| 401 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |
| 402 | Laird Bill Oil Company | St Louis, OK 74866 | Oil & Gas Operator | Jun 2025 |
| 403 | Lambert Company LLC | Healdton, OK 73438-0962 | Oil & Gas Operator | Jun 2025 |
| 404 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Jul 2025 |
| 405 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 406 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 407 | Landers Oil & Gas Inc | Tulsa, OK 74132-2171 | Oil & Gas Operator | Jun 2025 |
| 408 | Lansden Operating Co LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 1997 |
| 409 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 410 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Sep 2025 |
| 411 | Larkin Energy Company Inc | Sasakwa, OK 74867 | Oil & Gas Operator | May 2022 |
| 412 | Latigo Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 413 | Laurco Energies,Inc | | Oil & Gas Operator | May 2025 |
| 414 | Laurel Operating Company, Inc. | Stillwater, OK 74074-3025 | Oil & Gas Operator | Jun 2025 |
| 415 | Lee Energy Exploration LTD | Oklahoma City, OK 73102-7114 | Oil & Gas Operator | Jul 2008 |
| 416 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 417 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 418 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 419 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 420 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 421 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 422 | Logan Productions LLC | Wewoka, OK 74884 | Oil Operator | May 2025 |
| 423 | Long Royalty Company | Yukon, OK 73085 | Oil & Gas Operator | Jan 2004 |
| 424 | Longberry Energy Inc | Keota, OK 74941 | Gas Operator | Jun 2025 |
| 425 | Lou Dennis Oil Company Inc | Ada, OK 74820-2303 | Oil & Gas Operator | Jun 2016 |
| 426 | Lowry Exploration Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 427 | Lubell Oil Company | Tulsa, OK 74103 | Gas Operator | Jul 1993 |
| 428 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 429 | Lucky Four Oil & Gas Company | Sasakwa, OK 74867 | Oil & Gas Operator | Jun 2025 |
| 430 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | Jul 2025 |
| 431 | Lyda Gerald SR X Bar Ranch | San Antonio, TX 78268-0907 | Oil & Gas Operator | Feb 1994 |
| 432 | Lynan Energy Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 433 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 434 | M. M. & M. Resources, Inc. | Wetumka, OK 74883 | Oil & Gas Operator | Apr 2020 |
| 435 | M3V Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | Sep 2025 |
| 436 | Macmart Inc | Wynnewood, OK 73098 | Oil & Gas Operator | Jan 2016 |
| 437 | Magic Investments LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 438 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Jun 2025 |
| 439 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Apr 2025 |
| 440 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Jun 2025 |
| 441 | Majors Michael | Holdenville, OK 74848-0531 | Oil & Gas Operator | Sep 1994 |
| 442 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jul 2025 |
| 443 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Jun 2025 |
| 444 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 445 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jun 2025 |
| 446 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jun 2025 |
| 447 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 448 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 449 | Massad John M | Holdenville, OK 74848-2629 | Oil & Gas Operator | Oct 2017 |
| 450 | Massad Oil Company | Holdenville, OK 74848-2629 | Oil Operator | Jun 2025 |
| 451 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 452 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 453 | McCleese Enterprises LLC | Richardson, TX 75082-4839 | Gas Operator | Dec 2017 |
| 454 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Jun 2025 |
| 455 | McCraw Family Limited Partnership (The) | Konawa, OK 74849-5616 | Oil & Gas Operator | Jul 2024 |
| 456 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 457 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 458 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jul 2025 |
| 459 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 460 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 461 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 462 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 463 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2025 |
| 464 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Jun 2025 |
| 465 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 466 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 467 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | May 2025 |
| 468 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 469 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Jun 2025 |
| 470 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 471 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 472 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 473 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 474 | Milne Lewis Joel | Allen, OK 74825 | Oil & Gas Operator | Mar 2015 |
| 475 | Mitchell Cecil D | Haskell, OK 74436-7667 | Oil & Gas Operator | Apr 2020 |
| 476 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 477 | Mitchell Martha | Henryetta, OK 74437-0488 | Oil & Gas Operator | Apr 2011 |
| 478 | Miti-Mini Inc | Wetumka, OK 74883-6172 | Gas Operator | Jul 2016 |
| 479 | Mode Oil & Gasdev LTD12/21/Ofb 9-98 | | Oil & Gas Operator | May 2013 |
| 480 | Moms Oil & Gas LLC | Nowata, OK 74048 | Oil & Gas Operator | Mar 2023 |
| 481 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | Jun 2025 |
| 482 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Jun 2025 |
| 483 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Jun 2025 |
| 484 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 485 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Jun 2025 |
| 486 | Moore Norman L | Sasakwa, OK 74867 | Oil Operator | Jun 2025 |
| 487 | Moran Oil Enterprises, LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 488 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 489 | Morgan Robert M / L Ladean | Wewoka, OK 74884 | Oil & Gas Operator | Jul 2015 |
| 490 | Morris & Associates | Purcell, OK 73080 | Oil Operator | Feb 2012 |
| 491 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |
| 492 | Murexco Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 493 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 494 | Nadel And Gussman, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2025 |
| 495 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 496 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 497 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2025 |
| 498 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Jun 2025 |
| 499 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 500 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Jun 2025 |