| 601 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 602 | Lauck & Associates | Walnut Creek, CA 91789 | Oil & Gas Operator | Dec 2025 |
| 603 | Lawrence James Oil Prop Inc | Catoosa, OK 74015 | Oil & Gas Operator | Feb 2012 |
| 604 | Layton Oil Co | | Oil Operator | Feb 1994 |
| 605 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 606 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Dec 2025 |
| 607 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 608 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 609 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 610 | Lee Of Tulsa Oil & Gas Inc | Tulsa, OK 74114-5634 | Oil & Gas Operator | Dec 2021 |
| 611 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Nov 2025 |
| 612 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 613 | Leonard Vann | | Oil Operator | Oct 2025 |
| 614 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 615 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | Nov 2025 |
| 616 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 617 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 618 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 619 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 620 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 621 | Lincoln 77 Inc | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 622 | Liston V Dean | Nowata, OK 74048-5200 | Oil & Gas Operator | Nov 2016 |
| 623 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 624 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Nov 2025 |
| 625 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2025 |
| 626 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Nov 2025 |
| 627 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 628 | Loman Linda Gann | Norman, OK 73069-6548 | Oil Operator | Apr 2011 |
| 629 | Long, John P | | Oil & Gas Operator | Nov 2025 |
| 630 | Longhorn Estates & Cattle Co. LLC | Jennings, OK 74038 | Oil Operator | Nov 2025 |
| 631 | Longhurst Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 632 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 633 | Loving Company (The) | Broken Arrow, OK 74014-0001 | Oil & Gas Operator | May 2013 |
| 634 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 635 | Luke Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Dec 2025 |
| 636 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | Nov 2025 |
| 637 | Luther Oil Inc | Cameron Park, CA 95682-8865 | Oil & Gas Operator | Apr 2020 |
| 638 | LVM Oil Production LLC | Yale, OK 74085-6688 | Oil & Gas Operator | Jul 2021 |
| 639 | Lynan Energy Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 640 | M & M Petroleum Company | Mannford, OK 74044-0462 | Oil Operator | Apr 2020 |
| 641 | M & T Production Company LLC | Tulsa, OK 74132-3742 | Oil Operator | Apr 2011 |
| 642 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 643 | Macanudo Energy Inc | Sapulpa, OK 74066 | Gas Operator | Jan 2007 |
| 644 | Maggard Joe | Mannford, OK 74044 | Oil & Gas Operator | May 2023 |
| 645 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 646 | Maggard VIrginia J | Mannford, OK 74044-3027 | Oil Operator | Nov 2025 |
| 647 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 648 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 649 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | Oct 2025 |
| 650 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 651 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | Sep 2025 |
| 652 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 653 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 654 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Nov 2025 |
| 655 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 656 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Nov 2025 |
| 657 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 658 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 659 | Martin Billy G | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 660 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 661 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 662 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 663 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | Oct 2025 |
| 664 | Mattea Oil & Gas LLC | Drumright, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 665 | Matthews Florine D | Bristow, OK 74010 | Oil & Gas Operator | Jan 2020 |
| 666 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Feb 2026 |
| 667 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 668 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Oct 2025 |
| 669 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Feb 2026 |
| 670 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 671 | McElroy John | Sapulpa, OK 74066-6119 | Oil & Gas Operator | Nov 2025 |
| 672 | McFerran Operating LLC | Seminole, OK 74868-6202 | Oil & Gas Operator | Dec 2025 |
| 673 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 674 | McGinley P A | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1996 |
| 675 | McGonigal Ted W | Norman, OK 73072 | Oil & Gas Operator | Sep 2025 |
| 676 | McGuire Tom Oil Company | Depew, OK 74028 | Oil Operator | Apr 2011 |
| 677 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 678 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 679 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Nov 2025 |
| 680 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Dec 2025 |
| 681 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 682 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 683 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Dec 2025 |
| 684 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 685 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Dec 2025 |
| 686 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 687 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 688 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 689 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Nov 2025 |
| 690 | Midnight Energy Operating LLC | Drumright, OK 74030 | Oil Operator | Nov 2025 |
| 691 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 692 | Mikal R Brown Oil LLC | Cleveland, OK 74020-6475 | Oil Operator | Dec 2022 |
| 693 | Mikarden Energy Inc | Sapulpa, OK 74066 | Oil Operator | Oct 2025 |
| 694 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |
| 695 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 696 | Miller John Production | Bristow, OK 74010-2455 | Oil & Gas Operator | Jul 2016 |
| 697 | Miller William D | Sapulpa, OK 74066-1061 | Oil Operator | Oct 2010 |
| 698 | Miller-McGee Operating Inc | Stroud, OK 74079 | Oil & Gas Operator | Dec 2025 |
| 699 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 700 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |