| 401 | Kemp Roy L | | Oil Operator | Jan 2011 |
| 402 | Kennedy, Howard E | | Oil & Gas Operator | May 1997 |
| 403 | Kennedy, Tracy J | | Oil Operator | May 2026 |
| 404 | Keystone Oil And Gas Company LLC | Collinsville, OK 74021 | Oil & Gas Operator | Jun 2026 |
| 405 | Kiamichi Resources Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | Feb 2016 |
| 406 | Kile Production | Cypress, TX 77410 | Oil & Gas Operator | Aug 2014 |
| 407 | KJB Oil Company LLC | Dewey, OK 74029-3053 | Oil Operator | May 2026 |
| 408 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 409 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Jun 2026 |
| 410 | Koch Hydrocarbon Company | Wichita, KS 67220-3203 | Oil & Gas Operator | Nov 2014 |
| 411 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 412 | Kornblit, Majir | | Oil Operator | Nov 1998 |
| 413 | Krebbs, David B | | Oil & Gas Operator | May 2026 |
| 414 | Krotzer Oil Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2026 |
| 415 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Jun 2026 |
| 416 | KSW Operating,LLC | | Oil & Gas Operator | Mar 2015 |
| 417 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 418 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |
| 419 | L & L Producers | Independence, KS 67301 | Oil Operator | May 2026 |
| 420 | L B G Operating Co | Fairfax, OK 74037 | Oil & Gas Operator | Oct 2014 |
| 421 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | May 2026 |
| 422 | Laml Compaines LLC | Cleveland, OK 74020 | Oil Operator | May 2026 |
| 423 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Jun 2026 |
| 424 | Latigo Oil & Gas, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Jun 2026 |
| 425 | Laverty, Thomas R | | Oil & Gas Operator | Dec 2023 |
| 426 | Lawco Exploration Inc | Bentonville, AR 72712 | Oil & Gas Operator | Aug 2024 |
| 427 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Apr 2026 |
| 428 | Lawrence Roy Drilling Co Inc | Pawnee, OK 74058-0306 | Oil & Gas Operator | Aug 2000 |
| 429 | Lawson George E | Sand Springs, OK 74063 | Oil & Gas Operator | May 2013 |
| 430 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 431 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | May 2026 |
| 432 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2026 |
| 433 | Lester Joan | Sand Springs, OK 74063 | Oil & Gas Operator | May 2026 |
| 434 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | May 2026 |
| 435 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | May 2026 |
| 436 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | May 2026 |
| 437 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 438 | Lightner Harry A | | Oil & Gas Operator | May 2013 |
| 439 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 440 | Lincoln Ventures LLC | Inola, OK 74036-5035 | Oil & Gas Operator | May 2026 |
| 441 | Link Oil Company (The) | Tulsa, OK 74103-4113 | Oil & Gas Operator | Jan 2014 |
| 442 | Little Bear Oil & Gas Co LTD | Boca Rotan, FL 33431 | Oil & Gas Operator | Jan 1997 |
| 443 | Little Chief Energy Corporation | Independence, KS 67301 | Oil Operator | May 2026 |
| 444 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2026 |
| 445 | Locke Stock & Barrel Res Inc | Calgary, AB T2P3G | Oil Operator | Nov 1998 |
| 446 | Long, John P | | Oil & Gas Operator | May 2026 |
| 447 | Lynan Energy Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 448 | Lynn William R | Pawhuska, OK 74056 | Oil & Gas Operator | May 2013 |
| 449 | M & H Enterprises | Bartlesville, OK 74006-5504 | Oil & Gas Operator | Jan 2013 |
| 450 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Jun 2026 |
| 451 | M-S-C Corporation | Houston, TX 77027 | Oil Operator | May 1994 |
| 452 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 453 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 454 | Magnolia Petroleum Inc | Tulsa, OK 74106-2433 | Oil Operator | Jun 2018 |
| 455 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 456 | Mahan, Janet L | | Oil & Gas Operator | May 2026 |
| 457 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 458 | Majors, Linda K | | Oil Operator | Apr 2026 |
| 459 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Feb 2026 |
| 460 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2026 |
| 461 | Marco Oil Company | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 462 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | May 2026 |
| 463 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 464 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2026 |
| 465 | Marlin, Bruce W | | Oil Operator | May 2026 |
| 466 | Marmac Resources Company | | Oil & Gas Operator | Mar 2015 |
| 467 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 468 | Martin John R | Cushing, OK 74023 | Oil & Gas Operator | Apr 1995 |
| 469 | Martin Jr, James U | | Oil & Gas Operator | May 2026 |
| 470 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Oct 2025 |
| 471 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2026 |
| 472 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2026 |
| 473 | McCabe Oil And Gas LLC / Osage Only | | Oil Operator | May 2026 |
| 474 | McCabe, William G | | Oil & Gas Operator | Aug 2013 |
| 475 | McCann Resources Inc | | Oil & Gas Operator | May 2026 |
| 476 | McClintock, Robert T | | Oil & Gas Operator | Apr 2026 |
| 477 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 478 | McKee Energy Comapny Inc | | Oil & Gas Operator | Apr 2011 |
| 479 | McMurtrie Oil Inc | | Oil & Gas Operator | Apr 2026 |
| 480 | Meadowlark Operating Co | | Oil & Gas Operator | May 2026 |
| 481 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 482 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 483 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 484 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 485 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 486 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Apr 2026 |
| 487 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 488 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2026 |
| 489 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 490 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 491 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 492 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 493 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 494 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 495 | Miller, James R | Herrington, KS 67449 | Oil Operator | May 2026 |
| 496 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 497 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 498 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 499 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Jun 2026 |
| 500 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |