| 201 | McKay Oil Company | Perry, OK 73077 | Oil Operator | Nov 2008 |
| 202 | McKee Energy Company Inc | Pawhuska, OK 74056 | Oil & Gas Operator | Apr 2011 |
| 203 | McKenzie Petroleum Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 204 | McKinney Kenneth R | Okmulgee, OK 74447-6932 | Oil Operator | Aug 2000 |
| 205 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 206 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 207 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 208 | McMillin C C & Company Inc | Guthrie, OK 73044-0546 | Oil & Gas Operator | Jan 2024 |
| 209 | McMurtrie Bill Jr | Bartlesville, OK 74003 | Oil & Gas Operator | Aug 2023 |
| 210 | McNeal & Shahan Oil Co Inc | | Oil & Gas Operator | Apr 2014 |
| 211 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 212 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Jan 2024 |
| 213 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 214 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 215 | McOil Operating Company LLC | Muskogee, OK 74402 | Oil & Gas Operator | Jan 2024 |
| 216 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 217 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 218 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 219 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Feb 2024 |
| 220 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 221 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 222 | Meador Oil Company Inc | Lubbock, TX 79408-2219 | Oil & Gas Operator | Oct 2022 |
| 223 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 224 | Meadors Operating Co | | Oil Operator | Jan 2024 |
| 225 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Feb 2024 |
| 226 | Meadowlark Operator Co | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2024 |
| 227 | Meason Petroleum LLC | | Oil & Gas Operator | Dec 2016 |
| 228 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 229 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 230 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 231 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 232 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 233 | Medina-Pierce Oil & Gas Co | | Oil & Gas Operator | Feb 2012 |
| 234 | Meek Joe E | | Oil Operator | Jul 2010 |
| 235 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 236 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 237 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 238 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 239 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2024 |
| 240 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 241 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 242 | Mep Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 243 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 244 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 245 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 246 | Mercury Production Company | Fort Worth, TX 76113 | Gas Operator | Aug 2012 |
| 247 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 248 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 249 | Merica Oil Operating Company | | Oil & Gas Operator | Jan 2024 |
| 250 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 251 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Oct 2022 |
| 252 | Meridian Oil Trading Inc | Houston, TX 77060 | Oil & Gas Operator | Mar 2014 |
| 253 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 254 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 255 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 256 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 257 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 258 | Mesa Exploration Company Inc | Dallas, TX 75206-0500 | Oil & Gas Operator | Jan 2024 |
| 259 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 260 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 261 | Metro Energy LTD | Scottsdale, AZ 85254 | Oil Operator | Aug 2000 |
| 262 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 263 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 264 | Mewbourne Marketing Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2013 |
| 265 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 266 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Dec 2023 |
| 267 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 268 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Dec 2023 |
| 269 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jan 2024 |
| 270 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 271 | Michael Goodnight Operating LLC | Saint Louis, OK 74866-0051 | Oil & Gas Operator | Jan 2024 |
| 272 | Michaels, Bobby W | | Oil Operator | Nov 1998 |
| 273 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 274 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2024 |
| 275 | Mickalson Petroleum Company | | Oil & Gas Operator | Mar 1993 |
| 276 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 277 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 278 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 279 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 280 | Mid-Con Gas Corp | Yukon, OK 73099 | Oil & Gas Operator | Feb 2014 |
| 281 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 282 | Mid-Continent Petroleum Corp | | Oil & Gas Operator | Mar 2017 |
| 283 | Mid-Continent Petroleum Management Inc | Cement, OK 73017-0600 | Oil & Gas Operator | Jan 2024 |
| 284 | Mid-Way Environmental Services Inc | Stroud, OK 74079-0579 | Oil Operator | Feb 2022 |
| 285 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 286 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 287 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 288 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 289 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 290 | Midstate Oil & Gas Company | Shawnee, OK 74802-1807 | Oil & Gas Operator | Jan 2024 |
| 291 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 292 | Midway Leasing Inc | Haskell, OK 74436-2406 | Oil & Gas Operator | Jan 2024 |
| 293 | Midway Operating Company, L.L.C. | Woodward, OK 73802 | Oil & Gas Operator | Apr 2024 |
| 294 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 295 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Jan 2024 |
| 296 | Midwest Eor Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | May 2013 |
| 297 | Midwest Oil Company | Beggs, OK 74421-2976 | Oil Operator | Apr 2015 |
| 298 | Midwest Operating Company Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | Nov 1999 |
| 299 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 300 | Midwestern Exploration Co. | Edmond, OK 73013 | Oil & Gas Operator | Dec 2023 |