| 301 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 302 | Star Resources, LTD. | Wichita, KS 67202 | Oil Operator | Nov 2002 |
| 303 | Stauffer Oil & G | | Oil Operator | Jun 1987 |
| 304 | Stauter, Richard J. | Greeley, CO 80634 | Gas Operator | Apr 1996 |
| 305 | Stebeth Gas Production, Inc. | Beaumont, KS 67012 | Oil Operator | May 1996 |
| 306 | Steckel Oil, LLC | Russell, KS 67665 | Oil Operator | May 2026 |
| 307 | Stecklein Oil Co | | Oil Operator | Jul 1993 |
| 308 | Stecklein Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | Mar 2026 |
| 309 | Steffen Resource Development, LLC | Hutchinson, KS 67502 | Oil & Gas Operator | May 2026 |
| 310 | Steinberger Bros., Inc. | Independence, KS 67301 | Oil Operator | Dec 2009 |
| 311 | Steinberger Oil Company | Independence, KS 67301 | Oil & Gas Operator | May 2002 |
| 312 | Steiner Oil And Gas | Lincolnville, KS 66858 | Oil Operator | Jan 1999 |
| 313 | Steinforth, Loren | Yates Center, KS 66783 | Oil Operator | Sep 2014 |
| 314 | Steinle Oil | | Oil Operator | Aug 2021 |
| 315 | Stekoll Petroleu | | Oil Operator | Oct 1985 |
| 316 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 317 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 318 | Stepco Incorpora | | Oil Operator | Nov 1994 |
| 319 | Stepco Oil, Inc. | Ellinwood, KS 67526 | Oil Operator | Jan 2020 |
| 320 | Stepco, Inc. | Ellinwood, KS 67526 | Oil Operator | Feb 2005 |
| 321 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 322 | Stephens Oil Co. | | Oil Operator | Dec 2017 |
| 323 | Stephenson John | | Oil Operator | Dec 1985 |
| 324 | Stephenson L G & | | Oil Operator | Apr 1987 |
| 325 | Sterling Drillin | | Oil & Gas Operator | Mar 1992 |
| 326 | Sterling Drilling Company | Pratt, KS 67124 | Oil & Gas Operator | Apr 2014 |
| 327 | Sterling Explora | | Oil & Gas Operator | Jun 1994 |
| 328 | Sterling Exploration | Lee'S Summit, MO 64082 | Gas Operator | Nov 1997 |
| 329 | Sterling Oil & G | | Oil Operator | May 1984 |
| 330 | Sterling Oil Co. | Sterling, KS 67579 | Oil Operator | Feb 2000 |
| 331 | Sterling Petrole | | Oil & Gas Operator | Sep 1992 |
| 332 | Steve'S Oilfield | | Oil Operator | Jul 1994 |
| 333 | Stewart Oil Co. | | Oil Operator | Jun 2009 |
| 334 | Stewart Oil Comp | | Oil Operator | Jul 1993 |
| 335 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 336 | Stewart Producers, Inc. | Mount Vernon, IL 62864 | Oil & Gas Operator | May 2026 |
| 337 | Stewart W C Oil | | Oil Operator | Jun 1986 |
| 338 | Stewart, William C. | Amarillo, TX 79105 | Gas Operator | May 2003 |
| 339 | Stice Oil Company | | Oil Operator | Mar 2026 |
| 340 | Stich Oil Company, A General Partnership | Chanute, KS 66720 | Oil Operator | Jul 2014 |
| 341 | Stifter, Ralph E | Rantoul, KS 66079 | Oil Operator | Sep 2001 |
| 342 | Stixon Petroleum | | Oil Operator | Dec 1996 |
| 343 | STL Oil & Gas LLC | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2016 |
| 344 | Stoeppelwerth DR | | Oil Operator | May 1993 |
| 345 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2026 |
| 346 | Stone Oil Compan | | Oil Operator | Jan 1990 |
| 347 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 348 | Stonegate Ranch LLC | Caney, KS 67333 | Oil & Gas Operator | May 2026 |
| 349 | Stoskopf, Wayne | Hoisington, KS 67544 | Oil Operator | Apr 1995 |
| 350 | Stotts-Kirkpatri | | Oil Operator | Oct 1991 |
| 351 | Stoudt, Jean Marie | Broken Arrow, OK 74011 | Oil Operator | Apr 2026 |
| 352 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 353 | Strabala Joseph | | Oil Operator | Jan 1992 |
| 354 | Strait F W Incor | | Oil Operator | Jan 1992 |
| 355 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2026 |
| 356 | Strata Energy Re | | Oil Operator | Nov 1987 |
| 357 | Strata Exploration, Inc. | Fairfield, IL 62837 | Oil & Gas Operator | May 2026 |
| 358 | Strata Oil Incor | | Oil Operator | Mar 1994 |
| 359 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | May 2026 |
| 360 | Stratex Oil & Gas Holdings, Inc. | Watertown, CT 06795 | Oil Operator | Jun 2015 |
| 361 | Streamline Energy, LLC | Yates Center, KS 66783 | Oil & Gas Operator | Dec 2019 |
| 362 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 363 | Stripper Oil Com | | Oil Operator | Nov 1996 |
| 364 | Stripper Oil Company Inc | | Oil Operator | May 2026 |
| 365 | Stroke Of Luck Energy & Exploration LLC | Cassoday, KS 66842 | Oil Operator | Sep 2021 |
| 366 | Stromquist C Dal | | Oil & Gas Operator | Aug 1991 |
| 367 | Stromquist, C. Dale, A General Partnership | Liberal, KS 67901 | Oil & Gas Operator | Aug 2010 |
| 368 | Stroud Oil Properties, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2013 |
| 369 | Stubbs & Fleming, A General Partnership | Wichita, KS 67202 | Oil Operator | Jul 2005 |
| 370 | Stuber, VIrgil | Eureka, KS 67045 | Oil Operator | Dec 2019 |
| 371 | Stucky Oil Compa | | Oil Operator | Mar 1988 |
| 372 | Stucky, Edward P. | Sabetha, KS 66534 | Oil Operator | May 1992 |
| 373 | Stucky, Kenneth R. Oil & Gas Operations | Burrton, KS 67020 | Oil & Gas Operator | Aug 2002 |
| 374 | Studer Oil Co. | Pratt, KS 67124 | Oil Operator | Oct 2019 |
| 375 | Studer Oil Compa | | Oil & Gas Operator | Feb 1993 |
| 376 | Stull Crude Co, LLC | | Oil Operator | May 2026 |
| 377 | Stull Oil LLC | Natoma, KS 67651 | Oil Operator | May 2026 |
| 378 | Sublette Feeders LLC | Sublette, KS 67877 | Gas Operator | May 2026 |
| 379 | Suemaur Expl. & Prod., LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 380 | Suerte Oil & Gas LLC | Caney, KS 67333 | Oil Operator | Mar 2025 |
| 381 | Suerte Oil Compa | | Oil & Gas Operator | Oct 1995 |
| 382 | Suerte Oil Company | Howard, KS 67349 | Oil & Gas Operator | Jan 2017 |
| 383 | Sujen Enterprise | | Oil Operator | Sep 1989 |
| 384 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 385 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2026 |
| 386 | Summer Sun Gas, Inc. | Sedan, KS 67361 | Oil & Gas Operator | Dec 2014 |
| 387 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Jul 2026 |
| 388 | Summitt Energy, LLC | Wichita, KS 67218 | Oil Operator | Mar 2026 |
| 389 | Sun Oil Company | Dallas, TX 75373 | Oil & Gas Operator | Dec 2021 |
| 390 | Sun Ventures | Bartlesville, OK 74003 | Oil Operator | Feb 1997 |
| 391 | Sunardo Energy, Inc. | Castle Rock, CO 80104 | Oil Operator | Jan 1997 |
| 392 | Sunburst Explora | | Oil Operator | May 1990 |
| 393 | Sundance Oil & Gas, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Mar 2012 |
| 394 | Sundance Oil, Inc. | Norfolk, NE 68702 | Oil Operator | Aug 1998 |
| 395 | Sundgren, Stephen E. And Jackie | Rosalia, KS 67132 | Oil Operator | Jun 2023 |
| 396 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 397 | Sunfire Energy | | Oil & Gas Operator | May 2026 |
| 398 | Sunflower Energy, LLC | Overland Park, KS 66210 | Oil Operator | Dec 2019 |
| 399 | Sunflower Exploration, LLC | Overland Park, KS 66210 | Gas Operator | May 2026 |
| 400 | Sunflower Well Service, Inc. | Canton, KS 67428 | Oil & Gas Operator | Dec 2025 |