| 19001 | McKenzie Production Company | Houston, TX 77063 | Oil & Gas Operator | May 1995 |
| 19002 | McKinney Kenneth R | Okmulgee, OK 74447-6932 | Oil Operator | Aug 2000 |
| 19003 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 19004 | McKinney, Jason G. | | Oil Operator | Dec 2021 |
| 19005 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 19006 | McKnight, C. L. | McLeod, TX 75565 | Oil & Gas Operator | Apr 2025 |
| 19007 | McKnight, C. L. Oil Co. LLP | McLeod, TX 75565 | Oil & Gas Operator | Apr 2025 |
| 19008 | McKnight, J. C. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2019 |
| 19009 | MCL 1 Oil & Gas Wyoming LLC | Minneapolis, MN 55402 | Oil & Gas Operator | Jul 2018 |
| 19010 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 19011 | McLain J. Forman | | Oil & Gas Operator | Mar 1988 |
| 19012 | McLane Trust* Dixie | | Gas Operator | Dec 2024 |
| 19013 | McLaurin Oil Co. | | Oil Operator | Jan 2025 |
| 19014 | McLelland Engineering & MGMT. | Houston, TX 77042 | Oil & Gas Operator | Mar 1999 |
| 19015 | McLemore, Laurence | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 19016 | McLennan Family Properties LLP | | Oil & Gas Operator | Dec 2021 |
| 19017 | McLeod Gas Gath & Proc Co. L.L.C. | | Oil Operator | Jul 2012 |
| 19018 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 19019 | McLester Oil & G | | Oil & Gas Operator | Jun 1992 |
| 19020 | McLish & Luff | Denver, CO 80202 | Gas Operator | Nov 1972 |
| 19021 | McLish, Holmes P | Denver, CO 80202 | Oil & Gas Operator | Dec 1983 |
| 19022 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 19023 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 19024 | MCM Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2025 |
| 19025 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 19026 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 19027 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 19028 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 19029 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 19030 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 19031 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jan 2025 |
| 19032 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Apr 2025 |
| 19033 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 19034 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 19035 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 19036 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |
| 19037 | McMullan Oil Company | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2023 |
| 19038 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 19039 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Nov 2024 |
| 19040 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 19041 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 19042 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 19043 | McMurtrie Bill Jr | Bartlesville, OK 74003 | Oil & Gas Operator | Nov 2024 |
| 19044 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | Apr 2025 |
| 19045 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | Apr 2025 |
| 19046 | McNeal & Shahan Oil Co Inc | | Oil & Gas Operator | Apr 2014 |
| 19047 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 19048 | McNeill Randy & W R | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2013 |
| 19049 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 19050 | McNeish Oil Operations | | Oil Operator | Nov 2019 |
| 19051 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 19052 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 19053 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 19054 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 19055 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 19056 | McO Resources In | | Oil & Gas Operator | Apr 1987 |
| 19057 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 19058 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Jul 2024 |
| 19059 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Jan 2025 |
| 19060 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 19061 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 19062 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 19063 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 19064 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 19065 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 19066 | MCQ Natural Gas Co Inc | Leechburg, PA 15656-0594 | Gas Operator | Dec 2012 |
| 19067 | McQuadrangle, LC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2006 |
| 19068 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 19069 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2019 |
| 19070 | McQueeney, John J. | Osawatomie, KS 66064 | Oil Operator | Jan 1985 |
| 19071 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 19072 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Dec 2024 |
| 19073 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 19074 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 19075 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 19076 | McRae Exploration, Inc. & Epm | | Oil & Gas Operator | Mar 1978 |
| 19077 | McRae Exploration, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 19078 | McRae Exploration,Inc & Bec | | Oil & Gas Operator | Feb 1984 |
| 19079 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 19080 | McRae, Nathan Rathburn | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 1994 |
| 19081 | McRae, William R. | Scottsdale, AZ 85254 | Oil Operator | Aug 1995 |
| 19082 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 19083 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 19084 | McWhinney Holding Company LLLP | | Oil & Gas Operator | Mar 2021 |
| 19085 | McWhorter, Jimmy L | Louisville, KY 40218 | Oil Operator | Dec 2023 |
| 19086 | MCZ Oil Co, Inc. | | Oil Operator | Feb 1994 |
| 19087 | MCZ, Inc. | Houston, TX 77026 | Oil & Gas Operator | Sep 1990 |
| 19088 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 19089 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 19090 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 19091 | MDF Oil Company | Floresville, TX 78114 | Oil Operator | Apr 2025 |
| 19092 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Apr 2025 |
| 19093 | Mdopps, LLC | Wichita, KS 67203 | Oil Operator | Apr 2023 |
| 19094 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Jan 2025 |
| 19095 | MDS Energy Development LLC | | Oil & Gas Operator | Feb 2025 |
| 19096 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 19097 | MDW Capital, Inc. | Williamstown, WV 26187 | Oil & Gas Operator | Dec 2021 |
| 19098 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Apr 2025 |
| 19099 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 19100 | Me3 Oilfield Service LLC | Tulsa, OK 74136-1236 | Oil & Gas Operator | Dec 2024 |