| 201 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 202 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 203 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 204 | F & M Oil & Gas Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 205 | Falcon Production Co. | Floresville, TX 78114 | Oil & Gas Operator | May 2025 |
| 206 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 207 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 208 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 209 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 210 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 211 | Ffa Petroleum Services, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2018 |
| 212 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2025 |
| 213 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 214 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 215 | Fletcher Operating, LLC | Fairhope, AL 36532 | Oil & Gas Operator | May 2025 |
| 216 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 217 | Forbes, C. C. Company | Alice, TX 78333 | Oil & Gas Operator | Sep 2015 |
| 218 | Forbes, Charles C. | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2011 |
| 219 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 220 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 221 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 222 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Feb 2025 |
| 223 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 224 | Frio Engineering Inc. | Houston, TX 77066 | Oil & Gas Operator | May 2025 |
| 225 | Frio Production Co. | Alice, TX 78333 | Oil & Gas Operator | Sep 1998 |
| 226 | Frost, C.M., P.M. & V.W. | Simonton, TX 77476 | Oil & Gas Operator | Feb 2000 |
| 227 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 228 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 229 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 230 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 231 | Gierhart Exploration, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 1994 |
| 232 | Go-Energy Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2002 |
| 233 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 234 | Goldsmith, J. Paul | Tyler, TX 75711 | Oil & Gas Operator | Feb 1997 |
| 235 | Gonzalez, Elia G. Mineral Trust | Laredo, TX 78041 | Oil & Gas Operator | May 2012 |
| 236 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 237 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 238 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | May 2025 |
| 239 | Grimes Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2005 |
| 240 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 241 | Haigood, Danny | Portland, TX 78374 | Oil & Gas Operator | Mar 2008 |
| 242 | Hamill Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1999 |
| 243 | Hamilton, J. R. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | May 2025 |
| 244 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 245 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 246 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 247 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 248 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 249 | Hawk Exploration And Production | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Oct 1995 |
| 250 | Hawk Petroleum, L L C | San Diego, TX 78384 | Oil & Gas Operator | May 2025 |
| 251 | Hawn Bros. & Venus Oil Co. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 252 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 253 | Hawn Brothers Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jan 2003 |
| 254 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 255 | Henderson, Peter Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2020 |
| 256 | Herschap Bros. | Bruni, TX 78344 | Oil & Gas Operator | May 2025 |
| 257 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 258 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 259 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 260 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 261 | Hinds Petroleum, LLC | Houston, TX 77263 | Oil Operator | May 2025 |
| 262 | Hinds Petroleum, LP | Houston, TX 77263 | Oil Operator | Feb 2017 |
| 263 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 264 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 265 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 266 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 267 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 268 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 269 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 270 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | May 2025 |
| 271 | Hugoton Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 272 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 273 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 274 | Hydrocarbon Horizons, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2023 |
| 275 | Hydrocarbon Operating, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 276 | Icarus Operating Corporation | Spring, TX 77393 | Oil & Gas Operator | May 2025 |
| 277 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 278 | Impetro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2020 |
| 279 | Ipact | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 280 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | May 2025 |
| 281 | Jalapeno Operating Company, LLC | Plntersville, TX 77363 | Oil Operator | May 2025 |
| 282 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 283 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 284 | Jay-Dee Operating Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Aug 2000 |
| 285 | Je Energy Partners, LLC | Alice, TX 78333 | Oil Operator | May 2025 |
| 286 | Jenco Petroleum Corporation | The Woodlands, TX 77380 | Oil Operator | May 2025 |
| 287 | Jenex Operating Company Of Texas | Denver, CO 80209 | Oil & Gas Operator | Aug 2003 |
| 288 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 289 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 290 | Ji Energy LLC | Midland, TX 79707 | Gas Operator | May 2025 |
| 291 | Joe Kestner, L.L.C. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Feb 2016 |
| 292 | Jones, R. W. & Co., LTD. | Oklahoma City, OK 73132 | Oil & Gas Operator | Mar 1997 |
| 293 | Jones, R.W. & Co. II, LTD. | Edmond, OK 73034 | Oil & Gas Operator | Sep 2010 |
| 294 | JRG Exploration, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Jul 2015 |
| 295 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 296 | Kasan Corp. | Pharr, TX 78577 | Oil & Gas Operator | Sep 1995 |
| 297 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 298 | Keen Operating Company, Inc. | Austin, TX 78705 | Oil & Gas Operator | Aug 2001 |
| 299 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 300 | Kenne Exploration, Inc. | Missouri City, TX 77489 | Oil & Gas Operator | May 2025 |