| 1301 | Arrowhead Oil & Gas Co | Gambier, OH 43022 | Oil & Gas Operator | Dec 2010 |
| 1302 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | May 2026 |
| 1303 | Arrowhead Petrol | | Oil & Gas Operator | Feb 1992 |
| 1304 | Arrowhead Petroleum Of Kansas, Inc. | Wellington, KS 67152 | Oil & Gas Operator | Oct 2004 |
| 1305 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | May 2026 |
| 1306 | Arrowhead Resources USA LTD | | Oil & Gas Operator | Dec 1992 |
| 1307 | Arrowhead Resources, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 1308 | Arrowood Production Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2008 |
| 1309 | Arroyo Petroleum | Wichita, KS 67205 | Oil Operator | Mar 2001 |
| 1310 | Arsenal Energy USA Inc. | | Oil & Gas Operator | Aug 2016 |
| 1311 | Arsenal Resources LLC | Wexford, PA 15090 | Oil & Gas Operator | Dec 2021 |
| 1312 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 1313 | Artex Energy Group LLC | Marietta, OH 45750-5362 | Oil & Gas Operator | Jun 2022 |
| 1314 | Artex Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 1315 | Arthur Arnold | | Oil Operator | Dec 1991 |
| 1316 | Arthur J. Arding Jr. | | Gas Operator | Dec 1995 |
| 1317 | Arthur McAdams | | Oil & Gas Operator | Dec 2025 |
| 1318 | Artra Resources Corp. | | Oil & Gas Operator | Sep 1990 |
| 1319 | Artzberger-Johnson | | Oil & Gas Operator | Mar 1978 |
| 1320 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Jan 2026 |
| 1321 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 1322 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 1323 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 1324 | Ary, J. Kirk | Midland, TX 79708 | Oil & Gas Operator | Jun 1993 |
| 1325 | Arya Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 1326 | Arzie, Gerald & Judith And Barankovich, Ronald | Pulaski, NY 13142 | Gas Operator | Dec 2024 |
| 1327 | Asa Energy Corp | | Oil & Gas Operator | Jun 1984 |
| 1328 | Asa Oil & Gas, Inc. | Brady, TX 76825 | Oil & Gas Operator | May 2026 |
| 1329 | Asamera Oil Us Inc | Denver, CO 80201 | Oil & Gas Operator | Jul 1985 |
| 1330 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | May 2026 |
| 1331 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 1332 | Ascent Energy, LLC. | Parker, CO 80134 | Oil & Gas Operator | Jul 2023 |
| 1333 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 1334 | Ascent Resources - Marcellus, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2021 |
| 1335 | Ascent Resources Utica LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 1336 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 1337 | Asg Holdings LLC | Colorado Springs, CO 80907 | Oil Operator | Nov 2009 |
| 1338 | Ash Donald D Oil | | Oil & Gas Operator | Feb 1986 |
| 1339 | Ash Exploration, Inc. | | Oil & Gas Operator | Apr 2010 |
| 1340 | Ash, Wiley R., Jr. | Andover, KS 67002 | Oil & Gas Operator | Mar 1990 |
| 1341 | Ash-Bie Oil Co | Ellis, KS 67637 | Oil Operator | Nov 1998 |
| 1342 | Ashbrook Oil Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 1343 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 1344 | Ashcraft James C | Frazeysburg, OH 43822 | Oil Operator | Dec 1997 |
| 1345 | Ashe Oil Company | Scio, NY 14880 | Oil Operator | Dec 2024 |
| 1346 | Ashe Road Properties L.P. | | Oil & Gas Operator | Dec 2009 |
| 1347 | Asher Associates Inc | Centennial, CO 80112 | Oil & Gas Operator | Aug 2016 |
| 1348 | Asher Enterprises LTD. Co. | Denton, TX 76210 | Oil & Gas Operator | Nov 2023 |
| 1349 | Asher Oil Co | Artesia, NM 88210 | Oil & Gas Operator | Aug 1995 |
| 1350 | Asher Oil LLC | | Oil & Gas Operator | Jan 2026 |
| 1351 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 1352 | Asher Tip Corporation | Fairfax, OK 74637-0308 | Oil & Gas Operator | Nov 2003 |
| 1353 | Ashford, Jerry | Caney, KS 67333 | Oil Operator | Aug 1992 |
| 1354 | Ashland Exploration | | Oil & Gas Operator | May 1979 |
| 1355 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 1356 | Ashland Exploration Properties Inc | | Gas Operator | Dec 1996 |
| 1357 | Ashland Oil, Inc | | Oil & Gas Operator | Dec 2023 |
| 1358 | Ashlawn Corporation | | Oil & Gas Operator | Dec 2008 |
| 1359 | Ashlawn Energy, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1360 | Ashley Jim Company (The) | Broken Arrow, OK 74012 | Oil Operator | Jan 2026 |
| 1361 | Ashley Valley Operating Company LLC | Orem, UT 84097 | Oil & Gas Operator | Oct 2025 |
| 1362 | Ashlock Thomas J | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2015 |
| 1363 | Ashlock True | | Oil Operator | Nov 1987 |
| 1364 | Ashlock, Beryl Roderick | Virgil, KS 66870 | Oil Operator | Dec 2019 |
| 1365 | Ashlock, Edd | Neal, KS 66863 | Oil Operator | Dec 1986 |
| 1366 | Ashlock, Ernest H. | Overland Park, KS 66202 | Oil Operator | Jun 1987 |
| 1367 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | May 2026 |
| 1368 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 1369 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 1370 | Ashuca | | Oil Operator | Feb 1998 |
| 1371 | Asioco Inc. | | Oil & Gas Operator | Jan 2018 |
| 1372 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 1373 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 1374 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 1375 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 1376 | Aspen Drilling C | | Oil & Gas Operator | Aug 1988 |
| 1377 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 1378 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 1379 | Aspen Exploration | | Oil & Gas Operator | Jan 1983 |
| 1380 | Aspen Exploration Corporation | | Oil & Gas Operator | Dec 2007 |
| 1381 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 1382 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 1383 | Aspen Oil & Gas LLC | | Oil Operator | Jul 2014 |
| 1384 | Aspen Oil Inc | Hobbs, NM 88241 | Oil & Gas Operator | Mar 2019 |
| 1385 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2026 |
| 1386 | Aspen Pumping Service | Artesia, NM 88211 | Oil & Gas Operator | Jan 2009 |
| 1387 | Asphalta LLC | | Oil & Gas Operator | Mar 2026 |
| 1388 | Aspire Exploration LLC | Cleveland, OK 74020-0727 | Oil & Gas Operator | Feb 2015 |
| 1389 | Asseff, George S Oil & Gas Company | | Oil & Gas Operator | Dec 2008 |
| 1390 | Assent Energy Partners, LLC | College Sta, TX 77842 | Oil & Gas Operator | May 2026 |
| 1391 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 1392 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Feb 2026 |
| 1393 | Assiniboine & Sioux Tribes | | Oil & Gas Operator | Mar 1997 |
| 1394 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 1395 | Associated Oil & | | Oil Operator | Mar 1986 |
| 1396 | Associated Oil Properties | Agoura Hills, CA 91376 | Oil Operator | Nov 2020 |
| 1397 | Associated Petro | | Oil & Gas Operator | Aug 1994 |
| 1398 | Associated Petro Invest Inc | Stillwater, OK 74076-2346 | Oil & Gas Operator | May 2013 |
| 1399 | Associated Petroleum Consultants, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2013 |
| 1400 | Astarta Springs Sustainable Farms LLC | | Oil & Gas Operator | Dec 2025 |