| 12401 | Harper, Mr. William | Clyde, NY 14433 | Gas Operator | Dec 2025 |
| 12402 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 12403 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 12404 | Harrell Oil Company LLC | Ardmore, OK 73402 | Oil Operator | Jan 2025 |
| 12405 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 12406 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 12407 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 12408 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 12409 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 12410 | Harrier Holdings, LTD. | Burnet, TX 78611 | Oil Operator | Sep 2026 |
| 12411 | Harrigan Energy Partners, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2010 |
| 12412 | Harrigan Operating, LLC | Houston, TX 77258 | Oil & Gas Operator | Apr 2020 |
| 12413 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 12414 | Harrington Oil Inc. | | Oil & Gas Operator | Apr 1978 |
| 12415 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Jun 2026 |
| 12416 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 12417 | Harris & Payne-Randel Drilling | | Oil & Gas Operator | Dec 1989 |
| 12418 | Harris & Walton | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 12419 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 12420 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 12421 | Harris Engineering Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 1996 |
| 12422 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Jun 2026 |
| 12423 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Feb 2026 |
| 12424 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 12425 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 12426 | Harris Olin | Okmulgee, OK 74447-8508 | Oil Operator | Feb 2012 |
| 12427 | Harris, David | Toronto, KS 66777 | Oil Operator | May 2026 |
| 12428 | Harris, Jake, Trustee | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 2001 |
| 12429 | Harris, Sam E. | Albany, TX 76430 | Oil & Gas Operator | Aug 2003 |
| 12430 | Harris, William H. Jr. | Le Roy, NY 14482 | Gas Operator | Dec 2025 |
| 12431 | Harrison & Lee | | Oil Operator | Sep 1996 |
| 12432 | Harrison Drilling Co | | Oil & Gas Operator | Mar 1981 |
| 12433 | Harrison Energy | Tippecanoe, OH 44699 | Oil & Gas Operator | Dec 2000 |
| 12434 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 12435 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Jun 2026 |
| 12436 | Harrison, Dan J III&Bruce F Est | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 12437 | Harrison, Dan J. III&Bruce F. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 12438 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 12439 | Harrison, Sam G. Oil, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2019 |
| 12440 | Harrison, Thomas D | Park City, UT 84060-7307 | Gas Operator | Dec 1998 |
| 12441 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Jul 2026 |
| 12442 | Harrod Leasing | Edmond, OK 73034 | Oil & Gas Operator | Jun 2026 |
| 12443 | Harry Feder | | Oil & Gas Operator | Dec 1999 |
| 12444 | Harry L. Neeb | | Oil Operator | May 1985 |
| 12445 | Harsh International Inc | | Oil & Gas Operator | Dec 2013 |
| 12446 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Sep 2026 |
| 12447 | Hart David | Chickasha, OK 73018-7756 | Oil & Gas Operator | Mar 2015 |
| 12448 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 12449 | Hart Energy LLC | | Oil Operator | Jul 2026 |
| 12450 | Hart Oil & Gas Inc | Houston, TX 77024 | Oil & Gas Operator | Jan 2017 |
| 12451 | Hart Oil, LLC | | Oil Operator | Dec 2014 |
| 12452 | Hart Petroleum Services, Inc | Corpus Christ, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 12453 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | May 2026 |
| 12454 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 12455 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 12456 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2025 |
| 12457 | Harter Oil Company | | Oil & Gas Operator | Apr 2011 |
| 12458 | Harter, Ron | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 12459 | Hartley Natural Resource Development | | Oil & Gas Operator | Dec 2025 |
| 12460 | Hartline Tom | Drumright, OK 74030 | Oil Operator | Jun 2026 |
| 12461 | Hartman Oil And Gas Company | | Oil Operator | Dec 1998 |
| 12462 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 12463 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 12464 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Sep 2026 |
| 12465 | Harus Inc | | Oil & Gas Operator | Dec 2025 |
| 12466 | Harvard Investments, Inc. | | Oil & Gas Operator | Oct 2002 |
| 12467 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2026 |
| 12468 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 12469 | Harvest (Us) Holdings, Inc | Houston, TX 77077 | Oil & Gas Operator | Apr 2011 |
| 12470 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 12471 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |
| 12472 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 12473 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Sep 2026 |
| 12474 | Harvest Petroleum Partners LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 12475 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 12476 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 12477 | Harvey Broyles | | Oil & Gas Operator | May 2012 |
| 12478 | Harvey Broyles & Munoco Co. | | Oil & Gas Operator | Jan 2002 |
| 12479 | Harvey Broyles, Et Al | | Gas Operator | Nov 1985 |
| 12480 | Harvey E Yates Company | Roswell, NM 88202 | Oil & Gas Operator | Feb 2015 |
| 12481 | Harvey, James W. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2008 |
| 12482 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 12483 | Harvey, Robert E., Jr. | Nixon, TX 78140 | Oil & Gas Operator | Oct 2003 |
| 12484 | Harvick Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Feb 2009 |
| 12485 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 12486 | Harwell Enterprises Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jan 2005 |
| 12487 | Harwood Exploration, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 12488 | Harwood Oil & Gas Inc | Greeley, CO 80631-8233 | Oil & Gas Operator | Jun 2026 |
| 12489 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 12490 | Haskit, Kendall | Kyle, TX 78640 | Oil & Gas Operator | Sep 2026 |
| 12491 | Hassie Hunt Expl. Co. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 12492 | Hasso Energy LLC | | Oil & Gas Operator | Jul 2026 |
| 12493 | Hastings, J. W. Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2010 |
| 12494 | Hat Creek Cattle Company, A General Partnership | Paola, KS 66071 | Oil Operator | Aug 2016 |
| 12495 | Hat Creek Energy LLC | Denver, CO 80209 | Oil & Gas Operator | Jun 2019 |
| 12496 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 12497 | Hat Production LLC | Mound City, KS 66056 | Oil Operator | Apr 2026 |
| 12498 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 12499 | Hatch, Jeffrey And Chelsea | Bemus Point, NY 14712 | Gas Operator | Dec 2025 |
| 12500 | Hatcher, Ray | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2002 |