| 201 | Lario Oil & Gas | | Oil & Gas Operator | Nov 1995 |
| 202 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 203 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 204 | Lasso Energy LLC | Chase, KS 67524 | Oil & Gas Operator | Mar 2025 |
| 205 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 206 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 207 | Loeb Herman L | | Oil & Gas Operator | Jan 1996 |
| 208 | Longhorn Energy | | Oil & Gas Operator | Jun 1991 |
| 209 | Lotus Operating Company, L.L.C. | Wichita, KS 67204 | Oil & Gas Operator | Mar 2025 |
| 210 | Lozoya, Jesus Antonio | Coldwater, KS 67029 | Oil & Gas Operator | Mar 2025 |
| 211 | M & M Exploration, Inc. | Westminster, CO 80031 | Oil & Gas Operator | May 2025 |
| 212 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 213 | M & M Well Service, LLC | Medicine Lodge, KS 67104 | Gas Operator | Mar 2025 |
| 214 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Apr 2025 |
| 215 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 216 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 217 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 218 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 219 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 220 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2025 |
| 221 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 222 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 223 | McCandless Rober | | Oil & Gas Operator | May 1991 |
| 224 | McCoy Petroleum | | Oil & Gas Operator | Aug 1996 |
| 225 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Jun 2025 |
| 226 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 227 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Apr 2025 |
| 228 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 229 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 230 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 231 | McGrath, Rollie | Lake City, KS 67071 | Gas Operator | Mar 2025 |
| 232 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 233 | Mega Petroleum C | | Oil Operator | Jun 1990 |
| 234 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 235 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Mar 2025 |
| 236 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 237 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 238 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Mar 2025 |
| 239 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 240 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Mar 2025 |
| 241 | Mills, Norman | Lake City, KS 67071 | Oil Operator | Dec 1995 |
| 242 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 243 | Molz Oil Company | Kiowa, KS 67070 | Oil & Gas Operator | May 2025 |
| 244 | Morsey Oil & Gas | | Oil & Gas Operator | Mar 1995 |
| 245 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 246 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 247 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Mar 2025 |
| 248 | Musgrove Petrole | | Oil & Gas Operator | Dec 1996 |
| 249 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 250 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 251 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 252 | N-10 Exploration, LLC | Attica, KS 67009 | Oil & Gas Operator | Mar 2025 |
| 253 | Nash Oil & Gas, Inc. | Newton, KS 67114 | Oil & Gas Operator | Mar 2025 |
| 254 | National Coopera | | Oil & Gas Operator | Mar 1992 |
| 255 | National Oil Com | | Oil & Gas Operator | Oct 1992 |
| 256 | National Petroleum Reserves, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2012 |
| 257 | Navajo Oil Company | Wichita, KS 67206 | Gas Operator | May 2011 |
| 258 | Nec Operating - Kansas, LLC | Southlake, TX 76092 | Oil & Gas Operator | Mar 2025 |
| 259 | Nixon R P Operat | | Oil Operator | Aug 1995 |
| 260 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 261 | North American Drilling & Exploration, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Aug 2015 |
| 262 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 263 | Oil Property Management, Inc. | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 264 | Oil-Tech Prod Co | | Oil & Gas Operator | Oct 1992 |
| 265 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 266 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 267 | Oleum Incorporat | | Gas Operator | Dec 1990 |
| 268 | Oneok Exploratio | | Oil & Gas Operator | Mar 1995 |
| 269 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 270 | Osage Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 271 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 272 | Packard Energy LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Mar 2025 |
| 273 | Packard, Lynn | Medicine Lodge, KS | Oil & Gas Operator | Feb 2025 |
| 274 | Patton Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 275 | Petro-Technology | | Oil & Gas Operator | Aug 1991 |
| 276 | Petro-Technology, Inc. | Topeka, KS 66604 | Gas Operator | Dec 1997 |
| 277 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 278 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 279 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 280 | Petroleum Property Services, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 281 | Petroleum Techno | | Oil & Gas Operator | Dec 1996 |
| 282 | Petroleum Technologies, Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Mar 2025 |
| 283 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 284 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Mar 2025 |
| 285 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 286 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 287 | Pollok Energy LLC | Tulsa, OK 74159 | Oil & Gas Operator | May 2025 |
| 288 | Prairie Resources Inc | Hays, KS 67601 | Oil & Gas Operator | Sep 2009 |
| 289 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Mar 2025 |
| 290 | Pratt Well Servi | | Oil & Gas Operator | Jul 1996 |
| 291 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Mar 2025 |
| 292 | Premiere Corporation | Wellington, KS 67152 | Oil Operator | Nov 2010 |
| 293 | Presley Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 294 | Pride Energy Company, A General Partnership | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2021 |
| 295 | Prisum Ventures | | Oil & Gas Operator | Oct 1995 |
| 296 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | May 2025 |
| 297 | R & B Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 298 | R & B Oil & Gas, Inc. | Attica, KS 67009 | Oil & Gas Operator | Mar 2025 |
| 299 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 300 | R.C.Taylor Companies, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |