| 1901 | HARDAWAY | Adams County, CO | Oil Property | Dec 1999 |
| 1902 | HARDBARGER | Ritchie County, WV | Oil & Gas Property | Dec 2021 |
| 1903 | HARDBARGER | Ritchie County, WV | Oil & Gas Property | Dec 2021 |
| 1904 | HARDBERGER | Gaines County, TX | Oil & Gas Property | Aug 2025 |
| 1905 | HARDCASTLE | Jackson County, MI | Oil & Gas Property | Dec 2025 |
| 1906 | HARDCASTLE | Johnson County, TX | Oil & Gas Property | Nov 2025 |
| 1907 | HARDCASTLE | Oklahoma County, OK | Oil Property | Nov 2025 |
| 1908 | HARDCASTLE STATE 27-34-39 | Reeves County, TX | Oil & Gas Property | Oct 2025 |
| 1909 | HARDEE | Mitchell County, TX | Oil & Gas Property | Nov 2025 |
| 1910 | HARDEMAN | Caldwell County, TX | Oil & Gas Property | Nov 2025 |
| 1911 | HARDEMAN | Caldwell County, TX | Oil & Gas Property | Nov 2025 |
| 1912 | HARDEMAN | Lee County, TX | Oil & Gas Property | Oct 2025 |
| 1913 | HARDEMAN DOROTHY JEAN | Denton County, TX | Gas Property | Nov 2025 |
| 1914 | HARDEMAN-HARDEMAN (SA) A 1H | Denton County, TX | Gas Property | Nov 2025 |
| 1915 | HARDEMAN-TURNER UNIT | Caldwell County, TX | Oil & Gas Property | Nov 2025 |
| 1916 | HARDEMAN/SAVOIE 1H | Denton County, TX | Oil & Gas Property | Nov 2025 |
| 1917 | HARDEN | Nowata County, OK | Gas Property | Jul 2017 |
| 1918 | HARDEN | Alfalfa County, OK | Oil & Gas Property | Nov 2025 |
| 1919 | HARDEN | Greene County, PA | Gas Property | Dec 2025 |
| 1920 | HARDEN | Hughes County, OK | Oil & Gas Property | Dec 2025 |
| 1921 | HARDEN | Hockley County, TX | Oil & Gas Property | Nov 2025 |
| 1922 | HARDEN | Roger Mills County, OK | Oil & Gas Property | Nov 2025 |
| 1923 | HARDEN | Clark County, KS | Oil & Gas Property | Jun 2024 |
| 1924 | HARDEN FARMS ROG230H | Greene County, PA | Gas Property | Dec 2025 |
| 1925 | HARDER | Chase County, KS | Gas Property | Aug 2021 |
| 1926 | HARDER | Glacier County, MT | Gas Property | Aug 2013 |
| 1927 | HARDER | Allegany County, NY | Oil Property | Dec 2022 |
| 1928 | HARDER BROUSSARD UNIT | Jefferson County, TX | Oil & Gas Property | Oct 2025 |
| 1929 | HARDER L | Allegany County, NY | Gas Property | Dec 2000 |
| 1930 | HARDESTY | Sheridan County, KS | Oil Property | Jan 2008 |
| 1931 | HARDESTY | Sheridan County, WY | Gas Property | Feb 2013 |
| 1932 | HARDESTY | Red Willow County, NE | Oil Property | Dec 2024 |
| 1933 | HARDESTY | Sumner County, KS | Oil Property | Jul 2025 |
| 1934 | HARDESTY | Weld County, CO | Oil & Gas Property | Mar 2018 |
| 1935 | HARDESTY | Grady County, OK | Oil & Gas Property | Nov 2025 |
| 1936 | HARDESTY | Grady County, OK | Oil & Gas Property | Nov 2025 |
| 1937 | HARDESTY | Neosho County, KS | Oil Property | Apr 1987 |
| 1938 | HARDESTY A-HOOKS 4 USW | Dewitt County, TX | Oil & Gas Property | Nov 2025 |
| 1939 | HARDESTY UNIT A | Dewitt County, TX | Oil & Gas Property | Nov 2025 |
| 1940 | HARDGRAVE | Logan County, AR | Gas Property | Jun 2024 |
| 1941 | HARDGRAVE, BEN | Johnson County, AR | Gas Property | Jun 2024 |
| 1942 | HARDIE | San Juan County, NM | Oil & Gas Property | Dec 2025 |
| 1943 | HARDIE | San Juan County, NM | Oil & Gas Property | Dec 2025 |
| 1944 | HARDIE | Greene County, PA | Oil & Gas Property | Dec 2025 |
| 1945 | HARDIN | Le Flore County, OK | Gas Property | Nov 2025 |
| 1946 | HARDIN | Jack County, TX | Oil & Gas Property | Oct 2025 |
| 1947 | HARDIN | Claiborne Parish, LA | Oil & Gas Property | May 2012 |
| 1948 | HARDIN | Martin County, TX | Oil & Gas Property | Mar 2023 |
| 1949 | HARDIN | Hemphill County, TX | Oil & Gas Property | Nov 2025 |
| 1950 | HARDIN | Pottawatomie County, OK | Oil & Gas Property | Jul 2019 |
| 1951 | HARDIN | Wilson County, KS | Oil & Gas Property | Oct 2023 |
| 1952 | HARDIN | Wilson County, TX | Oil & Gas Property | Oct 2025 |
| 1953 | HARDIN | Young County, TX | Oil & Gas Property | Nov 2025 |
| 1954 | HARDIN | Panola County, TX | Oil & Gas Property | Nov 2025 |
| 1955 | HARDIN | Martin County, KY | Gas Property | Dec 2023 |
| 1956 | HARDIN | Wheeler County, TX | Oil & Gas Property | Nov 2025 |
| 1957 | HARDIN | Martin County, TX | Oil & Gas Property | Feb 2025 |
| 1958 | HARDIN | Carter County, OK | Oil & Gas Property | Nov 2025 |
| 1959 | HARDIN | Frio County, TX | Oil & Gas Property | Feb 2023 |
| 1960 | HARDIN | Kay County, OK | Oil Property | Nov 2025 |
| 1961 | HARDIN | Wagoner County, OK | Gas Property | Nov 2008 |
| 1962 | HARDIN | Lea County, NM | Oil & Gas Property | Dec 2001 |
| 1963 | HARDIN 2212 | Major County, OK | Oil & Gas Property | Nov 2025 |
| 1964 | HARDIN COUNTY O | Hardin County, TX | Oil & Gas Property | Nov 2025 |
| 1965 | HARDIN E. E | Wichita County, TX | Oil & Gas Property | Nov 2025 |
| 1966 | HARDIN FAMILY, LLC | Barbour County, WV | Oil & Gas Property | Dec 2021 |
| 1967 | HARDIN LITTLE 1-16H | Seminole County, OK | Gas Property | Dec 2025 |
| 1968 | HARDIN, CATHERINE | Pike County, KY | Oil & Gas Property | Dec 2023 |
| 1969 | HARDIN, D | Clinton County, KY | Oil Property | Dec 2009 |
| 1970 | HARDIN, JOHN F | Martin County, KY | Gas Property | Dec 2023 |
| 1971 | HARDIN, LARRY | Monroe County, KY | Oil Property | Dec 2011 |
| 1972 | HARDIN, T J | Martin County, KY | Oil & Gas Property | Dec 2023 |
| 1973 | HARDIN-JOHNSTON-STARNES | Hutchinson County, TX | Oil & Gas Property | Nov 2025 |
| 1974 | HARDIN-RAYES | McMullen County, TX | Oil & Gas Property | Nov 2025 |
| 1975 | HARDIN-SIMMONS | Shelby County, TX | Oil & Gas Property | Nov 2025 |
| 1976 | HARDIN-SIMMONS CRE | Reeves County, TX | Oil & Gas Property | Aug 2019 |
| 1977 | HARDIN-STATE 1 | Reeves County, TX | Oil & Gas Property | Nov 2025 |
| 1978 | HARDING | Latimer County, OK | Gas Property | Nov 2025 |
| 1979 | HARDING | Chautauqua County, NY | Oil & Gas Property | Dec 2024 |
| 1980 | HARDING | Carroll County, OH | Oil & Gas Property | Dec 2024 |
| 1981 | HARDING | Yuma County, CO | Gas Property | Nov 2025 |
| 1982 | HARDING | Montgomery County, KS | Oil & Gas Property | Jan 2005 |
| 1983 | HARDING | Tuscarawas County, OH | Oil & Gas Property | Dec 2024 |
| 1984 | HARDING | Jack County, TX | Oil & Gas Property | Mar 2022 |
| 1985 | HARDING | Henderson County, KY | Oil Property | Dec 2011 |
| 1986 | HARDING | Coshocton County, OH | Oil & Gas Property | Dec 2024 |
| 1987 | HARDING | Yuma County, CO | Gas Property | Nov 2025 |
| 1988 | HARDING COLLEGE | Union Parish, LA | Gas Property | Jul 2024 |
| 1989 | HARDING ELMER | Muskingum County, OH | Oil & Gas Property | Dec 2016 |
| 1990 | HARDING FEE | Ward County, TX | Oil & Gas Property | Aug 2025 |
| 1991 | HARDING RANCH | Laramie County, WY | Oil & Gas Property | Dec 2025 |
| 1992 | HARDING THORSON FEE | Crook County, WY | Oil Property | Sep 2020 |
| 1993 | HARDING UNIT 1H | Tarrant County, TX | Oil & Gas Property | Nov 2025 |
| 1994 | HARDING, SAM | Franklin County, AR | Gas Property | Jun 2024 |
| 1995 | HARDISON | Baylor County, TX | Oil & Gas Property | Nov 2023 |
| 1996 | HARDISON | Harper County, OK | Oil & Gas Property | Nov 2025 |
| 1997 | HARDISON | Muhlenberg County, KY | Oil Property | Apr 2019 |
| 1998 | HARDISON, B | Muhlenberg County, KY | Oil Property | Dec 2018 |
| 1999 | HARDMAN | Calhoun County, WV | Oil & Gas Property | Dec 2021 |
| 2000 | HARDMAN | Gilmer County, WV | Oil & Gas Property | Dec 2021 |