| 26401 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Jun 2026 |
| 26402 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 26403 | Simme, Steven | Elma, NY 14052 | Gas Operator | Dec 2025 |
| 26404 | Simminger, Robert John Jr | | Oil Operator | Dec 2025 |
| 26405 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 26406 | Simmons Engr & Consulting Co | Farmington, NM 87499 | Gas Operator | Feb 2002 |
| 26407 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 26408 | Simmons Mack McCoy | Cement, OK 73017 | Oil Operator | Jul 2026 |
| 26409 | Simmons Oil Corp | | Oil Operator | Jan 1989 |
| 26410 | Simmons Robert Z | | Oil Operator | Dec 1990 |
| 26411 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 26412 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 26413 | Simmons, Stanley J. | Olney, TX 76374 | Oil & Gas Operator | Aug 1994 |
| 26414 | Simon Joseph W | Carney, OK 74832-0443 | Oil & Gas Operator | Dec 2016 |
| 26415 | Simon Of Bolivar Enterprises Inc | Cuba, NY 14727 | Oil & Gas Operator | Dec 2025 |
| 26416 | Simon Oil Company | Ardmore, OK 73401 | Oil Operator | May 2026 |
| 26417 | Simon Oil LLC | Kaycee, WY 82639 | Oil Operator | May 2026 |
| 26418 | Simon Royce & Joyce | Tecumseh, OK 74873-7341 | Oil Operator | Jun 2018 |
| 26419 | Simon, W. D. Oil Co. | Kermit, TX 79745 | Oil & Gas Operator | Sep 2026 |
| 26420 | Simple Operating LLC | Cross Plains, TX 76443 | Oil Operator | Sep 2026 |
| 26421 | Simpson B T Jr | Orlando, FL 32806 | Oil & Gas Operator | Dec 1986 |
| 26422 | Simpson Bros. Oil Co. | Odessa, TX 79760 | Oil & Gas Operator | Jan 2001 |
| 26423 | Simpson Bros. Oil Co.-Odessa | Odessa, TX 79760 | Oil & Gas Operator | Jan 2001 |
| 26424 | Simpson Gary H | Albion, PA 16401-8008 | Gas Operator | Dec 2014 |
| 26425 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 26426 | Simpson Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Oct 2004 |
| 26427 | Simpson Operating Services, LP | Ballinger, TX 76821 | Oil & Gas Operator | Sep 2026 |
| 26428 | Simpson Well Service, Inc. | | Oil Operator | Dec 1996 |
| 26429 | Simpson, A. E. | Electra, TX 76360 | Oil & Gas Operator | Dec 2006 |
| 26430 | Simray GP, LLC | Richardson, TX 75080 | Oil & Gas Operator | Dec 2015 |
| 26431 | Simray Oil & Gas, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2003 |
| 26432 | Simray Operating Corp. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2009 |
| 26433 | Simray Production Company LP | Richland, TX 75080 | Oil & Gas Operator | Dec 2010 |
| 26434 | Sims, John S. | Lawn, TX 79530 | Oil & Gas Operator | Aug 2003 |
| 26435 | Sinclair Development, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 26436 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Sep 2026 |
| 26437 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 26438 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Sep 2026 |
| 26439 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 26440 | Singer Joseph B Expl Co | Oklahoma City, OK 73118-7486 | Oil & Gas Operator | Mar 1993 |
| 26441 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2026 |
| 26442 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Jun 2026 |
| 26443 | Singer-Fleischaker Oil Co Inc | | Oil & Gas Operator | Jul 1987 |
| 26444 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 26445 | Singer-Fleischaker,Dillon | | Oil & Gas Operator | Aug 1979 |
| 26446 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Sep 2026 |
| 26447 | Singleton Investments, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2012 |
| 26448 | Singletree Resources, Inc. | | Oil Operator | Aug 2014 |
| 26449 | Sink Hole, Inc. | Levelland, TX 79336 | Oil & Gas Operator | Dec 2000 |
| 26450 | Sinkhole Solutions, LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 26451 | Sinow, G. S. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1995 |
| 26452 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 26453 | Sip'S Oil & Gas Inc | Yukon, OK 73099 | Oil & Gas Operator | Sep 2026 |
| 26454 | Sipple Oil Co | Beattyville, KY 41311 | Oil Operator | Dec 2012 |
| 26455 | Sirius Energy Corp. | Abilene, TX 79606 | Oil Operator | Dec 2009 |
| 26456 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 26457 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | May 2026 |
| 26458 | Sissom Oil | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 26459 | Sissom Oil Field Services, LLC | Graham, TX 76450 | Oil Operator | Sep 2026 |
| 26460 | Sisters Of St. Joseph | Clarence, NY 14031 | Gas Operator | Dec 2025 |
| 26461 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 26462 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 26463 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 26464 | Situs Oil & Gas, LLC | Corpus Chrsti, TX 78414 | Oil Operator | Sep 2026 |
| 26465 | Sitwell, Inc. | | Oil Operator | May 2022 |
| 26466 | Sivad Energy No 4 | Akron, NY 14001 | Gas Operator | Dec 2025 |
| 26467 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 26468 | Six Bar Oil LLC | Pine Haven, WY 82721 | Oil & Gas Operator | Jul 2026 |
| 26469 | Six C Oil | Bowie, TX 76230 | Oil & Gas Operator | Sep 2011 |
| 26470 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 26471 | Six-D Exploration, LLC | Hutchinson, KS 67502 | Oil Operator | Apr 2025 |
| 26472 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Sep 2026 |
| 26473 | Sixess Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 26474 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 26475 | SJ Energy, LLC | Englewood, CO 80112 | Oil & Gas Operator | Feb 2019 |
| 26476 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 26477 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 26478 | SJM Oil LLC | | Oil & Gas Operator | Dec 2009 |
| 26479 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2026 |
| 26480 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 26481 | SK Opr Inc | Mars, PA 16046-3811 | Gas Operator | Dec 2025 |
| 26482 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | May 2026 |
| 26483 | Skaar, K. M. Oil & Gas Co. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 26484 | Skaggs Resources LLC | Sapulpa, OK 74066-7930 | Oil Operator | Jun 2026 |
| 26485 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Jul 2026 |
| 26486 | Skeeter Oil L.L.C. | Big Spring, TX 79720 | Oil Operator | Sep 2026 |
| 26487 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 26488 | Skelton Operating Co., Inc. | | Oil & Gas Operator | Aug 1980 |
| 26489 | Skelton, D.W. | | Oil Operator | Dec 1952 |
| 26490 | Skewes Operating Company | Bluefield, VA 24605 | Oil & Gas Operator | Sep 2026 |
| 26491 | Ski Production, LLC | Muenster, TX 76252 | Oil Operator | Sep 2026 |
| 26492 | Skidgel Enterprises Inc | Rawlins, WY 82301 | Oil & Gas Operator | Sep 2018 |
| 26493 | Skidmore Energy,Inc. | Salado, TX 76571 | Oil & Gas Operator | Jun 1999 |
| 26494 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 26495 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 26496 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | Sep 2026 |
| 26497 | Skinner Corporation | | Oil Operator | Apr 1985 |
| 26498 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 26499 | Skinner Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jan 2024 |
| 26500 | Skinner'S Resources & Expl Inc | | Oil & Gas Operator | Jun 2007 |