| 2025 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | - | View return |
| 2024 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | - | View return |
| 2024 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2023 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | - | View return |
| 2023 | Lake Geneva Heritage Center | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2023 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2022 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | - | View return |
| 2022 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2022 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2021 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | $0 | View return |
| 2021 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2021 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2020 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | $0 | View return |
| 2020 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2020 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2019 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | $0 | View return |
| 2019 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2019 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2019 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2018 | Geneva Lake Association Inc. | 990EZ | Director At Large | 1 | $0 | - | View return |
| 2018 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2018 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2018 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2017 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | - | - | View return |
| 2017 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2017 | Lake Geneva Heritage Center | 990 | Vice Preside | - | $0 | $0 | View return |
| 2017 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2016 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2016 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | - | $0 | View return |
| 2016 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2015 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2015 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | - | - | View return |
| 2015 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2014 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2014 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2014 | Geneva Lake Water Safety Comm Inc. | 990 | Director | 0 | - | - | View return |
| 2013 | Friends of Kishwauketoe Ltd. | 990EZ | Member | 0 | $0 | - | View return |
| 2013 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2013 | Card Sound Sailing Club Inc | 990EZ | Race Committ | 2 | $0 | - | View return |
| 2012 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2011 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |
| 2010 | Otzen Family Foundation Inc. | 990PF | President/Director | 0 | $0 | $0 | View return |