| 12701 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 12702 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 12703 | Hammer Oil Company | Post, TX 79356 | Oil & Gas Operator | Jun 2002 |
| 12704 | Hammer Oil Properties Inc | Enid, OK 73706-0144 | Oil & Gas Operator | Oct 2017 |
| 12705 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 12706 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 12707 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 12708 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Dec 2024 |
| 12709 | Hammersmith, Beverly | West Falls, NY 14170 | Gas Operator | Dec 2023 |
| 12710 | Hammon Properties | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1996 |
| 12711 | Hammond Valley Colony, Inc. | Harlowton, MT 59036 | Gas Operator | Jan 2025 |
| 12712 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 12713 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 12714 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 12715 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 12716 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 12717 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 12718 | Hampton Oil & Gas | Early, TX 76802 | Gas Operator | Feb 2012 |
| 12719 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 12720 | Hampton, Jno. W. & Son | Wichita Falls, TX 76302 | Oil & Gas Operator | Nov 1998 |
| 12721 | Hanaco Operating | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 12722 | Hanaco, LLC | Holliday, TX 76366 | Oil Operator | Dec 2017 |
| 12723 | Hanagan Petroleum Corp | Roswell, NM 88201 | Oil & Gas Operator | Sep 1999 |
| 12724 | Hancock Leon | Kingston, OK 73439-9618 | Oil Operator | Dec 2014 |
| 12725 | Hancock, Burton W | Morrison, CO 80465 | Oil & Gas Operator | Dec 2017 |
| 12726 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 12727 | Handy, Daniel G. | East Aurora, NY 14052 | Gas Operator | Dec 2023 |
| 12728 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 12729 | Hanger Oil, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 12730 | Hank Oil & Gas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2023 |
| 12731 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 12732 | Hankey Oil Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2010 |
| 12733 | Hankey Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2016 |
| 12734 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2025 |
| 12735 | Hanley & Bird Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2011 |
| 12736 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 12737 | Hanna M A Co | Cleveland, OH 44114-1824-1824 | Oil & Gas Operator | Dec 1991 |
| 12738 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Jan 2025 |
| 12739 | Hannathon Petroleum II, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 12740 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 12741 | Hannis Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 12742 | Hannold, Allan & Yolanda | Bloomfield, NY 14469 | Gas Operator | Dec 2023 |
| 12743 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2025 |
| 12744 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 12745 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 12746 | Hanselman, Michael D. | Jamestown, NY 14701 | Gas Operator | Dec 2023 |
| 12747 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 12748 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 12749 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 12750 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 12751 | Hansford, Inc. | Amarillo, TX 79101 | Gas Operator | Dec 2004 |
| 12752 | Hanshu Production Company | Darrouzett, TX 79024 | Oil & Gas Operator | Apr 2017 |
| 12753 | Hanshu Production Company, LLC | Nashville, TN 37215 | Gas Operator | Apr 2025 |
| 12754 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 12755 | Hanson Energy | Glencoe, NM 88324 | Oil & Gas Operator | Jul 2008 |
| 12756 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 12757 | Hanson Natural Resources Co. | | Oil & Gas Operator | Nov 1991 |
| 12758 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Jan 2025 |
| 12759 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 12760 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 12761 | Hanvey, Don H. Oil Interests Inc | Ranger, TX 76470 | Oil & Gas Operator | Apr 2025 |
| 12762 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 12763 | Har-Ken Agent Ok, LTD | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2023 |
| 12764 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Dec 2024 |
| 12765 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 12766 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 12767 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 12768 | Harbert Energy Corp/Gulf Coast | | Oil & Gas Operator | Dec 1991 |
| 12769 | Harbon Oil Company LLC | Yale, OK 74085 | Oil Operator | Jan 2025 |
| 12770 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 12771 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | Apr 2025 |
| 12772 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2025 |
| 12773 | Harborcreek SCH Dist | Harborcreek, PA 16421-1606 | Oil & Gas Operator | Dec 2024 |
| 12774 | Harco Land, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Aug 1996 |
| 12775 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 12776 | Harcor Energy Inc. | | Gas Operator | Dec 1999 |
| 12777 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 12778 | Hard Rock DRLG Co | Falls Of Rough, KY 40119 | Oil Operator | Dec 2023 |
| 12779 | Hard Rock Exploration, Inc. | | Oil & Gas Operator | Dec 2008 |
| 12780 | Hard Rock Operating, LLC | Pawhuska, OK 74056 | Oil & Gas Operator | May 2022 |
| 12781 | Hardco, Inc. | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 12782 | Hardee Oil Co. | | Oil Operator | Dec 1994 |
| 12783 | Hardee Petroleum Co., A General PTSHP. | | Oil & Gas Operator | Dec 2013 |
| 12784 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 12785 | Hardesty Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 12786 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Apr 2025 |
| 12787 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 12788 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Apr 2025 |
| 12789 | Hardin Hanley E | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 12790 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 12791 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 12792 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 12793 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Jan 2025 |
| 12794 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Jan 2025 |
| 12795 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 12796 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 12797 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 12798 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Dec 2024 |
| 12799 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2025 |
| 12800 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Apr 2025 |