| 5501 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 5502 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 5503 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 5504 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 5505 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 5506 | Simmons Mack McCoy | Cement, OK 73017 | Oil Operator | Feb 2025 |
| 5507 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 5508 | Simon Joseph W | Carney, OK 74832-0443 | Oil & Gas Operator | Dec 2016 |
| 5509 | Simon Oil Company | Ardmore, OK 73401 | Oil Operator | Jan 2025 |
| 5510 | Simon Royce & Joyce | Tecumseh, OK 74873-7341 | Oil Operator | Jun 2018 |
| 5511 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 5512 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Dec 2025 |
| 5513 | Singer Joseph B Expl Co | Oklahoma City, OK 73118-7486 | Oil & Gas Operator | Mar 1993 |
| 5514 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 5515 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Oct 2025 |
| 5516 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 5517 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 5518 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 5519 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 5520 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 5521 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 5522 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 5523 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 5524 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Sep 2025 |
| 5525 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Oct 2025 |
| 5526 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 5527 | Skull Creek Oil & Gas LLC | | Oil Operator | Sep 2025 |
| 5528 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 5529 | Slavens II Paul R | Tulsa, OK 74131 | Oil & Gas Operator | Oct 2025 |
| 5530 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 5531 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 5532 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 5533 | Sledge Olen | Duncan, OK 73533 | Oil Operator | Nov 2025 |
| 5534 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 5535 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 5536 | Slinkard, Roberta S | | Oil Operator | Oct 2025 |
| 5537 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 5538 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Nov 2025 |
| 5539 | Sloan Production Co | | Oil Operator | Jan 2013 |
| 5540 | Slone, VIctor R | | Oil Operator | Jul 2025 |
| 5541 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Oct 2025 |
| 5542 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Dec 2025 |
| 5543 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 5544 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Oct 2025 |
| 5545 | Smart Jr T J | Ryan, OK 73565 | Oil Operator | Sep 1994 |
| 5546 | Smart Service & Equipment LLC | Muskogee, OK 74401-5262 | Oil Operator | Aug 2013 |
| 5547 | Smiley Drilling Co | Oklahoma City, OK 73156-0773 | Oil & Gas Operator | Apr 1999 |
| 5548 | Smith & Smith Petroleum Corp | | Oil & Gas Operator | Sep 2025 |
| 5549 | Smith Al | Duncan, OK 73534-0037 | Oil Operator | Dec 1998 |
| 5550 | Smith Alfred Dba A-S Oil | Walters, OK 73572 | Oil Operator | Sep 2025 |
| 5551 | Smith Bart Oil & Gas Expl Inc | Council Hill, OK 74428-9603 | Oil & Gas Operator | Apr 2015 |
| 5552 | Smith Bob W | Ardmore, OK 73403-5214 | Oil & Gas Operator | Sep 2014 |
| 5553 | Smith Bradley D & Paul C | Pawhuska, OK 74056 | Oil Operator | Oct 2025 |
| 5554 | Smith Brothers Enterprises | Ardmore, OK 73402 | Oil Operator | Jul 1998 |
| 5555 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 5556 | Smith Cheryl A | Copan, OK 74022 | Oil Operator | Jul 2025 |
| 5557 | Smith Claude W | Henryetta, OK 74437-7553 | Oil Operator | May 2008 |
| 5558 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 5559 | Smith Connie M & Sheryle | Chelsea, OK 74016-1959 | Oil Operator | Feb 2017 |
| 5560 | Smith Doug | Tulsa, OK 74107 | Oil & Gas Operator | Feb 2016 |
| 5561 | Smith Edward F | Avant, OK 74001-0024 | Oil & Gas Operator | Nov 2014 |
| 5562 | Smith Energy Company LLC | Purcell, OK 73080-4772 | Oil & Gas Operator | May 2015 |
| 5563 | Smith Harmon K | Wewoka, OK 74884 | Oil & Gas Operator | Jan 2013 |
| 5564 | Smith J S Production | Seminole, OK 74868 | Oil & Gas Operator | Oct 2025 |
| 5565 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 5566 | Smith Joyce | Okmulgee, OK 74447-6074 | Oil Operator | Mar 2025 |
| 5567 | Smith Manus L MFG Inc | Oklahoma City, OK 73147 | Oil & Gas Operator | Nov 1998 |
| 5568 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Oct 2025 |
| 5569 | Smith Mike D | Stillwater, OK 74074 | Oil & Gas Operator | Apr 2015 |
| 5570 | Smith Oil And Gas Co | Wichita Falls, TX 76310 | Oil Operator | Dec 2010 |
| 5571 | Smith Patrica\Judith Miller | Collinsville, OK 74021-6307 | Oil Operator | Jun 2010 |
| 5572 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 5573 | Smith Petroleum LLC | Barnsdall, OK 74002-0134 | Oil Operator | Oct 2025 |
| 5574 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 5575 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2025 |
| 5576 | Smith Richard L | Catoosa, OK 74015 | Oil & Gas Operator | Dec 2019 |
| 5577 | Smith Shirley C | Claremore, OK 74017-0060 | Oil & Gas Operator | Mar 2015 |
| 5578 | Smith Terry | Wewoka, OK 74884 | Oil & Gas Operator | Mar 2015 |
| 5579 | Smith Vernon C | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2025 |
| 5580 | Smith VIcki L Palmer | Lawton, OK 73505-1701 | Oil & Gas Operator | Dec 2014 |
| 5581 | Smith, W.T. | Panhandle, TX 79068 | Oil & Gas Operator | Nov 2005 |
| 5582 | Smith, William M | | Oil & Gas Operator | Oct 2025 |
| 5583 | Smith-Clement Exploration Inc | Edmond, OK 73013 | Oil Operator | Jul 1997 |
| 5584 | Smither Energy Co LLC | Broken Arrow, OK 74011-7615 | Oil & Gas Operator | Nov 2020 |
| 5585 | Smiths Investment Inc | Sperry, OK 74073-4198 | Oil Operator | Aug 2025 |
| 5586 | Smokey Trail LLC | Thornton, CO 80241 | Oil & Gas Operator | Nov 2025 |
| 5587 | Snake Creek Oil & Gas Inc | Okmulgee, OK 74447-2041 | Oil & Gas Operator | Oct 2025 |
| 5588 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 5589 | Sneed Drilling Company | Cleveland, OK 74020 | Oil & Gas Operator | Jul 2025 |
| 5590 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Oct 2025 |
| 5591 | Snelgrooes Oil Company Inc | Maysville, OK 73057-0631 | Oil & Gas Operator | Nov 2014 |
| 5592 | Snelgrooes Well Service Inc | Elmore City, OK 73433 | Oil & Gas Operator | May 2003 |
| 5593 | SNR Central Oklahoma Operating LLC | Oklahoma City, OK 73116-7906 | Oil Operator | Oct 2025 |
| 5594 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 5595 | Snuffy'S Oilfield Service Inc | Hennessey, OK 73742-6511 | Oil & Gas Operator | Nov 2014 |
| 5596 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 5597 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 5598 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Oct 2025 |
| 5599 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Nov 2025 |
| 5600 | Son Petroleum | Bakersfield, CA 93309 | Oil & Gas Operator | Mar 1994 |