| 2025 | Howard G Buffett Foundation | 990PF | President | 40 | $707,725 | $23,018 | View return |
| 2025 | The Nature Conservation Trust | 990PF | Trustee | 7 | $100,000 | - | View return |
| 2025 | Charity Fund - the Ukraine Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2025 | Icat Training Foundation | 990PF | Director | 1 | $0 | - | View return |
| 2025 | Center to Combat Human Trafficking | 990PF | Secretary | 0.5 | $0 | - | View return |
| 2025 | Fundacion Para La Paz Y La Seguridad | 990PF | Secretary | 1 | $0 | - | View return |
| 2025 | Friends of the Ukraine Foundation | 990PF | Director | 1 | $0 | - | View return |
| 2025 | Macon County Public Safety Training Foundation | 990PF | Director | 1 | $0 | - | View return |
| 2024 | Howard G Buffett Foundation | 990PF | President | 40 | $632,388 | $22,418 | View return |
| 2024 | The Nature Conservation Trust | 990PF | Trustee | 7 | $100,000 | - | View return |
| 2024 | Center to Combat Human Trafficking | 990PF | Secretary | 0.5 | $0 | - | View return |
| 2024 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2024 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 1 | $0 | - | View return |
| 2024 | Charity Fund - the Ukraine Foundation | 990PF | Director | 1 | $0 | - | View return |
| 2023 | Howard G Buffett Foundation | 990PF | President | 40 | $595,728 | $19,928 | View return |
| 2023 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 1 | $0 | - | View return |
| 2023 | Center to Combat Human Trafficking | 990PF | Secretary | 0.5 | $0 | - | View return |
| 2023 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2023 | The Nature Conservation Trust | 990PF | Trustee | 1 | $0 | - | View return |
| 2022 | Howard G Buffett Foundation | 990PF | President | 40 | $602,140 | $1,470 | View return |
| 2022 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 1 | $0 | - | View return |
| 2022 | The Nature Conservation Trust | 990PF | Trustee | 1 | $0 | - | View return |
| 2022 | Center to Combat Human Trafficking | 990PF | Secretary | 0.5 | $0 | - | View return |
| 2022 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2021 | Howard G Buffett Foundation | 990PF | President | 40 | $571,562 | $1,116 | View return |
| 2021 | The Nature Conservation Trust | 990PF | Trustee | 3 | $0 | - | View return |
| 2021 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 1 | $0 | - | View return |
| 2021 | Center to Combat Human Trafficking | 990PF | Secretary | 1 | $0 | - | View return |
| 2021 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2020 | Howard G Buffett Foundation | 990PF | President | 40 | $537,644 | $1,066 | View return |
| 2020 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 1 | $0 | - | View return |
| 2020 | Center to Combat Human Trafficking | 990PF | Director | 1 | $0 | - | View return |
| 2020 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2020 | The Nature Conservation Trust | 990PF | Trustee | 3 | $0 | - | View return |
| 2019 | Howard G Buffett Foundation | 990PF | President | 40 | $408,135 | $1,056 | View return |
| 2019 | Center to Combat Human Trafficking | 990PF | Director | 2 | $0 | - | View return |
| 2019 | Fundacion Para La Paz Y La Seguridad | 990PF | Director | 2 | $0 | - | View return |
| 2019 | Sequoia Farm Foundation | 990PF | Secretary | 1 | $0 | - | View return |
| 2017 | Virunga Fund Inc | 990 | Director | 2.5 | $0 | $0 | View return |
| 2016 | Virunga Fund Inc | 990 | Director | 5 | $0 | $0 | View return |
| 2016 | Virunga Fund Inc | 990 | Director | 5 | $0 | $0 | View return |