| 201 | Ram Oil & Gas | Blackwell, OK 74631 | Oil & Gas Operator | May 2013 |
| 202 | Raney Oil Company, LLC | Lawrence, KS 66049 | Oil & Gas Operator | May 2026 |
| 203 | Range Oil Compan | | Oil & Gas Operator | Nov 1995 |
| 204 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | May 2026 |
| 205 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 206 | Reach Group-Reac | | Oil & Gas Operator | Apr 1995 |
| 207 | Redbud Oil & Gas Operating, LLC | Spring, TX 77379 | Oil & Gas Operator | May 2026 |
| 208 | Rine Exploration Co. | | Oil Operator | Jul 1988 |
| 209 | Robinowitz Oil Company, A General Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2023 |
| 210 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 211 | Rockin 'A' Oil | | Oil Operator | May 2026 |
| 212 | Samson Resources | | Oil Operator | Jan 1994 |
| 213 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Sep 2026 |
| 214 | Schulein Company LLC | Denver, CO 80246 | Oil & Gas Operator | Apr 2026 |
| 215 | Schulein Robert | | Oil & Gas Operator | Dec 1995 |
| 216 | Seed Group/Aa Drilling | | Oil Operator | Oct 2009 |
| 217 | Seydell, E. Morris | Wichita Falls, TX 76307 | Oil Operator | Feb 1993 |
| 218 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2026 |
| 219 | Sharp Engineerin | | Oil Operator | Aug 1995 |
| 220 | Short W D Oil Co | | Oil Operator | Mar 1996 |
| 221 | Sierra Drilling | | Oil Operator | Sep 1988 |
| 222 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Apr 2026 |
| 223 | SLMW Energy Comp | | Oil Operator | Jan 1989 |
| 224 | SNR Kansas Operating, LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2019 |
| 225 | SNR Operating, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2026 |
| 226 | Source Energy Midcon LLC | Highlands Ranch, CO 80129 | Oil Operator | Jul 2015 |
| 227 | Source Petroleum | Wichita, KS 67202 | Oil & Gas Operator | Oct 1993 |
| 228 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Sep 2026 |
| 229 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | May 2026 |
| 230 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 231 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 232 | Stratex Oil & Gas Holdings, Inc. | Watertown, CT 06795 | Oil Operator | Jun 2015 |
| 233 | T & W Ward Oil LLC | Blackwell, OK 74631 | Oil Operator | Jun 2026 |
| 234 | Tamoil | | Oil Operator | May 2017 |
| 235 | Taos Resources Operating Co LLC | Houston, TX 77037 | Oil & Gas Operator | Dec 2019 |
| 236 | Te-Pe Oil & Gas | | Oil & Gas Operator | May 2026 |
| 237 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 238 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Jun 2026 |
| 239 | Three Bros. Energy, Inc. | Ponca City, OK 74601 | Gas Operator | Dec 2013 |
| 240 | Thresher Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2026 |
| 241 | Tomlinson Operating, LLC | Ketchum, ID 83340 | Oil & Gas Operator | Oct 2014 |
| 242 | Tomlinson, Sid | Hays, KS 67601 | Oil & Gas Operator | Sep 2002 |
| 243 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 244 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 245 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | Jul 2026 |
| 246 | United Meridian | | Oil Operator | Dec 1992 |
| 247 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 248 | Vail Energy/Enma | | Oil Operator | Oct 1987 |
| 249 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 250 | Vanmax Explorati | | Oil Operator | Nov 1995 |
| 251 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 252 | Viking Petroleum | | Oil Operator | Mar 1990 |
| 253 | Vincent Oil Corp | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 254 | Vintage Petroleu | | Oil & Gas Operator | Dec 1995 |
| 255 | Vitruvian Exploration LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2016 |
| 256 | W.D. Short Oil Co., LLC | Oxford, KS 67119 | Oil & Gas Operator | May 2026 |
| 257 | Walcher, Wayne E. | Wichita, KS 67202 | Oil & Gas Operator | May 2024 |
| 258 | Watson Petroleum | | Oil & Gas Operator | Feb 1990 |
| 259 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Jul 2026 |
| 260 | Wheatland Oil & | | Oil & Gas Operator | Aug 1984 |
| 261 | White & Ellis Drilling, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 262 | Woods Oil | | Oil Operator | May 2026 |
| 263 | Yearout, Dwain L. | South Haven, KS 67140 | Oil Operator | Apr 2026 |
| 264 | Younger Energy C | | Oil & Gas Operator | Dec 1996 |