| 401 | Las Colinas Oil Corp. | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 402 | Latigo Drilling Corporation | Duncan, OK 73533 | Oil & Gas Operator | May 2026 |
| 403 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Jun 2026 |
| 404 | Laverty, Thomas R | | Oil & Gas Operator | Dec 2023 |
| 405 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Jun 2026 |
| 406 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 407 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 408 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 409 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | May 2026 |
| 410 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2026 |
| 411 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | May 2026 |
| 412 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 413 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 414 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 415 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 416 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 417 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2026 |
| 418 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2026 |
| 419 | Long Royalty Company | Yukon, OK 73085 | Oil & Gas Operator | Jan 2004 |
| 420 | Lou Dennis Oil Company Inc | Ada, OK 74820-2303 | Oil & Gas Operator | Jun 2016 |
| 421 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Jun 2026 |
| 422 | Lucky Ace Petroleum LLC | Carrollton, TX 75010-4232 | Oil Operator | Oct 2021 |
| 423 | Lucky Four Oil & Gas Company | Sasakwa, OK 74867 | Oil & Gas Operator | May 2026 |
| 424 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | May 2026 |
| 425 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 426 | Lyon Hoyle | Sasakwa, OK 74867 | Oil Operator | Jan 2026 |
| 427 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Jun 2026 |
| 428 | Macmart Inc | Wynnewood, OK 73098 | Oil & Gas Operator | Jan 2016 |
| 429 | Magic Investments LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2026 |
| 430 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Apr 2025 |
| 431 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Jun 2026 |
| 432 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Dec 2025 |
| 433 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2026 |
| 434 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jun 2026 |
| 435 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2026 |
| 436 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 437 | Marsh Lonnie C | Konawa, OK 74849 | Oil & Gas Operator | Apr 2026 |
| 438 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2026 |
| 439 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 440 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Mar 2026 |
| 441 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 442 | Massad John M | Holdenville, OK 74848-2629 | Oil & Gas Operator | Oct 2017 |
| 443 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 444 | Matthews Kenneth (Butch) | Konawa, OK 74849-0310 | Oil Operator | Apr 2026 |
| 445 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Apr 2026 |
| 446 | McElroy John | Sapulpa, OK 74066-6119 | Oil & Gas Operator | Apr 2026 |
| 447 | McGhee Exploration And Prod. Co. | Houston, TX 77019 | Oil & Gas Operator | Feb 2003 |
| 448 | McGriff Craig Exploration Inc | Oklahoma City, OK 73172-0364 | Oil & Gas Operator | Mar 2023 |
| 449 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | May 2026 |
| 450 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jun 2026 |
| 451 | Mercer Oil And Gas Co Inc | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 452 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 453 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | May 2026 |
| 454 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | May 2026 |
| 455 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 456 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2026 |
| 457 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 458 | Mikco Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2001 |
| 459 | Miller-McGee Operating Inc | Stroud, OK 74079 | Oil & Gas Operator | Jun 2026 |
| 460 | Milne Lewis Joel | Allen, OK 74825 | Oil & Gas Operator | Mar 2015 |
| 461 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 462 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 463 | Minihan Production Co | Seminole, OK 74868 | Oil & Gas Operator | Jan 1997 |
| 464 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 465 | Miura Petroleum Inc | Topeka, KS 66603 | Oil & Gas Operator | May 2006 |
| 466 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 467 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2026 |
| 468 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | May 2026 |
| 469 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Jun 2026 |
| 470 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | May 2026 |
| 471 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 472 | Moran Oil Enterprises LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 473 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2026 |
| 474 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 475 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |
| 476 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 477 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 478 | MXP Operating LLC | Covington, TX 76093 | Oil & Gas Operator | Feb 2026 |
| 479 | Nail Stephen Dba Nail Oil & Gas | Maud, OK 74854 | Oil Operator | Aug 2025 |
| 480 | Natural Resources Operating LLC | Norman, OK 73071-1295 | Oil & Gas Operator | Jan 2023 |
| 481 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2026 |
| 482 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Jun 2026 |
| 483 | New Lift Inc | Nowata, OK 74048-0245 | Oil & Gas Operator | Mar 2015 |
| 484 | Newell Oil And Gas LLC | Shawnee, OK 74801-5783 | Oil & Gas Operator | May 2026 |
| 485 | Nijean, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Feb 2012 |
| 486 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 487 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 488 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Sep 2026 |
| 489 | Noble Operating Company Inc | Garden City, KS 67846 | Oil & Gas Operator | Sep 2014 |
| 490 | Norman Kenneth W | Sasakwa, OK 74867-0086 | Oil Operator | Oct 2017 |
| 491 | North Canadian Production LLC | Okemah, OK 74859 | Oil & Gas Operator | May 2026 |
| 492 | Northbrook Oil & Gas Co LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2014 |
| 493 | Northbrook Oil & Gas Company | Norman, OK 73070-4916 | Oil & Gas Operator | Jun 2016 |
| 494 | Nossaman E Oil Inc | Del City, OK 73155-5449 | Oil Operator | Oct 2002 |
| 495 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 496 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |
| 497 | O'Neal Oil & Gas Co | Fort Worth, TX 76107-1479 | Oil & Gas Operator | Jun 2026 |
| 498 | Oak Hills Drilling & Oper., LLC | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 499 | Oak Hills Energy Inc | Holdenville, OK 74848-0470 | Oil & Gas Operator | Sep 2014 |
| 500 | Oak Tree Natural Res LLC | Oklahoma City, OK 73120-5065 | Oil & Gas Operator | Mar 2015 |