| 301 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 302 | Arrington CJM, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Nov 2021 |
| 303 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 304 | Arrington Properties Inc | Edmond, OK 73034-3724 | Oil & Gas Operator | May 1996 |
| 305 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Nov 2025 |
| 306 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 2025 |
| 307 | Arrow Operating Company | Dallas, TX 75231 | Oil & Gas Operator | Nov 2025 |
| 308 | Arrow Production Company | Tulsa, OK 74108 | Oil & Gas Operator | Dec 2009 |
| 309 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 310 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Dec 2025 |
| 311 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Oct 2025 |
| 312 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 313 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 314 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 315 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 316 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Jun 2025 |
| 317 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 318 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 319 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 320 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 321 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 322 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Nov 2025 |
| 323 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 324 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 325 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 326 | Astro Energy Corporation | Edmond, OK 73083-3607 | Oil & Gas Operator | Sep 2014 |
| 327 | Atalaya Resources LLC | Tulsa, OK 74103-4361 | Oil & Gas Operator | Dec 2022 |
| 328 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2025 |
| 329 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 330 | Athan Inc | Edmond, OK 73013-6628 | Oil & Gas Operator | Nov 2025 |
| 331 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Dec 2025 |
| 332 | Atkinson J V | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 333 | Atkinson WM H Estate | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2001 |
| 334 | Atlanko Oil & Gas Inc | Tulsa, OK 74135-7846 | Oil & Gas Operator | Oct 2025 |
| 335 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 336 | Atlas Oil Inc | Oklahoma City, OK 73154-0467 | Oil & Gas Operator | Aug 2008 |
| 337 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 338 | Atls Production Company LLC | Fort Worth, TX 76102-7426 | Gas Operator | Sep 2020 |
| 339 | Atteberry Engineering | Edmond, OK 73013-6624 | Oil & Gas Operator | Mar 2008 |
| 340 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 341 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 342 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 343 | Austin Robert L | Stafford, KS 67578 | Oil & Gas Operator | Dec 1999 |
| 344 | Autumn Exploration LTD | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2015 |
| 345 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2025 |
| 346 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 347 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Oct 2025 |
| 348 | Avant Jack E | Skiatook, OK 74070 | Oil Operator | Jan 2013 |
| 349 | Avatar Energy LLC | Dallas, TX 75220-2230 | Oil & Gas Operator | Jul 2016 |
| 350 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 351 | Avers Harvey G Energy Expl | | Oil & Gas Operator | May 2013 |
| 352 | Avondale Operating Co | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2019 |
| 353 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 354 | Aw Hembree Co | Shawnee, OK 74802-1725 | Oil & Gas Operator | Oct 2025 |
| 355 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 356 | Axeon Energy Operations LLC | Evergreen, CO 80439-7624 | Oil Operator | Jul 2015 |
| 357 | Axia Energy III LLC | Highlands Ranch, CO 80129 | Oil & Gas Operator | Sep 2025 |
| 358 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Dec 2025 |
| 359 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |
| 360 | Ayers Energy, Inc. | Oklahoma City, OK 73177 | Oil & Gas Operator | Dec 1995 |
| 361 | Ayluma Operating Inc | Dewar, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 362 | Azar Marsha | Chicago, IL 60618 | Oil Operator | Jan 2025 |
| 363 | Aztec Exploration Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2013 |
| 364 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Nov 2025 |
| 365 | B & B #1 LLC | Chandler, OK 74834 | Oil & Gas Operator | Oct 2025 |
| 366 | B & B Oil | Lyons, KS 67554 | Oil Operator | Oct 2025 |
| 367 | B & B Operating Company | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 368 | B & B Resources | Tulsa, OK 74136-2655 | Oil & Gas Operator | Dec 2024 |
| 369 | B & B Resources Inc | Somerset, KY 42501 | Oil & Gas Operator | Dec 2019 |
| 370 | B & B SWD LLC | Kingfisher, OK 73750 | Oil Operator | Nov 2025 |
| 371 | B & B Tool Company Inc | Lindsay, OK 73052 | Oil & Gas Operator | Oct 2025 |
| 372 | B & C Drilling Company Inc | Holdenville, OK 74848-0961 | Oil & Gas Operator | Mar 2000 |
| 373 | B & D Oil Inc | Bristow, OK 74010-2801 | Oil & Gas Operator | Feb 2017 |
| 374 | B & F Enterprises | Ada, OK 74820 | Oil & Gas Operator | Feb 2002 |
| 375 | B & G Oil & Gas Co | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2000 |
| 376 | B & H Exploration Company | Talala, OK 74080 | Oil & Gas Operator | Dec 2000 |
| 377 | B & H Oil Company | Oklahoma City, OK 73108 | Oil & Gas Operator | Jan 2025 |
| 378 | B & J Developers Inc | Bartlesville, OK 74006-3403 | Oil & Gas Operator | Feb 2020 |
| 379 | B & K Partnership | Burleson, TX 76028 | Oil Operator | Aug 2025 |
| 380 | B & M Oil & Gas LLC | Bartlesville, OK 74006-5702 | Oil Operator | Oct 2025 |
| 381 | B & O Drilling Inc | Ada, OK 74820-8065 | Oil & Gas Operator | Sep 2014 |
| 382 | B & P Oil & Gas | Oilton, OK 74052-0296 | Oil & Gas Operator | Dec 2021 |
| 383 | B & R Oil | Holdenville, OK 74848-4634 | Oil Operator | Mar 2015 |
| 384 | B & R Production LLC | Paden, OK 74860 | Oil & Gas Operator | May 2025 |
| 385 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 386 | B & S Oil LLC | Cement, OK 73017-9506 | Oil Operator | Oct 2025 |
| 387 | B & S Production | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2009 |
| 388 | B & S Resources LLC | Choctaw, OK 73020 | Oil Operator | Oct 2025 |
| 389 | B & W Operating, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 390 | B & W Production | Bristow, OK 74010 | Oil Operator | May 1994 |
| 391 | B And G Production, Inc. | Woodward, OK 73801 | Oil & Gas Operator | Dec 2025 |
| 392 | B And M Production | Burkburnett, TX 76354 | Oil Operator | Dec 2025 |
| 393 | B B & B Oil Co | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2014 |
| 394 | B B R Oil Corporation | Norman, OK 73069 | Oil & Gas Operator | Oct 2025 |
| 395 | B H & T Oil Company Inc | Purcell, OK 73080-3010 | Oil & Gas Operator | Dec 2000 |
| 396 | B M Energy, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2022 |
| 397 | B P Energy | | Oil & Gas Operator | Apr 2015 |
| 398 | B R Polk Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 399 | B R Smith Disposal Co | | Oil & Gas Operator | Jun 2021 |
| 400 | B-J Enterprises Inc | McAlester, OK 74501-7335 | Oil & Gas Operator | Apr 2014 |