| 1301 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 1302 | Simco Petroleum | Cheyenne, WY 82003 | Oil & Gas Operator | Oct 2009 |
| 1303 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Dec 2025 |
| 1304 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 1305 | Simme, Steven | Elma, NY 14052 | Gas Operator | Dec 2024 |
| 1306 | Simminger, Robert John Jr | | Oil Operator | Sep 2025 |
| 1307 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 1308 | Simmons Engr & Consulting Co | Farmington, NM 87499 | Gas Operator | Feb 2002 |
| 1309 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 1310 | Simmons Mack McCoy | Cement, OK 73017 | Oil Operator | Feb 2025 |
| 1311 | Simmons Oil Corp | | Oil Operator | Jan 1989 |
| 1312 | Simmons Robert Z | | Oil Operator | Dec 1990 |
| 1313 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 1314 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 1315 | Simmons, Stanley J. | Olney, TX 76374 | Oil & Gas Operator | Aug 1994 |
| 1316 | Simon Joseph W | Carney, OK 74832-0443 | Oil & Gas Operator | Dec 2016 |
| 1317 | Simon Of Bolivar Enterprises Inc | Cuba, NY 14727 | Oil & Gas Operator | Dec 2024 |
| 1318 | Simon Oil Company | Ardmore, OK 73401 | Oil Operator | Nov 2025 |
| 1319 | Simon Oil LLC | Kaycee, WY 82639 | Oil Operator | Sep 2025 |
| 1320 | Simon Royce & Joyce | Tecumseh, OK 74873-7341 | Oil Operator | Jun 2018 |
| 1321 | Simon, W. D. Oil Co. | Kermit, TX 79745 | Oil & Gas Operator | Feb 2026 |
| 1322 | Simple Operating LLC | Cross Plains, TX 76443 | Oil Operator | Feb 2026 |
| 1323 | Simples Oil International, LLC | Los Angeles, CA 90067 | Oil & Gas Operator | Feb 2026 |
| 1324 | Simpson B T Jr | Orlando, FL 32806 | Oil & Gas Operator | Dec 1986 |
| 1325 | Simpson Bros. Oil Co. | Odessa, TX 79760 | Oil & Gas Operator | Jan 2001 |
| 1326 | Simpson Bros. Oil Co.-Odessa | Odessa, TX 79760 | Oil & Gas Operator | Jan 2001 |
| 1327 | Simpson Gary H | Albion, PA 16401-8008 | Gas Operator | Dec 2014 |
| 1328 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 1329 | Simpson Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Oct 2004 |
| 1330 | Simpson Operating Services, LP | Ballinger, TX 76821 | Oil & Gas Operator | Feb 2026 |
| 1331 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 1332 | Simpson, A. E. | Electra, TX 76360 | Oil & Gas Operator | Dec 2006 |
| 1333 | Simray GP, LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2015 |
| 1334 | Simray Oil & Gas, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2003 |
| 1335 | Simray Operating Corp. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2009 |
| 1336 | Simray Production Company LP | Richland, TX 75080 | Oil & Gas Operator | Dec 2010 |
| 1337 | Sims, John S. | Lawn, TX 79530 | Oil & Gas Operator | Aug 2003 |
| 1338 | Sinclair Development, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 1339 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Feb 2026 |
| 1340 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 1341 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Feb 2026 |
| 1342 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 1343 | Singer Joseph B Expl Co | Oklahoma City, OK 73118-7486 | Oil & Gas Operator | Mar 1993 |
| 1344 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 1345 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Oct 2025 |
| 1346 | Singer-Fleischaker Oil Co Inc | | Oil & Gas Operator | Jul 1987 |
| 1347 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 1348 | Singer-Fleischaker,Dillon | | Oil & Gas Operator | Aug 1979 |
| 1349 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 1350 | Singleton Investments, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2012 |
| 1351 | Singletree Resources, Inc. | | Oil Operator | Aug 2014 |
| 1352 | Sink Hole, Inc. | Levelland, TX 79336 | Oil & Gas Operator | Dec 2000 |
| 1353 | Sinkhole Solutions, LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 1354 | Sinow, G. S. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1995 |
| 1355 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 1356 | Sip'S Oil & Gas Inc | Yukon, OK 73099 | Oil & Gas Operator | Feb 2026 |
| 1357 | Sipple Oil Co | Beattyville, KY 41311 | Oil Operator | Dec 2012 |
| 1358 | Sirius Energy Corp. | Abilene, TX 79606 | Oil Operator | Dec 2009 |
| 1359 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 1360 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 1361 | Sissom Oil | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 1362 | Sissom Oil Field Services, LLC | Graham, TX 76450 | Oil Operator | Feb 2026 |
| 1363 | Sisters Of St. Joseph | Clarence, NY 14031 | Gas Operator | Dec 2024 |
| 1364 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 1365 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 1366 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 1367 | Situs Oil & Gas, LLC | Corpus Chrsti, TX 78414 | Oil Operator | Feb 2026 |
| 1368 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 1369 | Sivad Energy No 4 | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 1370 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 1371 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Dec 2025 |
| 1372 | Six C Oil | Bowie, TX 76230 | Oil & Gas Operator | Sep 2011 |
| 1373 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 1374 | Six-D Exploration, LLC | Hutchinson, KS 67502 | Oil Operator | Apr 2025 |
| 1375 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Feb 2026 |
| 1376 | Sixess Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1377 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 1378 | SJ Energy, LLC | Englewood, CO 80112 | Oil & Gas Operator | Feb 2019 |
| 1379 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 1380 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 1381 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 1382 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 1383 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 1384 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2025 |
| 1385 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Nov 2025 |
| 1386 | Skaar, K. M. Oil & Gas Co. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 1387 | Skaggs Resources LLC | Sapulpa, OK 74066-7930 | Oil Operator | Nov 2025 |
| 1388 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Dec 2025 |
| 1389 | Skeeter Oil L.L.C. | Big Spring, TX 79720 | Oil Operator | Feb 2026 |
| 1390 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 1391 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 1392 | Skelton, D.W. | | Oil Operator | Dec 1952 |
| 1393 | Skewes Operating Company | Bluefield, VA 24605 | Oil & Gas Operator | Feb 2026 |
| 1394 | Ski Production, LLC | Muenster, TX 76252 | Oil Operator | Feb 2026 |
| 1395 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 1396 | Skidmore Energy,Inc. | Salado, TX 76571 | Oil & Gas Operator | Jun 1999 |
| 1397 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 1398 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 1399 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | Feb 2026 |
| 1400 | Skinner Corporation | | Oil Operator | Apr 1985 |