| 201 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 202 | Ritchie Exploration | | Oil Operator | Aug 1995 |
| 203 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2025 |
| 204 | Robert-Gay Energ | | Oil & Gas Operator | Jun 1992 |
| 205 | Rockhound Petroleum, LLC | St. John, KS 67576 | Oil & Gas Operator | Dec 2025 |
| 206 | S.J. Titan Co., A General Partnership | Hutchinson, KS 67502 | Oil & Gas Operator | May 2015 |
| 207 | Scheck Oil Operation | | Oil & Gas Operator | Dec 2025 |
| 208 | Seelig Oil Corpo | | Oil Operator | Apr 1985 |
| 209 | Seibert Oil, LLC | Macksville, KS 67557 | Oil & Gas Operator | Jul 2025 |
| 210 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2026 |
| 211 | Sharp Engineerin | | Oil Operator | Aug 1995 |
| 212 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Dec 2025 |
| 213 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 214 | Smokey Valley Resources, Inc. | Geneseo, KS 67444 | Oil Operator | Nov 2008 |
| 215 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2025 |
| 216 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 217 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2026 |
| 218 | Stalcup Oil Comp | | Oil Operator | Dec 1992 |
| 219 | Stephenson L G & | | Oil Operator | Apr 1987 |
| 220 | Sterling Drillin | | Oil & Gas Operator | Mar 1992 |
| 221 | Sterling Drilling Company | Pratt, KS 67124 | Oil & Gas Operator | Apr 2014 |
| 222 | Sterling Oil Co. | Sterling, KS 67579 | Oil Operator | Feb 2000 |
| 223 | Sunburst Explora | | Oil Operator | May 1990 |
| 224 | Tengasco, Inc. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 225 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 226 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 227 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Dec 2025 |
| 228 | Todd C H Incorpo | | Oil & Gas Operator | Feb 1994 |
| 229 | Tomkat, LTD. | Wichita, KS 67278 | Oil & Gas Operator | Oct 2009 |
| 230 | Toto Energy, LLC | Spring, TX 77380 | Oil & Gas Operator | Dec 2019 |
| 231 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 232 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 233 | Turnco Drilling, Inc. | Portland, OR 97208 | Oil & Gas Operator | Dec 2009 |
| 234 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 235 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 236 | Vamco Operations | | Oil & Gas Operator | Dec 2025 |
| 237 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2026 |
| 238 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 239 | Victory Operating, Inc. | Andover, KS 67002 | Oil & Gas Operator | Dec 2025 |
| 240 | Vincent Oil Corp | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 241 | Vji Natural Resources, Inc. | | Oil & Gas Operator | Dec 2025 |
| 242 | Walcher, Wayne E. | Wichita, KS 67202 | Oil & Gas Operator | May 2024 |
| 243 | Wapiti Petroleum, LLC | | Oil & Gas Operator | Dec 2025 |
| 244 | Ward Feed Yard, Inc. | Larned, KS 67550 | Oil & Gas Operator | Mar 2016 |
| 245 | Wausau Development Corporation | Laurel, MS 39440 | Oil & Gas Operator | Sep 2019 |
| 246 | White & Ellis DR | | Oil & Gas Operator | Aug 1995 |
| 247 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 248 | White Hawk Oil C | | Oil & Gas Operator | Sep 1995 |
| 249 | White Hawk Oil Company, A General Partnership | Tulsa, OK 74101 | Oil Operator | Dec 2025 |
| 250 | Winona Oil & Gas | | Oil & Gas Operator | Sep 1996 |
| 251 | Woodman & Iannit | | Oil & Gas Operator | Sep 1996 |
| 252 | Younger Energy C | | Oil & Gas Operator | Dec 1996 |
| 253 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 254 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 255 | Zenith Drilling Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 256 | Zinszer Oil Co., Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |