| 1101 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 1102 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Jun 2025 |
| 1103 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 1104 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 1105 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 1106 | McMurtrie Oil Inc | | Oil & Gas Operator | Jun 2025 |
| 1107 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | Dec 2025 |
| 1108 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | Dec 2025 |
| 1109 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 1110 | McNeill Randy & W R | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2013 |
| 1111 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 1112 | McNeish Oil Operations | | Oil Operator | Nov 2019 |
| 1113 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 1114 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 1115 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 1116 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 1117 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 1118 | McO Resources In | | Oil & Gas Operator | Apr 1987 |
| 1119 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 1120 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Jun 2025 |
| 1121 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Aug 2025 |
| 1122 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 1123 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1124 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 1125 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 1126 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 1127 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 1128 | MCQ Natural Gas Co Inc | Leechburg, PA 15656-0594 | Gas Operator | Dec 2012 |
| 1129 | McQuadrangle, LC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2006 |
| 1130 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 1131 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2024 |
| 1132 | McQueeney, John J. | Osawatomie, KS 66064 | Oil Operator | Jan 1985 |
| 1133 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 1134 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jul 2025 |
| 1135 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 1136 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 1137 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 1138 | McRae Exploration, Inc. & Epm | | Oil & Gas Operator | Mar 1978 |
| 1139 | McRae Exploration, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 1140 | McRae Exploration,Inc & Bec | | Oil & Gas Operator | Feb 1984 |
| 1141 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 1142 | McRae, Nathan Rathburn | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 1994 |
| 1143 | McRae, William R. | Scottsdale, AZ 85254 | Oil Operator | Aug 1995 |
| 1144 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 1145 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 1146 | McWhinney Holding Company LLLP | | Oil & Gas Operator | Mar 2021 |
| 1147 | McWhorter, Jimmy L | Louisville, KY 40218 | Oil Operator | Dec 2023 |
| 1148 | MCZ Oil Co, Inc. | | Oil Operator | Feb 1994 |
| 1149 | MCZ, Inc. | Houston, TX 77026 | Oil & Gas Operator | Sep 1990 |
| 1150 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 1151 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 1152 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 1153 | MDF Oil Company | Floresville, TX 78114 | Oil Operator | Dec 2025 |
| 1154 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Dec 2025 |
| 1155 | Mdopps, LLC | Wichita, KS 67203 | Oil Operator | Apr 2023 |
| 1156 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Sep 2025 |
| 1157 | MDS Energy Development LLC | | Oil & Gas Operator | Oct 2025 |
| 1158 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 1159 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2025 |
| 1160 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 1161 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2024 |
| 1162 | Mead, Nathaniel E | Irving, NY 14081 | Gas Operator | Dec 2024 |
| 1163 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 1164 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 1165 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Sep 2025 |
| 1166 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 1167 | Meador Enterprises, Inc. | Kilgore, TX 75662 | Oil Operator | Oct 2023 |
| 1168 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 1169 | Meador Oil Company Inc | Lubbock, TX 79415 | Oil & Gas Operator | Oct 2022 |
| 1170 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 1171 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 1172 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 1173 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Aug 2025 |
| 1174 | Meadow Deep LLC | | Oil & Gas Operator | Oct 2025 |
| 1175 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 1176 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Sep 2025 |
| 1177 | Meadowlark Operating Co | | Oil & Gas Operator | Aug 2025 |
| 1178 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 1179 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 1180 | Meadows, Kelly J | | Oil & Gas Operator | Mar 2015 |
| 1181 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 1182 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | Dec 2025 |
| 1183 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 1184 | Mears, John C. | Chanute, KS 66720 | Oil Operator | Dec 2017 |
| 1185 | Meason Oper. Co. For Cinco Energy Corp. | | Oil & Gas Operator | Sep 2000 |
| 1186 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 1187 | Meb, LLC | Austin, TX 78737 | Oil Operator | Dec 2025 |
| 1188 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 1189 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 1190 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 1191 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 1192 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 1193 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 1194 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 1195 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 1196 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 1197 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 1198 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 1199 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 1200 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |