| 5401 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 5402 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 5403 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 5404 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 5405 | Simmons Mack McCoy | Cement, OK 73017 | Oil Operator | Feb 2025 |
| 5406 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 5407 | Simon Joseph W | Carney, OK 74832-0443 | Oil & Gas Operator | Dec 2016 |
| 5408 | Simon Oil Company | Ardmore, OK 73401 | Oil Operator | Jan 2025 |
| 5409 | Simon Royce & Joyce | Tecumseh, OK 74873-7341 | Oil Operator | Jun 2018 |
| 5410 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 5411 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Oct 2025 |
| 5412 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 5413 | Singer Joseph B Expl Co | Oklahoma City, OK 73118-7486 | Oil & Gas Operator | Mar 1993 |
| 5414 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 5415 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | May 2025 |
| 5416 | Siosi Oil & Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2013 |
| 5417 | Sitco Inc | Yukon, OK 73099 | Oil & Gas Operator | Jul 1995 |
| 5418 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 5419 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Jun 2025 |
| 5420 | SJM Inc | Tulsa, OK 74133-1757 | Gas Operator | Apr 2006 |
| 5421 | Sju Holdings LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 5422 | SK Nemaha LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Feb 2021 |
| 5423 | SK Plymouth LLC | Houston, TX 77079-1222 | Oil & Gas Operator | Jun 2025 |
| 5424 | Skaggs Resources LLC | Sapulpa, OK 74066-7930 | Oil Operator | Jun 2025 |
| 5425 | Skeet Oil Production LLC | Grady, OK 73569 | Oil Operator | Jun 2025 |
| 5426 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 5427 | Skull Creek Oil & Gas LLC | | Oil Operator | Jun 2025 |
| 5428 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 5429 | Slavens II Paul R | Tulsa, OK 74131 | Oil & Gas Operator | Jul 2025 |
| 5430 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 5431 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 5432 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 5433 | Sledge Olen | Duncan, OK 73533 | Oil Operator | May 2025 |
| 5434 | Slick Production Inc | Tulsa, OK 74132-1718 | Oil & Gas Operator | Apr 2020 |
| 5435 | Slim Hole Inc | Farmington, NM 87401-7725 | Oil & Gas Operator | May 2013 |
| 5436 | Slinkard, Roberta S | | Oil Operator | May 2025 |
| 5437 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 5438 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Jul 2025 |
| 5439 | Sloan Production Co | | Oil Operator | Jan 2013 |
| 5440 | Slone, VIctor R | | Oil Operator | Jun 2025 |
| 5441 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Jun 2025 |
| 5442 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Oct 2025 |
| 5443 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 5444 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Jun 2025 |
| 5445 | Smart Jr T J | Ryan, OK 73565 | Oil Operator | Sep 1994 |
| 5446 | Smart Service & Equipment LLC | Muskogee, OK 74401-5262 | Oil Operator | Aug 2013 |
| 5447 | Smiley Drilling Co | Oklahoma City, OK 73156-0773 | Oil & Gas Operator | Apr 1999 |
| 5448 | Smith & Smith Petroleum Corp | | Oil & Gas Operator | Apr 2025 |
| 5449 | Smith Al | Duncan, OK 73534-0037 | Oil Operator | Dec 1998 |
| 5450 | Smith Alfred Dba A-S Oil | Walters, OK 73572 | Oil Operator | Jun 2025 |
| 5451 | Smith Bart Oil & Gas Expl Inc | Council Hill, OK 74428-9603 | Oil & Gas Operator | Apr 2015 |
| 5452 | Smith Bob W | Ardmore, OK 73403-5214 | Oil & Gas Operator | Sep 2014 |
