| 12401 | H.L. Clark Oil Company LLC | Whitesboro, TX 76273 | Oil Operator | Dec 2025 |
| 12402 | H.L. Hall & Sons LLC | | Oil & Gas Operator | Dec 2011 |
| 12403 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 12404 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 12405 | H.P. Slagel Producing Co., LLC | San Angelo, TX 76902 | Oil Operator | Dec 2025 |
| 12406 | H.T. Olsen Oil & Gas Operations | | Oil & Gas Operator | Oct 2025 |
| 12407 | H2oil Services LLC | | Oil Operator | Sep 2025 |
| 12408 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Sep 2025 |
| 12409 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Sep 2025 |
| 12410 | H3 Oil & Gas | | Oil & Gas Operator | Jun 2025 |
| 12411 | H3 Operating, LLC | Springtown, TX 76082 | Oil & Gas Operator | May 2020 |
| 12412 | Ha Goal Inc | Indiana, PA 15701-2664 | Oil & Gas Operator | Dec 2018 |
| 12413 | Ha.P.C. Oil, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Aug 2006 |
| 12414 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Apr 2025 |
| 12415 | Haas John L | | Oil Operator | Dec 2009 |
| 12416 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Jun 2025 |
| 12417 | Haas, C. F. Oil & Gas Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2025 |
| 12418 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 12419 | Haass Ranch Oil Company, LLC | Castroville, TX 78009 | Oil Operator | Dec 2025 |
| 12420 | Habanero Oil & Gas Operating,LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2018 |
| 12421 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 12422 | Habetz Oilfield Saltwater Ser, Inc | | Oil Operator | Dec 2024 |
| 12423 | Habit Petroleum | | Oil Operator | Dec 2009 |
| 12424 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 12425 | Hackberry Production, Inc. | | Oil Operator | Mar 1988 |
| 12426 | Hacker Brothers Oil Company, Inc | Muenster, TX 76252 | Oil & Gas Operator | May 2004 |
| 12427 | Hacker Brothers Well Service,Inc | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 12428 | Hacker, Freddie J. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2012 |
| 12429 | Hacker, Jack | Coats, KS 67028 | Oil & Gas Operator | Jun 2025 |
| 12430 | Hackley Okla Inc | | Oil & Gas Operator | Aug 1992 |
| 12431 | Had-A-Call Oil | | Oil Operator | Feb 2017 |
| 12432 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 12433 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Sep 2025 |
| 12434 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 12435 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 12436 | Haddad & Brooks Inc | Washington, PA 15301 | Oil & Gas Operator | Dec 2018 |
| 12437 | Haddad Boynton, LLC | Jonesville, TX 75659 | Oil Operator | Dec 2025 |
| 12438 | Hadden, Pennell & Rohret | Lakewood, CO 80228 | Oil Operator | Nov 1994 |
| 12439 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 12440 | Haddox Johnny C | Okemah, OK 74859-0254 | Oil Operator | Apr 2020 |
| 12441 | Haddox Petroleum Corp | | Gas Operator | Dec 2010 |
| 12442 | Hadley Oil | Nocona, TX 76255 | Oil Operator | Jan 2014 |
| 12443 | Hadley Oil Company, LLC | Nocona, TX 76255 | Oil Operator | Dec 2025 |
| 12444 | Hadley/Jackson Energy LLC | Lake Forest, IL 60045 | Oil & Gas Operator | Oct 2025 |
| 12445 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 12446 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 12447 | Hadson Petroleum | | Oil Operator | Sep 1988 |
| 12448 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 12449 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 12450 | Haessly Hardwood Lumber Inc | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 12451 | Hafer Run Enterprise | Independence, KS 67301 | Oil Operator | Oct 1997 |
| 12452 | Haffaday Oil LLC | | Oil Operator | Jan 2025 |
| 12453 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Jun 2025 |
| 12454 | Haffner Poor Farms, LLC | Hoxie, KS 67740 | Oil Operator | May 2025 |
| 12455 | Hagan, IVan - All-Kin Oil Co | | Oil Operator | Dec 2023 |
| 12456 | Hager Gas Co | Danville, WV 25053 | Gas Operator | Dec 2010 |
| 12457 | Haggard Operating Group/Oil | Atascosa, TX 78002 | Oil & Gas Operator | Dec 2025 |
| 12458 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 12459 | Hagler William N | Farmington, NM 87499-0035 | Oil Operator | Apr 2014 |
| 12460 | Hahn Kahle E | Knox, PA 16232-4311 | Oil & Gas Operator | Dec 2003 |
| 12461 | Haider Operating, LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 12462 | Haigood & Campbell | Archer City, TX 76351 | Oil & Gas Operator | Dec 2025 |
| 12463 | Haigood, Danny | Portland, TX 78374 | Oil & Gas Operator | Mar 2008 |
| 12464 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 12465 | Haile Petroleum LTD | Artesia, NM 882110186 | Oil & Gas Operator | Aug 2000 |
| 12466 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Jun 2025 |
| 12467 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 12468 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 12469 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 12470 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Dec 2025 |
| 12471 | Haischer James W Dba Haischer James W And Assoc | | Oil & Gas Operator | Dec 2001 |
| 12472 | Hal J Rasmussen Oper Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2014 |
| 12473 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 12474 | Haland Operating Company, LLC | | Oil & Gas Operator | Jul 2018 |
| 12475 | Halbouty, Michel T. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 12476 | Halbouty-Reserve | | Oil & Gas Operator | Sep 1987 |
| 12477 | Halbouty-Reserve-Pel-Tex | | Oil & Gas Operator | May 1985 |
| 12478 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 12479 | Halcon Louisiana Operating, LP | | Oil & Gas Operator | Sep 2017 |
| 12480 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 12481 | Halcon Opr Co Inc | Houston, TX 77002-5005 | Oil & Gas Operator | Jul 2017 |
| 12482 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 12483 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Jun 2025 |
| 12484 | Halde Oil Inc | | Oil & Gas Operator | Sep 2025 |
| 12485 | Hale John H | Tulsa, OK 74107 | Oil & Gas Operator | Mar 2000 |
| 12486 | Hale Oil | | Oil & Gas Operator | Dec 2024 |
| 12487 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 12488 | Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 12489 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 12490 | Hale, Mike E. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2003 |
| 12491 | Halek Energy L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jan 2014 |
| 12492 | Halex Inc | | Oil & Gas Operator | Nov 1988 |
| 12493 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 12494 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 12495 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 12496 | Hall & Horning Serv Inc | Atwater, OH 44201-9375 | Oil & Gas Operator | Dec 2009 |
| 12497 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 12498 | Hall Drilling LLC (Oil & Gas) | Ellenboro, WV 26346 | Gas Operator | Sep 2014 |
| 12499 | Hall Drilling, LLC | Ellenboro, WV 26346 | Oil & Gas Operator | Dec 2021 |
| 12500 | Hall Edward L | Ada, OK 74820-3321 | Oil & Gas Operator | Aug 2025 |