| 201 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 202 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 203 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 204 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 205 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 206 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 207 | SLMW Energy Comp | | Oil Operator | Jan 1989 |
| 208 | Slo Oil, LLC | El Dorado, KS 67042 | Oil Operator | Dec 2025 |
| 209 | Sloan Operations | | Oil Operator | Feb 2026 |
| 210 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2026 |
| 211 | SMG Resources LLC | | Oil & Gas Operator | Feb 2026 |
| 212 | Smith Oil & Gas LLC | Livermore, CO 80536 | Gas Operator | Feb 2026 |
| 213 | Smith Oil Co. | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 214 | Smith Oil Compan | | Oil Operator | Sep 1994 |
| 215 | Smith Oil Operations | | Oil & Gas Operator | Feb 2026 |
| 216 | Smith Ranch Company | Sharon Springs, KS 67758 | Gas Operator | May 2002 |
| 217 | Smith Richard F | | Oil Operator | Jun 1995 |
| 218 | Smith Todd W Oil | | Oil Operator | Jan 1994 |
| 219 | Smith, Darrin R | Wilson, KS 67490 | Oil Operator | Jan 2026 |
| 220 | Smith, David | Wichita Falls, TX 76310 | Oil Operator | Jun 2026 |
| 221 | Smith, Edward J. | Clifton, NJ 07013 | Oil & Gas Operator | Dec 1995 |
| 222 | Smith, Gordon R. | Madison, KS 66860 | Oil Operator | Nov 1998 |
| 223 | Smith, Loren L. | Oswego, KS 67356 | Oil & Gas Operator | Sep 2009 |
| 224 | Smitherman, Leon C., Jr. | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 225 | Smokey Valley Resources | Lyons, KS 67554 | Oil Operator | Jun 1998 |
| 226 | Smokey Valley Resources, Inc. | Geneseo, KS 67444 | Oil Operator | Nov 2008 |
| 227 | Smoky Valley Res | | Oil & Gas Operator | Dec 1995 |
| 228 | Snedco, Inc. | Chickasha, OK 73023 | Oil Operator | Feb 2026 |
| 229 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | Jun 2026 |
| 230 | SNR Kansas Operating, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2019 |
| 231 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 232 | Snyder K E Compa | | Oil Operator | Jul 1987 |
| 233 | Snyder Partners, General Partnership | Cody, WY 82414 | Oil & Gas Operator | Jul 2019 |
| 234 | Snyder, Jim Estate (Deceased) | Hamilton, KS 66853 | Oil Operator | Dec 2009 |
| 235 | Snyder, K. Lance | Hamilton, KS 66853 | Oil Operator | Nov 2004 |
| 236 | So & Jo, LLC | Kansas City, MO 64158 | Oil Operator | Dec 2021 |
| 237 | So-I , A General Partnership | Kansas City, MO 64106 | Oil & Gas Operator | Jun 2025 |
| 238 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2026 |
| 239 | Soles Larry - Fe | | Oil Operator | Nov 1986 |
| 240 | Somerset Energy | | Oil Operator | Feb 1986 |
| 241 | Somerset Energy, Inc. | Louisburg, KS 66053 | Oil Operator | Dec 2023 |
| 242 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 243 | Sonoma Resources LLC | Andover, KS 67002 | Oil & Gas Operator | Feb 2026 |
| 244 | Sorensen, Kim A. | Abbyville, KS 67510 | Oil Operator | Oct 2025 |
| 245 | Sotta, Donald E. | McCune, KS 66753 | Oil Operator | Dec 2025 |
| 246 | Soule, Gilbert A. | Madison, KS 66860 | Oil Operator | Jan 2002 |
| 247 | Soule, Richard A. | Eureka, KS 67045 | Oil Operator | Sep 2019 |
| 248 | Source Energy Midcon LLC | Highlands Ranch, CO 80129 | Oil Operator | Jul 2015 |
| 249 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 250 | South Bay Oil Corporation | Wichita, KS 67202 | Oil Operator | Dec 2019 |
| 251 | South Central Oil And Gas | | Oil & Gas Operator | Feb 2014 |
| 252 | South Forty Inc (The) | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 253 | South Of Briles | | Oil Operator | Aug 1989 |
| 254 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 255 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 256 | Southern Hills Gas Co. | | Oil Operator | Oct 2025 |
| 257 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Feb 2026 |
| 258 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 259 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 260 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 261 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 262 | Southwest Gas Storage Company | | Gas Operator | Feb 2026 |
| 263 | Southwest Operating Company | Overland Park, KS 66212 | Oil & Gas Operator | Mar 2012 |
| 264 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 265 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 266 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 267 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 268 | Sowle Exploratio | | Oil Operator | Aug 1986 |
| 269 | Sowle Explorations | | Oil Operator | Dec 2002 |
| 270 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 271 | Specht Farms | Piqua, KS 66761 | Oil Operator | Nov 2009 |
| 272 | Specht Oil | Iola, KS 66749 | Oil Operator | Mar 1998 |
| 273 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2026 |
| 274 | Speedy Well Service | | Oil & Gas Operator | Feb 2026 |
| 275 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2026 |
| 276 | Spindletop Oil & | | Oil Operator | Jun 1993 |
| 277 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2026 |
| 278 | Spines Explorati | | Oil & Gas Operator | Dec 1990 |
| 279 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 280 | Spivey, William | Hays, KS 67601 | Oil Operator | Jun 1993 |
| 281 | Splechter, Tim | Yates Center, KS 66783 | Oil Operator | Feb 2026 |
| 282 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | Feb 2026 |
| 283 | Spring Creek Farm And Oil, LLC | Bixby, OK 74008 | Oil Operator | Jun 2025 |
| 284 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 285 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 286 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Feb 2026 |
| 287 | Sram Oil Incorporated | Winfield, KS 67156 | Oil & Gas Operator | Aug 2005 |
| 288 | Ssouri Oil Ventures | | Oil Operator | Jan 2022 |
| 289 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 290 | St Petroleum, Inc. | Edgerton, KS 66021 | Oil Operator | Feb 2026 |
| 291 | Staab Energy & Leasing | | Oil Operator | Sep 2025 |
| 292 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 293 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 294 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 295 | Stalcup Oil Comp | | Oil Operator | Dec 1992 |
| 296 | Stalcup Oil Company | | Oil Operator | Oct 2009 |
| 297 | Stallings Eugene | | Oil Operator | Jul 1994 |
| 298 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 299 | Standard Operating Company | Wichita, KS 67205 | Oil & Gas Operator | Dec 2019 |
| 300 | Stanlee Oil LLC | | Oil Operator | Feb 2026 |