| 201 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Sep 2025 |
| 202 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 203 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 204 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 205 | Metro Energy, Inc. | Gladstone, MO 64118 | Oil Operator | May 1997 |
| 206 | Metro Oil Compan | | Oil Operator | Jan 1991 |
| 207 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 208 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 209 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 210 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Sep 2025 |
| 211 | Mica Energy Corp | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 212 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Sep 2025 |
| 213 | Michael D. Weilert Oil Company | | Oil Operator | Sep 2025 |
| 214 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 215 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 216 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 217 | Mid America Ener | | Oil Operator | Nov 1993 |
| 218 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 219 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Feb 2026 |
| 220 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 221 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 222 | Mid Kansas Gas Gathering | | Gas Operator | Sep 2025 |
| 223 | Mid States Energ | | Oil Operator | Aug 1985 |
| 224 | Mid States Gener | | Oil Operator | Apr 1988 |
| 225 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 226 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 227 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 228 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 229 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 230 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 231 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 232 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 233 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 234 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 235 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Sep 2025 |
| 236 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 237 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 238 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 239 | Midnight Energy Operating LLC | Drumright, OK 74030 | Oil Operator | Nov 2025 |
| 240 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 241 | Midstates Energy Operating, LLC | FT Myers, FL 33912 | Oil Operator | Sep 2025 |
| 242 | Midway Drilling | | Oil & Gas Operator | Dec 1996 |
| 243 | Midway Operating Co. | Great Bend, KS 67530 | Oil Operator | Jan 1998 |
| 244 | Midwest Oil, LLC | Destin, FL 32541 | Oil Operator | Sep 2025 |
| 245 | Midwest Turf | El Dorado, KS 67042 | Oil Operator | Jun 1998 |
| 246 | Midwestern Exploration Company | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 247 | Midwestern Oil C | | Oil & Gas Operator | May 1995 |
| 248 | Midwestern Suppl | | Oil Operator | Oct 1986 |
| 249 | Migwis | Great Bend, KS 67530 | Oil Operator | Mar 1988 |
| 250 | Mike Blaes & Peggy Blaes, A General Partnership | Cherryvale, KS 67335 | Oil Operator | Mar 2025 |
| 251 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Sep 2025 |
| 252 | Mikol Oil LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 253 | Milburn, Harold J. | Hutchinson, KS 67502 | Oil & Gas Operator | Sep 2003 |
| 254 | Millennium Oil & Gas Inc | Dexter, KS 67038 | Oil & Gas Operator | Dec 2024 |
| 255 | Miller Bros Oil Company, Inc. | Burlington, KS 66839 | Oil Operator | Dec 2009 |
| 256 | Miller Energy, LLC | Garnett, KS 66032 | Oil Operator | Nov 2019 |
| 257 | Miller I O Incor | | Oil & Gas Operator | Apr 1991 |
| 258 | Miller Oil Company, LLC | Chanute, KS 66720 | Oil Operator | Jun 2025 |
| 259 | Miller, Abbe Wayne | Macksville, KS 67557 | Gas Operator | Aug 2018 |
| 260 | Miller, Bobby Elzo | Sedan, KS 67361 | Oil Operator | Dec 2009 |
| 261 | Miller, Everett E. | Sedan, KS 67361 | Oil & Gas Operator | Sep 1986 |
| 262 | Miller, James R | Herrington, KS 67449 | Oil Operator | Nov 2025 |
| 263 | Miller, Myron R. | Haven, KS 67543 | Oil Operator | Oct 2017 |
| 264 | Miller, Ralph D. & Faye C. | Cherryvale, KS 67335 | Oil Operator | Apr 2003 |
| 265 | Miller, Robert A. | Sedan, KS 67361 | Oil Operator | Aug 2022 |
| 266 | Miller-Becker Enterprises, LLC | Russell, KS 67665 | Oil Operator | Jul 2025 |
| 267 | Mills, Norman | Lake City, KS 67071 | Oil Operator | Dec 1995 |
| 268 | Mills, Ralph A. | Louisburg, KS 66053 | Oil Operator | May 1998 |
| 269 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 270 | Minner Oil Field Service | | Oil Operator | Jul 2008 |
| 271 | Mishler Oil | | Oil Operator | May 1989 |
| 272 | Missouri River R | | Gas Operator | Jun 1993 |
| 273 | Mitchell Energy | | Oil & Gas Operator | Dec 1996 |
| 274 | Mitchell Wyatt B | | Oil Operator | Aug 1993 |
| 275 | Miura Petroleum | | Oil Operator | Dec 1992 |
| 276 | Miura Petroleum Inc | Topeka, KS 66603 | Oil & Gas Operator | May 2006 |
| 277 | Miway Operations | Russell, KS 67665 | Oil Operator | Aug 1994 |
| 278 | MJ Energy LLC | Denver, CO 80206 | Oil Operator | Jan 2025 |
| 279 | MJT Oil | | Oil Operator | Sep 2025 |
| 280 | MKJ Oil Co LLC | Harper, KS 67058 | Oil & Gas Operator | Sep 2025 |
| 281 | MLT Energy, LLC | Derby, KS 67037 | Oil Operator | Nov 2025 |
| 282 | Mo-Kan Oil Group | St. Louis, MO 63131 | Oil Operator | Sep 2001 |
| 283 | Mo-Tech Energy I | | Gas Operator | Dec 1993 |
| 284 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 285 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 286 | Moff Oil Company | Pratt, KS 67124 | Gas Operator | Apr 1988 |
| 287 | Mohawk Petroleum | | Oil & Gas Operator | Jan 1995 |
| 288 | Mohr, Steve | Maize, KS 67101 | Oil Operator | Aug 2022 |
| 289 | Molitor Oil, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Sep 2025 |
| 290 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Dec 2025 |
| 291 | Monarch Energy C | | Oil Operator | Nov 1987 |
| 292 | Monarch Energy LLC | Paola, KS 66071 | Oil Operator | Sep 2025 |
| 293 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 294 | Monfort, Roy C. | Iola, KS 66749 | Oil & Gas Operator | Sep 1989 |
| 295 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 296 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 297 | Montgomery Count | | Oil Operator | Dec 1992 |
| 298 | Montgomery Production & Operating LLC | Herington, KS 67449 | Oil & Gas Operator | Sep 2025 |
| 299 | Monument Resources, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jun 2012 |
| 300 | Moore McCormack | | Gas Operator | Feb 1991 |