| 12501 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 12502 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 12503 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 12504 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 12505 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 12506 | Harrell, Herbert E | Columbia, KY 42728 | Oil Operator | Dec 2022 |
| 12507 | Harrier Holdings, LTD. | Burnet, TX 78611 | Oil Operator | Nov 2024 |
| 12508 | Harrigan Energy Partners, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2010 |
| 12509 | Harrigan Operating, LLC | Houston, TX 77258 | Oil & Gas Operator | Apr 2020 |
| 12510 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 12511 | Harrington Oil Inc. | | Oil & Gas Operator | Apr 1978 |
| 12512 | Harrington Orville | Dewey, OK 74029-4504 | Oil Operator | Sep 2024 |
| 12513 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 12514 | Harris & Payne-Randel Drilling | | Oil & Gas Operator | Dec 1989 |
| 12515 | Harris & Walton | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 12516 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 12517 | Harris Energy Partners Op, LLC | Fort Worth, TX 76116 | Oil Operator | Nov 2024 |
| 12518 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 12519 | Harris Engineering Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 1996 |
| 12520 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Aug 2024 |
| 12521 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Sep 2024 |
| 12522 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 12523 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 12524 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 12525 | Harris, David | Toronto, KS 66777 | Oil Operator | Jul 2024 |
| 12526 | Harris, Jake, Trustee | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 2001 |
| 12527 | Harris, Sam E. | Albany, TX 76430 | Oil & Gas Operator | Aug 2003 |
| 12528 | Harris, William H. Jr. | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 12529 | Harrison & Lee | | Oil Operator | Sep 1996 |
| 12530 | Harrison Drilling Co | | Oil & Gas Operator | Mar 1981 |
| 12531 | Harrison Energy | Tippecanoe, OH 44699 | Oil & Gas Operator | Dec 2000 |
| 12532 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 12533 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Sep 2024 |
| 12534 | Harrison, Dan J III&Bruce F Est | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 12535 | Harrison, Dan J. III&Bruce F. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 12536 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 12537 | Harrison, Sam G. Oil, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2019 |
| 12538 | Harrison, Thomas D | Park City, UT 84060-7307 | Gas Operator | Dec 1998 |
| 12539 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Sep 2024 |
| 12540 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Sep 2024 |
| 12541 | Harry Feder | | Oil & Gas Operator | Dec 1999 |
| 12542 | Harry L. Neeb | | Oil Operator | May 1985 |
| 12543 | Harsh International Inc | | Oil & Gas Operator | Dec 2013 |
| 12544 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Nov 2024 |
| 12545 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 12546 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 12547 | Hart Energy LLC | | Oil Operator | Mar 2023 |
| 12548 | Hart Oil & Gas Inc | Houston, TX 77024 | Oil & Gas Operator | Jan 2017 |
| 12549 | Hart Oil, LLC | | Oil Operator | Dec 2014 |
| 12550 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | Nov 2024 |
| 12551 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | Jul 2024 |
| 12552 | Hartco Oil Co. | | Oil Operator | Jul 2024 |
| 12553 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 12554 | Harter Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Aug 2024 |
| 12555 | Harter Oil Company | | Oil & Gas Operator | Apr 2011 |
| 12556 | Harter, Ron | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 12557 | Hartley Natural Resource Development | | Oil & Gas Operator | Aug 2024 |
| 12558 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Jun 2024 |
| 12559 | Hartman Oil And Gas Company | | Oil Operator | Dec 1998 |
| 12560 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jul 2024 |
| 12561 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 12562 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Nov 2024 |
| 12563 | Harus Inc | Indiana, PA 15701-9401 | Oil & Gas Operator | Dec 2023 |
| 12564 | Harvard Investments, Inc. | | Oil & Gas Operator | Oct 2002 |
| 12565 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Nov 2024 |
| 12566 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 12567 | Harvest (Us) Holdings, Inc | Houston, TX 77077 | Oil & Gas Operator | Apr 2011 |
| 12568 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 12569 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |
| 12570 | Harvest Oil, LP | Camden, AR 71701 | Oil & Gas Operator | Jul 2024 |
| 12571 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 12572 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Nov 2024 |
| 12573 | Harvest Petroleum Partners, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2024 |
| 12574 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 12575 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 12576 | Harvey Broyles | | Oil & Gas Operator | May 2012 |
| 12577 | Harvey Broyles & Munoco Co. | | Oil & Gas Operator | Jan 2002 |
| 12578 | Harvey Broyles, Et Al | | Gas Operator | Nov 1985 |
| 12579 | Harvey E Yates Company | Roswell, NM 88202 | Oil & Gas Operator | Feb 2015 |
| 12580 | Harvey, James W. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2008 |
| 12581 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 12582 | Harvey, Robert E., Jr. | Nixon, TX 78140 | Oil & Gas Operator | Oct 2003 |
| 12583 | Harvick Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Feb 2009 |
| 12584 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Nov 2024 |
| 12585 | Harwell Enterprises Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jan 2005 |
| 12586 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 12587 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Aug 2024 |
| 12588 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 12589 | Haskit, Kendall | Kyle, TX 78640 | Oil & Gas Operator | Nov 2024 |
| 12590 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 12591 | Hasso Energy LLC | | Oil & Gas Operator | Jul 2024 |
| 12592 | Hastings, J. W. Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2010 |
| 12593 | Hat Creek Cattle Company, A General Partnership | Paola, KS 66071 | Oil Operator | Aug 2016 |
| 12594 | Hat Creek Energy LLC | Denver, CO 80209 | Oil & Gas Operator | Jun 2019 |
| 12595 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 12596 | Hat Production LLC | Mound City, KS 66056 | Oil Operator | Jun 2024 |
| 12597 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 12598 | Hatch, Jeffrey And Chelsea | Bemus Point, NY 14712 | Gas Operator | Dec 2023 |
| 12599 | Hatcher, Ray | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2002 |
| 12600 | Hatco Productions LTD | North Augusta, SC 29860 | Oil Operator | Dec 2023 |