| 12901 | Hays, David H. | Olney, TX 76374 | Oil & Gas Operator | Dec 1995 |
| 12902 | Hays, John H. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 12903 | Hays, Mrs. Earl (Cora) | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2005 |
| 12904 | Hays, T.G. Petroleum Expl., Inc. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 12905 | Haysite Reinforced Plastics | Erie, PA 16509-3598 | Gas Operator | Dec 2024 |
| 12906 | Haywood, Paul M. Jr. | Denton, TX 76206 | Oil & Gas Operator | Mar 2002 |
| 12907 | Hazelett Oil Company, Inc. | Dale, TX 78616 | Oil & Gas Operator | Sep 2005 |
| 12908 | Hazelett Oil, Inc. | Dale, TX 78616 | Oil & Gas Operator | Aug 2024 |
| 12909 | Hazelwood Louis J | Albuquerque, NM 87111-6870 | Oil & Gas Operator | Feb 2023 |
| 12910 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Jan 2025 |
| 12911 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 12912 | Hazen, Paul D. | Great Bend, KS 67530 | Oil Operator | Nov 1990 |
| 12913 | Hazen, Ty Anthony | Lyons, KS 67554 | Oil Operator | Jan 2025 |
| 12914 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 12915 | HB Energy LLC | Wellsville, KS 66092 | Oil Operator | Jan 2025 |
| 12916 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 12917 | HBC Oil Company, LLC | San Antonio, TX 78266 | Oil Operator | May 2025 |
| 12918 | HC Resources, Inc. | | Oil & Gas Operator | Jul 2011 |
| 12919 | Hce Operating LLC | Smyer, TX 79367 | Oil & Gas Operator | May 2025 |
| 12920 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 12921 | HCL Inc | Woodward, OK 73802-1074 | Oil Operator | Mar 2015 |
| 12922 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 12923 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 12924 | HD Special-Situations, LP | San Francisco, CA 94111 | Oil & Gas Operator | Feb 2014 |
| 12925 | HD Well Services LLC | Wellsville, KS 66092 | Oil Operator | Jan 2025 |
| 12926 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Sep 2024 |
| 12927 | HDS Production | | Oil Operator | Mar 1998 |
| 12928 | HDT Inc. | | Oil & Gas Operator | Mar 2025 |
| 12929 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 12930 | Headington Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 1992 |
| 12931 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 12932 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 12933 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 12934 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 12935 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 12936 | Headwaters Energy Partners, LLC | Dripping SPGS, TX 78620 | Oil & Gas Operator | May 2025 |
| 12937 | Headwaters Oil Company | | Oil & Gas Operator | Oct 1981 |
| 12938 | Heape Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2020 |
| 12939 | Heape, Gene G. | Dallas, TX 75367 | Oil & Gas Operator | Jun 2003 |
| 12940 | Hearn Oil Co. LLC | Newport, OH 45768 | Oil & Gas Operator | Dec 2023 |
| 12941 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 12942 | Heartland Energy Company | Big Horn, WY 82833 | Gas Operator | Jun 2012 |
| 12943 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 12944 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 12945 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 12946 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 12947 | Heartland Oil & Gas Company | | Oil & Gas Operator | Jun 2000 |
| 12948 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 12949 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | May 2025 |
| 12950 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Feb 2025 |
| 12951 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 12952 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 12953 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 12954 | Heat Controller Inc | Jackson, MI 49204 | Oil & Gas Operator | Dec 1996 |
| 12955 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 12956 | Heath 91 Cluster LP | Commodore, PA 15729-9109 | Gas Operator | Dec 2020 |
| 12957 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 12958 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Feb 2025 |
| 12959 | Heath, Chad | Greensburg, KY 42743 | Oil Operator | Dec 2023 |
| 12960 | Heath, Francis A. & Ruth E. | South Dayton, NY 14138 | Gas Operator | Dec 2023 |
| 12961 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 12962 | Heather & Randy Iantorno Oil | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 12963 | Heatherly, Darl H. | Belington, WV 26250 | Gas Operator | Dec 2021 |
| 12964 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 12965 | Hebert & Rucks L.L.C. | | Oil & Gas Operator | May 2002 |
| 12966 | Hebron Energy, LLC | Dallas, TX 75206 | Oil Operator | Jul 2018 |
| 12967 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 12968 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 12969 | Hedrick Production Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2025 |
| 12970 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 12971 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 12972 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 12973 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 12974 | Hehns Quality Gardens Inc | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 2023 |
| 12975 | Heifer Production Company LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 12976 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | May 2025 |
| 12977 | Heim, William J. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 12978 | Heineman, Ronald F. | Caledonia, NY 14423 | Gas Operator | Dec 2023 |
| 12979 | Heinrich Enterprises Inc Dba Washington Operations | Reno, OH 45773 | Oil & Gas Operator | Dec 2024 |
| 12980 | Heinrich Enterprises, Inc. | Reno, OH 45773-0305 | Oil & Gas Operator | Dec 2021 |
| 12981 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 12982 | Heintz Gas & Oil Company, Inc. | Allegany, NY 14706 | Gas Operator | Dec 2023 |
| 12983 | Heisey Ventures, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 12984 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 12985 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 12986 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 12987 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 12988 | Helemrich & Payne Inc | Iraan, TX 79744 | Oil & Gas Operator | Sep 2002 |
| 12989 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 12990 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Apr 2025 |
| 12991 | Helios Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 12992 | Helis Oil & Gas Company LLC Estate | New Orleans, LA 70130 | Oil & Gas Operator | Jul 2022 |
| 12993 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 12994 | Helis, William G. Co., LLC, The | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2003 |
| 12995 | Helis,WM.G.,Est., A Partnership | New Orleans, LA 70130 | Oil & Gas Operator | Aug 2003 |
| 12996 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 12997 | Hell Creek Crude LLC | Winnett, MT 59087 | Oil Operator | Mar 2025 |
| 12998 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 12999 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 13000 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2025 |