| 201 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 202 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 203 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 204 | Mustang Energy Corporation | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 205 | Myers Robert W J | | Oil Operator | Jun 1991 |
| 206 | N-B Company Inco | | Oil & Gas Operator | Apr 1992 |
| 207 | Nadel & Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 208 | National Coopera | | Oil & Gas Operator | Mar 1992 |
| 209 | National Oil Com | | Oil & Gas Operator | Oct 1992 |
| 210 | National Petroleum Reserves, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2012 |
| 211 | Nec Operating - Kansas, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 212 | New Age Oil LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 213 | Noah, Calvin | Valley Center, KS 67147 | Oil Operator | Oct 2010 |
| 214 | Norstar Petroleum Inc | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 215 | Northern Lights Oil Company, LLC | Andover, KS 67002 | Oil & Gas Operator | Dec 2025 |
| 216 | Osborn Heirs Com | | Oil & Gas Operator | May 1995 |
| 217 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 218 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 219 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 220 | Pancanadian Petr | | Oil Operator | Aug 1990 |
| 221 | Patterson Energy LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 222 | Paul Bowman Oil Trust | Codell, KS 67663 | Oil Operator | Dec 2025 |
| 223 | Pelican Hill Oil & Gas, Inc. | Carlsbad, CA 92010 | Oil & Gas Operator | May 2013 |
| 224 | Petro Pak Corpor | | Oil Operator | Aug 1988 |
| 225 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 226 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 227 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 228 | Petroleum Prod. MGMT | | Oil Operator | Nov 1995 |
| 229 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 230 | Petroleum Production Management Inc | Shawnee Mission, KS 66202 | Oil & Gas Operator | Nov 2021 |
| 231 | Petroventures In | | Oil Operator | Apr 1987 |
| 232 | Phillips Exploration Company L.C. | Andover, KS 67002 | Oil & Gas Operator | Dec 2025 |
| 233 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 234 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 235 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Dec 2025 |
| 236 | Pioneer Resources | Jefferson, CO 80456 | Oil Operator | Dec 2009 |
| 237 | Pioneer Resources Inc | Phillipsburg, KS 67661 | Oil & Gas Operator | Oct 2020 |
| 238 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 239 | Pratt, Don E. | Hays, KS 67601 | Oil Operator | Dec 1999 |
| 240 | Price Robert R O | | Oil Operator | Apr 1995 |
| 241 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 242 | Prospect Oil & Gas Corp | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 243 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Jan 2026 |
| 244 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 245 | Rains & Williamson Oil Co Inc | Wichita, KS 67277 | Oil & Gas Operator | Dec 2025 |
| 246 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Feb 2026 |
| 247 | Raney Oil Company | Lawrence, KS 66047 | Oil & Gas Operator | May 1999 |
| 248 | Raney Oil Company, LLC | Lawrence, KS 66049 | Oil & Gas Operator | Dec 2025 |
| 249 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 250 | Red Hills Energy, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2025 |
| 251 | Red Mountain Oil LLC | Golden, CO 80402 | Oil Operator | Nov 1997 |
| 252 | Red Oak Energy, Inc. | Wichita, KS 67207 | Oil & Gas Operator | Dec 2025 |
| 253 | Reef Operating, Inc. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 254 | Reilly Oil Company, Inc. | Wakeeney, KS 67672 | Oil Operator | Dec 2025 |
| 255 | Reilly Oil E & P | | Oil Operator | Dec 2025 |
| 256 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 257 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 258 | Richlan Drilling | | Oil Operator | Dec 1994 |
| 259 | Richlan Drilling, A General Partnership | Beaver, KS 67525 | Oil & Gas Operator | Dec 2025 |
| 260 | Richland Oil Investments, LLC | Palco, KS 67657 | Oil Operator | Dec 2025 |
| 261 | Rider Oil & Gas | | Oil Operator | Aug 1991 |
| 262 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 263 | Ritchie Exploration | | Oil Operator | Aug 1995 |
| 264 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2025 |
| 265 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 266 | RL Investment, LLC | Hill City, KS 67642 | Oil Operator | Dec 2025 |
| 267 | RLT Investment | Morland, KS 67650 | Oil Operator | Mar 2009 |
| 268 | Rome Oil, LLC | Lakewood, CO 80232 | Oil Operator | Oct 2025 |
| 269 | Ron'S Oil Oper I | | Oil Operator | Nov 1994 |
| 270 | Ron'S Oil Operations Inc | Penokee, KS 67659 | Oil Operator | Dec 2018 |
| 271 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 272 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 273 | Rush, Terry L. | Wakeeney, KS 67672 | Oil Operator | Dec 2025 |
| 274 | Russell Oil, Inc. | Edmond, OK 73083 | Oil Operator | Dec 2025 |
| 275 | S.B. Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2019 |
| 276 | Samson Resources | | Oil Operator | Jan 1994 |
| 277 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Jan 2026 |
| 278 | Satchell Creek Petroleum, LLC | Wichita, KS 67205 | Oil Operator | Jul 2024 |
| 279 | Scheck Oil Operation | | Oil & Gas Operator | Dec 2025 |
| 280 | Schlobohm, Starr F. | Wolfeboro, NH 03894 | Oil Operator | Jul 2004 |
| 281 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 282 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Dec 2025 |
| 283 | Shields Oil Producers Inc. | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 284 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 285 | Smoky Valley Res | | Oil & Gas Operator | Dec 1995 |
| 286 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 287 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 288 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 289 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 290 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 291 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Dec 2025 |
| 292 | Stull Oil LLC | Natoma, KS 67651 | Oil Operator | Dec 2025 |
| 293 | Sunoco Partners Marketing | | Oil Operator | Apr 2023 |
| 294 | T & C MFG. & Operating, Inc. | Great Bend, KS 67530 | Oil Operator | May 2022 |
| 295 | Te-Pe Oil & Gas | | Oil & Gas Operator | Dec 2025 |
| 296 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 297 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 298 | Terrol Energy Incorporated | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 299 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 300 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |