| 2024 | The Thomas and Stacey Siebel | 990PF | President | 1 | $0 | $0 | View return |
| 2024 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2023 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2023 | The Thomas and Stacey Siebel | 990PF | President | 1 | $0 | $0 | View return |
| 2022 | United States Sailing Foundation | 990 | Trustee (To 1/22) | 1 | $0 | $0 | View return |
| 2022 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2022 | The Thomas and Stacey Siebel | 990PF | President | 1 | $0 | $0 | View return |
| 2021 | United States Sailing Foundation | 990 | Member At Large | 1 | $0 | $0 | View return |
| 2021 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2021 | The Thomas and Stacey Siebel | 990PF | President | 1 | $0 | $0 | View return |
| 2020 | Siebel Energy Institute | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2020 | United States Sailing Foundation | 990 | Member At Large | 1 | $0 | $0 | View return |
| 2020 | The Thomas and Stacey Siebel | 990PF | President | 1 | $0 | $0 | View return |
| 2020 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2019 | United States Sailing Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2019 | The Siebel Scholars Foundation | 990PF | President | 1 | $0 | $0 | View return |
| 2019 | Siebel Energy Institute | 990 | Chairman | 2 | $0 | $0 | View return |
| 2019 | The American Agora Foundation Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2018 | United States Sailing Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | The Siebel Scholars Foundation | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2018 | Siebel Energy Institute | 990 | Chair Of The Board And Director | 2 | $0 | $0 | View return |
| 2018 | The American Agora Foundation Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2017 | United States Sailing Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | Siebel Energy Institute | 990 | Chair Of The Board And Director | 2 | $0 | $0 | View return |
| 2017 | The Siebel Scholars Foundation | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2016 | The Siebel Scholars Foundation | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2016 | Energy Free Home Foundation | 990PF | Director & Chairman | 0 | $0 | $0 | View return |
| 2016 | Siebel Energy Institute | 990 | Chair Of The Board And Director | 2 | $0 | $0 | View return |
| 2015 | Energy Free Home Foundation | 990PF | Director & Chairman | 0 | $0 | $0 | View return |
| 2015 | Siebel Energy Institute | 990 | Chair Of The Board And Director | 2 | $0 | $0 | View return |
| 2015 | The Siebel Scholars Foundation | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2015 | The American Agora Foundation Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | Energy Free Home Foundation | 990PF | Director & Chairman | 0 | $0 | $0 | View return |
| 2014 | The Siebel Scholars Foundation | 990PF | Chairman | 1 | $0 | $0 | View return |
| 2014 | The Meth Project Foundation | 990PF | President/CEO | 0 | $0 | $0 | View return |
| 2014 | The American Agora Foundation Inc | 990 | Chairman | 2 | $0 | $0 | View return |
| 2013 | The American Agora Foundation Inc | 990 | Chairman | 2 | $0 | $0 | View return |