| 1 | M & H Enterprises | Bartlesville, OK 74006-5504 | Oil & Gas Operator | Jan 2013 |
| 2 | M E Klein & Associates LLC | Washington, OK 73070-8106 | Oil & Gas Operator | Feb 2024 |
| 3 | M-S-C Corporation | Houston, TX 77027 | Oil Operator | May 1994 |
| 4 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 5 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 6 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 7 | Magnolia Petroleum Inc | | Oil Operator | Jun 2018 |
| 8 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 9 | Mahan Jim And Janet | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2024 |
| 10 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 11 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Nov 2023 |
| 12 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 13 | Marco Oil Co, Inc | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 14 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2024 |
| 15 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 16 | Marlin Oil & Gas | Pawhuska, OK 74056 | Oil Operator | Jan 2024 |
| 17 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2024 |
| 18 | Marmac Resources Co. | Los Angeles, CA 90027 | Oil & Gas Operator | Mar 2015 |
| 19 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 20 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Jan 2024 |
| 21 | Martin John R | Cushing, OK 74023 | Oil & Gas Operator | Apr 1995 |
| 22 | Mauldin Robert | Barnsdall, OK 74002 | Oil Operator | Jan 2024 |
| 23 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Jan 2024 |
| 24 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | May 2024 |
| 25 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | May 2024 |
| 26 | McCabe Douglas | Pawhuska, OK 74056 | Oil Operator | Feb 2012 |
| 27 | McCabe Oil & Gas LLC | | Oil Operator | Jan 2024 |
| 28 | McCabe, William G | | Oil & Gas Operator | Aug 2013 |
| 29 | McCann Resources Inc | Sedan, KS 67361 | Oil & Gas Operator | Jan 2024 |
| 30 | McClintock, Robert T | | Oil & Gas Operator | Nov 2023 |
| 31 | McGonigal Dan L | | Oil & Gas Operator | Oct 2023 |
| 32 | McKee Energy Company Inc | Pawhuska, OK 74056 | Oil & Gas Operator | Apr 2011 |
| 33 | McMurtrie Bill Jr | Bartlesville, OK 74003 | Oil & Gas Operator | Aug 2023 |
| 34 | Meadowlark Operator Co | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2024 |
| 35 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 36 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 37 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 38 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 39 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 40 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Dec 2023 |
| 41 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 42 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 43 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2024 |
| 44 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 45 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 46 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 47 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 48 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 49 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 50 | Miller, James R. | Herrington, KS 67449 | Oil Operator | Jan 2024 |
| 51 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 52 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 53 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 54 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Feb 2024 |
| 55 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 56 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 57 | Moran-K Oil LLC | Seminole, OK 74818-1295 | Oil & Gas Operator | Feb 2024 |
| 58 | Moze Inc | Ochelata, OK 74051 | Oil & Gas Operator | Jan 2001 |
| 59 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 60 | Mullins John S | Hominy, OK 74035 | Oil Operator | Nov 2014 |
| 61 | Murphy Jack L | Tulsa, OK 74104-4915 | Oil Operator | Mar 2015 |
| 62 | Murphy S J Oil & Gas Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2024 |
| 63 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 64 | Myers Robert L Dba RLM Oil Co | | Oil Operator | Jan 2024 |