| 12501 | Hays Herb E & K S | Bartlesville, OK 74006 | Oil Operator | Apr 2026 |
| 12502 | Hays Oil Field S | | Oil Operator | Nov 1988 |
| 12503 | Hays Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2000 |
| 12504 | Hays Partnership | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 12505 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Apr 2026 |
| 12506 | Hays Stanley L | Wynola, OK 74084 | Oil Operator | May 2022 |
| 12507 | Hays, David H. | Olney, TX 76374 | Oil & Gas Operator | Dec 1995 |
| 12508 | Hays, John H. | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 12509 | Hays, Mrs. Earl (Cora) | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2005 |
| 12510 | Hays, T.G. Petroleum Expl., Inc. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 12511 | Haywood, Paul M. Jr. | Denton, TX 76206 | Oil & Gas Operator | Mar 2002 |
| 12512 | Hazelett Oil Company, Inc. | Dale, TX 78616 | Oil & Gas Operator | Sep 2005 |
| 12513 | Hazelett Oil, Inc. | Dale, TX 78616 | Oil & Gas Operator | Aug 2024 |
| 12514 | Hazelwood Louis J | Albuquerque, NM 87111-6870 | Oil & Gas Operator | Feb 2023 |
| 12515 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Feb 2026 |
| 12516 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 12517 | Hazen, Paul D. | Great Bend, KS 67530 | Oil Operator | Nov 1990 |
| 12518 | Hazen, Ty Anthony | Lyons, KS 67554 | Oil Operator | Feb 2026 |
| 12519 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 12520 | Hazoco, L.L.C. | Bellville, TX 77418 | Oil Operator | Jun 2026 |
| 12521 | HB Energy LLC | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 12522 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 12523 | HBC Oil Company, LLC | San Antonio, TX 78266 | Oil Operator | Jun 2026 |
| 12524 | HC Resources, Inc. | | Oil & Gas Operator | Jul 2011 |
| 12525 | Hce Operating LLC | Smyer, TX 79367 | Oil & Gas Operator | Jun 2026 |
| 12526 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 12527 | HCL Inc | Woodward, OK 73802-1074 | Oil Operator | Mar 2015 |
| 12528 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 12529 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 12530 | HD Special-Situations, LP | San Francisco, CA 94111 | Oil & Gas Operator | Feb 2014 |
| 12531 | HD Well Services LLC | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 12532 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Oct 2025 |
| 12533 | HDS Production | | Oil Operator | Mar 1998 |
| 12534 | HDT Inc. | | Oil & Gas Operator | Mar 2026 |
| 12535 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 12536 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 12537 | Headington Energy Partners, LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 12538 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 12539 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 12540 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 12541 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 12542 | Headwaters Energy Partners, LLC | Dripping SPGS, TX 78620 | Oil & Gas Operator | Jun 2026 |
| 12543 | Headwaters Oil Company | | Oil & Gas Operator | Oct 1981 |
| 12544 | Heape Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2020 |
| 12545 | Heape, Gene G. | Dallas, TX 75367 | Oil & Gas Operator | Jun 2003 |
| 12546 | Hearn Oil Co. LLC | Newport, OH 45768 | Oil & Gas Operator | Dec 2024 |
| 12547 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 12548 | Heartland Energy Company | Big Horn, WY 82833 | Gas Operator | Jun 2012 |
| 12549 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 12550 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 12551 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 12552 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 12553 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 12554 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | Jun 2026 |
| 12555 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Mar 2026 |
| 12556 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 12557 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 12558 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 12559 | Heat Controller Inc | Jackson, MI 49204 | Oil & Gas Operator | Dec 1996 |
| 12560 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 12561 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 12562 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Mar 2026 |
| 12563 | Heath, Francis A. & Ruth E. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 12564 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 12565 | Heather & Randy Iantorno Oil | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2024 |
| 12566 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 12567 | Hebert & Rucks L.L.C. | | Oil & Gas Operator | May 2002 |
| 12568 | Hebron Energy, LLC | Dallas, TX 75206 | Oil Operator | Jul 2018 |
| 12569 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 12570 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 12571 | Hedrick Production Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2026 |
| 12572 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 12573 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 12574 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 12575 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 12576 | Hehns Quality Gardens Inc | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 2024 |
| 12577 | Heifer Production Company LLC | Houston, TX 77098 | Oil & Gas Operator | Jun 2026 |
| 12578 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Jun 2026 |
| 12579 | Heim Time Farms, LLC | | Oil Operator | Dec 2025 |
| 12580 | Heim, William J. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 12581 | Heineman, Ronald F. | Caledonia, NY 14423 | Gas Operator | Dec 2024 |
| 12582 | Heinrich Enterprises Inc Dba Washington Operations | Reno, OH 45773 | Oil & Gas Operator | Dec 2025 |
| 12583 | Heinrich Enterprises, Inc. | Reno, OH 45773-0305 | Oil & Gas Operator | Dec 2021 |
| 12584 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 12585 | Heintz Gas & Oil Company, Inc. | Allegany, NY 14706 | Gas Operator | Dec 2024 |
| 12586 | Heisey Ventures, Inc. | Houston, TX 77019 | Oil & Gas Operator | Jun 2026 |
| 12587 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 12588 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 12589 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 12590 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 12591 | Helemrich & Payne Inc | Iraan, TX 79744 | Oil & Gas Operator | Sep 2002 |
| 12592 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 12593 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Mar 2026 |
| 12594 | Helena Resources LLC | Helena, OK 73741 | Oil & Gas Operator | Mar 2026 |
| 12595 | Helios Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 12596 | Helis Oil & Gas Company LLC Estate | New Orleans, LA 70130 | Oil & Gas Operator | Jul 2022 |
| 12597 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 12598 | Helis, William G. Co., LLC, The | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2003 |
| 12599 | Helis,WM.G.,Est., A Partnership | New Orleans, LA 70130 | Oil & Gas Operator | Aug 2003 |
| 12600 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |