| Roger B & Evelyn W Paddison Charitable Foundation | | Knoxville, TN | Local | 7 | 2024 | $84,000 |
| Haslam Family Foundation Inc | | Knoxville, TN | Local | 5 | 2024 | $62,500 |
| Enterprise Bank & Trust Foundation | | Saint Louis, MO | Local | 1 | 2024 | $100 |
| East Tennessee Foundation | | Knoxville, TN | Local | 6 | 2023 | $3,035,218 |
| National Park Foundation | | Washington, DC | National | 7 | 2023 | $679,952 |
| The Community Foundation of Western North Carolina Inc | | Asheville, NC | Local | 1 | 2022 | $6,350 |
| The William E and Audrine C Honey Foundation Inc | | | — | 1 | 2022 | $3,000 |
| Arconic Foundation | | Pittsburgh, PA | National | 2 | 2021 | $55,000 |
| Battelle Memorial Institute | | Columbus, OH | Local | 1 | 2021 | $5,250 |
| Westrock Foundation | | Atlanta, GA | National | 2 | 2021 | $113 |
| The National Environmental Education and Training Foundation | | Washington, DC | National | 2 | 2020 | $30,000 |
| The William B Stokely Jr Foundation | | Knoxville, TN | Local | 2 | 2020 | $15,200 |
| The Fullgraf Foundation | | Wilmington, DE | National | 2 | 2020 | $4,000 |
| Stocker Foundation | | Elyria, OH | National | 1 | 2020 | $200 |
| Aon Foundation | | Chicago, IL | National | 1 | 2020 | $50 |
| Act Foundation Inc | | Atlanta, GA | Local | 1 | 2019 | $50,000 |
| Warren and Zoann Little Dusenbury Charity Trust | | | — | 1 | 2018 | $10,000 |
| Patagoniaorg | | | National | 2 | 2018 | $7,500 |