| 401 | Greenwich Oil Corporation | Dallas, TX 75225 | Oil & Gas Operator | Mar 1994 |
| 402 | Greer Exploration Corporation | Shreveport, LA 71118 | Oil & Gas Operator | Jul 2017 |
| 403 | Greer Industries, Inc. | Morgantown, WV 26507-1900 | Gas Operator | Dec 2021 |
| 404 | Gregco, Inc. | Paducah, TX 79248 | Oil & Gas Operator | May 1999 |
| 405 | Gregg Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 406 | Gregory, J. Russell Inc. | Houston, TX 77025 | Gas Operator | Nov 2009 |
| 407 | Greka Am Inc | Santa Maria, CA 93454 | Oil & Gas Operator | May 2013 |
| 408 | Grenadier Energy Partners II,LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2020 |
| 409 | Gresham Oil & Gas (USA) Inc. | Littleton, CO 80122 | Oil & Gas Operator | Jan 1999 |
| 410 | Greta Operating Company LLC | Refugio, TX 78377 | Oil & Gas Operator | Apr 2025 |
| 411 | Grewing, Florence T. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2008 |
| 412 | Grewing, Herman | Muenster, TX 76252 | Oil & Gas Operator | Apr 1997 |
| 413 | Grewing, Herman Operating, Inc. | Muenster, TX 76252 | Oil Operator | Apr 2025 |
| 414 | Grewing, Wayne R. Oil & Gas, LLC | Muenster, TX 76252 | Oil Operator | Apr 2018 |
| 415 | Grey Rider Energy, LLC | Schertz, TX 78154 | Oil & Gas Operator | Apr 2025 |
| 416 | Greylock Conventional, LLC | Charleston, WV 25311 | Oil & Gas Operator | Feb 2025 |
| 417 | Greylock Opco LLC | Charleston, WV 25311 | Oil & Gas Operator | Dec 2024 |
| 418 | Greystone Oil & Gas, LLP | Houston, TX 77057 | Oil & Gas Operator | Dec 2015 |
| 419 | Greystone Petroleum, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 420 | Gribble Oil Corporation | Dallas, TX 75235 | Oil Operator | Aug 1994 |
| 421 | Griffin Energy Holdings, LLC | Plano, TX 75093 | Oil Operator | Apr 2025 |
| 422 | Griffin Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2017 |
| 423 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 424 | Griffin Resources | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2003 |
| 425 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 426 | Griffith, Johnnie R. | O'Fallon, IL 62269 | Oil & Gas Operator | Dec 1996 |
| 427 | Griggs, VIctor C. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 428 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 429 | Grigsby, Jack W. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2002 |
| 430 | Grimes Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2005 |
| 431 | Grimes, Norman W. | Canyon, TX 79015 | Oil & Gas Operator | Jul 2014 |
| 432 | Grissom, Charles A. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2001 |
| 433 | Grit Oil & Gas Management, LLC | Houston, TX 77055 | Oil & Gas Operator | Apr 2025 |
| 434 | Grit Oil & Gas, LLC | Houston, TX 77072 | Oil & Gas Operator | Apr 2019 |
| 435 | Grit Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2023 |
| 436 | Grizzle, Joe B. | Paris, TX 75461 | Oil & Gas Operator | Apr 2025 |
| 437 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 438 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2025 |
| 439 | Gro-Tex Exploration | Abilene, TX 79603 | Oil Operator | Apr 2025 |
| 440 | Gross, Charles E. | Dallas, TX 75220 | Oil & Gas Operator | Feb 2012 |
| 441 | Gross, L. Jack Production | Borger, TX 79008 | Oil & Gas Operator | Dec 1994 |
| 442 | Grothe Bros. | Albany, TX 76430 | Oil & Gas Operator | May 2011 |
| 443 | Grothe Bros., Inc. | Slaton, TX 79364 | Oil & Gas Operator | Apr 2025 |
| 444 | Grothe, M. L. Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jun 2010 |
| 445 | Grothe, M.L. Est. | Slaton, TX 79364 | Oil & Gas Operator | Apr 2025 |
| 446 | Grothues, G B Oil | Natalia, TX 78059 | Oil Operator | Apr 2025 |
| 447 | Grover-McKinney Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 448 | GRS Oil & Gas Company | Irving, TX 75017 | Oil & Gas Operator | Aug 1994 |
| 449 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 450 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 451 | Gryphon Exploration Company | Mandeville, LA 70471 | Oil & Gas Operator | Aug 2009 |
| 452 | GS Energy Of Texas, L.L.C. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2006 |
| 453 | GSF Energy, L.L.C. | Pittsburgh, PA 15220 | Gas Operator | Mar 2018 |
| 454 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | Apr 2025 |
| 455 | GT Productions | Euless, TX 76040 | Oil & Gas Operator | Jan 1997 |
| 456 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Apr 2025 |
| 457 | Guadalupe Properties, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2013 |
| 458 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 459 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 460 | Guffey, Roy, Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2011 |
| 461 | Guffey, WM. R. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2015 |
| 462 | Guidance Oil Developers | Boerne, TX 78006 | Oil & Gas Operator | Apr 2025 |
| 463 | Guidance Oil Developers, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Mar 2008 |
| 464 | Guidance Oil Developers,Inc.(1) | Boerne, TX 78006 | Oil Operator | Apr 2025 |
| 465 | Guidon Energy MGMT Services LLC | Irving, TX 75062 | Oil & Gas Operator | Dec 2020 |
| 466 | Guidry, J.R. | High Island, TX 77623 | Oil Operator | Apr 2025 |
| 467 | Guin, Don L. | Flint, TX 75762 | Oil & Gas Operator | Apr 2018 |
| 468 | Guinn Investments, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2018 |
| 469 | Guinn Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2024 |
| 470 | Guinn Operating Company | Spring Branch, TX 78070 | Oil & Gas Operator | Feb 2014 |
| 471 | Guinn Operating Company, LLC | San Antonio, TX 78260 | Oil Operator | Apr 2025 |
| 472 | Gulf Bend Resources, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2016 |
| 473 | Gulf Central Petroleum Corp. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2025 |
| 474 | Gulf Coast Energy, Co. | Alvin, TX 77511 | Oil & Gas Operator | Apr 2021 |
| 475 | Gulf Coast Fuel Resources LLC | The Woodlands, TX 77380 | Oil Operator | Jan 2022 |
| 476 | Gulf Coast Operations, LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2025 |
| 477 | Gulf Energy Exploration Corp. | Austin, TX 78716 | Gas Operator | Apr 2025 |
| 478 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 479 | Gulf Shore Petro. Oper. Co., Inc | Woodland HLS, CA 91367 | Oil & Gas Operator | Apr 1998 |
| 480 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 481 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 482 | Gulf States Petro. Corp. | Dallas, TX 75202 | Oil & Gas Operator | Apr 2006 |
| 483 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 484 | Gulf Tide Oil Company, The | Houston, TX 77008 | Oil & Gas Operator | Jun 1999 |
| 485 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 486 | Gulfport Oil & Gas Inc. | Gulfport, MS 39501 | Oil & Gas Operator | Apr 2025 |
| 487 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Apr 2025 |
| 488 | Gulftex Energy II, LP | San Antonio, TX 78258 | Oil & Gas Operator | Jan 2013 |
| 489 | Gulftex Energy III, LP | San Antonio, TX 78257 | Oil & Gas Operator | Jul 2018 |
| 490 | Gulftex Energy IV, LP | San Antonio, TX 78257 | Oil & Gas Operator | Jul 2019 |
| 491 | Gulftex Energy, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Apr 2025 |
| 492 | Gulftex Operating Inc | Plano, TX 75093 | Oil & Gas Operator | Apr 2025 |
| 493 | Gungoll, Carl E. Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 494 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 495 | Gunner Energy Corp. | Troy, MI 48083 | Oil & Gas Operator | Jun 1995 |
| 496 | Gunsight Supply Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2003 |
| 497 | Gunsmoke Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2012 |
| 498 | Gupton Gas Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 1994 |
| 499 | Guthrie, A. K. Operating Co. | Big Spring, TX 79720 | Oil & Gas Operator | Mar 1996 |
| 500 | GW Energy, Inc. | Midland, TX 79710 | Oil Operator | Apr 2025 |