| 1 | M & H Enterprises | Bartlesville, OK 74006-5504 | Oil & Gas Operator | Jan 2013 |
| 2 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Sep 2025 |
| 3 | M-S-C Corporation | Houston, TX 77027 | Oil Operator | May 1994 |
| 4 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 5 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 6 | Magnolia Petroleum Inc | Tulsa, OK 74106-2433 | Oil Operator | Jun 2018 |
| 7 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 8 | Mahan, Janet L | | Oil & Gas Operator | Aug 2025 |
| 9 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 10 | Majors, Linda K | | Oil Operator | Aug 2025 |
| 11 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Jul 2025 |
| 12 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 13 | Marco Oil Company | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 14 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2025 |
| 15 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 16 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Aug 2025 |
| 17 | Marlin, Bruce W | | Oil Operator | Aug 2025 |
| 18 | Marmac Resources Company | | Oil & Gas Operator | Mar 2015 |
| 19 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 20 | Martin John R | Cushing, OK 74023 | Oil & Gas Operator | Apr 1995 |
| 21 | Martin Jr, James U | | Oil & Gas Operator | Aug 2025 |
| 22 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Jul 2025 |
| 23 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Dec 2025 |
| 24 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 25 | McCabe Oil And Gas LLC / Osage Only | | Oil Operator | Aug 2025 |
| 26 | McCabe, William G | | Oil & Gas Operator | Aug 2013 |
| 27 | McCann Resources Inc | | Oil & Gas Operator | Aug 2025 |
| 28 | McClintock, Robert T | | Oil & Gas Operator | Jul 2025 |
| 29 | McGonigal Dan L | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2024 |
| 30 | McKee Energy Comapny Inc | | Oil & Gas Operator | Apr 2011 |
| 31 | McMurtrie Oil Inc | | Oil & Gas Operator | Jun 2025 |
| 32 | Meadowlark Operating Co | | Oil & Gas Operator | Aug 2025 |
| 33 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 34 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 35 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 36 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 37 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 38 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Aug 2025 |
| 39 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 40 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 41 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2025 |
| 42 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 43 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 44 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 45 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 46 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 47 | Miller, James R | Herrington, KS 67449 | Oil Operator | Aug 2025 |
| 48 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 49 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 50 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 51 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Sep 2025 |
| 52 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 53 | Moran Pipe & Supply Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Jan 2019 |
| 54 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Sep 2025 |
| 55 | Moze Inc | Ochelata, OK 74051 | Oil & Gas Operator | Jan 2001 |
| 56 | Mullins, John S | | Oil Operator | Nov 2014 |
| 57 | Murphy Jack L | Tulsa, OK 74104-4915 | Oil Operator | Mar 2015 |
| 58 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 59 | Myers, Robert L | | Oil Operator | Aug 2025 |