| 12601 | Hardesty Production | Gambier, OH 43022 | Oil & Gas Operator | Dec 2023 |
| 12602 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Jun 2025 |
| 12603 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 12604 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Jun 2025 |
| 12605 | Hardin Hanley E | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1995 |
| 12606 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 12607 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 12608 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 12609 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Mar 2025 |
| 12610 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Mar 2025 |
| 12611 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 12612 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 12613 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 12614 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Feb 2025 |
| 12615 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Jun 2025 |
| 12616 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Jun 2025 |
| 12617 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 12618 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 12619 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 12620 | Hardwick, Ross H. Oil Company | Devine, TX 78016 | Oil & Gas Operator | Jun 2025 |
| 12621 | Hardy And Hardy Consulting LLC | | Oil & Gas Operator | Mar 2025 |
| 12622 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 12623 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | Jun 2025 |
| 12624 | Hardy Salt Co. | | Oil & Gas Operator | Apr 1986 |
| 12625 | Hargis Exploration & Prod., Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1996 |
| 12626 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 12627 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 12628 | Hargraves Production, LLC | | Oil Operator | Jan 2025 |
| 12629 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 12630 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 12631 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 12632 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 12633 | Harken Southwest Corp | Dallas, TX 752612007 | Oil & Gas Operator | Feb 2001 |
| 12634 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 12635 | Harkins & Co. | | Oil & Gas Operator | Oct 1986 |
| 12636 | Harkins And Co., Et Al | | Oil & Gas Operator | Dec 1980 |
| 12637 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Jun 2025 |
| 12638 | Harley Drilling & Producing LTD | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 12639 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 12640 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 12641 | Harlow Enterprises LLC | Artesia, NM 88210 | Oil & Gas Operator | Apr 2025 |
| 12642 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 12643 | Harmel And Shawver Oil LLC | Wichita Falls, TX 76310 | Oil Operator | Jun 2025 |
| 12644 | Harmon O G LLC | Graysville, OH 45734 | Oil & Gas Operator | Dec 2024 |
| 12645 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 12646 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 12647 | Harmons Well Service | Graysville, OH 45734 | Oil & Gas Operator | Dec 2019 |
| 12648 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 12649 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Jun 2025 |
| 12650 | Harmony Oil & Gas Co Inc | Reno, NV 89509 | Oil Operator | Dec 1994 |
| 12651 | Harmony Producing Co Inc | | Oil & Gas Operator | Dec 1995 |
| 12652 | Harmony Trust | Allegany, NY 14706 | Oil & Gas Operator | Dec 2023 |
| 12653 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 12654 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 12655 | Harms, Vance N. | Talpa, TX 76882 | Oil & Gas Operator | Mar 2016 |
| 12656 | Harnetty Francis Dba Harnetty Oil & Gas | Junction City, OH 43748 | Oil & Gas Operator | Dec 2019 |
| 12657 | Harold Enterprises Inc | Kellyville, OK 74039-0441 | Oil & Gas Operator | Jan 2018 |
| 12658 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 12659 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 12660 | Harold M Root Foundation | | Oil Operator | Mar 2025 |
| 12661 | Harold R Elkin | Punxsutawney, PA 15767-7922 | Oil & Gas Operator | Dec 2016 |
| 12662 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 12663 | Harp, Stephen J. | Fredonia, NY 14063 | Gas Operator | Dec 2023 |
| 12664 | Harpel John P Jr | FT. Collins, CO 80525 | Oil & Gas Operator | May 1998 |
| 12665 | Harper Crosby Holdings, LLC | Weston, WV 26452 | Oil & Gas Operator | Dec 2024 |
| 12666 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2025 |
| 12667 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Dec 2024 |
| 12668 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Feb 2025 |
| 12669 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Feb 2025 |
| 12670 | Harper Production, LLC | Spearman, TX 79081 | Oil & Gas Operator | Jun 2025 |
| 12671 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Jun 2025 |
| 12672 | Harper, Mr. William | Clyde, NY 14433 | Gas Operator | Dec 2023 |
| 12673 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 12674 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 12675 | Harper, William E. Estate Of | Woodson, TX 76491 | Oil & Gas Operator | Feb 2025 |
| 12676 | Harrell Oil Company LLC | Ardmore, OK 73402 | Oil Operator | Jan 2025 |
| 12677 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 12678 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 12679 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 12680 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 12681 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 12682 | Harrier Holdings, LTD. | Burnet, TX 78611 | Oil Operator | Jun 2025 |
| 12683 | Harrigan Energy Partners, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2010 |
| 12684 | Harrigan Operating, LLC | Houston, TX 77258 | Oil & Gas Operator | Apr 2020 |
| 12685 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 12686 | Harrington Oil Inc. | | Oil & Gas Operator | Apr 1978 |
| 12687 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Mar 2025 |
| 12688 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 12689 | Harris & Payne-Randel Drilling | | Oil & Gas Operator | Dec 1989 |
| 12690 | Harris & Walton | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 12691 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 12692 | Harris Energy Partners Op, LLC | Fort Worth, TX 76116 | Oil Operator | Jun 2025 |
| 12693 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |
| 12694 | Harris Engineering Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 1996 |
| 12695 | Harris Les And Canonie Tony SR | | Gas Operator | Jan 1989 |
| 12696 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2025 |
| 12697 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Apr 2025 |
| 12698 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 12699 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 12700 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |