| 12401 | Hanson Energy | Glencoe, NM 88324 | Oil & Gas Operator | Jul 2008 |
| 12402 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 12403 | Hanson Natural Resources Co. | | Oil & Gas Operator | Nov 1991 |
| 12404 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Aug 2024 |
| 12405 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 12406 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 12407 | Hanvey, Don H. Oil Interests Inc | Ranger, TX 76470 | Oil & Gas Operator | Nov 2024 |
| 12408 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 12409 | Har-Ken Agent Ok, LTD | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2022 |
| 12410 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Jul 2024 |
| 12411 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 12412 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 12413 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 12414 | Harbert Energy Corp/Gulf Coast | | Oil & Gas Operator | Dec 1991 |
| 12415 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 12416 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | Nov 2024 |
| 12417 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2024 |
| 12418 | Harco Land, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Aug 1996 |
| 12419 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 12420 | Harcor Energy Inc. | | Gas Operator | Dec 1999 |
| 12421 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 12422 | Hard Rock DRLG Co | Falls Of Rough, KY 40119 | Oil Operator | Dec 2022 |
| 12423 | Hard Rock Exploration, Inc. | | Oil & Gas Operator | Dec 2008 |
| 12424 | Hard Rock Operating, LLC | Pawhuska, OK 74056 | Oil & Gas Operator | May 2022 |
| 12425 | Hardco, Inc. | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 12426 | Hardee Oil Co. | | Oil Operator | Dec 1994 |
| 12427 | Hardee Petroleum Co., A General PTSHP. | | Oil & Gas Operator | Dec 2013 |
| 12428 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 12429 | Hardesty Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 12430 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Nov 2024 |
| 12431 | Hardey Production Company | | Oil Operator | Nov 1998 |
| 12432 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Nov 2024 |
| 12433 | Hardin Hanley E | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 12434 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 12435 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 12436 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 12437 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Aug 2024 |
| 12438 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Jul 2024 |
| 12439 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 12440 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 12441 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 12442 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Aug 2024 |
| 12443 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Nov 2024 |
| 12444 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Nov 2024 |
| 12445 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 12446 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 12447 | Hardwick, Ross H. Oil Company | Devine, TX 78016 | Oil & Gas Operator | Nov 2024 |
| 12448 | Hardy And Hardy Consulting LLC | | Oil & Gas Operator | Jul 2024 |
| 12449 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 12450 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | Nov 2024 |
| 12451 | Hardy Salt Co. | | Oil & Gas Operator | Apr 1986 |
| 12452 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 12453 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 12454 | Hargraves Production, LLC | | Oil Operator | Jul 2024 |
| 12455 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 12456 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 12457 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 12458 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 12459 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 12460 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 12461 | Harkins & Co. | | Oil & Gas Operator | Oct 1986 |
| 12462 | Harkins And Co., Et Al | | Oil & Gas Operator | Dec 1980 |
| 12463 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Nov 2024 |
| 12464 | Harley Drilling & Producing LTD | Burbank, OH 44214 | Oil & Gas Operator | Dec 2023 |
| 12465 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 12466 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 12467 | Harlow Enterprises LLC | Artesia, NM 88210 | Oil & Gas Operator | Sep 2024 |
| 12468 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 12469 | Harmel And Shawver Oil LLC | Wichita Falls, TX 76310 | Oil Operator | Nov 2024 |
| 12470 | Harmon O G LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2022 |
| 12471 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 12472 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 12473 | Harmons Well Service | Graysville, OH 45734 | Oil & Gas Operator | Dec 2019 |
| 12474 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 12475 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Nov 2024 |
| 12476 | Harmony Oil & Gas Co Inc | Reno, NV 89509 | Oil Operator | Dec 1994 |
| 12477 | Harmony Producing Co Inc | | Oil & Gas Operator | Dec 1995 |
| 12478 | Harmony Trust | Allegany, NY 14706 | Oil & Gas Operator | Dec 2023 |
| 12479 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 12480 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 12481 | Harms, Vance N. | Talpa, TX 76882 | Oil & Gas Operator | Mar 2016 |
| 12482 | Harnetty Francis Dba Harnetty Oil & Gas | Junction City, OH 43748 | Oil & Gas Operator | Dec 2019 |
| 12483 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 12484 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 12485 | Harold M Root Foundation | | Oil Operator | Sep 2024 |
| 12486 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 12487 | Harp, Stephen J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 12488 | Harpel John P Jr | FT. Collins, CO 80525 | Oil & Gas Operator | May 1998 |
| 12489 | Harper Crosby Holdings, LLC | Weston, WV 26452 | Oil & Gas Operator | Dec 2023 |
| 12490 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Nov 2024 |
| 12491 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Jul 2024 |
| 12492 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Jul 2024 |
| 12493 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Jul 2024 |
| 12494 | Harper Production, LLC | Spearman, TX 79081 | Oil & Gas Operator | Nov 2024 |
| 12495 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Nov 2024 |
| 12496 | Harper, Mr. William | Clyde, NY 14433 | Gas Operator | Dec 2023 |
| 12497 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 12498 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 12499 | Harper, William E. Estate Of | Woodson, TX 76491 | Oil & Gas Operator | Nov 2024 |
| 12500 | Harrell Oil Company LLC | Ardmore, OK 73402 | Oil Operator | May 2024 |