| 5453 | Smith Bradley D & Paul C | Pawhuska, OK 74056 | Oil Operator | Apr 2025 |
| 5454 | Smith Brothers Enterprises | Ardmore, OK 73402 | Oil Operator | Jul 1998 |
| 5455 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 5456 | Smith Cheryl A | Copan, OK 74022 | Oil Operator | Jul 2024 |
| 5457 | Smith Claude W | Henryetta, OK 74437-7553 | Oil Operator | May 2008 |
| 5458 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 5459 | Smith Connie M & Sheryle | Chelsea, OK 74016-1959 | Oil Operator | Feb 2017 |
| 5460 | Smith Doug | Tulsa, OK 74107 | Oil & Gas Operator | Feb 2016 |
| 5461 | Smith Edward F | Avant, OK 74001-0024 | Oil & Gas Operator | Nov 2014 |
| 5462 | Smith Energy Company LLC | Purcell, OK 73080-4772 | Oil & Gas Operator | May 2015 |
| 5463 | Smith Harmon K | Wewoka, OK 74884 | Oil & Gas Operator | Jan 2013 |
| 5464 | Smith J S Production | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 5465 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 5466 | Smith Joyce | Okmulgee, OK 74447-6074 | Oil Operator | Mar 2025 |
| 5467 | Smith Manus L MFG Inc | Oklahoma City, OK 73147 | Oil & Gas Operator | Nov 1998 |
| 5468 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | May 2025 |
| 5469 | Smith Mike D | Stillwater, OK 74074 | Oil & Gas Operator | Apr 2015 |
| 5470 | Smith Oil & Gas Co., Inc. | Wichita Falls, TX 76310 | Oil Operator | Dec 2010 |
| 5471 | Smith Patrica\Judith Miller | Collinsville, OK 74021-6307 | Oil Operator | Jun 2010 |
| 5472 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 5473 | Smith Petroleum LLC | Barnsdall, OK 74002-0134 | Oil Operator | Jun 2025 |
| 5474 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 5475 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 5476 | Smith Richard L | Catoosa, OK 74015 | Oil & Gas Operator | Dec 2019 |
| 5477 | Smith Shirley C | Claremore, OK 74017-0060 | Oil & Gas Operator | Mar 2015 |
| 5478 | Smith Terry | Wewoka, OK 74884 | Oil & Gas Operator | Mar 2015 |
| 5479 | Smith Vernon C | Tulsa, OK 74104 | Oil & Gas Operator | Jan 2025 |
| 5480 | Smith VIcki L Palmer | Lawton, OK 73505-1701 | Oil & Gas Operator | Dec 2014 |
| 5481 | Smith, W.T. | Panhandle, TX 79068 | Oil & Gas Operator | Nov 2005 |
| 5482 | Smith, William M | | Oil & Gas Operator | May 2025 |
| 5483 | Smith-Clement Exploration Inc | Edmond, OK 73013 | Oil Operator | Jul 1997 |
| 5484 | Smither Energy Co LLC | Broken Arrow, OK 74011-7615 | Oil & Gas Operator | Nov 2020 |
| 5485 | Smiths Investment Inc | Sperry, OK 74073-4198 | Oil Operator | Jun 2025 |
| 5486 | Smokey Trail LLC | Thornton, CO 80241 | Oil & Gas Operator | Jul 2025 |
| 5487 | Snake Creek Oil & Gas Inc | Okmulgee, OK 74447-2041 | Oil & Gas Operator | Jun 2025 |
| 5488 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 5489 | Sneed Drilling Company | Cleveland, OK 74020 | Oil & Gas Operator | May 2025 |
| 5490 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Jun 2025 |
| 5491 | Snelgrooes Oil Company Inc | Maysville, OK 73057-0631 | Oil & Gas Operator | Nov 2014 |
| 5492 | Snelgrooes Well Service Inc | Elmore City, OK 73433 | Oil & Gas Operator | May 2003 |
| 5493 | SNR Central Oklahoma Operating LLC | Oklahoma City, OK 73116-7906 | Oil Operator | Jun 2025 |
| 5494 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 5495 | Snuffy'S Oilfield Service Inc | Hennessey, OK 73742-6511 | Oil & Gas Operator | Nov 2014 |
| 5496 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 5497 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 5498 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Jul 2025 |
| 5499 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Aug 2025 |
| 5500 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |