| 2025 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2022 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2022 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2021 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2021 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2021 | Bridgeport Regional Business Council | 990 | Board Member | 1 | $0 | $0 | View return |
| 2020 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2020 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2020 | Bridgeport Regional Business Council | 990 | Board Member | 1 | $0 | $0 | View return |
| 2020 | Danbury Hospital & New Milford Hospital Foundation Inc. | 990 | Director | 0.5 | $0 | $0 | View return |
| 2020 | Norwalk Hospital Foundation Inc. | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2019 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2019 | Bridgeport Regional Business Council | 990 | Board Member | 1 | $0 | $0 | View return |
| 2019 | Norwalk Hospital Foundation Inc. | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | Danbury Hospital & New Milford Hospital Foundation Inc. | 990 | Director | 0.5 | $0 | $0 | View return |
| 2018 | Bridgeport Regional Business Council | 990 | Board Member | 1 | $0 | $0 | View return |
| 2018 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2018 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2017 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2017 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2016 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2016 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2015 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2015 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2014 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2014 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2013 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2013 | Christian J and Eva W Trefz Family Foundation Inc. | 990PF | President, Director | 0.5 | $0 | $0 | View return |
| 2012 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2011 | Ernest and Joan Trefz Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |