| 201 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 202 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 203 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 204 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jul 2025 |
| 205 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jul 2025 |
| 206 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 207 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 208 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Jun 2025 |
| 209 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2025 |
| 210 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 211 | England Operating LLC | Littleton, CO 80120-4529 | Oil & Gas Operator | Nov 2014 |
| 212 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 213 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 214 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 215 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 216 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 217 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 218 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 219 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 220 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jul 2025 |
| 221 | Fairchild Well Service Inc | Ponca City, OK 74602-0470 | Oil & Gas Operator | Jun 2006 |
| 222 | Fitzsimmons Randall W & Deborah S | Bartelsville, OK 74006 | Oil & Gas Operator | Jun 2025 |
| 223 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 224 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | May 2025 |
| 225 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 226 | Fossil Creek Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2025 |
| 227 | Four-O-One Corporation | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2015 |
| 228 | Fpco Oil & Gas Co. | New Orleans, LA 70160 | Oil & Gas Operator | Jun 2025 |
| 229 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 230 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 231 | Fugazzi Daniel B | Enid, OK 73703 | Gas Operator | Jun 2025 |
| 232 | Fuksa Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 233 | Fulcrum Exploration, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Jun 2025 |
| 234 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Jun 2025 |
| 235 | G & G Saltwater Disposal Systems Inc | Perry, OK 73077-0854 | Oil Operator | Mar 2005 |
| 236 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 237 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 238 | Ganer Mark Oil & Gas | Owasso, OK 74055 | Oil & Gas Operator | Aug 2005 |
| 239 | Ganer Oil Company | Blackwell, OK 74631-4221 | Oil & Gas Operator | Jan 2022 |
| 240 | Garry Davis Oil LLC | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Jul 2025 |
| 241 | Gear Petroleum Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2009 |
| 242 | Gemini Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 243 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 244 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Oct 2025 |
| 245 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Jun 2025 |
| 246 | Geo American Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 247 | Geo Engineering, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2009 |
| 248 | Geo-Earth Exploration Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | May 1994 |
| 249 | Geyer Brothers Equipment Company | Noble, OK 73068-8540 | Oil & Gas Operator | Mar 2011 |
| 250 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 251 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Jul 2025 |
| 252 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 253 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2025 |
| 254 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 255 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 256 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 257 | Gray Lloyd Energy Inc | Oklahoma City, OK 73120-8112 | Oil & Gas Operator | Nov 2005 |
| 258 | Great Horned Owls, LLC | Katy, TX 77494 | Oil & Gas Operator | Jun 2025 |
| 259 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 260 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 261 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 262 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 263 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 264 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |
| 265 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 266 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 267 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 268 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 269 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 270 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 271 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 272 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Jul 2025 |
| 273 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 274 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 275 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 276 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 277 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Jun 2025 |
| 278 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Jun 2025 |
| 279 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 280 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 281 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 282 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2025 |
| 283 | Hewitt Energy Group, Inc. | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 284 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 285 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 286 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 287 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Jun 2025 |
| 288 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 289 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 290 | Hoke Jr J T | Edmond, OK 73034 | Oil Operator | Nov 1998 |
| 291 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 292 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 293 | Hoyt Oil & Gas LLC | Cushing, OK 74023-0442 | Oil & Gas Operator | Jul 2025 |
| 294 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 295 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 296 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jul 2025 |
| 297 | Ike Energy LLC | Stillwater, OK 74074-1745 | Oil & Gas Operator | Jul 2025 |
| 298 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 299 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 300 | International Energy Company LLC | Tulsa, OK 74136-3922 | Oil & Gas Operator | Jul 2025 |