| 301 | GPH Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 2008 |
| 302 | Grace 7 Operating LLC | Argyle, TX 76226 | Oil Operator | Apr 2022 |
| 303 | Grace 7 Properties, LTD. | Argyle, TX 76226 | Oil & Gas Operator | Sep 2025 |
| 304 | Grace Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Oct 2011 |
| 305 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 306 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | Sep 2025 |
| 307 | Grace Petroleum, L.P. | Midland, TX 79708 | Oil & Gas Operator | May 2016 |
| 308 | Grace, Jack Production Co, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 2025 |
| 309 | Grace, Jack, Prod. Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 1997 |
| 310 | Grace, Pete | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 1996 |
| 311 | Graham Cementing Company | Graham, TX 76450 | Oil & Gas Operator | Jan 2022 |
| 312 | Graham Energy LTD | Houston, TX 77024 | Oil & Gas Operator | Mar 1994 |
| 313 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 314 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 315 | Graham, H.E. | Imperial, TX 79743 | Oil & Gas Operator | Mar 2007 |
| 316 | Graham, Tom Drilling Co. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 317 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 318 | Grahamsource Corp. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 319 | Grain Makers Oil Co., LLC | Canyon, TX 79015 | Oil & Gas Operator | Sep 2025 |
| 320 | Grama Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2025 |
| 321 | Grammer, John, Oil Account | La Vernia, TX 78121 | Oil & Gas Operator | Aug 2017 |
| 322 | Gramrich Oil & Gas Corporation | Coppell, TX 75019 | Oil & Gas Operator | Oct 2012 |
| 323 | Grand Banks Energy Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 324 | Grand Energy, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2002 |
| 325 | Grand Gulf Production, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 326 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 327 | Grand Petroleum Co. | Pampa, TX 79065 | Oil & Gas Operator | Jul 2017 |
| 328 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Sep 2025 |
| 329 | Grandfield Consulting, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2011 |
| 330 | Granite Crossing, LLC | Austin, TX 78716 | Oil Operator | Sep 2025 |
| 331 | Granite Oil Company | Austin, TX 78716 | Oil & Gas Operator | Nov 2000 |
| 332 | Granite Operating Company | Houston, TX 77056 | Oil & Gas Operator | Nov 2012 |
| 333 | Granitebay Operating, Inc. | Borger, TX 79008 | Oil & Gas Operator | Sep 2025 |
| 334 | Grant Resources, LLC | Ennis, TX 75120 | Oil Operator | Sep 2025 |
| 335 | Grant, Elmer D., Estate Of | Wichita Falls, TX 76302 | Oil Operator | Sep 2025 |
| 336 | Grasen Energy, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Aug 2013 |
| 337 | Grasha, Matthew P. | Midland, TX 79709 | Oil & Gas Operator | Feb 1995 |
| 338 | Graves Operating | Perryton, TX 79070 | Oil & Gas Operator | Jul 2005 |
| 339 | Graves Operating, LLC | Perryton, TX 79070 | Oil & Gas Operator | Sep 2025 |
| 340 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2025 |
| 341 | Gray Fox Operating Company | Tulsa, OK 74119 | Oil Operator | May 1993 |
| 342 | Gray Oil & Gas Inc. | Abilene, TX 79606 | Oil & Gas Operator | Oct 2013 |
| 343 | Gray Operating Company, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2018 |
| 344 | Gray Production Trust | Dallas, TX 75261 | Oil & Gas Operator | Jul 2003 |
| 345 | Gray, Gordon Operator | Snyder, TX 79550 | Oil & Gas Operator | Sep 2025 |
| 346 | Gray, Mark W. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2003 |
| 347 | Gray, Robert Leon | FT Stockton, TX 79735 | Oil & Gas Operator | Feb 2000 |
| 348 | Gray, W. H. Operating | Odessa, TX 79762 | Oil Operator | Sep 2025 |
| 349 | Grayhawk Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2006 |
| 350 | Grayrock Corp., The | Dallas, TX 75243 | Oil & Gas Operator | Dec 1999 |
| 351 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2025 |
| 352 | Grayson Petroleum Company | Whitesboro, TX 76273 | Oil & Gas Operator | Sep 2025 |
| 353 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | Sep 2025 |
| 354 | Graystone Exploration Corp. | Garland, TX 75043 | Oil & Gas Operator | Aug 2003 |
| 355 | GRB Properties, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2003 |
| 356 | Greasewood Oil Company | Midland, TX 79705 | Oil & Gas Operator | Jul 2007 |
| 357 | Great American Resources Inc. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 358 | Great Basin Petroleum Serv, Inc. | Odessa, TX 79765 | Oil & Gas Operator | Nov 2002 |
| 359 | Great Basin Petroleum Serv, L.P. | Odessa, TX 79765 | Oil & Gas Operator | Jul 2008 |
| 360 | Great Basin Well Service Corp. | Odessa, TX 79765 | Oil & Gas Operator | Feb 2025 |
| 361 | Great Bay Operations, LLC | Portsmouth, NH 03801 | Oil & Gas Operator | Nov 2016 |
| 362 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 363 | Great Plains Operating, LLC. | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2014 |
| 364 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Apr 2025 |
| 365 | Great Plains Resources, Inc. | Nixon, TX 78140 | Oil & Gas Operator | Sep 2025 |
| 366 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Sep 2025 |
| 367 | Great West Energy & Expl., Inc. | Addison, TX 75001 | Oil & Gas Operator | Mar 2008 |
| 368 | Great West Operating Co., Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 369 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 370 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 371 | Greco Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 372 | Greco Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 373 | Greehey & Company, LTD. | San Antonio, TX 78216 | Oil & Gas Operator | May 2020 |
| 374 | Green Century Exp & Prod, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 375 | Green Exploration Company | Austin, TX 78711 | Oil & Gas Operator | Sep 2025 |
| 376 | Green Light Operating, LLC. | Austin, TX 78746 | Oil Operator | Sep 2025 |
| 377 | Green Oil & Gas, Inc. | Winters, TX 79567 | Oil & Gas Operator | Aug 2003 |
| 378 | Green Petroleum Company | Archer City, TX 76351 | Oil & Gas Operator | Nov 1996 |
| 379 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Sep 2025 |
| 380 | Green Star | Somerset, TX 78069 | Oil Operator | Sep 2025 |
| 381 | Green, Hugh | Albany, TX 76430 | Oil & Gas Operator | Apr 2012 |
| 382 | Green, Michael Oil | Albany, TX 76430 | Oil Operator | Sep 2025 |
| 383 | Green, Roy W. Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2021 |
| 384 | Greenbriar Energy Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2004 |
| 385 | Greenbrier Oper. Co. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2001 |
| 386 | Greene, R. E. | Baird, TX 79504 | Oil & Gas Operator | Jun 2009 |
| 387 | Greene, Vernon | Levelland, TX 79336 | Oil & Gas Operator | May 2002 |
| 388 | Greenhaw, Morris R Oil & Gas Inc | Desdemona, TX 76445 | Oil & Gas Operator | May 2006 |
| 389 | Greenhaw, Morris R. | Desdemona, TX 76445 | Oil & Gas Operator | Sep 2025 |
| 390 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 391 | Greenlake Energy Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Sep 2025 |
| 392 | Greenlight Enterprises LLC | McKinney, TX 75072 | Oil Operator | Sep 2025 |
| 393 | Greenstone Energy, LLC | Houston, TX 77208 | Oil Operator | Sep 2025 |
| 394 | Greenville Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1996 |
| 395 | Greenwerks Outdoor Services LLC | Stockdale, TX 78160 | Oil Operator | Sep 2025 |
| 396 | Greenwich Oil Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 1994 |
| 397 | Greer Exploration Corporation | Shreveport, LA 71118 | Oil & Gas Operator | Jul 2017 |
| 398 | Greer Industries, Inc. | Morgantown, WV 26507-1900 | Gas Operator | Dec 2021 |
| 399 | Gregco, Inc. | Paducah, TX 79248 | Oil & Gas Operator | May 1999 |
| 400 | Gregg Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |