| 201 | Petroleum Corpor | | Oil Operator | Jan 1983 |
| 202 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 203 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 204 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Mar 2026 |
| 205 | Petropro Petroleum LLC | | Oil Operator | Sep 2025 |
| 206 | Phillips Exploration Company L.C. | Andover, KS 67002 | Oil & Gas Operator | Sep 2025 |
| 207 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 208 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Sep 2025 |
| 209 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 210 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 211 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 212 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 213 | Pratt, Don E. | Hays, KS 67601 | Oil Operator | Dec 1999 |
| 214 | Production Drill | | Oil Operator | Oct 1994 |
| 215 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 216 | Quinn Oil Produc | | Oil Operator | Dec 1987 |
| 217 | R. P. Nixon Operations, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 218 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 219 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Sep 2025 |
| 220 | Reach Group-Reac | | Oil & Gas Operator | Apr 1995 |
| 221 | Reach Petroleum | | Oil & Gas Operator | Jan 1994 |
| 222 | Reddig Enterprises Inc. | Gorham, KS 67640 | Oil Operator | Aug 2025 |
| 223 | Reilly Oil Company, Inc. | Wakeeney, KS 67672 | Oil Operator | Sep 2025 |
| 224 | Reilly Oil E & P | | Oil Operator | Sep 2025 |
| 225 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 226 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 227 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 228 | RL Investment, LLC | Hill City, KS 67642 | Oil Operator | Sep 2025 |
| 229 | Robert Hopkins Operations, LLC | Salina, KS 67401 | Oil Operator | Nov 2019 |
| 230 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 231 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 232 | Russell Oil, Inc. | Edmond, OK 73083 | Oil Operator | Sep 2025 |
| 233 | S & W Oil & Gas, LLC | Pampa, TX 79066 | Oil & Gas Operator | Mar 2026 |
| 234 | Sabre Exploratio | | Oil Operator | Oct 1988 |
| 235 | Samson Properties, Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2008 |
| 236 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 237 | San Saba Energy | Hays, KS 67601 | Oil Operator | May 1998 |
| 238 | Schmitt Carmen I | | Oil Operator | Dec 1996 |
| 239 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Sep 2025 |
| 240 | Shields Oil Prod | | Oil & Gas Operator | Aug 1995 |
| 241 | Shields Oil Producers Inc. | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 242 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 243 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 244 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 245 | Spines Explorati | | Oil & Gas Operator | Dec 1990 |
| 246 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 247 | Staab Energy & Leasing | | Oil Operator | Sep 2025 |
| 248 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 249 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 250 | Stauffer Oil & G | | Oil Operator | Jun 1987 |
| 251 | Strata Energy Re | | Oil Operator | Nov 1987 |
| 252 | Stull Oil LLC | Natoma, KS 67651 | Oil Operator | Sep 2025 |
| 253 | Sunburst Explora | | Oil Operator | May 1990 |
| 254 | Swenco-Western I | | Oil Operator | Sep 1987 |
| 255 | T & D Oil Compan | | Oil Operator | Jan 1992 |
| 256 | Te-Pe Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 257 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Sep 2025 |
| 258 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 259 | Terrol Energy In | | Oil Operator | Feb 1993 |
| 260 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |
| 261 | Texkan Resources, LLC | Odessa, TX 79765 | Oil & Gas Operator | Jun 2025 |
| 262 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Sep 2025 |
| 263 | Thoroughbred Associates LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 264 | Thunderbird Dril | | Oil & Gas Operator | Nov 1995 |
| 265 | Tomlinson Operating, LLC | Ketchum, ID 83340 | Oil & Gas Operator | Oct 2014 |
| 266 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2026 |
| 267 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 268 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Mar 2026 |
| 269 | Tri United, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 270 | Triple 'H' Oil O | | Oil Operator | Apr 1992 |
| 271 | Trumart Oil Comp | | Oil Operator | May 1990 |
| 272 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 273 | Unrein Oil Co | | Oil Operator | Sep 2025 |
| 274 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 275 | Venture Oil Comp | | Oil Operator | Aug 1988 |
| 276 | Venture Resources, Inc. | Denver, CO 80250 | Oil Operator | Sep 2025 |
| 277 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Mar 2026 |
| 278 | Viking Resources | | Oil & Gas Operator | Sep 1995 |
| 279 | Viking Resources, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Mar 2026 |
| 280 | Vintage Petroleu | | Oil & Gas Operator | Dec 1995 |
| 281 | Volga Oil Incorp | | Oil Operator | Sep 1990 |
| 282 | Vonfeldt Oil Ope | | Oil Operator | Oct 1994 |
| 283 | Wausau Development Corporation | Laurel, MS 39440 | Oil & Gas Operator | Sep 2019 |
| 284 | Western Kansas E | | Oil Operator | Aug 1993 |
| 285 | Whitetail Crude Inc | Ness City, KS 67560 | Oil & Gas Operator | Sep 2025 |
| 286 | Wick'S Petroleum | | Oil Operator | Aug 1983 |
| 287 | Williams, Paul H. | Plainville, KS 67663 | Oil Operator | Mar 1987 |
| 288 | Wilton Petroleum, Inc. | Canton, KS 67428 | Oil & Gas Operator | Sep 2025 |
| 289 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 290 | Woodman & Iannitti Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Jan 2003 |
| 291 | Younger Energy C | | Oil & Gas Operator | Dec 1996 |
| 292 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 293 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 294 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 295 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |