| 2001 | H. B. McCullough | | Oil Operator | Oct 2004 |
| 2002 | H. D. McCormick | | Oil & Gas Operator | Jun 2016 |
| 2003 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 2004 | H. G. Oil Operator | | Oil Operator | Mar 2001 |
| 2005 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 2006 | H. K. Beebe | | Oil Operator | Jan 1990 |
| 2007 | H. L. McKee & J. P. McKee Jr. | | Gas Operator | Mar 2023 |
| 2008 | H. L. Richey | | Oil & Gas Operator | Sep 1995 |
| 2009 | H. Proler-Luffey Gas Corp. | | Gas Operator | Apr 1979 |
| 2010 | H.E. Sutton, Et Al | | Oil & Gas Operator | Jan 1990 |
| 2011 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 2012 | Habetz Oilfield Saltwater Ser, Inc | | Oil Operator | Dec 2024 |
| 2013 | Hackberry Production, Inc. | | Oil Operator | Mar 1988 |
| 2014 | Haddox Petroleum Corp | | Gas Operator | Dec 2010 |
| 2015 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 2016 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 2017 | Haffaday Oil LLC | | Oil Operator | Jan 2025 |
| 2018 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 2019 | Haland Operating Company, LLC | | Oil & Gas Operator | Jul 2018 |
| 2020 | Halbouty-Reserve | | Oil & Gas Operator | Sep 1987 |
| 2021 | Halbouty-Reserve-Pel-Tex | | Oil & Gas Operator | May 1985 |
| 2022 | Halcon Louisiana Operating, LP | | Oil & Gas Operator | Sep 2017 |
| 2023 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 2024 | Hale Oil | | Oil & Gas Operator | Dec 2024 |
| 2025 | Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 2026 | Hall Engineering, Inc. | | Oil & Gas Operator | Jan 2007 |
| 2027 | Hall-Hargraves, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 2028 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 2029 | Hallador Petroleum Company | | Oil & Gas Operator | Feb 1992 |
| 2030 | Hallar Enterprises, Inc. | | Oil Operator | Oct 2007 |
| 2031 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 2032 | Hallmark Oil And Gas Co., Inc. | | Oil & Gas Operator | Dec 2024 |
| 2033 | Hallwell Gas & Oil Co. | | Oil & Gas Operator | Sep 1985 |
| 2034 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 2035 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 2036 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 2037 | Hamilton Gas Co., Inc. | | Gas Operator | Mar 1999 |
| 2038 | Hamlin'S Production, Inc. | | Oil & Gas Operator | May 1981 |
| 2039 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Feb 2026 |
| 2040 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 2041 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 2042 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 2043 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 2044 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 2045 | Hanson Natural Resources Co. | | Oil & Gas Operator | Nov 1991 |
| 2046 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 2047 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 2048 | Harbert Energy Corp/Gulf Coast | | Oil & Gas Operator | Dec 1991 |
| 2049 | Harbor Operating, LLC | | Oil & Gas Operator | Dec 1999 |
| 2050 | Harbor Petroleum, LLC | Granbury, TX 76049 | Oil & Gas Operator | Feb 2026 |
| 2051 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 2052 | Hardco Inc | Cleveland, OH 44115 | Oil & Gas Operator | Dec 1992 |
| 2053 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Feb 2026 |
| 2054 | Hardey Production Company | | Oil Operator | Dec 1998 |
| 2055 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 2056 | Hargraves Daughters | | Oil Operator | Mar 1992 |
| 2057 | Hargraves Production, LLC | | Oil Operator | Jan 2025 |
| 2058 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 2059 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 2060 | Harrison & Lee | | Oil Operator | Sep 1996 |
| 2061 | Harry L. Neeb | | Oil Operator | May 1985 |
| 2062 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Feb 2026 |
| 2063 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 2064 | Harter Oil Company | | Oil & Gas Operator | Apr 2011 |
| 2065 | Harvard Investments, Inc. | | Oil & Gas Operator | Oct 2002 |
| 2066 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |
| 2067 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Feb 2026 |
| 2068 | Harvey Broyles | | Oil & Gas Operator | May 2012 |
| 2069 | Harvey Broyles & Munoco Co. | | Oil & Gas Operator | Jan 2002 |
| 2070 | Harvey Broyles, Et Al | | Gas Operator | Nov 1985 |
| 2071 | Hassie Hunt Expl. Co. | | Oil & Gas Operator | Aug 2008 |
| 2072 | Haw Corporation | | Oil Operator | Dec 1979 |
| 2073 | Hawk Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 2074 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 2075 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 2076 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 2077 | Hawthorne-Tipco | | Oil & Gas Operator | Oct 1978 |
| 2078 | Hayden Energy Corp. | | Oil & Gas Operator | Apr 1994 |
| 2079 | HC Resources, Inc. | | Oil & Gas Operator | Jul 2011 |
| 2080 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 2081 | HDS Production | | Oil Operator | Mar 1998 |
| 2082 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 2083 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 2084 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 2085 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 2086 | Headwaters Oil Company | | Oil & Gas Operator | Oct 1981 |
| 2087 | Hebert & Rucks L.L.C. | | Oil & Gas Operator | May 2002 |
| 2088 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 2089 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 2090 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 2091 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 2092 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2025 |
| 2093 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 2094 | Hemus, Inc. | Bellaire, TX 77401 | Oil & Gas Operator | Sep 1994 |
| 2095 | Henderson Oil & Gas | | Oil Operator | Sep 1990 |
| 2096 | Henderson Pet Corp Of Delaware | | Oil & Gas Operator | Oct 2019 |
| 2097 | Henderson Petroleum Corp | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2013 |
| 2098 | Henergy Oil & Gas LLC | | Oil Operator | Jan 2025 |
| 2099 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 2100 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |