| 3001 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 3002 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 3003 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 3004 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 3005 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 3006 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 3007 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 3008 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 3009 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 3010 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 3011 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 3012 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 3013 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 3014 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 3015 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 3016 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 3017 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 3018 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 3019 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 3020 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 3021 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 3022 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |
| 3023 | Monroe Well Service-HGC | | Oil Operator | Dec 1988 |
| 3024 | Monroe Well Service-Lebo | | Oil Operator | Jun 1989 |
| 3025 | Monroe Well Service-Lexington | | Oil Operator | Feb 1989 |
| 3026 | Monroe Well Service-Newtown | | Oil Operator | Aug 1990 |
| 3027 | Monroe Well Service-Ocean | | Oil Operator | Feb 1989 |
| 3028 | Monroe Well Service-Oceanyacht | | Oil Operator | Jan 1989 |
| 3029 | Monroe Well Service-Oil City | | Oil Operator | Aug 1992 |
| 3030 | Monroe Well Service-Omega | | Oil Operator | Aug 1992 |
| 3031 | Monroe Well Service-Par | | Oil Operator | Jan 1990 |
| 3032 | Monroe Well Service-Petrol | | Oil Operator | Sep 1992 |
| 3033 | Monroe Well Service-Petrovest | | Oil Operator | Dec 1988 |
| 3034 | Monroe Well Service-PRG | | Oil Operator | Nov 1990 |
| 3035 | Monroe Well Service-Redstone | | Oil Operator | Jul 1989 |
| 3036 | Monroe Well Service-RVS | | Oil Operator | Dec 1990 |
| 3037 | Monroe Well Service-Shemen | | Oil Operator | Dec 1988 |
| 3038 | Monroe Well Service-Shemen1984 | | Oil Operator | Jan 1989 |
| 3039 | Monroe Well Service-Shemen1985 | | Oil Operator | Nov 1990 |
| 3040 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 3041 | Monroe Well Service-SPD | | Oil Operator | Dec 1988 |
| 3042 | Monroe Well Service-SPD 1985 | | Oil Operator | Dec 1988 |
| 3043 | Monroe Well Service-TBR | | Oil Operator | Aug 1991 |
| 3044 | Monroe Well Service-TG I | | Oil Operator | Oct 1990 |
| 3045 | Monroe Well Service-TG II | | Oil Operator | Oct 1990 |
| 3046 | Monroe Well Service-TG III | | Oil Operator | Jul 1992 |
| 3047 | Monroe Well Service-TG VI | | Oil Operator | Aug 1989 |
| 3048 | Monroe Well Service-Tpa 1985 | | Oil Operator | Dec 1990 |
| 3049 | Monroe Well Service-Vista | | Oil Operator | Nov 1990 |
| 3050 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 3051 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 3052 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 3053 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 3054 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 3055 | Monterey Resources LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2019 |
| 3056 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 3057 | Moon-Hines-Tigrett Opr Co Inc | | Oil & Gas Operator | Oct 1995 |
| 3058 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 3059 | Moore Oil & Gas-Marion Corp. | | Oil & Gas Operator | Nov 1986 |
| 3060 | Moore&Munger Hydrocarbons Inc | | Oil Operator | May 1987 |
| 3061 | Mooringsport Energy Prod Corp | | Oil & Gas Operator | Oct 1994 |
| 3062 | Mooringsport Energy Trans Corp | | Oil Operator | Apr 1990 |
| 3063 | Moran Exploration, Inc. | | Oil & Gas Operator | Jan 1985 |
| 3064 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 3065 | Moransco Energy Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 3066 | Moro Bay Oil Company, Inc. | | Oil Operator | Jan 1997 |
| 3067 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 3068 | Moseley Petroleum Corp. | | Oil & Gas Operator | Apr 1988 |
| 3069 | Mountain Front Pipeline Co, Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 3070 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 3071 | Mrs. C. M. Roberson | | Oil Operator | Mar 1989 |
| 3072 | Mrs. Cecile Andries & Sons | | Oil Operator | Dec 2006 |
| 3073 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 3074 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 3075 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 3076 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 3077 | Munday Operating Co., L.L.C. | | Oil & Gas Operator | May 2007 |
| 3078 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 3079 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Feb 2024 |
| 3080 | Murexco Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 3081 | Murphrey Oil Co | | Oil Operator | Jan 2024 |
| 3082 | Murphy - Sun | | Oil & Gas Operator | May 1989 |
| 3083 | Murphy Exp & Prod Co.-USA | | Oil & Gas Operator | May 2014 |
| 3084 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 3085 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 3086 | Murray J. Evans | | Oil Operator | Mar 1985 |
| 3087 | Muslow And Parker | | Oil & Gas Operator | Jul 1994 |
| 3088 | Muslow Oil Industries | | Oil Operator | Jan 1995 |
| 3089 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 3090 | Mustang Energy L C | | Oil & Gas Operator | Jan 2013 |
| 3091 | MVP Production Inc. | | Oil & Gas Operator | Apr 2005 |
| 3092 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 3093 | N And B Exploration, Inc. | | Oil & Gas Operator | Jun 1993 |
| 3094 | N Central Casing Pullers, Inc. | | Oil & Gas Operator | May 1994 |
| 3095 | N. B. Hunt | | Oil & Gas Operator | May 1981 |
| 3096 | N. E. Loomis | | Oil Operator | Oct 1986 |
| 3097 | N. J. Pardue | | Oil & Gas Operator | Jul 1994 |
| 3098 | N. R. Price | | Oil & Gas Operator | Nov 1983 |
| 3099 | N. T. Rutledge Oil Co. | | Oil Operator | Jan 1989 |
| 3100 | N. W. Corporation | | Gas Operator | Jan 1989 |