| 2024 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2024 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2024 | Hilbert College | 990 | Trustee (Thru 5/25) | 1 | $0 | $0 | View return |
| 2024 | United Way of Buffalo and Erie County | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2023 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2022 | Hauptman-Woodward Medical Research Institute Inc. | 990 | Board Member To 9/20/23 | 0.2 | $0 | $0 | View return |
| 2022 | Hauptman Woodward Foundation | 990 | Board Member To 9/30/23 | 0.2 | $0 | $0 | View return |
| 2022 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2021 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2020 | Hauptman-Woodward Medical Research Institute Inc. | 990 | Board Member | 0.2 | $0 | $0 | View return |
| 2020 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Buffalo Niagara Enterprise Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Hauptman Woodward Foundation | 990 | Board Member | 0.2 | $0 | $0 | View return |
| 2019 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2019 | Buffalo Niagara Partnership Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2019 | Buffalo Niagara Enterprise Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Hauptman-Woodward Medical Research Institute Inc. | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2019 | Hauptman Woodward Foundation | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2018 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2018 | Orchard Park Country Club Inc | 990 | Secretary | 2 | $0 | $0 | View return |
| 2018 | Hauptman-Woodward Medical Research Institute Inc. | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2018 | Hauptman Woodward Foundation | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2018 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | Orchard Park Country Club Inc | 990 | 2nd VP | 2 | $0 | $0 | View return |
| 2017 | Hauptman-Woodward Medical Research Institute Inc. | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2017 | Hauptman Woodward Foundation | 990 | Boardmember | 0.2 | $0 | $0 | View return |
| 2016 | Orchard Park Country Club Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2015 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 2 | $0 | $0 | View return |
| 2014 | Computers for Children Inc. | 990 | Advisory | 1 | $0 | $0 | View return |
| 2014 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 0 | $0 | $0 | View return |
| 2014 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 0 | $0 | $0 | View return |
| 2013 | Hilbert College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2012 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 0 | $0 | $0 | View return |
| 2011 | Oliver C Hamister and Julia L Hamister Family Foundation Inc. | 990PF | President | 0.25 | $0 | $0 | View return |