| 1901 | DPH NE 1H | Wyoming County, PA | Gas Property | Jun 2025 |
| 1902 | DPH NW | Wyoming County, PA | Gas Property | Jun 2025 |
| 1903 | DPH SE | Wyoming County, PA | Gas Property | Jun 2025 |
| 1904 | DPH SW | Wyoming County, PA | Gas Property | Jun 2025 |
| 1905 | DR C M SMITH | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 1906 | DR02 WT5201 CP | Forest County, PA | Oil & Gas Property | Jun 2025 |
| 1907 | DRACO | Butler County, PA | Gas Property | Jun 2025 |
| 1908 | DRAGON CHAN | Greene County, PA | Gas Property | Jun 2025 |
| 1909 | DRAKE | Bradford County, PA | Gas Property | Jun 2025 |
| 1910 | DRAKE | Butler County, PA | Gas Property | Jun 2025 |
| 1911 | DRAKULIC | Allegheny County, PA | Gas Property | Dec 2024 |
| 1912 | DRANN | Susquehanna County, PA | Gas Property | Jun 2025 |
| 1913 | DRAPE JAMES 18118 | Allegheny County, PA | Gas Property | Jun 2025 |
| 1914 | DRAYER | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1915 | DREHER A UNIT | Butler County, PA | Gas Property | Jun 2025 |
| 1916 | DREHER B UNIT | Butler County, PA | Oil & Gas Property | Jun 2025 |
| 1917 | DREW KIMMEL | Armstrong County, PA | Gas Property | Dec 2024 |
| 1918 | DRIFT RIDGE | Greene County, PA | Gas Property | Jun 2025 |
| 1919 | DRISCOLL | Bradford County, PA | Gas Property | Jun 2025 |
| 1920 | DROP | Westmoreland County, PA | Oil & Gas Property | Dec 2024 |
| 1921 | DROPP | Susquehanna County, PA | Gas Property | Jun 2025 |
| 1922 | DRUGGAN | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1923 | DRUGMAND UNIT | Washington County, PA | Oil & Gas Property | Jun 2025 |
| 1924 | DRUSHEL UNIT | Butler County, PA | Oil & Gas Property | Jun 2025 |
| 1925 | DUANE | Bradford County, PA | Gas Property | Jun 2025 |
| 1926 | DUBOIS 3 | Clearfield County, PA | Oil & Gas Property | Dec 2024 |
| 1927 | DUCHESS 00 | Westmoreland County, PA | Gas Property | Dec 2024 |
| 1928 | DUFF | Westmoreland County, PA | Gas Property | Jun 2025 |
| 1929 | DUFFIELD | Bradford County, PA | Gas Property | Jun 2025 |
| 1930 | DUFFY ESTATE D | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 1931 | DUHRING | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 1932 | DULCEY BRA | Bradford County, PA | Gas Property | Jun 2025 |
| 1933 | DUNCAN FORK | Washington County, PA | Oil & Gas Property | Dec 2024 |
| 1934 | DUNHAM | Bradford County, PA | Gas Property | Jun 2025 |
| 1935 | DUNLAP | Indiana County, PA | Gas Property | Dec 2024 |
| 1936 | DUNLAP-BARNETT UNIT | Clearfield County, PA | Gas Property | Dec 2024 |
| 1937 | DUNMIRE UNIT | Butler County, PA | Gas Property | Jun 2025 |
| 1938 | DUNN | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 1939 | DUNN | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1940 | DUNN CLINGERMAN UNIT | Washington County, PA | Oil & Gas Property | Jun 2025 |
| 1941 | DUNN JOHN UNIT | Washington County, PA | Oil & Gas Property | Jun 2025 |
| 1942 | DUNNY | Wyoming County, PA | Gas Property | Jun 2025 |
| 1943 | DUNSHIE D | Potter County, PA | Gas Property | Dec 2024 |
| 1944 | DUQUESNE LIGHT CO | Allegheny County, PA | Oil & Gas Property | Dec 2024 |
| 1945 | DURALIA 1 | Westmoreland County, PA | Gas Property | Jun 2025 |
| 1946 | DURBIN 00 | Clearfield County, PA | Gas Property | Dec 2024 |
| 1947 | DURKACS UNIT | Washington County, PA | Oil & Gas Property | Jun 2025 |
| 1948 | DURY | Washington County, PA | Gas Property | Dec 2024 |
| 1949 | DUSENBURY-WHEELER & MERSEREAU | Potter County, PA | Oil & Gas Property | Dec 2024 |
