| 2024 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2024 | Koss Foundation Inc | 990PF | Pres/Sec/Tre | 0.5 | $0 | $0 | View return |
| 2024 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2023 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2023 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2023 | Koss Foundation Inc | 990PF | Pres/Sec/Tre | 0.5 | $0 | $0 | View return |
| 2022 | The Foundation of Shalom Park | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Museum of Flight Foundation | 990 | Trustee | 2 | $0 | $0 | View return |
| 2022 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2022 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2021 | Koss Foundation Inc | 990PF | Pres/Sec/Treas | 0.5 | $0 | $0 | View return |
| 2021 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2021 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2021 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2021 | The Foundation of Shalom Park | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2020 | The Foundation of Shalom Park | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Milwaukee Film Inc | 990 | Finance Committee Co-Chair | 1 | $0 | $0 | View return |
| 2020 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2020 | Koss Foundation Inc | 990PF | Secry/Treas | 0.5 | $0 | $0 | View return |
| 2019 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2019 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2019 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2019 | The Foundation of Shalom Park | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2018 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2018 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2017 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2017 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2017 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2016 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2016 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2016 | Brandeis University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | Brandeis University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2015 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2015 | Milwaukee Film Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2015 | Brandeis University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2014 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2014 | Brandeis University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Museum of Flight Foundation | 990 | Trustee | 10 | $0 | $0 | View return |
| 2013 | Michael Koss Charitable Foundation | 990PF | President | 0 | $0 | $0 | View return |
| 2013 | Birthright Israel Foundation | 990 | Director (Thru 06/06/2013) | 2 | $0 | $0 | View return |
| 2013 | Brandeis University | 990 | Trustee | 1 | - | - | View return |