| 401 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 402 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | Aug 2025 |
| 403 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 404 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Aug 2025 |
| 405 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Sep 2025 |
| 406 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | May 2025 |
| 407 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 408 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 409 | Southfourk Partners LLC | Blanchard, OK 73010-7209 | Oil Operator | Aug 2025 |
| 410 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 411 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 412 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 413 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 414 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 415 | Southwest Energy Development Inc | Bison, OK 73720 | Oil & Gas Operator | Aug 2025 |
| 416 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 417 | Southwest Petroleum Corp | Drumright, OK 74030 | Oil & Gas Operator | Mar 2018 |
| 418 | Southwest Petroleum Oil & Gas Explor LLC | San Bernardino, CA 92404-1010 | Oil & Gas Operator | Jun 2022 |
| 419 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 420 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Aug 2025 |
| 421 | Southwestern Oil Corporation | Oklahoma City, OK 73106 | Oil Operator | Aug 2025 |
| 422 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 423 | Spark'S Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2014 |
| 424 | Sparkman Rodger E | Jenks, OK 74037-0267 | Oil Operator | Sep 2018 |
| 425 | Sparks Daniel M | Chickasha, OK 73023-1435 | Oil & Gas Operator | Apr 2014 |
| 426 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Aug 2025 |
| 427 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | May 2025 |
| 428 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 429 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Sep 2025 |
| 430 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | Sep 2025 |
| 431 | Sparrow Operating LLC | Comanche, OK 73529-9747 | Oil Operator | Aug 2025 |
| 432 | Spartan Resources LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 433 | Spearpoint Energy LLC | Seminole, OK 74818-1247 | Oil Operator | Jun 2015 |
| 434 | Spears Terry | Osage, OK 74054 | Oil Operator | Aug 2025 |
| 435 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 436 | Spectrum Energy Inc | Scottsdale, AZ 85257 | Oil & Gas Operator | Oct 2003 |
| 437 | Spectrum Field Services Inc | Tulsa, OK 74136-3400 | Oil & Gas Operator | Jan 2004 |
| 438 | Spectrum Oil Company | Irving, TX 75063 | Oil & Gas Operator | May 2013 |
| 439 | Speed James F | Ada, OK 74821-1221 | Oil & Gas Operator | Nov 2009 |
| 440 | Speer Kenneth G | Seminole, OK 74818-1202 | Oil & Gas Operator | Dec 2001 |
| 441 | Speir R M Operating Company | Walters, OK 73572-3933 | Oil Operator | Aug 2025 |
| 442 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Aug 2025 |
| 443 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Aug 2025 |
| 444 | Spencer Oil Company LLC | Bartlesville, OK 74006 | Oil Operator | Jan 2015 |
| 445 | Sperry R J | Dallas, TX 75254-8647 | Oil & Gas Operator | Aug 2013 |
| 446 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Sep 2025 |
| 447 | Spicer Oil Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2008 |
| 448 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2025 |
| 449 | Spire Asset Management LLC | Lafayette, CO 80026 | Oil & Gas Operator | Aug 2025 |
| 450 | Spirit Energy Inc | Edmond, OK 73034 | Oil & Gas Operator | Apr 1999 |
| 451 | Spitfire Energy Group LLC | Oklahoma City, OK 73114-7444 | Oil Operator | Apr 2023 |
| 452 | Splawn & Splawn | Saint Louis, OK 74866-0098 | Oil & Gas Operator | Mar 2025 |
| 453 | Sportsman Oil, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 1998 |
| 454 | Spragins Ed S | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 455 | Spring Operating Company | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 456 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 457 | Spring Tide Petroleum Inc | Broken Arrow, OK 74011-6651 | Oil & Gas Operator | Nov 2024 |
| 458 | Spring Valley Oil & Gas Inc | Drummond, OK 73735 | Oil & Gas Operator | Sep 2025 |
| 459 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 460 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 461 | Spurgeon William Allan | Nowata, OK 74048-9713 | Oil Operator | Feb 2010 |
| 462 | Spurgeon William C & Tammy D | Hominy, OK 74035 | Oil & Gas Operator | Aug 2025 |
| 463 | Squirrel Oil & Gas Inc | Tonkawa, OK 74653 | Oil & Gas Operator | Mar 2022 |
| 464 | SRW Operating LLC | Duncan, OK 73534-2087 | Oil & Gas Operator | Sep 2014 |
| 465 | SSB Production LC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2025 |
| 466 | St Joe Petroleum U S Corp | | Oil & Gas Operator | Aug 2000 |
| 467 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 468 | St Oil Company LLC | New York, NY 10005-4016 | Oil Operator | Aug 2025 |
| 469 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 470 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 471 | Staats & Martin | | Oil Operator | Aug 2013 |
| 472 | Staats, William N | | Oil & Gas Operator | Jun 2025 |
| 473 | Stacy Operating LLC | Cushing, OK 74023 | Oil & Gas Operator | Aug 2025 |
| 474 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 475 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Sep 2025 |
| 476 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Aug 2025 |
| 477 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 478 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 479 | Stalnaker Oil Company | Maud, OK 74854-0295 | Oil Operator | May 2017 |
| 480 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 481 | Stamic Oil LLC | Duncan, OK 73534-1898 | Oil & Gas Operator | Oct 2021 |
| 482 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 483 | Stanton Leo F & Leo H | Wynona, OK 74084 | Oil & Gas Operator | Jun 1999 |
| 484 | Stanton, Joni R | | Oil Operator | Jul 2025 |
| 485 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 486 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 487 | Starbrite Energy LLC | Enid, OK 73702-0549 | Oil & Gas Operator | Oct 2018 |
| 488 | Stargas Co | Tulsa, OK 74136-5407 | Oil & Gas Operator | Aug 2013 |
| 489 | Stark Oil Properties | Asher, OK 74826 | Oil & Gas Operator | Jan 1997 |
| 490 | Starks Leslie | Wetumka, OK 74883-0003 | Oil & Gas Operator | Oct 1995 |
| 491 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 492 | State Oil Company | | Oil & Gas Operator | Mar 2006 |
| 493 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 494 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 495 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 496 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Dec 2025 |
| 497 | Stauros Operating Company | Edmond, OK 73083-2707 | Oil & Gas Operator | Mar 2001 |
| 498 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 499 | Stedman Oil & Gas LLC | Hobart, OK 73651-1624 | Oil & Gas Operator | Mar 2015 |
| 500 | Steele Jr Guy M Test Trust | Dallas, TX 75230 | Gas Operator | Mar 2018 |