| 2025 | Circle X Ranch Foundation | 990EZ | Board Member | 1 | $0 | - | View return |
| 2025 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2024 | Circle X Ranch Foundation | 990EZ | Board Member | 1 | $0 | - | View return |
| 2024 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2024 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2023 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2023 | Circle X Ranch Foundation | 990EZ | Board Member | 1 | $0 | - | View return |
| 2023 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2022 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2022 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2021 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2021 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2020 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2020 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2019 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2019 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2018 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2018 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2017 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2017 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2016 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2016 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2015 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2015 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2014 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2014 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | $0 | $0 | View return |
| 2013 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2013 | National Baseball Hall of Fame and Museum Inc. | 990 | Director | 4 | - | - | View return |
| 2012 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2011 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |
| 2010 | Wm O and Margaret H Dewitt Foundation | 990PF | Pres/Treas | 2 | $0 | $0 | View return |