| 201 | Natural Capital LLC | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2009 |
| 202 | New Donna Lee Oil Company | Bakersfield, CA 93308 | Oil & Gas Operator | Jul 2025 |
| 203 | Numac LLC | Cherryvale, KS 67335 | Oil Operator | Jun 2025 |
| 204 | Oil Lift Inc | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 205 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 206 | Oryx Energy Comp | | Oil & Gas Operator | Apr 1991 |
| 207 | Padgett Oil Inc. | Sedan, KS 67361 | Oil Operator | May 2006 |
| 208 | Peak Energy LLC | Coffeyville, KS 67337 | Oil & Gas Operator | Sep 2025 |
| 209 | Peterland Oil Co | | Oil Operator | Sep 1990 |
| 210 | Petro 85 Incorpo | | Oil Operator | Mar 1993 |
| 211 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 212 | Pipeline Oil & Gas, LLC | Phoenix, AZ 85016 | Oil Operator | Feb 2014 |
| 213 | Pitman John | | Oil & Gas Operator | Jan 1992 |
| 214 | Pitman, John Douglas Revocable Trust | Oklahoma City, OK 73118 | Oil Operator | Dec 2019 |
| 215 | Pitman, John Estate (Deceased) | Oklahoma City, OK 73104 | Oil Operator | May 2000 |
| 216 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Dec 2025 |
| 217 | Potato Creek, L.L.C. | Edna, KS 67342 | Oil & Gas Operator | Sep 2025 |
| 218 | Prairie Energy C | | Oil Operator | Oct 1987 |
| 219 | Pride Energy Company, A General Partnership | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2021 |
| 220 | Prisum Ventures | | Oil & Gas Operator | Oct 1995 |
| 221 | Production Compa | | Oil Operator | Apr 1985 |
| 222 | Production Maintenance Service | | Oil & Gas Operator | Jun 2020 |
| 223 | Production Team | | Oil & Gas Operator | Sep 1991 |
| 224 | Pure Energy Prod | | Oil Operator | Sep 1992 |
| 225 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 226 | Quest Energy Service Inc. | Chanute, KS 66720 | Oil & Gas Operator | Jan 2009 |
| 227 | Ranger Oil & Gas, Inc. | Okay, OK 74446 | Oil Operator | Jan 2007 |
| 228 | Raygary Oil Co. | Havana, KS 67347 | Oil Operator | May 2002 |
| 229 | Raygary Oil Comp | | Oil Operator | Sep 1991 |
| 230 | RCR Drilling & P | | Oil & Gas Operator | Apr 1992 |
| 231 | Reata Petroleum LLC | Independence, KS 67301 | Oil & Gas Operator | Sep 2025 |
| 232 | Red Buck Oil Company | Copan, OK 74022-0215 | Oil Operator | Nov 2009 |
| 233 | Red Cloud Exploration Operating LLC | Calabasas, CA 91302 | Oil Operator | Feb 2016 |
| 234 | Red Jack Oil LLC | | Oil Operator | May 2013 |
| 235 | Redbud Oil & Gas Operating, LLC | Spring, TX 77379 | Oil & Gas Operator | Sep 2025 |
| 236 | Rice Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2020 |
| 237 | Richey Heartsill | | Oil Operator | Feb 1991 |
| 238 | Rick'S Well Service | Cherryvale, KS 67335 | Oil & Gas Operator | Apr 2023 |
| 239 | River Rock Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 240 | Roadrunner Energy | | Oil Operator | Sep 2005 |
| 241 | Robertson, Richard | Tulsa, OK 74127 | Gas Operator | Sep 2025 |
| 242 | Rock Petroleum, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 243 | Rockin Bar Nothin Ranch, Inc. | Independence, KS 67301 | Oil Operator | Sep 2025 |
| 244 | Rolfe & Rolfe Oi | | Oil Operator | May 1988 |
| 245 | Royal Energy, Inc. | Dodge City, KS 67801 | Oil Operator | Dec 2019 |
| 246 | Rushmore & Tresn | | Oil Operator | Jan 1995 |
| 247 | S & J Operating | | Oil Operator | May 1989 |
| 248 | S & T Oil Compan | | Oil Operator | Feb 1984 |
| 249 | S C Z Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 250 | Sand Bar Oil Com | | Oil Operator | Jun 1986 |
