| 201 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 202 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Mar 2025 |
| 203 | Fortune Operating Company | Willis, TX 77378 | Oil & Gas Operator | Mar 2025 |
| 204 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Mar 2025 |
| 205 | Freddy'S Well Service, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 206 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 207 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |
| 208 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 209 | Frio Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 210 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Mar 2025 |
| 211 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 212 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Mar 2025 |
| 213 | Gel Petroleum, Inc. | Bay City, TX 77414 | Oil & Gas Operator | Mar 2025 |
| 214 | Gemarmi Inc. | Cypress, TX 77433 | Oil & Gas Operator | Mar 2025 |
| 215 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 216 | Global XRC Corp | Pittsburg, TX 75686 | Oil & Gas Operator | Mar 2025 |
| 217 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 218 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Mar 2025 |
| 219 | Goliad Operating Company | Houston, TX 77265 | Oil & Gas Operator | Aug 2003 |
| 220 | Goodrich Pet. Co. Of Louisiana | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 221 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 222 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 223 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 224 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 225 | Grimes Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2005 |
| 226 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 227 | Guest Petroleum Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2025 |
| 228 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 229 | Gulfport Oil & Gas Inc. | Gulfport, MS 39501 | Oil & Gas Operator | Mar 2025 |
| 230 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Mar 2025 |
| 231 | GWM Operating Company, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Mar 2025 |
| 232 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 233 | Halbouty, Michel T. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 234 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 235 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 236 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 237 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 238 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 239 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 240 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 241 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 242 | Helis, William G. Co., LLC, The | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2003 |
| 243 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 244 | High Island Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 245 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 246 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 247 | Horizon Prod. And Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 248 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 249 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 250 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 251 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 252 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Mar 2025 |
| 253 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 254 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Mar 2025 |
| 255 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 256 | Hugoton Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 257 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 258 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 259 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 260 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 261 | Hydrocarbon Lease Management LTD | Addison, TX 75001 | Oil & Gas Operator | Jul 2002 |
| 262 | Icarus Operating Corporation | Spring, TX 77393 | Oil & Gas Operator | Mar 2025 |
| 263 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 264 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 265 | Inspire Oil And Gas Inc. | Katy, TX 77449 | Oil & Gas Operator | Mar 2025 |
| 266 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 267 | Ipr USA Corp. | Irving, TX 75039 | Oil & Gas Operator | Jun 2009 |
| 268 | Irish Oil & Gas Co. | Houston, TX 77242 | Oil & Gas Operator | Aug 2003 |
| 269 | JL Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 270 | JMC Resources Corp. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 271 | JMM Energy LLC | Brownsville, TX 78521 | Oil & Gas Operator | Mar 2025 |
| 272 | Joy Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 273 | JSM Natural Resources, L.L.C. | Victoria, TX 77904 | Oil & Gas Operator | Dec 2018 |
| 274 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2025 |
| 275 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 276 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 277 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 278 | Katy Resources LLC | Arlington, TX 76016 | Oil & Gas Operator | Mar 2025 |
| 279 | KD Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 280 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 281 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 282 | Kelly Resources, LTD. | Frisco, TX 75034 | Oil & Gas Operator | Aug 2004 |
| 283 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 284 | Kinder Morgan Tejas Pipeline LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 285 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 286 | Kirkpatrick, John Oil LLC | Victoria, TX 77905 | Oil & Gas Operator | Mar 2025 |
| 287 | Klabzuba Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2013 |
| 288 | Koven Production Co. | San Antonio, TX 78232 | Oil & Gas Operator | Aug 2003 |
| 289 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 290 | Krescent Energy Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2013 |
| 291 | Kristen Oil And Gas, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2025 |
| 292 | KZ Global Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 293 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 294 | Lagarto Company, The | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 1995 |
| 295 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Mar 2025 |
| 296 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Mar 2025 |
| 297 | Layline Energy I LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2019 |
| 298 | Layline Petroleum I, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2013 |
| 299 | Legacy Operating Company, LLC | Dallas, TX 75205 | Oil Operator | Jun 2024 |
| 300 | Legend Natural Gas, LP | Houston, TX 77084 | Oil & Gas Operator | Aug 2004 |