| 201 | Argent Energy In | | Oil Operator | Feb 1994 |
| 202 | Argent Energy, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 203 | Argonaut Energy | | Oil & Gas Operator | Aug 1991 |
| 204 | Aries Operating, LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 205 | Arizona Oil Comp | | Oil Operator | Oct 1984 |
| 206 | Arlian, Inc. | Denver, CO 80202 | Oil Operator | Feb 1998 |
| 207 | Armada Operating, LLC | Dallas, TX 75254 | Oil Operator | Aug 2015 |
| 208 | Armadilla Oil & Gas, LLC | Madison, KS 66860 | Oil Operator | Jun 2025 |
| 209 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 210 | Armstrong & Jack | | Gas Operator | Jun 1997 |
| 211 | Arnold Prodn. | | Oil & Gas Operator | Jan 2006 |
| 212 | Arp Operating, LLC | Denver, CO 80202 | Oil Operator | Jun 2025 |
| 213 | Arps Petroleum C | | Oil Operator | Jul 1987 |
| 214 | Arrow Oil & Gas, Inc. | Norman, OK 73070 | Oil Operator | Mar 2010 |
| 215 | Arrow Oil Operat | | Oil Operator | Nov 1991 |
| 216 | Arrow Production Company | Tulsa, OK 74108 | Oil & Gas Operator | Dec 2009 |
| 217 | Arrowhead Exploration, LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 218 | Arrowhead Petrol | | Oil & Gas Operator | Feb 1992 |
| 219 | Arrowhead Petroleum Of Kansas, Inc. | Wellington, KS 67152 | Oil & Gas Operator | Oct 2004 |
| 220 | Arroyo Petroleum | Wichita, KS 67205 | Oil Operator | Mar 2001 |
| 221 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 222 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 223 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 224 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 225 | Asher Associates Inc | Centennial, CO 80112 | Oil & Gas Operator | Aug 2016 |
| 226 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 227 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Jun 2025 |
| 228 | Ashlock True | | Oil Operator | Nov 1987 |
| 229 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 230 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 231 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 232 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 233 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 234 | Associated Oil & | | Oil Operator | Mar 1986 |
| 235 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 236 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 237 | Atlantis Oil Cor | | Oil Operator | Sep 1989 |
| 238 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 239 | Attica Gas Ventu | | Oil & Gas Operator | Dec 1995 |
| 240 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 241 | Austin Robert L | Stafford, KS 67578 | Oil & Gas Operator | Dec 1999 |
| 242 | Austin, John F. | Baton Rouge, LA 70879 | Oil Operator | May 1992 |
| 243 | Austin, Robert E. | Miami, OK 74354 | Oil Operator | Dec 1995 |
| 244 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2025 |
| 245 | Axem Resources I | | Oil Operator | Aug 1995 |
| 246 | Aylward Drilling | | Oil & Gas Operator | Dec 1986 |
| 247 | Azkan Oil & Gas LLC | | Oil Operator | Jul 2024 |
| 248 | Aztec Oil Operating LLC | El Dorado, KS 67042 | Oil & Gas Operator | Jun 2025 |
| 249 | B & B Drilling Co. | Milano, TX 76556 | Oil & Gas Operator | Jul 2015 |
| 250 | B & B Farm Industries, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2002 |
| 251 | B & B Oil | Lyons, KS 67554 | Oil Operator | Mar 2025 |
| 252 | B & B Oil % Willie Booth | El Dorado, KS 67042 | Oil Operator | Oct 2001 |
| 253 | B & B Oil Compan | | Oil & Gas Operator | Jul 1992 |
| 254 | B & B Oil Company | Corsicana, TX 75110 | Oil & Gas Operator | Jun 2025 |
| 255 | B & B Oil Recovery | | Oil Operator | Jun 2025 |
| 256 | B & B Oil, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 257 | B & B Oil, LLC | Havana, KS 67347 | Oil Operator | Jun 2025 |
| 258 | B & C Oil, A General Partnership | Erie, KS 66733 | Oil Operator | Nov 1999 |
| 259 | B & D Oil, LLC | Welda, KS 66091 | Oil Operator | May 2025 |
| 260 | B & G Oil Compan | | Oil Operator | Aug 1994 |
| 261 | B & H Drilling, A General Partnership | Moline, KS 67353 | Oil Operator | Nov 2009 |
| 262 | B & J Developers | | Oil Operator | Oct 1995 |
| 263 | B & L | | Oil Operator | Apr 2016 |
| 264 | B & L Oil | Sardis, OH 43946 | Oil & Gas Operator | Jun 2025 |
| 265 | B & L Oil Compan | | Oil Operator | Jun 1988 |
| 266 | B & M Oil Co.. A General Partner | Eldorado, KS 67042 | Oil Operator | Jun 2025 |
| 267 | B & N Gas Company, LLC | Marion, KS 66861 | Gas Operator | Dec 2023 |
| 268 | B & N Oil, LLC | | Oil Operator | Jun 2025 |
| 269 | B & S Oil | | Oil Operator | Jun 2008 |
| 270 | B & W Oil Inc. | Wellington, KS 67152 | Oil Operator | Apr 2000 |
| 271 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Dec 2025 |
| 272 | B E C Oil Compan | | Oil Operator | May 1986 |
| 273 | B J Oil Company | Corsicana, TX 75109 | Oil & Gas Operator | Dec 2025 |
| 274 | B M & S Oil | | Oil Operator | Apr 1986 |
| 275 | B S &B Oil & Gas | | Oil Operator | Dec 1992 |
| 276 | B-C Steel, LLC | Yates Center, KS 66783 | Oil & Gas Operator | Nov 2015 |
| 277 | B-F Oil Co. L.L.C. | Great Bend, KS 67530 | Oil Operator | Jun 2025 |
| 278 | B-P Ent. | Arlington, TX 76015 | Oil Operator | Jul 1996 |
| 279 | B5 Operating, LLC | Wellington, KS 67152 | Oil & Gas Operator | Jun 2025 |
| 280 | B8 Investments | | Oil Operator | Jun 2025 |
| 281 | Baber Oil Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 282 | Bach Oil Production | | Oil Operator | Jun 2025 |
| 283 | Backa LLC | Arkansas City, KS 67005 | Oil Operator | Jun 2025 |
| 284 | Bailey Boy Oil | | Oil Operator | Jun 2025 |
| 285 | Bailey Oil Co., Inc. | Neodesha, KS 66757 | Oil Operator | Dec 2009 |
| 286 | Bailey Sharon | Centerville, KS 66014 | Oil Operator | Sep 1997 |
| 287 | Bailey, Albian W., Jr. | Neodesha, KS 66757 | Oil Operator | Nov 2009 |
| 288 | Bailey, Gene M. | Neodesha, KS 66757 | Oil Operator | Nov 2009 |
| 289 | Bair, Orville L. | Burden, KS 67019 | Oil & Gas Operator | Oct 2003 |
| 290 | Baird Oil Company Inc | Lewisville, TX 75067 | Oil & Gas Operator | Dec 2025 |
| 291 | Baird Oil Company LLC | Logan, KS 67646 | Oil Operator | Jun 2025 |
| 292 | Baker Eberle Energy Corp | Blackwell, OK 74631 | Oil & Gas Operator | Mar 2015 |
| 293 | Baker Oil Incorp | | Oil Operator | Oct 1985 |
| 294 | Bale Charles R | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2014 |
| 295 | Ball, D. A. | El Dorado, KS 67042 | Oil Operator | Dec 2000 |
| 296 | Ballard Lance E | | Oil Operator | Dec 1993 |
| 297 | Ballou Energy | | Oil Operator | Jun 2025 |
| 298 | Ballou Oil Well | | Oil Operator | Mar 1995 |
| 299 | Ballou Oil Well Service | | Oil Operator | Jun 2025 |
| 300 | Bancroft Oil LLC | Chanute, KS 66720 | Oil Operator | May 2025 |