| 251 | Sand Dollar Ener | | Oil Operator | Aug 1984 |
| 252 | Sandefer Larry | | Oil Operator | Aug 1993 |
| 253 | Schuetz, Edna, Ed & Ronald(Deceased) | Coffeyville, KS 67337 | Oil Operator | Nov 2011 |
| 254 | Sek Oil Incorpor | | Oil Operator | Jun 1985 |
| 255 | Serendipity Production Company LC | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2020 |
| 256 | Shearhart, Gary L. | Havana, KS 67347 | Oil Operator | Oct 2001 |
| 257 | Shorts Production LLC | Havana, KS 67347 | Oil Operator | Sep 2025 |
| 258 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 259 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 260 | Steinberger Oil Company | Independence, KS 67301 | Oil & Gas Operator | May 2002 |
| 261 | Stekoll Petroleu | | Oil Operator | Oct 1985 |
| 262 | Sterling Explora | | Oil & Gas Operator | Jun 1994 |
| 263 | Stoeppelwerth DR | | Oil Operator | May 1993 |
| 264 | Stonegate Ranch LLC | Caney, KS 67333 | Oil Operator | Sep 2025 |
| 265 | Stoudt, Jean Marie | Broken Arrow, OK 74011 | Oil Operator | May 2025 |
| 266 | Streamline Energy, LLC | Yates Center, KS 66783 | Oil & Gas Operator | Dec 2019 |
| 267 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 268 | Suerte Oil & Gas LLC | Caney, KS 67333 | Oil Operator | Sep 2025 |
| 269 | Sun Ventures | Bartlesville, OK 74003 | Oil Operator | Feb 1997 |
| 270 | T & C Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 271 | Taft Oil And Gas LLC | Bonham, TX 75418 | Oil & Gas Operator | Dec 2018 |
| 272 | Tehi Illinois, LLC | Olney, IL 62450 | Oil & Gas Operator | Feb 2019 |
| 273 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 274 | The Raven Company LLC | Granbury, TX 76049 | Oil Operator | Mar 2010 |
| 275 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 276 | Tonda Oil Company | Independence, KS 67301 | Oil & Gas Operator | Jul 1996 |
| 277 | TR Crude LLC | Independence, KS 67301 | Oil Operator | Aug 2024 |
| 278 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 279 | Triple J L.L.C. | Coffeyville, KS 67336 | Oil Operator | Mar 1999 |
| 280 | Triple-T Pipelin | | Oil & Gas Operator | Oct 1995 |
| 281 | Troy Resources C | | Oil Operator | Jun 1990 |
| 282 | Tucker, Carl H., Jr. | Independence, KS 67301 | Oil Operator | Jul 1996 |
| 283 | Twinoco | Caney, KS 67333 | Oil Operator | Nov 1996 |
| 284 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 285 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 286 | Tyco, Inc. (Colorado Corporation) | Independence, KS 67301 | Gas Operator | Jun 1998 |
| 287 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 288 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 289 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 290 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 291 | United Oil & Gas | | Oil Operator | Feb 1988 |
| 292 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Apr 2007 |
| 293 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 294 | Uranus, Inc. | Kansas City, MO 64112 | Oil Operator | Jan 2000 |
| 295 | Usx Operating Co., Inc. | Barnstall, OK 74002 | Oil & Gas Operator | Apr 2017 |
| 296 | Vci Production | Jarales, NM 87023 | Oil Operator | Jan 1997 |
| 297 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2026 |
| 298 | Verde Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2025 |
| 299 | Verdigris Energy | | Gas Operator | Jun 1983 |
| 300 | W.R.A. Oil Co. | | Oil & Gas Operator | Mar 2025 |