| 2025 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 10 | $0 | $0 | View return |
| 2024 | Zoological Society of Philadelphia | 990 | Director | 6 | $0 | $0 | View return |
| 2024 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2024 | Ludington Public Library | 990 | Treasurer | 4 | $0 | $0 | View return |
| 2023 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2023 | Ludington Public Library | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2023 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2022 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | Ludington Public Library | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2021 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2021 | Ludington Public Library | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2021 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2020 | Ludington Public Library | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2020 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2020 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2019 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 5 | $0 | $0 | View return |
| 2019 | Kipp Administrative Services Corporation | 990 | Treasurer | 1 | $0 | $0 | View return |
| 2019 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2018 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 0 | $0 | $0 | View return |
| 2018 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2018 | Kipp Administrative Services Corporation | 990 | Treasurer | 1 | $0 | $0 | View return |
| 2017 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 3 | $0 | $0 | View return |
| 2017 | Main Line Animal Rescue Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2017 | Kipp Administrative Services Corporation | 990 | Treasurer | 1 | $0 | $0 | View return |
| 2017 | Zoological Society of Philadelphia | 990 | Director | 2 | $0 | $0 | View return |
| 2016 | Main Line Animal Rescue Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2016 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 3 | $0 | $0 | View return |
| 2016 | Kipp Administrative Services Corporation | 990 | Board Treasurer | 1 | $0 | $0 | View return |
| 2015 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 1.5 | $0 | $0 | View return |
| 2015 | Kipp Administrative Services Corporation | 990 | Board Treasurer | 1 | $0 | $0 | View return |
| 2014 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 1.5 | $0 | $0 | View return |
| 2014 | Impact100 Philadelphia Inc. | 990 | Treasurer | 12 | $0 | $0 | View return |
| 2014 | Mighty Writers | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | Kipp West Philadelphia Preparatory Charter School | 990 | Member | 0.8 | $0 | $0 | View return |
| 2014 | Kipp Philadelphia Charter School | 990 | Member | 0.8 | $0 | $0 | View return |
| 2013 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 1.5 | $0 | $0 | View return |
| 2013 | Kipp West Philadelphia Preparatory Charter School | 990 | Member | 0.8 | $0 | $0 | View return |
| 2013 | Kipp Philadelphia Charter School | 990 | Member | 0.8 | $0 | $0 | View return |
| 2012 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 1.5 | $0 | $0 | View return |
| 2011 | Hollenstein Ross Family Foundation C/O Susan K Hollenstein | 990PF | President | 1.5 | $0 | $0 | View return |