| 1401 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 1402 | Armour, Widd | Graham, TX 76450 | Oil & Gas Operator | May 2026 |
| 1403 | Armstrong Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2026 |
| 1404 | Armstrong Gas Co LLC | Kittanning, PA 16201-2269 | Oil & Gas Operator | Dec 2018 |
| 1405 | Armstrong Oil Inc. | | Oil & Gas Operator | Dec 2020 |
| 1406 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Feb 2026 |
| 1407 | Armstrong Petroleum Corporation | | Oil & Gas Operator | Dec 2025 |
| 1408 | Armstrong Robert D | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 1409 | Arnaudville Company Inc. | | Oil & Gas Operator | Apr 1995 |
| 1410 | Arnell Oil Company | Centennial, CO 80122 | Oil & Gas Operator | Sep 2025 |
| 1411 | Arnett Saltwater Disposal LLC | Shattuck, OK 73858-0848 | Oil Operator | Dec 2021 |
| 1412 | Arnold & Assoc-D&D-Coquina | | Oil Operator | Oct 1985 |
| 1413 | Arnold N Krebbs | | Oil Operator | Feb 2026 |
| 1414 | Arnold Oil Properties, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2019 |
| 1415 | Arnold Oil Properties, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2026 |
| 1416 | Arnold Prodn. | | Oil & Gas Operator | Jan 2006 |
| 1417 | Arnold Ridge LLC | | Oil Operator | Dec 2023 |
| 1418 | Arnot Oil Company, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | May 2026 |
| 1419 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 1420 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 1421 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 1422 | Arp Oklahoma LLC | Fort Worth, TX 76102-7426 | Oil & Gas Operator | Feb 2020 |
| 1423 | Arp Operating, LLC | Denver, CO 80202 | Oil Operator | Dec 2025 |
| 1424 | Arp Production Company, LLC | Fort Worth, TX 76102 | Gas Operator | Feb 2026 |
| 1425 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 1426 | Arps Petroleum C | | Oil Operator | Jul 1987 |
| 1427 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 1428 | Arrco Operating, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2026 |
| 1429 | Arrington CJM, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Nov 2021 |
| 1430 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 1431 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 1432 | Arrington Production Company | Pampa, TX 79066 | Oil & Gas Operator | May 2026 |
| 1433 | Arrington Properties Inc | Edmond, OK 73034-3724 | Oil & Gas Operator | May 1996 |
| 1434 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 1435 | Arriola Operating & Consltg Inc. | Dallas, TX 75248 | Oil Operator | May 2026 |
| 1436 | Arris Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2016 |
| 1437 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Feb 2026 |
| 1438 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 1439 | Arrow Oil & Gas, Inc. | Norman, OK 73070 | Oil Operator | Mar 2010 |
| 1440 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | May 2026 |
| 1441 | Arrow Oil Operat | | Oil Operator | Nov 1991 |
| 1442 | Arrow Operating Company | Dallas, TX 75231 | Oil & Gas Operator | Jan 2026 |
| 1443 | Arrow Production Company | Tulsa, OK 74108 | Oil & Gas Operator | Dec 2009 |
| 1444 | Arrow Rock Energy, LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2018 |
| 1445 | Arrow S Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 1446 | Arrowhead Energy Exp., LLC | Baton Rouge, LA 70816 | Oil & Gas Operator | Nov 2006 |
| 1447 | Arrowhead Energy Expl, LLC | | Oil & Gas Operator | May 2013 |
| 1448 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 1449 | Arrowhead Enterprises, Inc. | Baton Rouge, LA 70816 | Oil & Gas Operator | Apr 2001 |
| 1450 | Arrowhead Exploration Company | Olney, TX 76374 | Oil Operator | Dec 1995 |
| 1451 | Arrowhead Exploration, LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 1452 | Arrowhead Gas Producers Inc | Olean, NY 14760-3355 | Gas Operator | Dec 1992 |
| 1453 | Arrowhead Industries | Horse Cave, KY 42749 | Oil Operator | Dec 2011 |
| 1454 | Arrowhead Oil & Gas Co | Gambier, OH 43022 | Oil & Gas Operator | Dec 2010 |
| 1455 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | May 2026 |
| 1456 | Arrowhead Petrol | | Oil & Gas Operator | Feb 1992 |
| 1457 | Arrowhead Petroleum Of Kansas, Inc. | Wellington, KS 67152 | Oil & Gas Operator | Oct 2004 |
| 1458 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | May 2026 |
| 1459 | Arrowhead Resources USA LTD | | Oil & Gas Operator | Dec 1992 |
| 1460 | Arrowhead Resources, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 1461 | Arrowood Production Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2008 |
| 1462 | Arroyo Petroleum | Wichita, KS 67205 | Oil Operator | Mar 2001 |
| 1463 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 1464 | Arsenal Resources LLC | Wexford, PA 15090 | Oil & Gas Operator | Dec 2021 |
| 1465 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 1466 | Artex Energy Group LLC | Marietta, OH 45750-5362 | Oil & Gas Operator | Jun 2022 |
| 1467 | Artex Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 1468 | Arthur Arnold | | Oil Operator | Dec 1991 |
| 1469 | Arthur J. Arding Jr. | | Gas Operator | Dec 1995 |
| 1470 | Arthur McAdams | | Oil & Gas Operator | Dec 2025 |
| 1471 | Artra Resources Corp. | | Oil & Gas Operator | Sep 1990 |
| 1472 | Artzberger-Johnson | | Oil & Gas Operator | Mar 1978 |
| 1473 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Jan 2026 |
| 1474 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 1475 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 1476 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 1477 | Ary, J. Kirk | Midland, TX 79708 | Oil & Gas Operator | Jun 1993 |
| 1478 | Arya Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 1479 | Arzie, Gerald & Judith And Barankovich, Ronald | Pulaski, NY 13142 | Gas Operator | Dec 2024 |
| 1480 | Asa Energy Corp | | Oil & Gas Operator | Jun 1984 |
| 1481 | Asa Oil & Gas, Inc. | Brady, TX 76825 | Oil & Gas Operator | May 2026 |
| 1482 | Asamera Oil Us Inc | Denver, CO 80201 | Oil & Gas Operator | Jul 1985 |
| 1483 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | May 2026 |
| 1484 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 1485 | Ascent Energy, LLC. | Parker, CO 80134 | Oil & Gas Operator | Jul 2023 |
| 1486 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 1487 | Ascent Resources - Marcellus, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2021 |
| 1488 | Ascent Resources Utica LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 1489 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 1490 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 1491 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 1492 | Ash Exploration, Inc. | | Oil & Gas Operator | Apr 2010 |
| 1493 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 1494 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 1495 | Ashbrook Oil Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 1496 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 1497 | Ashcraft James C | Frazeysburg, OH 43822 | Oil Operator | Dec 1997 |
| 1498 | Ashe Oil Company | Scio, NY 14880 | Oil Operator | Dec 2024 |
| 1499 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 1500 | Asher Associates Inc | Centennial, CO 80112 | Oil & Gas Operator | Aug 2016 |