| 501 | Flusche, Herb | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2005 |
| 502 | Flux Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Feb 2026 |
| 503 | Flying Diamond Oil Corp | | Oil & Gas Operator | Dec 1983 |
| 504 | Flying J Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Jul 1995 |
| 505 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 506 | Flying M Petroleum LLC | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 507 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 508 | Flynn Energy Cor | | Oil & Gas Operator | Mar 1992 |
| 509 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 510 | Flynn, Ben A. Trustee | Coleman, TX 76834 | Oil & Gas Operator | Jul 2001 |
| 511 | FM Production | Kilgore, TX 75662 | Oil Operator | Feb 2026 |
| 512 | FMC Corporation | Green River, WY 82935 | Oil & Gas Operator | Dec 2008 |
| 513 | FMD Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2020 |
| 514 | FMF Oil And Gas Properties, Inc. | Silver Spring, MD 20910 | Oil & Gas Operator | Dec 2019 |
| 515 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 516 | FMR Services Inc. | | Gas Operator | Dec 2011 |
| 517 | Fna Oil Company, LLC | Richfield, KS 67953 | Gas Operator | Sep 2025 |
| 518 | Fne Operating LLC | | Oil Operator | Dec 2024 |
| 519 | Fo Energy LLC | Canton, OH 44718 | Oil & Gas Operator | Dec 2024 |
| 520 | Foag, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2022 |
| 521 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 522 | Fod Oil Company | | Oil Operator | May 1999 |
| 523 | Foggy Bottom Farms, LLC | Bowling Green, KY 42101 | Oil Operator | Dec 2023 |
| 524 | Fola Land Company Inc | | Gas Operator | Dec 2003 |
| 525 | Folk Oil | | Oil Operator | Dec 2009 |
| 526 | Follett Operating Co. | Darrouzett, TX 79024 | Oil & Gas Operator | Jun 2019 |
| 527 | Foltz & Foltz LTD Partnership | Robertsville, OH 44670 | Oil & Gas Operator | Dec 2018 |
| 528 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 529 | Fontenot Pet Land Services, Inc. | | Oil & Gas Operator | Aug 2002 |
| 530 | Foothill Energy, LLC | Spring, TX 77393 | Oil & Gas Operator | Feb 2026 |
| 531 | Foothills Energy LLC | Seabrook, TX 77586-3541 | Gas Operator | Feb 2013 |
| 532 | Foothills Texas, Inc. | Houston, TX 77269 | Oil & Gas Operator | Aug 2019 |
| 533 | Fora Company | Borger, TX 79007 | Oil & Gas Operator | Feb 2026 |
| 534 | Forbes Harold G | | Oil Operator | Dec 1984 |
| 535 | Forbes Producing, LLC | Corpus Chrsti, TX 78410 | Oil Operator | Sep 2025 |
| 536 | Forbes, C. C. Company | Alice, TX 78333 | Oil & Gas Operator | Sep 2015 |
| 537 | Forbes, Charles C. | Hebbronville, TX 78361 | Oil & Gas Operator | Jul 2011 |
| 538 | Forbes, Patrick T. | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 539 | Force 4 Energy Resources, Inc. | Austin, TX 78733 | Oil & Gas Operator | Aug 2005 |
| 540 | Force 5 Energy, LLC | Houston, TX 77090 | Oil & Gas Operator | Dec 2018 |
| 541 | Force Antrim Development Inc | | Gas Operator | Dec 1999 |
| 542 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 543 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 544 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 545 | Ford Chapman & Assoc | Midland, TX 79710 | Oil Operator | Sep 2000 |
| 546 | Ford Energy Corporation | Chickasha, OK 73018 | Oil & Gas Operator | Nov 2025 |
| 547 | Ford Gum & Machine Co., Inc. | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 548 | Ford Oil Co | Bangs, TX 76823 | Oil & Gas Operator | Dec 2022 |
| 549 | Ford Roger & Marjorie | Fowler, OH 44418 | Gas Operator | Dec 1993 |
| 550 | Ford Tank Truck Service | | Oil Operator | Jan 2022 |
| 551 | Ford, Cregg | Auburn, NY 13021 | Gas Operator | Dec 2024 |
| 552 | Ford, Don H. & Assoc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 553 | Ford, R. J. Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 554 | Fordoche Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 555 | Fordyce Oil & Gas | Sullivan City, TX 78595 | Oil & Gas Operator | Jul 2022 |
| 556 | Fordyce Oil & Gas, LLC | Sullivan City, TX 78595 | Gas Operator | Feb 2026 |
| 557 | Fore Oil, LLC | Manvel, TX 77578 | Oil Operator | May 2021 |
| 558 | Foree Oil Company | Terrell, TX 75160 | Oil & Gas Operator | Feb 2026 |
| 559 | Foree R L | Dallas, TX 75225 | Oil & Gas Operator | Aug 2001 |
| 560 | Foree, R. L. Trust "A" | Dallas, TX 75225 | Oil & Gas Operator | Dec 1999 |
| 561 | Foreland Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Oct 2021 |
| 562 | Foreland Resources LLC | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 563 | Forell Energy Company | Fullerton, CA 92838 | Oil Operator | Dec 2023 |
| 564 | Foreman Enterprises Inc | Edmond, OK 73003 | Oil & Gas Operator | Oct 2025 |
| 565 | Foreman Joy | Guymon, OK 73942-3159 | Oil & Gas Operator | Jan 2003 |
| 566 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 567 | Forest Gray Energy | | Oil & Gas Operator | Nov 2025 |
| 568 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 569 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 570 | Forestar Group Inc | | Oil Operator | Sep 2015 |
| 571 | Forestar Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 572 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 573 | Forexco, Inc. | Greensboro, NC 27438 | Oil & Gas Operator | Dec 2020 |
| 574 | Forge Energy Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 575 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |
| 576 | Forjack Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 1994 |
| 577 | Fork Run Oil & Gas LLC | Sheffield, PA 16347-0012 | Oil & Gas Operator | Dec 2025 |
| 578 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 579 | Forman Petroleum Corporation | | Oil & Gas Operator | Aug 2001 |
| 580 | Formation Mechan | | Oil Operator | Dec 1986 |
| 581 | Formation Recovery LLC | Weatherford, TX 76087 | Oil & Gas Operator | Feb 2026 |
| 582 | Formation Resources LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2026 |
| 583 | Formax Oil Company | | Oil & Gas Operator | Dec 1993 |
| 584 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 585 | Formentera Opr LLC | Austin, TX 78701-4889 | Gas Operator | Dec 2025 |
| 586 | Formholtz, Allen | Lakeview, NY 14085 | Gas Operator | Dec 2024 |
| 587 | Formor Operating Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2013 |
| 588 | Fornash Oil LLC | Waynesburg, OH 44688 | Oil & Gas Operator | Dec 2024 |
| 589 | Forney & McCombs | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 590 | Forney Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 591 | Forrest A Ward | Okmulgee, OK 74447-8891 | Oil & Gas Operator | Jul 2025 |
| 592 | Forrest Energy, LLC | Hattiesburg, MS 39401 | Oil & Gas Operator | Feb 1998 |
| 593 | Forrest Exploration & Dev, LLC | | Gas Operator | May 2003 |
| 594 | Forrest Richard E | New Bethlehem, PA 16242-2547 | Gas Operator | Dec 2019 |
| 595 | Forrest, Catherine M | | Oil & Gas Operator | Apr 2025 |
| 596 | Forrestel II, E. Peter | Akron, NY 14001 | Gas Operator | Dec 2024 |
| 597 | Forrester Oil & Gas Co. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 598 | Forrester, J. L. | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 599 | Forsan Oil Company | Forsan, TX 79733 | Oil & Gas Operator | Jul 2008 |
| 600 | Forster Oil Co. | | Oil & Gas Operator | Dec 2016 |