| 201 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2024 |
| 202 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 203 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 204 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Jan 2025 |
| 205 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 206 | Amsito Production Company LLC | | Oil & Gas Operator | Jul 2005 |
| 207 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 208 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Jan 2025 |
| 209 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 210 | An-Son Transporation | Oklahoma City, OK 73136 | Oil & Gas Operator | Nov 2006 |
| 211 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 212 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 213 | Anadarko Disposal | El Reno, OK 73036 | Oil & Gas Operator | Jun 2014 |
| 214 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 215 | Anadarko Gathering Co. | Houston, TX 77251 | Oil & Gas Operator | Jul 2001 |
| 216 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 217 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Feb 2025 |
| 218 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 219 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 220 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jan 2025 |
| 221 | Anchorage Oil & Gas Inc | Oklahoma City, OK 73128-1422 | Oil & Gas Operator | Oct 1999 |
| 222 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 223 | Ancova Energy Marketing LLC | Oklahoma City, OK 73103 | Oil & Gas Operator | Jan 2025 |
| 224 | Andco Mud Inc | Edmond, OK 73034-3910 | Oil & Gas Operator | Mar 2006 |
| 225 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Oct 2024 |
| 226 | Anderson Jerry W | Bartlesville, OK 74006-0178 | Oil Operator | Dec 2022 |
| 227 | Anderson Mary L | | Oil & Gas Operator | Nov 1998 |
| 228 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 229 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 230 | Anderson Robert C Estate | San Diego, CA 92109 | Oil & Gas Operator | Jul 1994 |
| 231 | Anderson T Maxwell | Tulsa, OK 74136-0653 | Oil & Gas Operator | Dec 2013 |
| 232 | Anderson, Carl T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2014 |
| 233 | Andrea Operating Company | Edmond, OK 73013-6627 | Oil & Gas Operator | Jan 2025 |
| 234 | Andress Bill O | Tulsa, OK 74135-3553 | Oil & Gas Operator | Sep 2003 |
| 235 | Andrews Cable Tool Co | | Gas Operator | Nov 2000 |
| 236 | Angel Exploration Company | Oklahoma City, OK 73102-8868 | Oil & Gas Operator | Jan 2019 |
| 237 | Angel Exploration LLC | Oklahoma City, OK 73116-3603 | Oil & Gas Operator | Feb 2025 |
| 238 | Anjet Petroleum Company Inc | Gulfport, MS 39507-1301 | Oil & Gas Operator | Aug 2017 |
| 239 | Anr Pipeline Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 240 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 241 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 242 | Anson Charles Dba Anson Oil | Seminole, OK 74868 | Oil Operator | Jan 2025 |
| 243 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 244 | Anson J W | Seminole, OK 74818-1280 | Oil & Gas Operator | Oct 2020 |
| 245 | Anson Robert L & Teresa M | Seminole, OK 74868 | Oil & Gas Operator | Feb 2025 |
| 246 | Anstine & Musgrove Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2025 |
| 247 | Anstine-Musgrove Oil Company | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jan 2013 |
| 248 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 249 | Antares Energy Company | Houston, TX 77010 | Oil & Gas Operator | Apr 2025 |
| 250 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 251 | Antioch Disposal Well Inc | Duncan, OK 73533 | Oil Operator | Jan 1994 |
| 252 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2025 |
| 253 | Antlers Energy LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jan 2025 |
| 254 | Anvil Oil Co., Inc. | Bartlesville, OK 74003-5030 | Oil & Gas Operator | Dec 2008 |
| 255 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2025 |
| 256 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 257 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 258 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 259 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 260 | Apco Oil Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 1993 |
| 261 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2025 |
| 262 | Apex Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 1994 |
| 263 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Oct 2024 |
| 264 | Apogee Oil & Gas LLC | Edmond, OK 73034 | Oil Operator | Jan 2025 |
| 265 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Dec 2024 |
| 266 | Apple Petroleum Corp | Mountainside, NJ 7092 | Oil Operator | Mar 2013 |
| 267 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 268 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 269 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 270 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 271 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 272 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2025 |
| 273 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 274 | Arbor Petroleum Corporation | Oklahoma City, OK 73102-4003 | Oil & Gas Operator | Mar 2011 |
| 275 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jan 2025 |
| 276 | Arcadia Oil Company | Edmond, OK 73013-9009 | Oil & Gas Operator | Oct 2015 |
| 277 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 278 | Arcana Energy Corp Inc | Bartlesville, OK 74006 | Oil Operator | May 2017 |
| 279 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Apr 2025 |
| 280 | Archibald Oil & Gas Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Feb 2025 |
| 281 | Arco Pipe Line Company | Independence, KS 67301 | Oil & Gas Operator | Jun 1996 |
| 282 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Feb 2025 |
| 283 | Ardent Energy LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 284 | Ardmore Production & Exploration Co | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2025 |
| 285 | Arena Resources Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 286 | Argali Resources | Dallas, TX 75206 | Oil & Gas Operator | Apr 2003 |
| 287 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 288 | Arica Energy Company | Beggs, OK 74421 | Oil Operator | Jun 1994 |
| 289 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 290 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 291 | Arkana Operating Company Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 292 | Arkansas-Oklahoma Gas Corp | Fort Smith, AR 72917 | Oil & Gas Operator | Aug 2022 |
| 293 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 294 | Arkoma Gas Company | Edmond, OK 73003-5672 | Gas Operator | Apr 2010 |
| 295 | Arkoma Holding Corporation | Oklahoma City, OK 73102-5684 | Gas Operator | Jul 2007 |
| 296 | Arkoma Operations LLC | Tulsa, OK 74114-3502 | Oil & Gas Operator | Jan 2025 |
| 297 | Arkoma Production Company | Shreveport, LA 71101 | Gas Operator | Apr 2020 |
| 298 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 299 | Arm Energy Management LLC | Houston, TX 77070 | Oil & Gas Operator | Jan 2025 |
| 300 | Armor Energy II LLC | Tulsa, OK 74145 | Oil & Gas Operator | Feb 2025 |