| 601 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 602 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 603 | Liston V Dean | Nowata, OK 74048-5200 | Oil & Gas Operator | Nov 2016 |
| 604 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 605 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | May 2025 |
| 606 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 607 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | May 2025 |
| 608 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 609 | Loman Linda Gann | Norman, OK 73069-6548 | Oil Operator | Apr 2011 |
| 610 | Long, John P | | Oil & Gas Operator | May 2025 |
| 611 | Longhorn Estates & Cattle Co. LLC | Jennings, OK 74038 | Oil Operator | May 2025 |
| 612 | Longhurst Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 613 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 614 | Loving Company (The) | Broken Arrow, OK 74014-0001 | Oil & Gas Operator | May 2013 |
| 615 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 616 | Luke Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 617 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | May 2025 |
| 618 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 619 | LVM Oil Production LLC | Yale, OK 74085-6688 | Oil & Gas Operator | Jul 2021 |
| 620 | Lynan Energy Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 621 | M & M Petroleum Company | Mannford, OK 74044-0462 | Oil Operator | Apr 2020 |
| 622 | M & T Production Company LLC | Tulsa, OK 74132-3742 | Oil Operator | Apr 2011 |
| 623 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 624 | Maggard Joe | Mannford, OK 74044 | Oil & Gas Operator | May 2023 |
| 625 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 626 | Maggard VIrginia J | Mannford, OK 74044-3027 | Oil Operator | May 2025 |
| 627 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 628 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 629 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | May 2025 |
| 630 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 631 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | May 2025 |
| 632 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 633 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 634 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | May 2025 |
| 635 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 636 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | May 2025 |
| 637 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 638 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 639 | Martin Billy G | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 640 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 641 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 642 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 643 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | May 2025 |
| 644 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 645 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 646 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Sep 2025 |
| 647 | Maxwell Resources Corporation | Oklahoma City, OK 73116-7746 | Oil & Gas Operator | Apr 2009 |
| 648 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Apr 2025 |
| 649 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2025 |
| 650 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 651 | McElroy John | Sapulpa, OK 74066-6119 | Oil & Gas Operator | May 2025 |
| 652 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Jun 2025 |
| 653 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 654 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 655 | McGonigal Ted W | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 656 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 657 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 658 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 659 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | May 2025 |
| 660 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jun 2025 |
| 661 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 662 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 663 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Jun 2025 |
| 664 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 665 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 666 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 667 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 668 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 669 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Jun 2025 |
| 670 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 671 | Mikal R Brown Oil LLC | Cleveland, OK 74020-6475 | Oil Operator | Dec 2022 |
| 672 | Mikarden Energy Inc | Sapulpa, OK 74066 | Oil Operator | Apr 2025 |
| 673 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |
| 674 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 675 | Miller John Production | Bristow, OK 74010-2455 | Oil & Gas Operator | Jul 2016 |
| 676 | Miller William D | Sapulpa, OK 74066-1061 | Oil Operator | Oct 2010 |
| 677 | Miller-McGee Operating Inc | Stroud, OK 74079 | Oil & Gas Operator | Jun 2025 |
| 678 | Miner Rick | Drumright, OK 74030-0373 | Oil & Gas Operator | May 2025 |
| 679 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 680 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 681 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Sep 2025 |
| 682 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 683 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 684 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 685 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 686 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 687 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 688 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 689 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 690 | Morton Bros A Partnership | Bristow, OK 74010-0403 | Oil & Gas Operator | Jul 2003 |
| 691 | Morton Brothers Company | Bristow, OK 74010 | Oil & Gas Operator | May 2009 |
| 692 | Morton Drilling Company | Bristow, OK 74010-1279 | Oil & Gas Operator | Jun 1995 |
| 693 | Morton Leases | Morris, OK 74445-2048 | Oil & Gas Operator | Jul 2017 |
| 694 | Morton Production Inc | Ada, OK 74820-2643 | Oil & Gas Operator | Sep 2014 |
| 695 | Mountain Creek Energy Inc | Georgetown, TX 78633 | Oil & Gas Operator | Apr 2025 |
| 696 | Mozark Corporation | Spring, TX 77379-8049 | Oil & Gas Operator | Jan 2011 |
| 697 | MRD Nowata LLC | Woodstock, GA 30189 | Oil Operator | Aug 2017 |
| 698 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Jun 2025 |
| 699 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 700 | National Cooperative RFG Assoc | McPherson, KS 67460-1404 | Oil & Gas Operator | Jun 2006 |