| 1950 | DUTTER | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 1951 | DWAINE & PENNI GARANSI | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 1952 | DWIGHT E BARKLEY | Indiana County, PA | Gas Property | Dec 2024 |
| 1953 | DWIGHT MCKIN | Armstrong County, PA | Gas Property | Dec 2024 |
| 1954 | DYDA UNIT | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 1955 | DYGERT | Crawford County, PA | Oil & Gas Property | Dec 2024 |
| 1956 | DYNAMITE | Armstrong County, PA | Gas Property | Jun 2025 |
| 1957 | DYNYS | Westmoreland County, PA | Oil & Gas Property | Dec 2024 |
| 1958 | DYSON W | Susquehanna County, PA | Gas Property | Jun 2025 |
| 1959 | DZIUBA | Bradford County, PA | Gas Property | Jun 2025 |
| 1960 | E & F SMITH | Crawford County, PA | Gas Property | Dec 2012 |
| 1961 | E A JOHNSON | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 1962 | E B BRANDON | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 1963 | E B WRIGHT | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 1964 | E BUNNELL | Susquehanna County, PA | Gas Property | Jun 2025 |
| 1965 | E C BEST | Armstrong County, PA | Gas Property | Dec 2024 |
| 1966 | E CHARLES HERRICK | Crawford County, PA | Gas Property | Dec 2021 |
| 1967 | E COGLEY ETUX | Armstrong County, PA | Gas Property | Dec 2024 |
| 1968 | E DANVIR | Clearfield County, PA | Gas Property | Dec 2024 |
| 1969 | E DICKEY | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 1970 | E E MITCHELL | Clearfield County, PA | Gas Property | Dec 2024 |
| 1971 | E E ROSS | Westmoreland County, PA | Gas Property | Dec 2024 |
| 1972 | E EUGENE COGLEY | Armstrong County, PA | Gas Property | Dec 2024 |
| 1973 | E GENE HOOVER | Clarion County, PA | Oil & Gas Property | Dec 2024 |
| 1974 | E H BRYNER | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 1975 | E HORVATH | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 1976 | E KROLCZYK 00 | Indiana County, PA | Gas Property | Dec 2024 |
| 1977 | E L MOLOWSKI | Fayette County, PA | Gas Property | Dec 2024 |
| 1978 | E M CARNAHAN | Indiana County, PA | Gas Property | Dec 2024 |
| 1979 | E M COGLEY | Armstrong County, PA | Gas Property | Dec 2024 |
| 1980 | E MCQUISTON | Mercer County, PA | Gas Property | Dec 2024 |
| 1981 | E O KANE | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 1982 | E R COST | Westmoreland County, PA | Gas Property | Dec 2024 |
| 1983 | E R WALTON | Venango County, PA | Oil Property | Dec 1999 |
| 1984 | E RINEHART | Greene County, PA | Oil & Gas Property | Dec 2024 |
| 1985 | E S BROWN | Indiana County, PA | Gas Property | Dec 2024 |
| 1986 | E SMITH | Mercer County, PA | Gas Property | Dec 2019 |
| 1987 | E WILLIAMS | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 1988 | E&N LAND | Fayette County, PA | Gas Property | Dec 2024 |
| 1989 | E.N. KUNKLE | Westmoreland County, PA | Gas Property | Dec 2024 |
| 1990 | E09-U HEMLOCK PAD 159H 51971 | Elk County, PA | Gas Property | Jun 2025 |
| 1991 | EA SMITH | Jefferson County, PA | Gas Property | Dec 2024 |
| 1992 | EAGAN | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 1993 | EAGLE LINE | Crawford County, PA | Gas Property | Dec 2024 |
| 1994 | EAGLE ROCK | Venango County, PA | Oil Property | Dec 2024 |
| 1995 | EAGLE ROCK WALTON | Venango County, PA | Oil Property | Dec 2024 |
| 1996 | EAGLEHOUSE | Westmoreland County, PA | Gas Property | Jun 2025 |
| 1997 | EAGLEROCK WALTON #1 | Venango County, PA | Oil Property | Dec 1999 |
| 1998 | EAGLES | Jefferson County, PA | Gas Property | Dec 2024 |
| 1999 | EAKER | Clarion County, PA | Gas Property | Dec 2015 |
| 2000 | EAKIN | Washington County, PA | Gas Property | Dec 2024 |