| 1101 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 1102 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 1103 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 1104 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 1105 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 1106 | McO Resources In | | Oil & Gas Operator | Apr 1987 |
| 1107 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 1108 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Jun 2025 |
| 1109 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Jun 2025 |
| 1110 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 1111 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1112 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 1113 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 1114 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 1115 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 1116 | McQuadrangle, LC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2006 |
| 1117 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 1118 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2024 |
| 1119 | McQueeney, John J. | Osawatomie, KS 66064 | Oil Operator | Jan 1985 |
| 1120 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 1121 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jun 2025 |
| 1122 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 1123 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 1124 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 1125 | McRae Exploration, Inc. & Epm | | Oil & Gas Operator | Mar 1978 |
| 1126 | McRae Exploration, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 1127 | McRae Exploration,Inc & Bec | | Oil & Gas Operator | Feb 1984 |
| 1128 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 1129 | McRae, Nathan Rathburn | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 1994 |
| 1130 | McRae, William R. | Scottsdale, AZ 85254 | Oil Operator | Aug 1995 |
| 1131 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 1132 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 1133 | McWhinney Holding Company LLLP | | Oil & Gas Operator | Mar 2021 |
| 1134 | McWhorter, Jimmy L | Louisville, KY 40218 | Oil Operator | Dec 2023 |
| 1135 | MCZ Oil Co, Inc. | | Oil Operator | Feb 1994 |
| 1136 | MCZ, Inc. | Houston, TX 77026 | Oil & Gas Operator | Sep 1990 |
| 1137 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 1138 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 1139 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 1140 | MDF Oil Company | Floresville, TX 78114 | Oil Operator | Oct 2025 |
| 1141 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Oct 2025 |
| 1142 | Mdopps, LLC | Wichita, KS 67203 | Oil Operator | Apr 2023 |
| 1143 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Jul 2025 |
| 1144 | MDS Energy Development LLC | | Oil & Gas Operator | Aug 2025 |
| 1145 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 1146 | MDW Capital, Inc. | Williamstown, WV 26187 | Oil & Gas Operator | Dec 2021 |
| 1147 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Oct 2025 |
| 1148 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 1149 | Me3 Oilfield Service LLC | Tulsa, OK 74136-1236 | Oil & Gas Operator | Jun 2025 |
| 1150 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2024 |
| 1151 | Mead, Nathaniel E | Irving, NY 14081 | Gas Operator | Dec 2024 |
| 1152 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 1153 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 1154 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jun 2025 |
| 1155 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 1156 | Meador Enterprises, Inc. | Kilgore, TX 75662 | Oil Operator | Oct 2023 |
| 1157 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 1158 | Meador Oil Company Inc | Lubbock, TX 79415 | Oil & Gas Operator | Oct 2022 |
| 1159 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 1160 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 1161 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 1162 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Jun 2025 |
| 1163 | Meadow Deep LLC | | Oil & Gas Operator | Aug 2025 |
| 1164 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 1165 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jul 2025 |
| 1166 | Meadowlark Operating Co | | Oil & Gas Operator | May 2025 |
| 1167 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 1168 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 1169 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 1170 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | Oct 2025 |
| 1171 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 1172 | Mears, John C. | Chanute, KS 66720 | Oil Operator | Dec 2017 |
| 1173 | Meason Oper. Co. For Cinco Energy Corp. | | Oil & Gas Operator | Sep 2000 |
| 1174 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 1175 | Meb, LLC | Austin, TX 78737 | Oil Operator | Oct 2025 |
| 1176 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 1177 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 1178 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 1179 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 1180 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 1181 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 1182 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 1183 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 1184 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 1185 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 1186 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 1187 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 1188 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 1189 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Apr 2025 |
| 1190 | Medlen, Dean S. | Rantoul, KS 66079 | Oil Operator | Aug 1993 |
| 1191 | Medora Minerals, LLC | | Oil & Gas Operator | Aug 2025 |
| 1192 | Meeder, Curt N. | Ripley, NY 14775 | Gas Operator | Dec 2024 |
| 1193 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 1194 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 1195 | Meeks, Mike | Tulsa, OK 74136 | Oil Operator | Jan 2025 |
| 1196 | Meerkat Logistics And Operations LLC | Tuscaloosa, AL 35401 | Oil Operator | Jul 2025 |
| 1197 | Mega Drilling Company | | Oil Operator | Feb 1984 |
| 1198 | Mega Energy LLC | Gillette, WY 82718 | Gas Operator | Aug 2025 |
| 1199 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 1200 | Mega Petroleum C | | Oil Operator | Jun 1990 |