil & Gas Operator | Mar 2025 |
| 348 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2025 |
| 349 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 350 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 351 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2025 |
| 352 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Mar 2025 |
| 353 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 354 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 355 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 356 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 357 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Mar 2025 |
| 358 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 359 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 360 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 361 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 362 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 363 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 364 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Mar 2025 |
| 365 | Minuteman Energy, LLC | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2015 |
| 366 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 367 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 368 | MM China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Mar 2025 |
| 369 | MMG Oil Company | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2006 |
| 370 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 371 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 372 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 373 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 374 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 375 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 376 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 377 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 378 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 379 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 380 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 381 | Nautilus Exploration, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 2021 |
| 382 | Neeb, H. L. | Abilene, TX 79606 | Oil & Gas Operator | Jul 1994 |
| 383 | New Atlantis II, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 384 | New Horizon Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2006 |
| 385 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 386 | North American Exploration Co. | Abilene, TX 79602 | Oil & Gas Operator | Apr 1998 |
| 387 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 388 | Novo Exploration Corporation | Hurst, TX 76053 | Oil & Gas Operator | Jun 2020 |
| 389 | O'Tool Oil & Gas, LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2025 |
| 390 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 391 | Ogden Resources Corporation | Bryan, TX 77802 | Oil & Gas Operator | Mar 2025 |
| 392 | Ogden Resources, LTD. | Bryan, TX 77802 | Oil & Gas Operator | Feb 2009 |
| 393 | Ohlhausen Oil Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 394 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 395 | Oil Management Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2022 |
| 396 | Oil, Gas, Etc. LLC | Katy, TX 77449 | Oil & Gas Operator | Mar 2025 |
| 397 | Ojb, Inc. | Buda, TX 78610 | Oil & Gas Operator | Mar 2013 |
| 398 | Oklahoma Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2013 |
| 399 | Omni Petroleum Corporation | Austin, TX 78738 | Oil & Gas Operator | Mar 2025 |
| 400 | Orth Oil Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |