| 201 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 202 | Rains & Williamson Oil Co Inc | Wichita, KS 67277 | Oil & Gas Operator | Dec 2025 |
| 203 | Rakestraw Bros., L.L.C | El Dorado, KS 67042 | Oil & Gas Operator | Dec 2019 |
| 204 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Feb 2026 |
| 205 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Dec 2025 |
| 206 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 207 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 208 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 209 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 210 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 211 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Dec 2025 |
| 212 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 213 | Schierling Eldon | | Oil & Gas Operator | Aug 1986 |
| 214 | Schierling, Eldon J. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 215 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Dec 2025 |
| 216 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Jan 2026 |
| 217 | Sierra Petroleum | | Oil & Gas Operator | Sep 1986 |
| 218 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 219 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 220 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2025 |
| 221 | South Central Oil And Gas | | Oil & Gas Operator | Feb 2014 |
| 222 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 223 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 224 | SPS, Inc. | Cheney, KS 67025 | Oil & Gas Operator | Dec 2025 |
| 225 | Steffen Resource Development, LLC | Hutchinson, KS 67502 | Oil & Gas Operator | Dec 2025 |
| 226 | Swander, Everett | Cunningham, KS 67035 | Oil Operator | May 1998 |
| 227 | Te-Pe Oil & Gas | | Oil & Gas Operator | Dec 2025 |
| 228 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 229 | Terra Resc Incor | | Oil Operator | Mar 1986 |
| 230 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 231 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 232 | Texaco USA - Mor | | Oil Operator | Aug 1988 |
| 233 | Tomlinson Oil Co Inc | Great Bend, KS 67530 | Oil & Gas Operator | May 2025 |
| 234 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 235 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 236 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Dec 2025 |
| 237 | Universal Resour | | Oil & Gas Operator | Dec 1996 |
| 238 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 239 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 240 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 241 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 242 | Vincent Oil Corp | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 243 | Walcher Oil, LC | Bellevue, WA 98009 | Oil & Gas Operator | Nov 2025 |
| 244 | Walcher, Wayne E. | Wichita, KS 67202 | Oil & Gas Operator | May 2024 |
| 245 | Wells Energy Com | | Oil & Gas Operator | Mar 1994 |
| 246 | Weston Management & Operations Group | Centreville, MD 21617 | Oil Operator | May 1997 |
| 247 | White Exploration Inc | Wichita, KS 67278 | Oil & Gas Operator | Dec 2025 |
| 248 | White, Robert F. | Wichita, KS 67220 | Oil & Gas Operator | Feb 2007 |
| 249 | Wildcat Oil & Gas LLC | Seneca, KS 66538 | Oil & Gas Operator | Dec 2025 |
| 250 | Wildcat Resources | | Oil & Gas Operator | Jun 2016 |
| 251 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2026 |
| 252 | Wildhorse Resources, LLC | Houston, TX 77279 | Oil & Gas Operator | Feb 2015 |
| 253 | Wilton Petroleum, Inc. | Canton, KS 67428 | Oil & Gas Operator | Dec 2025 |
| 254 | Wirtz Oil, LLC | Ellinwood, KS 67526 | Oil & Gas Operator | Dec 2025 |
| 255 | Wood, E. H., Jr. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2010 |
| 256 | Woodman & Iannit | | Oil & Gas Operator | Sep 1996 |
| 257 | Woolsey Operating Company, LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 258 | Woolsey Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 259 | Younger Energy C | | Oil & Gas Operator | Dec 1996 |
| 260 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |