| 13001 | Hicon Gas Producers, Inc. | New York, NY 10110 | Oil & Gas Operator | Oct 1999 |
| 13002 | Hidalgo Oil & Exploration Corp. | New Braunfels, TX 78131 | Oil & Gas Operator | Nov 2024 |
| 13003 | Hiebert & Wedel | | Oil & Gas Operator | May 1995 |
| 13004 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 13005 | Higginbotham, O. V. | Cedar Park, TX 78613 | Oil & Gas Operator | Jul 1996 |
| 13006 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Jul 2024 |
| 13007 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 13008 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 13009 | High Chapparal Oil Company | Plntersville, TX 77363 | Oil & Gas Operator | Aug 2003 |
| 13010 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Nov 2024 |
| 13011 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Aug 2024 |
| 13012 | High Island Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 13013 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 13014 | High McDonald Operating Co | Norman, OK 73072-7607 | Oil Operator | May 2024 |
| 13015 | High Mountain Oil & Gas | Hobbs, NM 88240 | Oil & Gas Operator | Jan 2019 |
| 13016 | High Mountain Oil & Gas, LLC | Hobbs, NM 88240 | Oil & Gas Operator | Nov 2024 |
| 13017 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Nov 2024 |
| 13018 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 13019 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 13020 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2024 |
| 13021 | High Plains Oil | | Oil Operator | Jun 1989 |
| 13022 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
| 13023 | High Plains Operating, LLC | | Oil Operator | Sep 2024 |
| 13024 | High Plains Petroleum Corp | Boulder, CO 80305 | Oil & Gas Operator | Jan 2021 |
| 13025 | High Plains Petroleum LLC | Bentonville, AR 72712 | Gas Operator | Jun 2024 |
| 13026 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Jul 2024 |
| 13027 | High River Res Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Nov 2024 |
| 13028 | High River Resources Operating LLC | Farmington, NM 87401 | Oil & Gas Operator | Sep 2024 |
| 13029 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 13030 | High Sierra Operating, LTD. | Canyon Lake, TX 78133 | Oil & Gas Operator | Mar 2008 |
| 13031 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 13032 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 13033 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 13034 | High Splint Gas & Oil, Inc | Greenville, KY 42345 | Oil Operator | Dec 2022 |
| 13035 | High Summit Oil & Gas Inc | | Oil & Gas Operator | Sep 1987 |
| 13036 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 13037 | High-Line Production Services LLC | | Oil & Gas Operator | Aug 2024 |
| 13038 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Nov 2024 |
| 13039 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 13040 | Highground, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2024 |
| 13041 | Highhouse James R | Warren, PA 16365-7550 | Oil & Gas Operator | Dec 2008 |
| 13042 | Highland Energy Co | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 13043 | Highland Exploration | | Oil Operator | Sep 1979 |
| 13044 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 13045 | Highland Oil & Gas Co | Mason, OH 45040 | Oil Operator | Dec 2022 |
| 13046 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 13047 | Highland Oil Co. | | Oil Operator | Mar 1953 |
| 13048 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 13049 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 13050 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jul 2024 |
| 13051 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 13052 | Highline Exploration, Inc. | Tuscaloosa, AL 35402 | Gas Operator | Nov 2020 |
| 13053 | Highman Oil & Gas LLC | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2023 |
| 13054 | Highmark Energy Operating, LLC | Poynor, TX 75782 | Oil & Gas Operator | Nov 2024 |
| 13055 | Highmount Black Warrior Basin, LLC | | Gas Operator | Jul 2010 |
| 13056 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 13057 | Highmount Midwest Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 13058 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 13059 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 13060 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 13061 | Highpointe Oil & Gas LLC | Indiana, PA 15701-8944 | Gas Operator | Dec 2023 |
| 13062 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Sep 2024 |
| 13063 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | Nov 2024 |
| 13064 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 13065 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 13066 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 13067 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 13068 | Hiko Bell Mining & Oil Co | Vernal, UT 84078 | Oil & Gas Operator | Oct 2003 |
| 13069 | Hiland Energy LP | Enid, OK 73701-0032 | Oil & Gas Operator | Dec 2022 |
| 13070 | Hilbers Oil & Gas | Archer City, TX 76351 | Oil & Gas Operator | Oct 2002 |
| 13071 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 13072 | Hilcorp Alaska, LLC | | Oil & Gas Operator | Sep 2024 |
| 13073 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2024 |
| 13074 | Hilcorp North Slope, LLC | | Oil & Gas Operator | Sep 2024 |
| 13075 | Hilden Oil Co Inc | | Oil & Gas Operator | Oct 2024 |
| 13076 | Hildreth, Roy G & Son Inc | Spencer, WV 25276 | Oil & Gas Operator | Dec 2021 |
| 13077 | Hildreth, Va Roy | | Oil & Gas Operator | Dec 1996 |
| 13078 | Hildreth, William H & David Dale | | Oil & Gas Operator | Dec 2021 |
| 13079 | Hill Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1997 |
| 13080 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 13081 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 13082 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 13083 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Aug 2024 |
| 13084 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 13085 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 13086 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 13087 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 13088 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 13089 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 13090 | Hill William F | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1993 |
| 13091 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 13092 | Hill, A G | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13093 | Hill, Albert, Trust | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 13094 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 13095 | Hill, Charles Drilling, Inc. | Grand Prairie, TX 75052 | Oil & Gas Operator | Nov 2024 |
| 13096 | Hill, Gillman A | Englewood, CO 80112 | Oil & Gas Operator | Jun 1993 |
| 13097 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 13098 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 13099 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 13100 | Hill-Lake Gas Storage, L.P. | Houston, TX 77057 | Oil & Gas Operator | Aug 2010 |