| 501 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Nov 2023 |
| 502 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 503 | Marco Oil Co, Inc | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 504 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2024 |
| 505 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 506 | Marlin Oil & Gas | Pawhuska, OK 74056 | Oil Operator | Jan 2024 |
| 507 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2024 |
| 508 | Marmac Resources Co. | Los Angeles, CA 90027 | Oil & Gas Operator | Mar 2015 |
| 509 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 510 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Jan 2024 |
| 511 | Martin John R | Cushing, OK 74023 | Oil & Gas Operator | Apr 1995 |
| 512 | Mauldin Robert | Barnsdall, OK 74002 | Oil Operator | Jan 2024 |
| 513 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Jan 2024 |
| 514 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | May 2024 |
| 515 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | May 2024 |
| 516 | McCabe Douglas | Pawhuska, OK 74056 | Oil Operator | Feb 2012 |
| 517 | McCabe Oil & Gas LLC | | Oil Operator | Jan 2024 |
| 518 | McCabe, William G | | Oil & Gas Operator | Aug 2013 |
| 519 | McCann Resources Inc | Sedan, KS 67361 | Oil & Gas Operator | Jan 2024 |
| 520 | McClintock, Robert T | | Oil & Gas Operator | Nov 2023 |
| 521 | McGonigal Dan L | | Oil & Gas Operator | Oct 2023 |
| 522 | McKee Energy Company Inc | Pawhuska, OK 74056 | Oil & Gas Operator | Apr 2011 |
| 523 | McMurtrie Bill Jr | Bartlesville, OK 74003 | Oil & Gas Operator | Aug 2023 |
| 524 | Meadowlark Operator Co | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2024 |
| 525 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 526 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 527 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 528 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 529 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 530 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Dec 2023 |
| 531 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 532 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 533 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2024 |
| 534 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 535 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 536 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 537 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 538 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 539 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 540 | Miller, James R. | Herrington, KS 67449 | Oil Operator | Jan 2024 |
| 541 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 542 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 543 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 544 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Feb 2024 |
| 545 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 546 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 547 | Moran-K Oil LLC | Seminole, OK 74818-1295 | Oil & Gas Operator | Feb 2024 |
| 548 | Moze Inc | Ochelata, OK 74051 | Oil & Gas Operator | Jan 2001 |
| 549 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 550 | Mullins John S | Hominy, OK 74035 | Oil Operator | Nov 2014 |
| 551 | Murphy Jack L | Tulsa, OK 74104-4915 | Oil Operator | Mar 2015 |
| 552 | Murphy S J Oil & Gas Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2024 |
| 553 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 554 | Myers Robert L Dba RLM Oil Co | | Oil Operator | Jan 2024 |
| 555 | N B C Bank | Tulsa, OK 74135 | Oil Operator | Mar 1996 |
| 556 | N V O & G Investments LLC | | Oil Operator | Sep 2022 |
| 557 | Nadel And Gussman, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | May 2024 |
| 558 | Natural Gas Compression Corp | Cleveland, OK 74020-0065 | Oil & Gas Operator | Nov 2023 |
| 559 | Natural Gas Resources Inc | Davenport, IA 52809-1675 | Oil & Gas Operator | Oct 2022 |
| 560 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | May 2024 |
| 561 | Nelson Exploration Corporation | | Oil & Gas Operator | Jan 2024 |
| 562 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Feb 2024 |
| 563 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 564 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2024 |
| 565 | Noble Resources Inc | Mannford, OK 74044-0570 | Oil & Gas Operator | Feb 2024 |
| 566 | Northam Oil Company Inc | Ada, OK 74820-3334 | Oil & Gas Operator | Jan 2024 |
| 567 | Northcote Cleveland | | Oil & Gas Operator | Jan 2024 |
| 568 | Northeast Shelf LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2017 |
| 569 | Northwind Development Company | | Oil Operator | Oct 1995 |
| 570 | NTR Energy LLC | Caney, KS 67333 | Oil & Gas Operator | Apr 2020 |
| 571 | O'Donnell Bill C | Tulsa, OK 74135-4241 | Oil & Gas Operator | Oct 2014 |
| 572 | O'Neal Oil & Gas Co | Fort Worth, TX 76107-1479 | Oil & Gas Operator | Feb 2024 |
| 573 | O'Neal Oil Company | Nocona, TX 76255 | Oil & Gas Operator | May 2024 |
| 574 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 575 | Octagon Resources LLC | Norman, OK 73071-1295 | Oil & Gas Operator | May 2015 |
| 576 | Oil Lift, Incorporated | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 577 | Oil Operations Inc | | Oil & Gas Operator | Apr 2011 |
| 578 | Oil Patch Energy LLC | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2024 |
| 579 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | May 2024 |
| 580 | Oilfield Operating Company | Cushing, OK 74023-1347 | Oil & Gas Operator | Jan 2018 |
| 581 | Okc Energy Corporation | Oklahoma City, OK 73120-3119 | Oil & Gas Operator | Nov 2014 |
| 582 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 583 | Oklahoma & Northwestern Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1997 |
| 584 | Oklahoma Cellulose Inc | Cleveland, OK 74020-0193 | Oil Operator | Jan 2024 |
| 585 | Oklahoma Crude Reclaimers, LLC | | Oil Operator | Feb 2024 |
| 586 | Oklahoma Energy LLC | Skiatook, OK 74070-3998 | Oil Operator | Aug 2023 |
| 587 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 588 | Oklahoma Oil & Gas MGMT Inc | | Oil & Gas Operator | Jan 2024 |
| 589 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 590 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 591 | Ole Crow Operating | Wichita Falls, TX 76308-0072 | Oil Operator | Feb 2024 |
| 592 | Oliphant Operating LTD LLC | Tulsa, OK 74159-4529 | Oil Operator | Jan 2024 |
| 593 | Oneok Gas Transportation Co | Tulsa, OK 74121-2089 | Oil & Gas Operator | Oct 2014 |
| 594 | Orion Exploration LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Apr 2015 |
| 595 | Orion Exploration Partners LLC | | Oil & Gas Operator | Jul 2020 |
| 596 | Osage Energy LLC | Colony, KS 66015 | Oil Operator | Nov 2023 |
| 597 | Osage Energy Resources LLC | Bartlesville, OK 74005-2527 | Oil & Gas Operator | Jan 2024 |
| 598 | Osage Operating | Virginia Beach, VA 23452 | Oil & Gas Operator | Oct 2003 |
| 599 | Otc Investors Inc | Locust Grove, OK 74352 | Oil Operator | Dec 2023 |
| 600 | Otc/Occ Not Assigned | | Oil & Gas Operator | Nov 2023 |