| 12601 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 12602 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 12603 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 12604 | Hanshu Production Company | Darrouzett, TX 79024 | Oil & Gas Operator | Apr 2017 |
| 12605 | Hanshu Production Company, LLC | Nashville, TN 37215 | Gas Operator | May 2025 |
| 12606 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 12607 | Hanson Energy | Glencoe, NM 88324 | Oil & Gas Operator | Jul 2008 |
| 12608 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 12609 | Hanson Natural Resources Co. | | Oil & Gas Operator | Nov 1991 |
| 12610 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Feb 2025 |
| 12611 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 12612 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 12613 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 12614 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 12615 | Har-Ken Agent Ok, LTD | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2023 |
| 12616 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Dec 2024 |
| 12617 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 12618 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 12619 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 12620 | Harbert Energy Corp/Gulf Coast | | Oil & Gas Operator | Dec 1991 |
| 12621 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 12622 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | May 2025 |
| 12623 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2025 |
| 12624 | Harborcreek SCH Dist | Harborcreek, PA 16421-1606 | Oil & Gas Operator | Dec 2024 |
| 12625 | Harco Land, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Aug 1996 |
| 12626 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 12627 | Harcor Energy Inc. | | Gas Operator | Dec 1999 |
| 12628 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 12629 | Hard Rock DRLG Co | Falls Of Rough, KY 40119 | Oil Operator | Dec 2023 |
| 12630 | Hard Rock Exploration, Inc. | | Oil & Gas Operator | Dec 2008 |
| 12631 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 12632 | Hardco, Inc. | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 12633 | Hardee Oil Co. | | Oil Operator | Dec 1994 |
| 12634 | Hardee Petroleum Co., A General PTSHP. | | Oil & Gas Operator | Dec 2013 |
| 12635 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 12636 | Hardesty Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 12637 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | May 2025 |
| 12638 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 12639 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | May 2025 |
| 12640 | Hardin Hanley E | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 12641 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 12642 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 12643 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 12644 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Feb 2025 |
| 12645 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Feb 2025 |
| 12646 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 12647 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 12648 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 12649 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Feb 2025 |
| 12650 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | May 2025 |
| 12651 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | May 2025 |
| 12652 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 12653 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 12654 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 12655 | Hardwick, Ross H. Oil Company | Devine, TX 78016 | Oil & Gas Operator | May 2025 |
| 12656 | Hardy And Hardy Consulting LLC | | Oil & Gas Operator | Feb 2025 |
| 12657 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 12658 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | May 2025 |
| 12659 | Hardy Salt Co. | | Oil & Gas Operator | Apr 1986 |
| 12660 | Hargis Exploration & Prod., Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1996 |
| 12661 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 12662 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 12663 | Hargraves Production, LLC | | Oil Operator | Jan 2025 |
| 12664 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 12665 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 12666 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 12667 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 12668 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 12669 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 12670 | Harkins & Co. | | Oil & Gas Operator | Oct 1986 |
| 12671 | Harkins And Co., Et Al | | Oil & Gas Operator | Dec 1980 |
| 12672 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | May 2025 |
| 12673 | Harley Drilling & Producing LTD | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 12674 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 12675 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 12676 | Harlow Enterprises LLC | Artesia, NM 88210 | Oil & Gas Operator | Mar 2025 |
| 12677 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 12678 | Harmel And Shawver Oil LLC | Wichita Falls, TX 76310 | Oil Operator | May 2025 |
| 12679 | Harmon O G LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2024 |
| 12680 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 12681 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 12682 | Harmons Well Service | Graysville, OH 45734 | Oil & Gas Operator | Dec 2019 |
| 12683 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 12684 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | May 2025 |
| 12685 | Harmony Oil & Gas Co Inc | Reno, NV 89509 | Oil Operator | Dec 1994 |
| 12686 | Harmony Producing Co Inc | | Oil & Gas Operator | Dec 1995 |
| 12687 | Harmony Trust | Allegany, NY 14706 | Oil & Gas Operator | Dec 2023 |
| 12688 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 12689 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 12690 | Harms, Vance N. | Talpa, TX 76882 | Oil & Gas Operator | Mar 2016 |
| 12691 | Harnetty Francis Dba Harnetty Oil & Gas | Junction City, OH 43748 | Oil & Gas Operator | Dec 2019 |
| 12692 | Harold Enterprises Inc | Kellyville, OK 74039-0441 | Oil & Gas Operator | Jan 2018 |
| 12693 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 12694 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 12695 | Harold M Root Foundation | | Oil Operator | Feb 2025 |
| 12696 | Harold R Elkin | Punxsutawney, PA 15767-7922 | Oil & Gas Operator | Dec 2016 |
| 12697 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 12698 | Harp, Stephen J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 12699 | Harpel John P Jr | FT. Collins, CO 80525 | Oil & Gas Operator | May 1998 |
| 12700 | Harper Crosby Holdings, LLC | Weston, WV 26452 | Oil & Gas Operator | Dec 2024 |