| 401 | Fortune-Shelby | | Oil & Gas Operator | Mar 1989 |
| 402 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Feb 2026 |
| 403 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 404 | Four Star Oil Company | | Oil & Gas Operator | May 2015 |
| 405 | Frank B. Aumiller | | Oil Operator | Jun 1991 |
| 406 | Frank Hale | | Oil & Gas Operator | Jan 2025 |
| 407 | Frank S. Moore | | Oil Operator | Feb 1990 |
| 408 | Franks & Duggan | | Oil & Gas Operator | Nov 1987 |
| 409 | Franks & Petrofunds, Inc. | | Oil & Gas Operator | Sep 1989 |
| 410 | Franks - Duggan Et Al | | Oil & Gas Operator | Aug 1989 |
| 411 | Franks Operating Company, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 412 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 413 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 414 | Frog Island, L.L.C. | | Oil Operator | Jan 2025 |
| 415 | FWB Petroleum, Inc. | Euless, TX 76040 | Oil & Gas Operator | Dec 2000 |
| 416 | G & G Rental Service Inc. | | Oil & Gas Operator | Dec 1994 |
| 417 | G & S Oil Company | | Oil & Gas Operator | Dec 2024 |
| 418 | G. R. Goodwill | | Oil & Gas Operator | Jun 1997 |
| 419 | Gaines Energy, L.L.C. | | Oil & Gas Operator | Feb 2015 |
| 420 | Gaines Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 421 | Garfield Operations | San Diego, CA 92101 | Oil & Gas Operator | Oct 1990 |
| 422 | Gary D. Latham | | Oil & Gas Operator | Dec 1988 |
| 423 | Gary D. Latham Oil Company | | Oil Operator | Oct 1984 |
| 424 | Gemini Explorations, Inc. | | Oil & Gas Operator | Jan 2025 |
| 425 | General Oil And Gas Co. | | Oil Operator | Nov 1999 |
| 426 | Geo Matrix Energy Corp. | | Oil Operator | Jan 2025 |
| 427 | George A. Haddad, Jr. | | Oil & Gas Operator | Mar 2000 |
| 428 | George Energy, LLC | | Oil Operator | Dec 2024 |
| 429 | George M. Bagley | | Oil Operator | Dec 2024 |
| 430 | Gishco Petroleum, Inc. | | Oil & Gas Operator | Apr 1992 |
| 431 | Glass Drilling Co. | | Oil Operator | Jan 1987 |
| 432 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 433 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 434 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 435 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 436 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 437 | Goldsberry Rodessa, L.L.C. | | Oil & Gas Operator | Nov 1998 |
| 438 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 439 | GPM, Inc. | | Oil & Gas Operator | Jun 1994 |
| 440 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 441 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 442 | Gray Energy Corporation | | Oil & Gas Operator | May 1987 |
| 443 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 444 | Green Operating | | Oil Operator | Jun 2010 |
| 445 | Green Production, LLC | | Oil & Gas Operator | Dec 2016 |
| 446 | Greer Energy, Inc. | | Oil Operator | Dec 1996 |
| 447 | Grey Oil Co | Pratt, KS 67124 | Oil & Gas Operator | Sep 2007 |
| 448 | Greystone Oil & Gas, LLP | Houston, TX 77057 | Oil & Gas Operator | Dec 2015 |
| 449 | Gribble Oil Company | | Oil & Gas Operator | Jun 1996 |
| 450 | Griffin Energy | | Oil & Gas Operator | May 1991 |
| 451 | Griffin Operating | | Oil & Gas Operator | Mar 1995 |
| 452 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 453 | Grit Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2023 |
| 454 | Gulf Exploration Corporation | Irving, TX 75062 | Oil & Gas Operator | Feb 2026 |
| 455 | Gulf South Minerals, Inc. | | Oil Operator | Nov 1993 |
| 456 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 457 | Gulfstream Of Louisiana, Inc. | | Oil & Gas Operator | Jan 1996 |
| 458 | Guynes And Backus | | Oil Operator | Nov 1999 |
| 459 | H & B Production | | Oil Operator | Mar 1995 |
| 460 | H & H & S Oil Producers | | Oil Operator | Jan 2025 |
| 461 | H & H Oil Co. #1 | | Oil Operator | Jan 2025 |
| 462 | H & H Oil Producers | | Oil & Gas Operator | Jan 2025 |
| 463 | H H H Oil Company | | Oil Operator | Jan 2025 |
| 464 | H. D. McCormick | | Oil & Gas Operator | Jun 2016 |
| 465 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 466 | H. G. Oil Operator | | Oil Operator | Mar 2001 |
| 467 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 468 | H. L. Richey | | Oil & Gas Operator | Sep 1995 |
| 469 | H.E. Sutton, Et Al | | Oil & Gas Operator | Jan 1990 |
| 470 | Haffaday Oil LLC | | Oil Operator | Jan 2025 |
| 471 | Hale Oil | | Oil & Gas Operator | Dec 2024 |
| 472 | Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 473 | Hall Engineering, Inc. | | Oil & Gas Operator | Jan 2007 |
| 474 | Hall-Hargraves, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 475 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 476 | Hardco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 477 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Feb 2026 |
| 478 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 479 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 480 | Hargraves Production, LLC | | Oil Operator | Jan 2025 |
| 481 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 482 | Harrison & Lee | | Oil Operator | Sep 1996 |
| 483 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Feb 2026 |
| 484 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 485 | Hawk Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 486 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 487 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 488 | HDS Production | | Oil Operator | Mar 1998 |
| 489 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 490 | Henergy Oil & Gas LLC | | Oil Operator | Jan 2025 |
| 491 | Herbert J. Schmitz | | Oil & Gas Operator | Dec 1987 |
| 492 | Herbst Resources, Inc. | Mandeville, LA 70448 | Oil & Gas Operator | Aug 2003 |
| 493 | Heritage Energy Company | | Oil & Gas Operator | Jun 2001 |
| 494 | Herman Fields | | Oil & Gas Operator | May 1989 |
| 495 | Herring Production Co | | Oil & Gas Operator | Mar 1992 |
| 496 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 497 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 498 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 499 | Hobbs Oil Co. | | Oil Operator | Dec 1999 |
| 500 | Hobbs Production LLC | | Oil Operator | Mar 2023 |