| 201 | Fenn, Bill Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2008 |
| 202 | Ferguson Oil & Gas Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 203 | Ferguson-Burns Leasing Co. | Rockdale, TX 76567 | Oil & Gas Operator | Oct 2007 |
| 204 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Apr 2025 |
| 205 | First Rock, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 206 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 207 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2025 |
| 208 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 209 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 210 | Fortune Operating Company | Willis, TX 77378 | Oil & Gas Operator | Apr 2025 |
| 211 | Fortune Operating, Inc. | Bowling Green, KY 42104 | Oil & Gas Operator | Apr 2025 |
| 212 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 213 | Foxborough Energy Company, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 214 | Freedom Energy, Inc. (I) | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2003 |
| 215 | Freedom Energy, LTD. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jun 2011 |
| 216 | Frio Oil & Gas, LTD. | Austin, TX 78731 | Oil Operator | Apr 2025 |
| 217 | Fulcrum Energy Operating, LLC | Denver, CO 80206 | Oil & Gas Operator | Apr 2025 |
| 218 | Gemini Exploration Company | Dallas, TX 75219 | Oil & Gas Operator | Mar 1997 |
| 219 | Genesis Well Service | Colleyville, TX 76034 | Oil Operator | Apr 2025 |
| 220 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 221 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 222 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2025 |
| 223 | Ginger Petroleum Company, Inc. | La Grange, TX 78945 | Oil & Gas Operator | Apr 2025 |
| 224 | Glenco Oil & Gas Company | Seguin, TX 78155 | Oil & Gas Operator | Dec 1994 |
| 225 | Glenn, Wayne E. & Assoc., Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jun 2005 |
| 226 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 227 | Global Drilling, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 228 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 229 | Go-Energy Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2002 |
| 230 | Golden Child, Inc. | San Antonio, TX 78213 | Oil & Gas Operator | Apr 2025 |
| 231 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 232 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 233 | Gouger Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 234 | Gould Energy Co. | Owasso, OK 74055 | Oil & Gas Operator | Mar 2005 |
| 235 | Great West Energy & Expl., Inc. | Addison, TX 75001 | Oil & Gas Operator | Mar 2008 |
| 236 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 237 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 238 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 239 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 240 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Apr 2025 |
| 241 | H & H Petroleum, LLC | San Antonio, TX 78213 | Oil Operator | Apr 2025 |
| 242 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 243 | Haass Ranch Oil Company, LLC | Castroville, TX 78009 | Oil Operator | Apr 2025 |
| 244 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 245 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 246 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Jan 2025 |
| 247 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 248 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Apr 2025 |
| 249 | Hat Creek Energy LLC | Denver, CO 80209 | Oil & Gas Operator | Jun 2019 |
| 250 | Hawthorn Energy Partners, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 251 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 252 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 253 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 254 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 255 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 256 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 257 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | Apr 2025 |
| 258 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 259 | Holloway Oil Company | Austin, TX 78764 | Oil & Gas Operator | Feb 2004 |
| 260 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Apr 2025 |
| 261 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Apr 2025 |
| 262 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 263 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 264 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 265 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 266 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 267 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 268 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 269 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Apr 2025 |
| 270 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 271 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 272 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 273 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 274 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 275 | Ineos USA Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 276 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 277 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2025 |
| 278 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Apr 2025 |
| 279 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Apr 2025 |
| 280 | Jab Operating, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2008 |
| 281 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 282 | Jay-Dee Operating Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Aug 2000 |
| 283 | JB Oil & Gas Well Service | Dilley, TX 78017 | Oil & Gas Operator | Apr 2025 |
| 284 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 285 | Jenco Petroleum Corporation | The Woodlands, TX 77380 | Oil Operator | Apr 2025 |
| 286 | Jenex Operating Company Of Texas | Denver, CO 80209 | Oil & Gas Operator | Aug 2003 |
| 287 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 288 | Jenkins Oil Corporation | Hankamer, TX 77560 | Oil & Gas Operator | Mar 2008 |
| 289 | Jin Petroleum LLC | New Braunfels, TX 78130 | Oil Operator | Apr 2025 |
| 290 | JM Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | Apr 2025 |
| 291 | Johnson Sanford Op Co., LTD | Leander, TX 78641 | Oil & Gas Operator | Apr 2025 |
| 292 | Joy Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2025 |
| 293 | K2 Petroleum, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Apr 2025 |
| 294 | Kain Petroleum Company | Pearsall, TX 78061 | Gas Operator | May 2011 |
| 295 | Kain Petroleum, LLC | Pearsall, TX 78061 | Oil & Gas Operator | Apr 2025 |
| 296 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Apr 2025 |
| 297 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 298 | Keahey Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2002 |
| 299 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 300 | Keft Oil Company | Pleasanton, TX 78064 | Oil & Gas Operator | Feb 2003 |