| 201 | Red Hills Resources, Inc. | Englewood, KS 67840 | Oil & Gas Operator | Mar 2025 |
| 202 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 203 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 204 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 205 | Ritchie Exploration | | Oil Operator | Aug 1995 |
| 206 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Mar 2025 |
| 207 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 208 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 209 | Rosel Energy, Inc. | Liberal, KS 67901 | Oil & Gas Operator | Jul 2004 |
| 210 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 211 | Sabine Productio | | Oil & Gas Operator | Mar 1994 |
| 212 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 213 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 214 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 215 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 216 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 217 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Mar 2025 |
| 218 | Shaw George R | | Oil & Gas Operator | Mar 1992 |
| 219 | Sho-Bar Energy I | | Oil & Gas Operator | Jan 1991 |
| 220 | Sho-Bar Energy, Inc. | Harper, KS 67058 | Oil & Gas Operator | Apr 2025 |
| 221 | Sidwell Oil & Ga | | Oil & Gas Operator | May 1993 |
| 222 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 223 | Siegfried R H In | | Oil Operator | Apr 1985 |
| 224 | Sierra Petroleum | | Oil & Gas Operator | Sep 1986 |
| 225 | Snyder Partners, General Partnership | Cody, WY 82414 | Oil & Gas Operator | Jul 2019 |
| 226 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 227 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 228 | Southwest Gas Storage Company | | Gas Operator | Mar 2025 |
| 229 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2025 |
| 230 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2025 |
| 231 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 232 | Sunfire Energy | | Oil & Gas Operator | Mar 2025 |
| 233 | SW Gas Stge | | Gas Operator | Oct 2015 |
| 234 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 235 | T-Y Development Corp | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 236 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 237 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | May 2025 |
| 238 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 239 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 240 | Three-D Resources, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Mar 2025 |
| 241 | Tko Investments, Inc. | Dodge City, KS 67801 | Oil & Gas Operator | Mar 2025 |
| 242 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | May 2025 |
| 243 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 244 | Triple T Resources, LP | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 245 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 246 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 247 | Upland Resources, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Dec 2009 |
| 248 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 249 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 250 | Vastar Resources | | Oil & Gas Operator | Dec 1996 |
| 251 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 252 | Vess-Transpacific Operating Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | May 2024 |
| 253 | Viking Resources, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Jul 2025 |
| 254 | Walker Corporation (The) | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 255 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 256 | West Plains Enterprises, Inc | Plains, KS 67869 | Oil & Gas Operator | Sep 2022 |
| 257 | Whitaker Enterpr | | Oil Operator | Oct 1992 |
| 258 | White Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Mar 2025 |
| 259 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 260 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 261 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |
| 262 | Zinke & Trumbo L | | Oil & Gas Operator | Nov 2000 |