| 401 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 402 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 403 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 404 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 405 | Midway Leasing Inc | Haskell, OK 74436-2406 | Oil & Gas Operator | Jan 2024 |
| 406 | Midwest Oil Company | Beggs, OK 74421-2976 | Oil Operator | Apr 2015 |
| 407 | Miller John Production | Bristow, OK 74010-2455 | Oil & Gas Operator | Jul 2016 |
| 408 | Miller Oil & Gas Co | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2017 |
| 409 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 410 | Mitchell Cecil D | Haskell, OK 74436-7667 | Oil & Gas Operator | Apr 2020 |
| 411 | Mitchell Martha | Henryetta, OK 74437-0488 | Oil & Gas Operator | Apr 2011 |
| 412 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | May 2025 |
| 413 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 414 | Mode Oil & Gasdev LTD12/21/Ofb 9-98 | | Oil & Gas Operator | May 2013 |
| 415 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | Mar 2025 |
| 416 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 417 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 418 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 419 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 420 | Moore Tommy M | Sapulpa, OK 74066-8273 | Oil & Gas Operator | May 2013 |
| 421 | Morton Bros A Partnership | Bristow, OK 74010-0403 | Oil & Gas Operator | Jul 2003 |
| 422 | Morton Leases | Morris, OK 74445-2048 | Oil & Gas Operator | Jul 2017 |
| 423 | Morton Leases Inc | | Oil & Gas Operator | Feb 2025 |
| 424 | Mott Oil & Gas | Sugarland, TX 77478 | Oil & Gas Operator | May 2001 |
| 425 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 426 | Murphy Helen Colpitt Trust | Collinsville, OK 74021-0128 | Oil & Gas Operator | May 2002 |
| 427 | Natural Gas Resources Inc | Davenport, IA 52809-1675 | Oil & Gas Operator | Oct 2022 |
| 428 | Nelson Billy L Trust | Okmulgee, OK 74447-2047 | Oil & Gas Operator | Feb 2015 |
| 429 | Neodyne Drilling Corporation | Tulsa, OK 74153-0326 | Oil & Gas Operator | Apr 2020 |
| 430 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Feb 2025 |
| 431 | New Energy Corporation | Rancho Santa Fe, CA 92067-1990 | Oil & Gas Operator | Jul 2024 |
| 432 | New Era Gas Co Inc | Bull Shoals, AR 72619-0130 | Gas Operator | Mar 2004 |
| 433 | Nickle Audrey O | Okmulgee, OK 74447-2823 | Oil & Gas Operator | Apr 2020 |
| 434 | Nixon Properties Inc | Tulsa, OK 74104 | Oil & Gas Operator | Aug 2023 |
| 435 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 436 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2025 |
| 437 | NS Oil LLC | Minneapolis, MN 55410 | Oil Operator | Feb 2025 |
| 438 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |
| 439 | O'Blue Corp. | Kerrville, TX 78028 | Oil & Gas Operator | Mar 1998 |
| 440 | O'Hern Morris D | Mounds, OK 74047-5163 | Oil & Gas Operator | Sep 2016 |
| 441 | O'Neal Oil & Gas Co | Fort Worth, TX 76107-1479 | Oil & Gas Operator | Mar 2025 |
| 442 | Octagon Resources LLC | Norman, OK 73071-1295 | Oil & Gas Operator | May 2015 |
| 443 | Odell Larry | Oologah, OK 74053 | Oil Operator | Apr 2011 |
| 444 | Oil & Gas Unlimited Inc | | Oil & Gas Operator | May 2013 |
| 445 | Oil Property Management, Inc. | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 446 | Oil Recovery Systems Inc | Tulsa, OK 74145-4619 | Oil & Gas Operator | Feb 2025 |
| 447 | Oklahoma Liquid Resources Inc | Collinsville, OK 74021 | Oil & Gas Operator | Feb 2025 |
| 448 | Oklahoma O & G Royalties Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2000 |
| 449 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Feb 2025 |
| 450 | Oklahoma Oil And Gas Resources LLC | Guthrie, OK 73044-8095 | Oil & Gas Operator | Feb 2025 |
| 451 | Oklahoma Prod & Exp Co | Broken Arrow, OK 74012 | Oil & Gas Operator | May 2013 |
| 452 | Oklaoleum Oil And Gas Inc | Bristow, OK 74010-0057 | Oil Operator | Jan 2016 |
| 453 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 454 | Okt Petroleum Company Inc | Oklahoma City, OK 73118-7425 | Oil & Gas Operator | Oct 2013 |
| 455 | Olympia Oil Inc | Edmond, OK 73083-7088 | Oil & Gas Operator | Jul 2020 |
| 456 | Omega Energy, LLC | Corpus Chrsti, TX 78418 | Oil & Gas Operator | May 2025 |
| 457 | Omimex International Corp | Fort Worth, TX 76103-2300 | Oil & Gas Operator | Feb 2025 |
| 458 | Onapa Gas Company LLC | Tulsa, OK 74136-7253 | Gas Operator | Nov 2019 |
| 459 | Oneok Gas Transportation Co | Tulsa, OK 74121-2089 | Oil & Gas Operator | Oct 2014 |
| 460 | Open Door Holdings Inc | Surprise, AZ 85387-2015 | Oil & Gas Operator | Feb 2024 |
| 461 | Open Door Productions Inc | Muskogee, OK 74401-1032 | Oil & Gas Operator | Apr 2020 |
| 462 | Oso Resources LLC | Oklahoma City, OK 73118-5022 | Oil & Gas Operator | Feb 2025 |
| 463 | Overland Investments Inc | Coweta, OK 74429 | Oil & Gas Operator | Feb 2025 |
| 464 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Mar 2025 |
| 465 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Mar 2025 |
| 466 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 467 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 468 | Pal Kids Inc | Coronado, CA 92118 | Oil & Gas Operator | Nov 2000 |
| 469 | Pan Texas Petroleum Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2003 |
| 470 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 471 | Parham Edith | Beggs, OK 74421-2436 | Oil Operator | Oct 2024 |
| 472 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 473 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 474 | Patterson Bobby Ray | Haskell, OK 74436-8809 | Oil & Gas Operator | Apr 2020 |
| 475 | Patton Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2007 |
| 476 | Paul Gillham Oil Company | Maud, OK 74854 | Oil & Gas Operator | Feb 2025 |
| 477 | Pedocs Inc | Bixby, OK 74008 | Oil & Gas Operator | Feb 2025 |
| 478 | Penequine Ranch | | Gas Operator | Sep 2019 |
| 479 | Penn Production Company Inc | | Oil & Gas Operator | Nov 2014 |
| 480 | Perry Production Company Inc | Perry, OK 73077-0412 | Oil & Gas Operator | May 2006 |
| 481 | Petco Petroleum Corp | Hinsdale, IL 60521 | Oil & Gas Operator | Feb 2025 |
| 482 | Petro-Chase Energy Corp | Oklahoma City, OK 73135-6205 | Oil & Gas Operator | Jan 2007 |
| 483 | Petro-X Corporation | Houston, TX 77092 | Oil & Gas Operator | Jul 2002 |
| 484 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 485 | Petroleum International, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2000 |
| 486 | Petroleum Properties Co Inc | Tulsa, OK 74132-4010 | Oil & Gas Operator | Sep 2012 |
| 487 | Petromark Resources Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 488 | Petron Oil Company | Missouri City, TX 77489 | Oil & Gas Operator | May 2025 |
| 489 | Pettit Charles Oil Company | Okmulgee, OK 74447-4226 | Oil & Gas Operator | Sep 2018 |
| 490 | Pheldon Oil Production Inc | Asher, OK 74826-2629 | Oil & Gas Operator | Dec 2024 |
| 491 | Philco Energy Inc | Lamesa, TX 79331 | Oil & Gas Operator | Mar 2015 |
| 492 | Pilot Exploration Company | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2011 |
| 493 | Pinkston Robert L | Beggs, OK 74421 | Oil Operator | Jan 2025 |
| 494 | Pinnacle Corporation (The) | Broken Arrow, OK 74012 | Oil & Gas Operator | Nov 2014 |
| 495 | Pinnacle Exploration & Production Co | Kiefer, OK 74041 | Oil & Gas Operator | Feb 2025 |
| 496 | Pletcher Oil Limited Liability Company | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2025 |
| 497 | Polaris Energy Dev Co | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2000 |
| 498 | Pollard Jr G W | Okmulgee, OK 74447 | Oil & Gas Operator | Apr 2015 |
| 499 | Pope Charles Edward | Morris, OK 74445 | Oil & Gas Operator | Mar 2023 |
| 500 | Pope Oil LLC | Morris, OK 74445 | Oil Operator | Feb 2025 |