| 501 | FMD Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2020 |
| 502 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 503 | FMR Services Inc. | | Gas Operator | Dec 2011 |
| 504 | Fna Oil Company, LLC | Richfield, KS 67953 | Gas Operator | Sep 2025 |
| 505 | Fne Operating LLC | | Oil Operator | Dec 2024 |
| 506 | Fo Energy LLC | Canton, OH 44718 | Oil & Gas Operator | Dec 2024 |
| 507 | Foag, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2022 |
| 508 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 509 | Fod Oil Company | | Oil Operator | May 1999 |
| 510 | Foggy Bottom Farms, LLC | Bowling Green, KY 42101 | Oil Operator | Dec 2023 |
| 511 | Fola Land Company Inc | | Gas Operator | Dec 2003 |
| 512 | Folk Oil | | Oil Operator | Dec 2009 |
| 513 | Follett Operating Co. | Darrouzett, TX 79024 | Oil & Gas Operator | Jun 2019 |
| 514 | Foltz & Foltz LTD Partnership | Robertsville, OH 44670 | Oil & Gas Operator | Dec 2018 |
| 515 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 516 | Fontenot Pet Land Services, Inc. | | Oil & Gas Operator | Aug 2002 |
| 517 | Foothill Energy, LLC | Spring, TX 77393 | Oil & Gas Operator | Dec 2025 |
| 518 | Foothills Energy LLC | Seabrook, TX 77586-3541 | Gas Operator | Feb 2013 |
| 519 | Foothills Texas, Inc. | Houston, TX 77269 | Oil & Gas Operator | Aug 2019 |
| 520 | Fora Company | Borger, TX 79007 | Oil & Gas Operator | Dec 2025 |
| 521 | Forbes Harold G | | Oil Operator | Dec 1984 |
| 522 | Forbes Producing, LLC | Corpus Chrsti, TX 78410 | Oil Operator | Sep 2025 |
| 523 | Forbes, C. C. Company | Alice, TX 78333 | Oil & Gas Operator | Sep 2015 |
| 524 | Forbes, Charles C. | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2011 |
| 525 | Forbes, Patrick T. | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 526 | Force 4 Energy Resources, Inc. | Austin, TX 78733 | Oil & Gas Operator | Aug 2005 |
| 527 | Force 5 Energy, LLC | Houston, TX 77090 | Oil & Gas Operator | Dec 2018 |
| 528 | Force Antrim Development Inc | | Gas Operator | Dec 1999 |
| 529 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 530 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 531 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 532 | Ford Chapman & Assoc | Midland, TX 79710 | Oil Operator | Sep 2000 |
| 533 | Ford Energy Corporation | Chickasha, OK 73018 | Oil & Gas Operator | Nov 2025 |
| 534 | Ford Gum & Machine Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 535 | Ford Roger & Marjorie | Fowler, OH 44418 | Gas Operator | Dec 1993 |
| 536 | Ford Tank Truck Service | | Oil Operator | Jan 2022 |
| 537 | Ford, Cregg | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 538 | Ford, Don H. & Assoc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 539 | Ford, R. J. Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 540 | Fordoche Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 541 | Fordyce Oil & Gas | Sullivan City, TX 78595 | Oil & Gas Operator | Jul 2022 |
| 542 | Fore Oil, LLC | Manvel, TX 77578 | Oil Operator | May 2021 |
| 543 | Foree Oil Company | Terrell, TX 75160 | Oil & Gas Operator | Dec 2025 |
| 544 | Foree R L | Dallas, TX 75225 | Oil & Gas Operator | Aug 2001 |
| 545 | Foree, R. L. Trust "A" | Dallas, TX 75225 | Oil & Gas Operator | Dec 1999 |
| 546 | Foreland Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Oct 2021 |
| 547 | Foreland Resources LLC | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 548 | Forell Energy Company | Fullerton, CA 92838 | Oil Operator | Dec 2023 |
| 549 | Foreman Enterprises Inc | Edmond, OK 73003 | Oil & Gas Operator | Oct 2025 |
| 550 | Foreman Joy | Guymon, OK 73942-3159 | Oil & Gas Operator | Jan 2003 |
| 551 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 552 | Forest Gray Energy | | Oil & Gas Operator | Oct 2025 |
| 553 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 554 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 555 | Forestar Group Inc | | Oil Operator | Sep 2015 |
| 556 | Forestar Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 557 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 558 | Forexco, Inc. | Greensboro, NC 27438 | Oil & Gas Operator | Dec 2020 |
| 559 | Forge Energy Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 560 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |
| 561 | Fork Run Oil & Gas LLC | Sheffield, PA 16347-0012 | Oil & Gas Operator | Dec 2024 |
| 562 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 563 | Forman Petroleum Corporation | | Oil & Gas Operator | Aug 2001 |
| 564 | Formation Mechan | | Oil Operator | Dec 1986 |
| 565 | Formation Recovery LLC | Weatherford, TX 76087 | Oil & Gas Operator | Dec 2025 |
| 566 | Formation Resources LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Dec 2025 |
| 567 | Formax Oil Company | | Oil & Gas Operator | Dec 1993 |
| 568 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 569 | Formentera Opr LLC | Austin, TX 78701-4889 | Gas Operator | Nov 2025 |
| 570 | Formholtz, Allen | Lakeview, NY 14085 | Gas Operator | Dec 2024 |
| 571 | Formor Operating Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2013 |
| 572 | Fornash Oil LLC | Waynesburg, OH 44688 | Oil & Gas Operator | Dec 2024 |
| 573 | Forney & McCombs | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 574 | Forney Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 575 | Forrest A Ward | Okmulgee, OK 74447-8891 | Oil & Gas Operator | Jul 2025 |
| 576 | Forrest Energy, LLC | Hattiesburg, MS 39401 | Oil & Gas Operator | Feb 1998 |
| 577 | Forrest Exploration & Dev, LLC | | Gas Operator | May 2003 |
| 578 | Forrest Richard E | New Bethlehem, PA 16242-2547 | Gas Operator | Dec 2019 |
| 579 | Forrest, Catherine M | | Oil & Gas Operator | Apr 2025 |
| 580 | Forrestel II, E. Peter | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 581 | Forrester Oil & Gas Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 582 | Forrester, J. L. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 583 | Forsan Oil Company | Forsan, TX 79733 | Oil & Gas Operator | Jul 2008 |
| 584 | Forster Oil Co. | | Oil & Gas Operator | Dec 2016 |
| 585 | Forster, Fred Jr. | Midland, TX 79705 | Oil & Gas Operator | Aug 2008 |
| 586 | Forsythe Lawana | Wilson, OK 73463 | Oil Operator | Mar 2020 |
| 587 | Forsythe Trucking Inc | Wilson, OK 73463 | Oil & Gas Operator | Oct 2025 |
| 588 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Dec 2025 |
| 589 | Fort Exploration Company | FT Smith, AR 72901 | Gas Operator | May 2001 |
| 590 | Fort Operating Company | Fort Smith, AR 72923 | Gas Operator | Nov 2018 |
| 591 | Fort Scott Methane Partners, LCC | Denver, CO 80218 | Gas Operator | Dec 2014 |
| 592 | Fort Worth Natural Gas, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Dec 2025 |
| 593 | Fort Worth Production Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 1996 |
| 594 | Fortay Inc. | Sunray, TX 79086 | Oil & Gas Operator | Dec 2025 |
| 595 | Forte Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Dec 2010 |
| 596 | Forte Energy Corpration | Houston, TX 77024-1209 | Oil & Gas Operator | Jan 1995 |
| 597 | Fortenberry Operating Co., Inc | | Oil & Gas Operator | Nov 2003 |
| 598 | Fortenbery Drilling Co., Inc. | | Oil & Gas Operator | Oct 1979 |
| 599 | Fortenbery Operating Co Inc | | Oil & Gas Operator | May 1993 |
| 600 | Fortenbery Wade | | Oil & Gas Operator | May 1980 |