| 201 | Simmons Oil Corporation | | Oil Operator | Jan 1989 |
| 202 | Simmons Robert Z | | Oil Operator | Dec 1990 |
| 203 | Single Barrel Oil And Gas LLC | Granbury, TX 76048 | Oil & Gas Operator | Jun 2025 |
| 204 | Sirius Energy Corp. | Abilene, TX 79606 | Oil Operator | Dec 2009 |
| 205 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Feb 2025 |
| 206 | Six-D Exploration, LLC | Hutchinson, KS 67502 | Oil Operator | Aug 2024 |
| 207 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 208 | SKKM Oil Company | | Oil Operator | Dec 1992 |
| 209 | Sky Oil, L.L.C. | St. Paul, KS 66771 | Oil Operator | Dec 2004 |
| 210 | Slawson Explorat | | Oil & Gas Operator | Dec 1996 |
| 211 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 212 | Slawson, Donald C. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2024 |
| 213 | SLMW Energy Comp | | Oil Operator | Jan 1989 |
| 214 | Slo Oil, LLC | El Dorado, KS 67042 | Oil Operator | Nov 2024 |
| 215 | Sloan Operations | | Oil Operator | Oct 2024 |
| 216 | SM Oil & Gas Inc | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2025 |
| 217 | Smith Oil & Gas LLC | Livermore, CO 80536 | Gas Operator | Feb 2025 |
| 218 | Smith Oil Compan | | Oil Operator | Sep 1994 |
| 219 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Dec 2024 |
| 220 | Smith Oil Operations | | Oil & Gas Operator | Feb 2025 |
| 221 | Smith Ranch Company | Sharon Springs, KS 67758 | Gas Operator | May 2002 |
| 222 | Smith Richard F | | Oil Operator | Jun 1995 |
| 223 | Smith Todd W Oil | | Oil Operator | Jan 1994 |
| 224 | Smith, Darrin R | Wilson, KS 67490 | Oil Operator | Feb 2025 |
| 225 | Smith, David | Wichita Falls, TX 76310 | Oil Operator | Jun 2025 |
| 226 | Smith, Edward J. | Clifton, NJ 07013 | Oil & Gas Operator | Dec 1995 |
| 227 | Smith, Gordon R. | Madison, KS 66860 | Oil Operator | Nov 1998 |
| 228 | Smith, Loren L. | Oswego, KS 67356 | Oil & Gas Operator | Sep 2009 |
| 229 | Smitherman, Leon C., Jr. | Andover, KS 67002 | Oil Operator | Feb 2025 |
| 230 | Smokey Valley Resources | Lyons, KS 67554 | Oil Operator | Jun 1998 |
| 231 | Smokey Valley Resources, Inc. | Geneseo, KS 67444 | Oil Operator | Nov 2008 |
| 232 | Smoky Valley Res | | Oil & Gas Operator | Dec 1995 |
| 233 | Snedco, Inc. | Chickasha, OK 73023 | Oil Operator | Dec 2024 |
| 234 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | Jun 2025 |
| 235 | SNR Kansas Operating, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2019 |
| 236 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 237 | Snyder K E Compa | | Oil Operator | Jul 1987 |
| 238 | Snyder Partners, General Partnership | Cody, WY 82414 | Oil & Gas Operator | Jul 2019 |
| 239 | Snyder, Jim Estate (Deceased) | Hamilton, KS 66853 | Oil Operator | Dec 2009 |
| 240 | Snyder, K. Lance | Hamilton, KS 66853 | Oil Operator | Nov 2004 |
| 241 | So & Jo, LLC | Kansas City, MO 64158 | Oil Operator | Dec 2021 |
| 242 | So-I , A General Partnership | Kansas City, MO 64106 | Oil & Gas Operator | Nov 2023 |
| 243 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2025 |
| 244 | Soles Larry - Fe | | Oil Operator | Nov 1986 |
| 245 | Somerset Energy | | Oil Operator | Feb 1986 |
| 246 | Somerset Energy, Inc. | Louisburg, KS 66053 | Oil Operator | Dec 2024 |
| 247 | Sommer Oil LLC | Richmond, KS 66080 | Oil Operator | Dec 2024 |
| 248 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 249 | Sonoma Resources LLC | Andover, KS 67002 | Oil & Gas Operator | Feb 2025 |
| 250 | Sorensen, Kim A. | Abbyville, KS 67510 | Oil Operator | Oct 2024 |
| 251 | Sotta, Donald E. | McCune, KS 66753 | Oil Operator | Dec 2024 |
| 252 | Soule, Gilbert A. | Madison, KS 66860 | Oil Operator | Jan 2002 |
| 253 | Soule, Richard A. | Eureka, KS 67045 | Oil Operator | Sep 2019 |
| 254 | Source Energy Midcon LLC | Highlands Ranch, CO 80129 | Oil Operator | Jul 2015 |
| 255 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 256 | South Bay Oil Corporation | Wichita, KS 67202 | Oil Operator | Dec 2019 |
| 257 | South Central Oil And Gas | | Oil & Gas Operator | Feb 2014 |
| 258 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 259 | South Of Briles | | Oil Operator | Aug 1989 |
| 260 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 261 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 262 | Southern Hills Gas Co. | | Oil Operator | Oct 2024 |
| 263 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | Feb 2025 |
| 264 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 265 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 266 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 267 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 268 | Southwest Gas Storage Company | | Gas Operator | Feb 2025 |
| 269 | Southwest Operating Company | Overland Park, KS 66212 | Oil & Gas Operator | Mar 2012 |
| 270 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 271 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 272 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 273 | Sovereign Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 274 | Sowle Exploratio | | Oil Operator | Aug 1986 |
| 275 | Sowle Explorations | | Oil Operator | Dec 2002 |
| 276 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 277 | Specht Farms | Piqua, KS 66761 | Oil Operator | Nov 2009 |
| 278 | Specht Oil | Iola, KS 66749 | Oil Operator | Mar 1998 |
| 279 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 280 | Speedy Well Service | | Oil & Gas Operator | Sep 2024 |
| 281 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 282 | Spindletop Oil & | | Oil Operator | Jun 1993 |
| 283 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jun 2025 |
| 284 | Spines Explorati | | Oil & Gas Operator | Dec 1990 |
| 285 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 286 | Spivey, William | Hays, KS 67601 | Oil Operator | Jun 1993 |
| 287 | Splechter, Tim | Yates Center, KS 66783 | Oil Operator | Feb 2025 |
| 288 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | Feb 2025 |
| 289 | Spring Creek Farm And Oil, LLC | Bixby, OK 74008 | Oil Operator | Sep 2022 |
| 290 | Spring, Harry A. | Ardmore, OK 73401 | Oil Operator | Jul 2012 |
| 291 | Springer, Lee A. | Independence, KS 67301 | Oil Operator | May 2014 |
| 292 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Feb 2025 |
| 293 | Sram Oil Incorporated | Winfield, KS 67156 | Oil & Gas Operator | Aug 2005 |
| 294 | Ssouri Oil Ventures | | Oil Operator | Jan 2022 |
| 295 | St Petroleum, Inc. | Edgerton, KS 66021 | Oil Operator | Feb 2025 |
| 296 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 297 | Staab Energy & Leasing | | Oil Operator | May 2024 |
| 298 | Staab Oil Co., A General Partnership | Hays, KS 67601 | Oil Operator | Feb 2025 |
| 299 | Stack Production | Dewey, OK 74029 | Oil & Gas Operator | Mar 2002 |
| 300 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |