| 301 | Finnell Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2009 |
| 302 | Finnell Oil Services, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 303 | Finney Drilling Company | Wann, OK 74083-2314 | Oil Operator | Jul 2018 |
| 304 | Finney Kyler A Dba Finney Oil Co | Wann, OK 74083 | Oil Operator | Mar 2026 |
| 305 | Finney Oil Company | | Oil & Gas Operator | Feb 2026 |
| 306 | Finston Arthur | Tulsa, OK 74105-7183 | Oil & Gas Operator | Mar 2007 |
| 307 | Firebird Energy II LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 308 | Firebird Energy LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2022 |
| 309 | Firehouse Energy LLC | Morris, OK 74445 | Oil & Gas Operator | Mar 2024 |
| 310 | Firerock Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2026 |
| 311 | Fireside Oil And Gas, Inc. | West Monroe, LA 71294 | Oil & Gas Operator | Feb 2002 |
| 312 | Firestone Tire & Rubber | Akron, OH 44317 | Oil & Gas Operator | Dec 1989 |
| 313 | Firewater, Inc. | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2011 |
| 314 | Firewheel Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2017 |
| 315 | Firey Oil Company | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2021 |
| 316 | First Alliance CH | Erie, PA 16506-5024 | Gas Operator | Dec 2017 |
| 317 | First Amer Energy Inc | Bradford, PA 16701-0184 | Oil & Gas Operator | Dec 2025 |
| 318 | First American Operating Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2006 |
| 319 | First Aransas Reserves, Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2018 |
| 320 | First Ascent Operating LLC | Addison, TX 75001 | Oil Operator | Mar 2026 |
| 321 | First Chinese Baptist Church | | Oil Operator | Dec 2006 |
| 322 | First Energy Cor | | Oil Operator | Aug 1990 |
| 323 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 324 | First Energy Development Corp. | | Oil & Gas Operator | Sep 2008 |
| 325 | First Energy Properties | Houston, TX 77060 | Oil & Gas Operator | Dec 1986 |
| 326 | First Liberty Energy Inc | Boca Raton, FL 33432-5942 | Oil & Gas Operator | Jul 2013 |
| 327 | First Light Operating, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2026 |
| 328 | First National Finance Corporation | | Oil Operator | Dec 1995 |
| 329 | First National Oil Inc | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 330 | First Natural Gas Inc | Checotah, OK 74426 | Oil & Gas Operator | Jan 2026 |
| 331 | First Oil And Gas Company | | Oil Operator | Dec 2025 |
| 332 | First Paragon Properties, L.L.C. | Alice, TX 78333 | Oil Operator | Jun 2026 |
| 333 | First Permian, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 334 | First Reserve Oil & Gas Co | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 335 | First Rock, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 336 | First Solid Energy Group, LP | Missouri City, TX 77489 | Oil & Gas Operator | Jun 2026 |
| 337 | First Source Gas, LP | Houston, TX 77010 | Gas Operator | Jan 2006 |
| 338 | First Source Texas, Inc. | MT Pleasant, MI 48858 | Gas Operator | Nov 2004 |
| 339 | First Sourcenergy Wyoming Inc | Gillette, WY 82718 | Gas Operator | Jul 2003 |
| 340 | First South Energy Corp | Hartland, WI 53029 | Oil & Gas Operator | Dec 2014 |
| 341 | First Texas Exploration Corp. | Arcadia, LA 71001 | Oil & Gas Operator | Aug 2003 |
| 342 | First Zone Production | Salt Lake City, UT 84102 | Oil & Gas Operator | Dec 1997 |
| 343 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 344 | Fischer Operating Corporation | Victoria, TX 77902 | Oil & Gas Operator | Jan 1999 |
| 345 | Fiscus Drilling Co., Inc. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2015 |
| 346 | Fishburn Producing Inc | Marengo, OH 43334 | Oil & Gas Operator | Dec 2024 |
| 347 | Fishburn Services Inc | Marengo, OH 43334 | Oil & Gas Operator | Dec 1990 |
| 348 | Fishcreek Minerals, LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 349 | Fisher Ellis R | Bristow, OK 74010-8515 | Oil & Gas Operator | Dec 2015 |
| 350 | Fisher Ernest B | Bristow, OK 74010 | Oil Operator | Jul 2024 |
| 351 | Fisher Joint Venture | | Oil & Gas Operator | Oct 1998 |
| 352 | Fisher McCall Oil And Gas Inc | | Oil Operator | Dec 2014 |
| 353 | Fisher Oil Co. | Big Lake, TX 76932 | Oil & Gas Operator | Jun 2026 |
| 354 | Fisher, Jack Inc. | Abilene, TX 79603 | Oil & Gas Operator | Sep 2001 |
| 355 | Fisher, L. C. Jr. | Longview, TX 75608 | Oil & Gas Operator | May 1993 |
| 356 | Fisk Family Farms LLC | | Gas Operator | Mar 2026 |
| 357 | Fitch Petroleum Company Inc | Adair, OK 74330 | Oil Operator | Jan 2026 |
| 358 | Fite Oil & Gas, Inc. | Shreveport, LA 71163 | Oil & Gas Operator | Jun 2026 |
| 359 | Fitts, B.K. Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | Jun 2026 |
| 360 | Fitzgerald Oil Company | Waurika, OK 73573 | Oil Operator | Mar 2026 |
| 361 | Fitzgerald Production Co. | Oil City, LA 71061 | Oil & Gas Operator | Dec 2024 |
| 362 | Fitzpatrick, Stephen | Angola, NY 14006 | Gas Operator | Dec 2024 |
| 363 | Fitzsimmons Randall W & Deborah S | Bartelsville, OK 74006 | Oil & Gas Operator | Mar 2026 |
| 364 | Five D Co | Cactus, TX 79013 | Oil & Gas Operator | Sep 1996 |
| 365 | Five K Partnership | Graham, TX 76450 | Oil & Gas Operator | Oct 2023 |
| 366 | Five Star Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Feb 2026 |
| 367 | Five State Energy Co | Dallas, TX 75206 | Oil & Gas Operator | Oct 1995 |
| 368 | Five States Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 369 | Five States Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Feb 2008 |
| 370 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 371 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Jun 2026 |
| 372 | Fiveash Operating Company, Inc. | Christoval, TX 76935 | Oil & Gas Operator | Aug 2003 |
| 373 | Fivestones Energy LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 374 | FJH Oil Company | Muenster, TX 76252 | Oil & Gas Operator | Jun 2026 |
| 375 | Fjo Energy, LLC | Fairhope, AL 36532 | Oil Operator | Jun 2026 |
| 376 | Flag DRLG Co, Inc | Greenville, KY 42345 | Oil & Gas Operator | Dec 2024 |
| 377 | Flag Energy, LLC | Centerton, AR 72719 | Oil & Gas Operator | Nov 2018 |
| 378 | Flag Transport Inc | Shattuck, OK 73858-0848 | Oil Operator | Dec 2014 |
| 379 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 380 | Flagin Operating LLC | Norman, OK 73072-2405 | Oil & Gas Operator | Feb 2026 |
| 381 | Flahive Oil & Gas LLC | Golden, CO 80401 | Oil Operator | Oct 1995 |
| 382 | Flairtex Resources, Inc. | Houston, TX 77040 | Oil & Gas Operator | Oct 1998 |
| 383 | Flame Energy Co Inc | Dalton, OH 44618 | Oil & Gas Operator | Dec 2006 |
| 384 | Flamingo Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | Jun 2026 |
| 385 | Flamingo Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Jun 2026 |
| 386 | Flanagan Energy Company LLC | Walters, OK 73572 | Oil Operator | Feb 2025 |
| 387 | Flanigan Bros | Edinboro, PA 16412-1443 | Oil & Gas Operator | Dec 2025 |
| 388 | Flare Inc | | Oil & Gas Operator | Jul 1995 |
| 389 | Flare Oil Inc | Rockport, TX 78382 | Oil & Gas Operator | Jun 2026 |
| 390 | Flare Resources Inc. | Houston, TX 77002 | Gas Operator | Jun 2006 |
| 391 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 392 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 393 | Flash Gas & Oil, Inc. | | Oil & Gas Operator | May 1991 |
| 394 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 395 | Flat Creek Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 396 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2026 |
| 397 | Flatiron Exploration LLC | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 398 | Flatirons Development LLC | Westminster, CO 80020-2771 | Gas Operator | Dec 2015 |
| 399 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 400 | Flatland Energy, LLC | Gardner, KS 66030 | Oil Operator | Jan 2026 |