| 201 | SCZ Resources, LLC | Houston, TX 77055 | Oil Operator | Dec 2025 |
| 202 | Shultz, Melvin W. | Parsons, KS 67357 | Oil Operator | Nov 1995 |
| 203 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Jan 2026 |
| 204 | Specht Farms | Piqua, KS 66761 | Oil Operator | Nov 2009 |
| 205 | Splechter, Tim | Yates Center, KS 66783 | Oil Operator | Dec 2025 |
| 206 | Stephenson L G & | | Oil Operator | Apr 1987 |
| 207 | Strata Oil Incor | | Oil Operator | Mar 1994 |
| 208 | Sujen Enterprise | | Oil Operator | Sep 1989 |
| 209 | T.C.G. Oil Co. | Iola, KS 66749 | Oil Operator | Sep 2009 |
| 210 | Taylor-Cranor Oi | | Oil Operator | Dec 1987 |
| 211 | Tech American Re | | Oil Operator | Sep 1985 |
| 212 | Texokan Energy C | | Oil Operator | Nov 1986 |
| 213 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2025 |
| 214 | Thompson, Don W | Herington, KS 67449 | Oil Operator | Jul 2003 |
| 215 | Timberlake Energy Corporation | Cypress, TX 77429 | Oil Operator | Nov 2013 |
| 216 | Tontol, LLC | Scottsdale, AZ 85250 | Oil Operator | Nov 2025 |
| 217 | Tri-L Oil Co. | | Oil Operator | Sep 2015 |
| 218 | Triple B Crude, LLC | Colony, KS 66015 | Oil Operator | Nov 2025 |
| 219 | Triple C Petroleum LLC | Colony, KS 66015 | Oil Operator | Nov 2019 |
| 220 | TWM Production Co., A General Partnership | Chanute, KS 66720 | Oil Operator | Nov 2025 |
| 221 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 222 | Vast Petroleum Corporation | Highland, UT 84003 | Oil Operator | Jan 2016 |
| 223 | Verde Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 224 | Viva International, Inc. | Overland Park, KS 66207 | Oil Operator | Jun 2023 |
| 225 | W & W Prod Compa | | Oil Operator | Oct 1995 |
| 226 | W & W Production Company, General Partnership | Chanute, KS 66720 | Oil & Gas Operator | Dec 2025 |
| 227 | W&W Oil Co | Denver City, TX 79323 | Oil Operator | Jun 2002 |
| 228 | W-R Oil Company | | Oil Operator | Jul 1990 |
| 229 | W4 Energy, LLC | Humboldt, KS 66748 | Gas Operator | Nov 2015 |
| 230 | Way Drilling Com | | Oil & Gas Operator | Mar 1993 |
| 231 | Wells-Battelstei | | Oil & Gas Operator | Mar 1993 |
| 232 | Whitaker Companies, Inc. | Humboldt, KS 66748 | Oil & Gas Operator | Apr 2025 |
| 233 | Whitaker Harold | | Oil Operator | Aug 1990 |
| 234 | White Gas & Oil | Mesa, AZ 85210 | Oil Operator | Oct 2006 |
| 235 | William G Smith Oil, LLC | Osawatomie, KS 66064 | Oil Operator | Apr 2014 |
| 236 | Willis Energy | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2009 |
| 237 | Wimsett Kenneth | | Oil Operator | Apr 1989 |
| 238 | Wintershall Oil | | Oil Operator | Sep 1985 |
| 239 | Wrestler Ronald | | Oil Operator | Dec 1994 |
| 240 | Wrestler, David L., A General Partnership | Humboldt, KS 66748 | Oil Operator | Dec 2025 |
| 241 | Wrestler, Ronald D., A General Partnership | Elsmore, KS 66732 | Oil Operator | Apr 2025 |
| 242 | Yocham Oil Company | | Oil Operator | Dec 2025 |
| 243 | Zoandra Petroleu | | Oil & Gas Operator | May 1993 |