| 201 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 202 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 203 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 204 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 205 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 206 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 207 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 208 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2024 |
| 209 | Express Oil & Gas LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 210 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 211 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 212 | Fairway Midstream SVC & TRD | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2006 |
| 213 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Dec 2024 |
| 214 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 215 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 216 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 217 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 218 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 219 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 220 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 221 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 222 | Fossil Creek Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2025 |
| 223 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 224 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 225 | Frontier Energy Serv LLC | Enid, OK 73702-1187 | Oil & Gas Operator | Jun 2016 |
| 226 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Mar 2025 |
| 227 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 228 | Gala Resources, LTD. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 229 | Garrison Bros Pipe & Used Equip Inc | Hinton, OK 73047 | Oil & Gas Operator | Aug 2013 |
| 230 | Gas Development Corp. | Broken Arrow, OK 74012 | Oil & Gas Operator | Mar 2015 |
| 231 | Gasanadarko LTD | Oklahoma City, OK 73116 | Gas Operator | May 1994 |
| 232 | Gemini Exploration Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | May 2013 |
| 233 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 234 | General Exploration Inc | | Oil & Gas Operator | Aug 2001 |
| 235 | Geo American Resources Inc | Tulsa, OK 74130-1575 | Oil & Gas Operator | Dec 2024 |
| 236 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 237 | GHK Company LLC (The) | Oklahoma City, OK 73118-1120 | Oil & Gas Operator | Apr 2018 |
| 238 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 239 | Golden Gas Energies Inc | | Oil & Gas Operator | Jan 1999 |
| 240 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2024 |
| 241 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Jan 2025 |
| 242 | Grace Petroleum LP | Midland, TX 79708 | Oil & Gas Operator | May 2016 |
| 243 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2025 |
| 244 | Great Western Land Co Inc | Tulsa, OK 74136-1517 | Oil & Gas Operator | Jun 2000 |
| 245 | Green River Exploration Co | Tulsa, OK 74121-1468 | Oil & Gas Operator | Sep 2011 |
| 246 | H & H Star Energy Inc | Traverse City, MI 49684 | Oil & Gas Operator | Aug 2016 |
| 247 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 248 | Halcon Holdings, Inc. | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 249 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Dec 2024 |
| 250 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 251 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2025 |
| 252 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Dec 2024 |
| 253 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 254 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Jan 2025 |
| 255 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 256 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 257 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2024 |
| 258 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 259 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 260 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 261 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 262 | Highland Energy Co | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 263 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 264 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 265 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 266 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 267 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 268 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 269 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 270 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 271 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 272 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 273 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 274 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 275 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 276 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 277 | Hunt, H L | Dallas, TX 75202-2785 | Oil & Gas Operator | Feb 2020 |
| 278 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 279 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2025 |
| 280 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 281 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 282 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 283 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 284 | Iron Sights Operating Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 285 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | Mar 2025 |
| 286 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Jan 2025 |
| 287 | JBC Operating LLC | Foyil, OK 74031-0310 | Oil & Gas Operator | Jul 2016 |
| 288 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Dec 2024 |
| 289 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 290 | Jim Clower Inc | Beaver, OK 73932 | Oil & Gas Operator | Dec 2024 |
| 291 | Jma Energy Company, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2025 |
| 292 | Jma Resources, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2025 |
| 293 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2024 |
| 294 | Jones, L. E. Production Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2014 |
| 295 | K M Gas Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2014 |
| 296 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 297 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Dec 2024 |
| 298 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 299 | KCS Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 300 | Kechi Energy LLC | Chickasha, OK 73018 | Oil & Gas Operator | Dec 2024 |