| 201 | Lansing Energy C | | Oil Operator | Jun 2006 |
| 202 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 203 | Lasmo Energy Cor | | Oil Operator | Feb 1990 |
| 204 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 205 | Lawbanco Drillin | | Oil Operator | Feb 1995 |
| 206 | Lawbanco Drilling, Inc. | Natoma, KS 67651 | Oil Operator | May 1998 |
| 207 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 208 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 209 | Lebsack, James S. | Denver, CO 80222 | Oil Operator | Sep 1998 |
| 210 | Liberty Enterpri | | Oil Operator | Jan 1987 |
| 211 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 212 | Lucky Iron | | Oil Operator | Sep 2025 |
| 213 | M & G Oil Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 214 | Mad Operators LLC | | Oil & Gas Operator | Sep 2025 |
| 215 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 216 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 217 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Sep 2025 |
| 218 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 219 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 220 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 221 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 222 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 223 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Feb 2026 |
| 224 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Dec 2025 |
| 225 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 226 | Meridian Energy Inc. | | Oil Operator | Sep 2025 |
| 227 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 228 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 229 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Sep 2025 |
| 230 | Mikol Oil LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 231 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 232 | Morrison-Dixon O | | Oil Operator | Oct 1993 |
| 233 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 234 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 235 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |
| 236 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 237 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 238 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 239 | N.F. Producers, Inc. | Berthoud, CO 80513 | Oil Operator | Sep 2025 |
| 240 | Nadel & Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 241 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 242 | National Develop | | Oil & Gas Operator | Jan 1990 |
| 243 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 244 | New Age Oil LLC | Hays, KS 67601 | Oil & Gas Operator | Sep 2025 |
| 245 | Nixon R P Operat | | Oil Operator | Aug 1995 |
| 246 | Noah, Calvin | Valley Center, KS 67147 | Oil Operator | Oct 2010 |
| 247 | Noble Petroleum, Inc. | Wichita, KS 67205 | Oil Operator | Sep 2013 |
| 248 | Noir-Blanc | Russell, KS 67665 | Oil Operator | May 1992 |
| 249 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Sep 2025 |
| 250 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 251 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 252 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 253 | Oil Property Man | | Oil & Gas Operator | Jun 1995 |
| 254 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 255 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 256 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 257 | Palomino Petroleum | Newton, KS 67114 | Oil Operator | Oct 2003 |
| 258 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Sep 2025 |
| 259 | Paradise Creek Oil & Gas | Plainville, KS 67663 | Oil Operator | Jun 2025 |
| 260 | Patterson Energy LLC | Hays, KS 67601 | Oil & Gas Operator | Sep 2025 |
| 261 | Patterson Production Co. | Phillipsburg, KS 67661 | Oil Operator | Jul 1998 |
| 262 | Patton Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2007 |
| 263 | Paul Bowman Oil | | Oil Operator | Jul 2000 |
| 264 | Paul Bowman Oil Trust | Codell, KS 67663 | Oil Operator | Sep 2025 |
| 265 | Paxco, Inc. | Hays, KS 67601 | Oil & Gas Operator | Sep 2025 |
| 266 | Petr Exploration | | Oil Operator | Apr 1995 |
| 267 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 268 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 269 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 270 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Feb 2026 |
| 271 | Petroventures In | | Oil Operator | Apr 1987 |
| 272 | Petx Petroleum C | | Oil Operator | Nov 1993 |
| 273 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 274 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 275 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Sep 2025 |
| 276 | Pioneer Operations, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 277 | Pittman Kenneth | | Oil Operator | Mar 1995 |
| 278 | Pohlman Oil LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 279 | Prairie Oil Partners | Hays, KS 67601 | Oil Operator | May 1999 |
| 280 | Pride Energy Company, A General Partnership | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2021 |
| 281 | Producers Equipm | | Oil Operator | Dec 1996 |
| 282 | Production Drill | | Oil Operator | Oct 1994 |
| 283 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 284 | Prospect Oil & G | | Oil Operator | Feb 1996 |
| 285 | Prospect Oil & Gas Corp | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 286 | Pywell Venture A | | Oil Operator | Apr 1988 |
| 287 | Quest Energy LLC | Salina, KS 67401 | Oil Operator | Sep 2025 |
| 288 | R. D. Finnesy Oil | | Oil Operator | Nov 2019 |
| 289 | R. P. Nixon Operations, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 290 | Raelee Oil LLC | Plainville, KS 67663 | Oil Operator | Jul 2021 |
| 291 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 292 | Ram Petroleum Co | | Oil & Gas Operator | Sep 1983 |
| 293 | Rampike Resources, LTD | Denver, CO 80202 | Oil Operator | Nov 2025 |
| 294 | Raney Oil Company, LLC | Lawrence, KS 66049 | Oil & Gas Operator | Sep 2025 |
| 295 | Range Oil Compan | | Oil & Gas Operator | Nov 1995 |
| 296 | Rebel Oil LLC | | Oil Operator | Sep 2025 |
| 297 | Reilly Oil Company, Inc. | Wakeeney, KS 67672 | Oil Operator | Sep 2025 |
| 298 | RGN Company, Inc. | Stockton, KS 67669 | Oil Operator | Aug 2025 |
| 299 | Richardson J Mar | | Oil & Gas Operator | Apr 1995 |
| 300 | Rider Oil & Gas | | Oil Operator | Aug 1991 |