| 12901 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 12902 | Higginbotham, O. V. | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 1996 |
| 12903 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | May 2026 |
| 12904 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 12905 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 12906 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 12907 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Sep 2026 |
| 12908 | High Energy | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2026 |
| 12909 | High Island Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 12910 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 12911 | High McDonald Operating Co | Norman, OK 73072-7607 | Oil Operator | May 2026 |
| 12912 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 12913 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Sep 2026 |
| 12914 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Sep 2026 |
| 12915 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 12916 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 12917 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 2026 |
| 12918 | High Plains Oil | | Oil Operator | Jun 1989 |
| 12919 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
| 12920 | High Plains Operating, LLC | | Oil Operator | Jun 2026 |
| 12921 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |
| 12922 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 12923 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Sep 2026 |
| 12924 | High River Resources Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Jul 2026 |
| 12925 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 12926 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 12927 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 12928 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 12929 | High Splint Gas & Oil, Inc | Greenville, KY 42345 | Oil Operator | Dec 2023 |
| 12930 | High Summit Oil & Gas Inc | | Oil & Gas Operator | Sep 1987 |
| 12931 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 12932 | High-Line Production Services LLC | | Oil & Gas Operator | Jul 2026 |
| 12933 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Sep 2026 |
| 12934 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 12935 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Sep 2026 |
| 12936 | Highhouse James R | Warren, PA 16365-7550 | Oil & Gas Operator | Dec 2008 |
| 12937 | Highland Exploration | | Oil Operator | Sep 1979 |
| 12938 | Highland Minerals Inc | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 12939 | Highland Oil & Gas Co | Mason, OH 45040 | Oil Operator | Dec 2022 |
| 12940 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 12941 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 12942 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 12943 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 12944 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 12945 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 12946 | Highline Exploration, Inc. | Tuscaloosa, AL 35402 | Gas Operator | Nov 2020 |
| 12947 | Highline Operating, LLC | Oklahoma City, OK 73159 | Gas Operator | Jun 2026 |
| 12948 | Highman Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2025 |
| 12949 | Highmark Energy Operating, LLC | Houston, TX 77253 | Oil & Gas Operator | Sep 2026 |
| 12950 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 12951 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 12952 | Highmount Midwest Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 12953 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 12954 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 12955 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 12956 | Highpointe Oil & Gas LLC | Indiana, PA 15701-8944 | Gas Operator | Dec 2025 |
| 12957 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Jun 2026 |
| 12958 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2026 |
| 12959 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 12960 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 12961 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 12962 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 12963 | Hiko Bell Mining & Oil Co | Vernal, UT 84078 | Oil & Gas Operator | Oct 2003 |
| 12964 | Hilbers Oil & Gas | Archer City, TX 76351 | Oil & Gas Operator | Oct 2002 |
| 12965 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 12966 | Hilcorp Alaska, LLC | | Oil & Gas Operator | Mar 2026 |
| 12967 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Sep 2026 |
| 12968 | Hilcorp North Slope, LLC | | Oil & Gas Operator | Dec 2025 |
| 12969 | Hilden Oil Co Inc | | Oil & Gas Operator | Oct 2024 |
| 12970 | Hildreth, Roy G & Son Inc | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 12971 | Hildreth, Va Roy | | Oil & Gas Operator | Dec 1996 |
| 12972 | Hill Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1997 |
| 12973 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 12974 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 12975 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 12976 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Jun 2026 |
| 12977 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 12978 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 12979 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 12980 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 12981 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 12982 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 12983 | Hill William F | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1993 |
| 12984 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 12985 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 12986 | Hill, Albert, Trust | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 12987 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 12988 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Sep 2026 |
| 12989 | Hill, Gillman A | Englewood, CO 80112 | Oil & Gas Operator | Jun 1993 |
| 12990 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 12991 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 12992 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 12993 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |
| 12994 | Hill-Lake Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2026 |
| 12995 | Hillary Oil Comp | | Oil & Gas Operator | Apr 1991 |
| 12996 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 12997 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 12998 | Hillenburg Oil Co., A General Partnership | Broken Arrow, OK 74011 | Oil Operator | May 2026 |
| 12999 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 13000 | Hilliard Oil | Bronte, TX 76933 | Oil & Gas Operator | Mar 2008 |