| 12501 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 12502 | Hanger Oil, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 12503 | Hank Oil & Gas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2023 |
| 12504 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 12505 | Hankey Oil Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2010 |
| 12506 | Hankey Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2016 |
| 12507 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Jul 2025 |
| 12508 | Hanley & Bird Inc | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2011 |
| 12509 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 12510 | Hanna M A Co | Cleveland, OH 44114-1824 | Oil & Gas Operator | Dec 1991 |
| 12511 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Apr 2025 |
| 12512 | Hannathon Petroleum II, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 12513 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 12514 | Hannis Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Jul 2025 |
| 12515 | Hannold, Allan & Yolanda | Bloomfield, NY 14469 | Gas Operator | Dec 2024 |
| 12516 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 12517 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 12518 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 12519 | Hanselman, Michael D. | Jamestown, NY 14701 | Gas Operator | Dec 2024 |
| 12520 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 12521 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 12522 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 12523 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 12524 | Hanshu Production Company | Darrouzett, TX 79024 | Oil & Gas Operator | Apr 2017 |
| 12525 | Hanshu Production Company, LLC | Nashville, TN 37215 | Gas Operator | Jul 2025 |
| 12526 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 12527 | Hanson Energy | Glencoe, NM 88324 | Oil & Gas Operator | Jul 2008 |
| 12528 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 12529 | Hanson Natural Resources Co. | | Oil & Gas Operator | Nov 1991 |
| 12530 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Apr 2025 |
| 12531 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 12532 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 12533 | Hanvey, Don H. Oil Interests Inc | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 12534 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 12535 | Har-Ken Agent Ok, LTD | Owensboro, KY 42302 | Oil & Gas Operator | Dec 2023 |
| 12536 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Mar 2025 |
| 12537 | Har-Ken Oil Co | | Oil & Gas Operator | Dec 2021 |
| 12538 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 12539 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 12540 | Harbert Energy Corp/Gulf Coast | | Oil & Gas Operator | Dec 1991 |
| 12541 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 12542 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | Jul 2025 |
| 12543 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2025 |
| 12544 | Harco Land, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Aug 1996 |
| 12545 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 12546 | Harcor Energy Inc. | | Gas Operator | Dec 1999 |
| 12547 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 12548 | Hard Rock DRLG Co | Falls Of Rough, KY 40119 | Oil Operator | Dec 2023 |
| 12549 | Hard Rock Exploration, Inc. | | Oil & Gas Operator | Dec 2008 |
| 12550 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 12551 | Hardco, Inc. | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 12552 | Hardee Oil Co. | | Oil Operator | Dec 1994 |
| 12553 | Hardee Petroleum Co., A General PTSHP. | | Oil & Gas Operator | Dec 2013 |
| 12554 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 12555 | Hardesty Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 12556 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Jul 2025 |
| 12557 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 12558 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Jul 2025 |
| 12559 | Hardin Hanley E | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 12560 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 12561 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 12562 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 12563 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Apr 2025 |
| 12564 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Apr 2025 |
| 12565 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 12566 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 12567 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 12568 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Apr 2025 |
| 12569 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Jul 2025 |
| 12570 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Jul 2025 |
| 12571 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 12572 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 12573 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 12574 | Hardwick, Ross H. Oil Company | Devine, TX 78016 | Oil & Gas Operator | Jul 2025 |
| 12575 | Hardy And Hardy Consulting LLC | | Oil & Gas Operator | May 2025 |
| 12576 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 12577 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | Jul 2025 |
| 12578 | Hardy Salt Co. | | Oil & Gas Operator | Apr 1986 |
| 12579 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 12580 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 12581 | Hargraves Production, LLC | | Oil Operator | Jan 2025 |
| 12582 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 12583 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 12584 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 12585 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 12586 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 12587 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 12588 | Harkins & Co. | | Oil & Gas Operator | Oct 1986 |
| 12589 | Harkins And Co., Et Al | | Oil & Gas Operator | Dec 1980 |
| 12590 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 12591 | Harley Drilling & Producing LTD | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 12592 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 12593 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 12594 | Harlow Enterprises LLC | Artesia, NM 88210 | Oil & Gas Operator | May 2025 |
| 12595 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 12596 | Harmel And Shawver Oil LLC | Wichita Falls, TX 76310 | Oil Operator | Jul 2025 |
| 12597 | Harmon O G LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2024 |
| 12598 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 12599 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 12600 | Harmons Well Service | Graysville, OH 45734 | Oil & Gas Operator | Dec 2019 |