| 12601 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 12602 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Jul 2025 |
| 12603 | Harmony Oil & Gas Co Inc | Reno, NV 89509 | Oil Operator | Dec 1994 |
| 12604 | Harmony Oil LLC | Cushing, OK 74023 | Oil Operator | Apr 2025 |
| 12605 | Harmony Producing Co Inc | | Oil & Gas Operator | Dec 1995 |
| 12606 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 12607 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 12608 | Harms, Vance N. | Talpa, TX 76882 | Oil & Gas Operator | Mar 2016 |
| 12609 | Harnetty Francis Dba Harnetty Oil & Gas | Junction City, OH 43748 | Oil & Gas Operator | Dec 2019 |
| 12610 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 12611 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 12612 | Harold M Root Foundation | | Oil Operator | Apr 2025 |
| 12613 | Harold R Elkin | Punxsutawney, PA 15767-7922 | Oil & Gas Operator | Dec 2016 |
| 12614 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 12615 | Harp, Stephen J. | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 12616 | Harpel John P Jr | FT. Collins, CO 80525 | Oil & Gas Operator | May 1998 |
| 12617 | Harper Crosby Holdings, LLC | Weston, WV 26452 | Oil & Gas Operator | Dec 2024 |
| 12618 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 12619 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Dec 2024 |
| 12620 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Mar 2025 |
| 12621 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Mar 2025 |
| 12622 | Harper Production, LLC | Spearman, TX 79081 | Oil & Gas Operator | Jul 2025 |
| 12623 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Jul 2025 |
| 12624 | Harper, Mr. William | Clyde, NY 14433 | Gas Operator | Dec 2023 |
| 12625 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 12626 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 12627 | Harrell Oil Company LLC | Ardmore, OK 73402 | Oil Operator | Jan 2025 |
| 12628 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 12629 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 12630 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 12631 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 12632 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 12633 | Harrier Holdings, LTD. | Burnet, TX 78611 | Oil Operator | Jul 2025 |
| 12634 | Harrigan Energy Partners, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2010 |
| 12635 | Harrigan Operating, LLC | Houston, TX 77258 | Oil & Gas Operator | Apr 2020 |
| 12636 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 12637 | Harrington Oil Inc. | | Oil & Gas Operator | Apr 1978 |
| 12638 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Apr 2025 |
| 12639 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 12640 | Harris & Payne-Randel Drilling | | Oil & Gas Operator | Dec 1989 |
| 12641 | Harris & Walton | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 12642 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 12643 | Harris Energy Partners Op, LLC | Fort Worth, TX 76116 | Oil Operator | Jul 2025 |
| 12644 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 12645 | Harris Engineering Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 1996 |
| 12646 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2025 |
| 12647 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Apr 2025 |
| 12648 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 12649 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 12650 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 12651 | Harris, David | Toronto, KS 66777 | Oil Operator | Feb 2025 |
| 12652 | Harris, Jake, Trustee | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 2001 |
| 12653 | Harris, Sam E. | Albany, TX 76430 | Oil & Gas Operator | Aug 2003 |
| 12654 | Harris, William H. Jr. | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 12655 | Harrison & Lee | | Oil Operator | Sep 1996 |
| 12656 | Harrison Drilling Co | | Oil & Gas Operator | Mar 1981 |
| 12657 | Harrison Energy | Tippecanoe, OH 44699 | Oil & Gas Operator | Dec 2000 |
| 12658 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 12659 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Jan 2025 |
| 12660 | Harrison, Dan J III&Bruce F Est | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 12661 | Harrison, Dan J. III&Bruce F. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 12662 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 12663 | Harrison, Sam G. Oil, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2019 |
| 12664 | Harrison, Thomas D | Park City, UT 84060-7307 | Gas Operator | Dec 1998 |
| 12665 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | May 2025 |
| 12666 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 12667 | Harry Feder | | Oil & Gas Operator | Dec 1999 |
| 12668 | Harry L. Neeb | | Oil Operator | May 1985 |
| 12669 | Harsh International Inc | | Oil & Gas Operator | Dec 2013 |
| 12670 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Jul 2025 |
| 12671 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 12672 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 12673 | Hart Energy LLC | | Oil Operator | Dec 2024 |
| 12674 | Hart Oil & Gas Inc | Houston, TX 77024 | Oil & Gas Operator | Jan 2017 |
| 12675 | Hart Oil, LLC | | Oil Operator | Dec 2014 |
| 12676 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | Jul 2025 |
| 12677 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | Mar 2025 |
| 12678 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 12679 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 12680 | Harter Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | May 2025 |
| 12681 | Harter Oil Company | | Oil & Gas Operator | Apr 2011 |
| 12682 | Harter, Ron | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 12683 | Hartley Natural Resource Development | | Oil & Gas Operator | Apr 2025 |
| 12684 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Mar 2025 |
| 12685 | Hartman Oil And Gas Company | | Oil Operator | Dec 1998 |
| 12686 | Hartman Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 12687 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 12688 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Jul 2025 |
| 12689 | Harus Inc | Indiana, PA 15701-9401 | Oil & Gas Operator | Dec 2024 |
| 12690 | Harvard Investments, Inc. | | Oil & Gas Operator | Oct 2002 |
| 12691 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 12692 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 12693 | Harvest (Us) Holdings, Inc | Houston, TX 77077 | Oil & Gas Operator | Apr 2011 |
| 12694 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 12695 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |
| 12696 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 12697 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Jul 2025 |
| 12698 | Harvest Petroleum Partners, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 12699 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 12700 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |