| 301 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 302 | Springer Benjami | | Gas Operator | Aug 1990 |
| 303 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 304 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Sep 2025 |
| 305 | Sram Oil Incorporated | Winfield, KS 67156 | Oil & Gas Operator | Aug 2005 |
| 306 | Ssouri Oil Ventures | | Oil Operator | Jan 2022 |
| 307 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 308 | St Petroleum, Inc. | Edgerton, KS 66021 | Oil Operator | Sep 2025 |
| 309 | Staab Energy & Leasing | | Oil Operator | Sep 2025 |
| 310 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 311 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 312 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 313 | Stalcup Oil Comp | | Oil Operator | Dec 1992 |
| 314 | Stalcup Oil Company | | Oil Operator | Oct 2009 |
| 315 | Stallings Eugene | | Oil Operator | Jul 1994 |
| 316 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 317 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 318 | Standlee, Jacci L | Ellinwood, KS 67526 | Oil Operator | Aug 2025 |
| 319 | Stanlee Oil LLC | | Oil Operator | Sep 2025 |
| 320 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 321 | Star Resources, LTD. | Wichita, KS 67202 | Oil Operator | Nov 2002 |
| 322 | Stauffer Oil & G | | Oil Operator | Jun 1987 |
| 323 | Stauter, Richard J. | Greeley, CO 80634 | Gas Operator | Apr 1996 |
| 324 | Stebeth Gas Production, Inc. | Beaumont, KS 67012 | Oil Operator | May 1996 |
| 325 | Steckel Oil, LLC | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 326 | Stecklein Oil Co | | Oil Operator | Jul 1993 |
| 327 | Stecklein Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 328 | Steffen Resource Development, LLC | Hutchinson, KS 67502 | Oil & Gas Operator | Sep 2025 |
| 329 | Steinberger Bros., Inc. | Independence, KS 67301 | Oil Operator | Dec 2009 |
| 330 | Steinberger Oil Company | Independence, KS 67301 | Oil & Gas Operator | May 2002 |
| 331 | Steiner Oil And Gas | Lincolnville, KS 66858 | Oil Operator | Jan 1999 |
| 332 | Steinforth, Loren | Yates Center, KS 66783 | Oil Operator | Sep 2014 |
| 333 | Steinle Oil | | Oil Operator | Aug 2021 |
| 334 | Stekoll Petroleu | | Oil Operator | Oct 1985 |
| 335 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 336 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 337 | Stepco Incorpora | | Oil Operator | Nov 1994 |
| 338 | Stepco Oil, Inc. | Ellinwood, KS 67526 | Oil Operator | Jan 2020 |
| 339 | Stepco, Inc. | Ellinwood, KS 67526 | Oil Operator | Feb 2005 |
| 340 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 341 | Stephens Oil Co. | | Oil Operator | Dec 2017 |
| 342 | Stephenson John | | Oil Operator | Dec 1985 |
| 343 | Stephenson L G & | | Oil Operator | Apr 1987 |
| 344 | Sterling Drillin | | Oil & Gas Operator | Mar 1992 |
| 345 | Sterling Drilling Company | Pratt, KS 67124 | Oil & Gas Operator | Apr 2014 |
| 346 | Sterling Explora | | Oil & Gas Operator | Jun 1994 |
| 347 | Sterling Exploration | Lee'S Summit, MO 64082 | Gas Operator | Nov 1997 |
| 348 | Sterling Oil & G | | Oil Operator | May 1984 |
| 349 | Sterling Oil Co. | Sterling, KS 67579 | Oil Operator | Feb 2000 |
| 350 | Sterling Petrole | | Oil & Gas Operator | Sep 1992 |
| 351 | Steve'S Oilfield | | Oil Operator | Jul 1994 |
| 352 | Stewart Oil Co. | | Oil Operator | Jun 2009 |
| 353 | Stewart Oil Comp | | Oil Operator | Jul 1993 |
| 354 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 355 | Stewart Producers, Inc. | Mount Vernon, IL 62864 | Oil & Gas Operator | Sep 2025 |
| 356 | Stewart W C Oil | | Oil Operator | Jun 1986 |
| 357 | Stewart, William C. | Amarillo, TX 79105 | Gas Operator | May 2003 |
| 358 | Stice Oil Company | | Oil Operator | Jul 2025 |
| 359 | Stich Oil Company, A General Partnership | Chanute, KS 66720 | Oil Operator | Jul 2014 |
| 360 | Stifter, Ralph E | Rantoul, KS 66079 | Oil Operator | Sep 2001 |
| 361 | Stixon Petroleum | | Oil Operator | Dec 1996 |
| 362 | STL Oil & Gas LLC | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2016 |
| 363 | Stoeppelwerth DR | | Oil Operator | May 1993 |
| 364 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2025 |
| 365 | Stone Oil Compan | | Oil Operator | Jan 1990 |
| 366 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 367 | Stonegate Ranch LLC | Caney, KS 67333 | Oil Operator | Sep 2025 |
| 368 | Stoskopf, Wayne | Hoisington, KS 67544 | Oil Operator | Apr 1995 |
| 369 | Stotts-Kirkpatri | | Oil Operator | Oct 1991 |
| 370 | Stoudt, Jean Marie | Broken Arrow, OK 74011 | Oil Operator | May 2025 |
| 371 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 372 | Strabala Joseph | | Oil Operator | Jan 1992 |
| 373 | Strait F W Incor | | Oil Operator | Jan 1992 |
| 374 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 375 | Strata Energy Re | | Oil Operator | Nov 1987 |
| 376 | Strata Exploration, Inc. | Fairfield, IL 62837 | Oil & Gas Operator | Sep 2025 |
| 377 | Strata Oil Incor | | Oil Operator | Mar 1994 |
| 378 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Sep 2025 |
| 379 | Stratex Oil & Gas Holdings, Inc. | Watertown, CT 06795 | Oil Operator | Jun 2015 |
| 380 | Streamline Energy, LLC | Yates Center, KS 66783 | Oil & Gas Operator | Dec 2019 |
| 381 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 382 | Stripper Oil Com | | Oil Operator | Nov 1996 |
| 383 | Stripper Oil Company Inc | | Oil Operator | Sep 2025 |
| 384 | Stroke Of Luck Energy & Exploration LLC | Cassoday, KS 66842 | Oil Operator | Sep 2021 |
| 385 | Stromquist C Dal | | Oil & Gas Operator | Aug 1991 |
| 386 | Stromquist, C. Dale, A General Partnership | Liberal, KS 67901 | Oil & Gas Operator | Aug 2010 |
| 387 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 388 | Stubbs & Fleming, A General Partnership | Wichita, KS 67202 | Oil Operator | Jul 2005 |
| 389 | Stuber, VIrgil | Eureka, KS 67045 | Oil Operator | Dec 2019 |
| 390 | Stucky Oil Compa | | Oil Operator | Mar 1988 |
| 391 | Stucky Oil Company | Sedgwick, KS 67135 | Gas Operator | Aug 1999 |
| 392 | Stucky, Edward P. | Sabetha, KS 66534 | Oil Operator | May 1992 |
| 393 | Stucky, Kenneth R. Oil & Gas Operations | Burrton, KS 67020 | Oil & Gas Operator | Aug 2002 |
| 394 | Studer Oil Co. | Pratt, KS 67124 | Oil Operator | Oct 2019 |
| 395 | Studer Oil Compa | | Oil & Gas Operator | Feb 1993 |
| 396 | Stull Crude Co, LLC | | Oil Operator | Sep 2025 |
| 397 | Stull Oil LLC | Natoma, KS 67651 | Oil Operator | Sep 2025 |
| 398 | Sublette Feeders | | Gas Operator | Oct 1996 |
| 399 | Sublette Feeders LLC | Sublette, KS 67877 | Gas Operator | Sep 2025 |
| 400 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |