| 401 | Flanagan Energy Company LLC | Walters, OK 73572 | Oil Operator | Feb 2025 |
| 402 | Flanigan Bros | Edinboro, PA 16412-1443 | Oil & Gas Operator | Dec 2024 |
| 403 | Flare Inc | | Oil & Gas Operator | Jul 1995 |
| 404 | Flare Oil Inc | Rockport, TX 78382 | Oil & Gas Operator | Dec 2025 |
| 405 | Flare Resources Inc. | Houston, TX 77002 | Gas Operator | Jun 2006 |
| 406 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 407 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 408 | Flash Gas & Oil, Inc. | | Oil & Gas Operator | May 1991 |
| 409 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 410 | Flat Creek Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 411 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 412 | Flatiron Exploration LLC | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 413 | Flatirons Development LLC | Westminster, CO 80020-2771 | Gas Operator | Dec 2015 |
| 414 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 415 | Flatland Energy, LLC | Gardner, KS 66030 | Oil Operator | Jun 2025 |
| 416 | Flatland Oil Com | | Oil Operator | Sep 1985 |
| 417 | Flatlander Energy LLC | Blackwell, OK 74631 | Oil & Gas Operator | Oct 2025 |
| 418 | Flatlander Petroleum LLC | | Oil & Gas Operator | Jun 2025 |
| 419 | Flatonia Energy, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 420 | Flatrock Energy Co | | Oil & Gas Operator | May 2017 |
| 421 | Flatt Energy Inc | | Oil & Gas Operator | Sep 2019 |
| 422 | Flatwater Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 423 | Flavian Oil Company | Dallas, TX 75206 | Gas Operator | Jan 1997 |
| 424 | Fleeharty Willie W | | Oil & Gas Operator | Jun 1991 |
| 425 | Fleeman Teresa R | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2024 |
| 426 | Fleet Frank T | Ada, OK 74821-0729 | Oil & Gas Operator | Feb 2003 |
| 427 | Fleet Oil Co. | | Oil & Gas Operator | Dec 1991 |
| 428 | Fleetwood K Phil Oil Properties | Marlow, OK 73055 | Oil & Gas Operator | Sep 2025 |
| 429 | Fletcher Oil LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Oct 2025 |
| 430 | Fletcher Operating Co. | | Oil & Gas Operator | May 1989 |
| 431 | Fletcher Operating, LLC | Fairhope, AL 36532 | Oil & Gas Operator | Dec 2025 |
| 432 | Fletcher Petroleum Corp. | Fairhope, AL 36533 | Oil & Gas Operator | Sep 2025 |
| 433 | Fletcher, M. D. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2007 |
| 434 | Fleur David Corp | | Gas Operator | Jul 2001 |
| 435 | Flex Energy, L.L.C. | | Oil & Gas Operator | Feb 2010 |
| 436 | Flicka Energy Inc | Crescent, OK 73028 | Oil & Gas Operator | Mar 2022 |
| 437 | Flint Douglas J | Mounds, OK 74047-5415 | Oil & Gas Operator | Sep 2015 |
| 438 | Flint Equipment LLC | Cushing, OK 74023 | Oil Operator | Oct 2025 |
| 439 | Flint Hills Production Co., Inc. | Gas City, KS 66742 | Oil Operator | Nov 2009 |
| 440 | Flint Interests, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 441 | Flint J A & Associates | Holdenville, OK 74848 | Oil & Gas Operator | Sep 2009 |
| 442 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Dec 2025 |
| 443 | Flint Oil & Gas | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 444 | Flint Pipeline Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 445 | Flint Rock Resources MGMNT, Inc. | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |
| 446 | Flint, Billy Individual | Merkel, TX 79536 | Oil & Gas Operator | Dec 2025 |
| 447 | Flintlock Exploration, LLC | Frisco, TX 75035 | Oil & Gas Operator | Dec 2025 |
| 448 | Flintstone Energy, LLC | El Dorado, KS 67042 | Oil Operator | Jun 2020 |
| 449 | Flo Petro, LLC. | Austin, TX 78746 | Oil Operator | Dec 2025 |
| 450 | Floex Energy LLC | Tyler, TX 75701 | Oil Operator | Dec 2025 |
| 451 | Flood Thirty Seven LLC | Dewey, OK 74029 | Oil Operator | Aug 2025 |
| 452 | Flora B Shinnick | | Oil Operator | Jan 2025 |
| 453 | Florabama Assoc Inc | | Oil & Gas Operator | Jan 2000 |
| 454 | Florentine Exploration & Production, Inc. | | Oil Operator | Mar 1997 |
| 455 | Flores & Rucks, Inc. | | Oil & Gas Operator | Jun 1997 |
| 456 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 457 | Florida Gas Exploration Co | | Oil & Gas Operator | Feb 1985 |
| 458 | Florida Gas Transmission Co. | | Oil Operator | Dec 2007 |
| 459 | Florine, Inc. | Gypsum, KS 67448 | Oil Operator | Mar 2025 |
| 460 | Flourison Oil & Gas, LLC | | Oil Operator | Jan 2025 |
| 461 | Flournoy Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 462 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 463 | Flournoy, Russell B. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2020 |
| 464 | Flow Energy Inc. | Bellaire, TX 77401 | Oil & Gas Operator | Sep 1996 |
| 465 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 466 | Flowers Prod Com | | Oil Operator | Aug 1994 |
| 467 | Flowers Production Co., Inc. | El Dorado, KS 67042 | Oil Operator | Jul 2009 |
| 468 | Flowers Well Ser | | Oil Operator | Feb 1991 |
| 469 | Flowin Gold Inc | Sapulpa, OK 74066-9735 | Oil & Gas Operator | Apr 2020 |
| 470 | Floyd & Alene Jenner | | Oil & Gas Operator | Dec 2003 |
| 471 | Floyd Oil Company | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 472 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 473 | Floyd Ray Porter | | Oil & Gas Operator | Nov 1986 |
| 474 | Floyd Williams | | Oil Operator | Aug 1988 |
| 475 | Floyd, Timber Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 476 | Flud Richard | Okmulgee, OK 74447 | Oil & Gas Operator | Mar 2015 |
| 477 | Fluharty Enterprises Inc | Bridgeport, WV 25338 | Oil & Gas Operator | Oct 2021 |
| 478 | Fluid Disposal Services LLC | Chickasha, OK 73018-9684 | Oil Operator | Aug 2015 |
| 479 | Fluor Oil & Gas Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2019 |
| 480 | Flusche Brothers | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 481 | Flusche Herbert J | Wichita Falls, TX 76309 | Oil Operator | Jun 1997 |
| 482 | Flusche Properties, L.L.C. | Electra, TX 76360 | Oil & Gas Operator | Jan 2017 |
| 483 | Flusche Supply, Inc. | Electra, TX 76360 | Oil & Gas Operator | Aug 1994 |
| 484 | Flusche, Herb | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2005 |
| 485 | Flux Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Dec 2025 |
| 486 | Flying Diamond Oil Corp | | Oil & Gas Operator | Dec 1983 |
| 487 | Flying J Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Jul 1995 |
| 488 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 489 | Flying M Petroleum LLC | Bristow, OK 74010 | Oil & Gas Operator | Oct 2025 |
| 490 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 491 | Flynn Energy Cor | | Oil & Gas Operator | Mar 1992 |
| 492 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 493 | Flynn, Ben A. Trustee | Coleman, TX 76834 | Oil & Gas Operator | Jul 2001 |
| 494 | FM Production | Kilgore, TX 75662 | Oil Operator | Dec 2025 |
| 495 | FMC Corporation | Green River, WY 82935 | Oil & Gas Operator | Dec 2008 |
| 496 | FMD Oil Co. | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2020 |
| 497 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 498 | FMR Services Inc. | | Gas Operator | Dec 2011 |
| 499 | Fna Oil Company, LLC | Richfield, KS 67953 | Gas Operator | Jun 2025 |
| 500 | Fne Operating LLC | | Oil Operator | Dec 2024 |