| Walter Family Foundation | | Chicago, IL | Local | 7 | 2024 | $8,079,800 |
| American Association of Zoological Parks and Aquariums Inc | | Silver Spring, MD | National | 3 | 2024 | $1,675,696 |
| Arcus Foundation | | New York, NY | National | 6 | 2024 | $1,493,641 |
| Walder Family Foundation | | Skokie, IL | Local | 3 | 2024 | $1,299,991 |
| John D & Catherine T Macarthur Foundation | | Chicago, IL | National | 7 | 2024 | $926,450 |
| Indianapolis Zoological Society Inc | | Indianapolis, IN | National | 7 | 2024 | $395,000 |
| Fredericka Meyer Chrtbl Tr | | Chicago, IL | Local | 6 | 2024 | $386,000 |
| Chauncey and Marion Deering Mccormick Foundation | | Chicago, IL | National | 6 | 2024 | $350,000 |
| Shure Charitable Tr Created Uw of Sidney N Shure | | Chicago, IL | Local | 8 | 2024 | $345,000 |
| The Brinson Foundation | | Chicago, IL | Local | 5 | 2024 | $304,000 |
| The Buchanan Family Foundation | | Lake Forest, IL | Local | 7 | 2024 | $280,000 |
| Arie and Ida Crown Memorial | | Chicago, IL | Local | 5 | 2024 | $235,000 |
| Dr Scholl Foundation | | Northbrook, IL | Local | 7 | 2024 | $200,000 |
| Reid Park Zoological Society | | Tucson, AZ | National | 5 | 2024 | $125,750 |
| Mansueto Foundation | | Chicago, IL | Local | 5 | 2024 | $125,000 |
| Circle of Service Foundation | | Chicago, IL | Local | 5 | 2024 | $125,000 |
| John R Halligan Charitable Fund | | Bannockburn, IL | Local | 3 | 2024 | $110,000 |
| Frank and Karen Ptak Family Foundation | | Boca Raton, FL | Local | 5 | 2024 | $106,000 |
| Robert and Mayari Pritzker Family Foundation | | Cassville, WI | National | 5 | 2024 | $91,300 |
| Ernst & Young Foundation | | New York, NY | National | 2 | 2024 | $50,000 |
| John Shields Jr Trust Fbo Bessie Shields Foundation 89359-00-4 | | Chicago, IL | National | 7 | 2024 | $44,501 |
| Patrick and Anna M Cudahy Fund | | Oak Park, IL | Local | 7 | 2024 | $35,000 |
| The Maryland Zoological Society Inc | | Baltimore, MD | National | 4 | 2024 | $27,647 |
| Derse Foundation Inc | | | Local | 2 | 2024 | $25,378 |
| Sidley Austin Foundation | | Chicago, IL | National | 2 | 2024 | $22,500 |
| Castaways Foundation | | Chicago, IL | Local | 7 | 2024 | $22,000 |
| Detroit Zoological Society | | Royal Oak, MI | National | 2 | 2024 | $20,000 |
| Zell Family Foundation | | Chicago, IL | Local | 4 | 2024 | $20,000 |
| Tuttleman Foundation | | Erwinna, PA | National | 2 | 2024 | $20,000 |
| Francis Beidler Foundation | | Chicago, IL | Local | 7 | 2024 | $17,500 |
| Robert C and Deborah K Bridges Foundation | | Chicago, IL | Local | 3 | 2024 | $16,000 |
| Hinrichs Foundation Inc | | Chicago, IL | Local | 8 | 2024 | $15,500 |
| Sethness Family Foundation | | Northbrook, IL | National | 5 | 2024 | $14,500 |
| Geraldi Norton Foundation | | Wilmette, IL | National | 5 | 2024 | $5,000 |
| Roth Brothers Charitable Tr | | Chicago, IL | Local | 2 | 2024 | $4,500 |
| Solot and Karp Family Foundation | | Wilmington, DE | National | 7 | 2024 | $3,500 |
| Cvs Foundation | | Woonsocket, RI | National | 4 | 2024 | $3,000 |
| Reynolds Family Foundation | | Wilmington, DE | National | 1 | 2024 | $2,500 |
| Mary Curtis Horowitz Foundation | | Branchburg, NJ | Local | 1 | 2024 | $500 |
| Arthur D Collins Jr Foundation | | Naples, FL | Local | 1 | 2024 | $366 |
| Kovler Family Foundation | | Chicago, IL | Local | 4 | 2023 | $794,562 |
| Ncrc Community Development Fund Inc | | Washington, DC | Local | 1 | 2023 | $250,000 |
| Beatrice P Delaney Char Fdn | | Chicago, IL | Local | 5 | 2023 | $205,000 |
| Unaka Foundation Inc | | Greeneville, TN | Local | 1 | 2023 | $30,000 |
| Sunshine Charitable Foundation | | Libertyville, IL | National | 4 | 2023 | $10,000 |
| Polk Bros Foundation Inc | | Chicago, IL | Local | 4 | 2023 | $6,845 |
| The Williams Family Foundation | | Chicago, IL | Local | 3 | 2023 | $3,000 |
| Fulk Family Foundation Inc | | Chicago, IL | Local | 4 | 2022 | $2,764,459 |
| Seabury Foundation | | Chicago, IL | Local | 1 | 2022 | $16,000 |
| Openlands | | Chicago, IL | Local | 1 | 2022 | $7,847 |
| A Montgomery Ward Foundation 32 48652-4 | | Dallas, TX | Local | 1 | 2022 | $5,000 |
| Berghorst Foundation Inc | | Wilmington, DE | National | 2 | 2022 | $1,365 |
| Arkes Family Foundation | | Chicago, IL | Local | 5 | 2022 | $556 |
| Cornell University | | Ithaca, NY | National | 2 | 2021 | $155,610 |
| W F Foundation | | Chicago, IL | Local | 4 | 2021 | $27,500 |
| Arch W Shaw Foundation | | Birch Tree, MO | — | 1 | 2021 | $5,000 |
| Moller Family Foundation | | Chicago, IL | Local | 2 | 2021 | $3,000 |
| Todd & Stephanie Schnick Foundation | | | — | 2 | 2021 | $3,000 |
| Mondelez International Foundation | | Chicago, IL | National | 1 | 2021 | $160 |
| Grant Hospital of Chicago | | Lake Forest, IL | Local | 3 | 2020 | $135,000 |
| Glasser and Rosenthal Family Foundation | | | — | 1 | 2020 | $100,000 |
| Margot Marsh Biodiversity Foundation | | New York, NY | National | 2 | 2020 | $45,000 |
| Conservation Food and Health Foundation Inc | | Boston, MA | National | 1 | 2020 | $29,998 |
| Hobson Lucas Family Foundation | | San Rafael, CA | National | 1 | 2020 | $25,000 |
| Patrick G and Shirley W Ryan Foundation | | Chicago, IL | Local | 2 | 2020 | $15,000 |
| Illinois Tool Works Foundation | | | — | 1 | 2020 | $10,000 |
| Greater Green Bay Community Foundation Inc | | Green Bay, WI | Local | 1 | 2020 | $5,000 |
| Dallas Zoological Society | | Dallas, TX | Local | 1 | 2020 | $5,000 |
| Clune Family Charitable Foundation | | | — | 1 | 2020 | $3,000 |
| Richard and Mary L Gray Foundation | | | — | 3 | 2020 | $1,500 |
| Community Foundation of Northern Illinois | | Rockford, IL | Local | 3 | 2019 | $45,000 |
| United Way of Metropolitan Chicago Inc | | Chicago, IL | Local | 2 | 2018 | $46,734 |
| David Bohnett Foundation | | Beverly Hills, CA | Local | 1 | 2018 | $25,000 |
| Service Club of Chicago | | Chicago, IL | Local | 1 | 2018 | $24,993 |
| Edmond and Alice Opler Foundation | | Oak Lawn, IL | — | 1 | 2018 | $20,000 |
| Frederick Henry Prince Testamentary Trust | | Chicago, IL | National | 1 | 2018 | $10,000 |
| Atlanta-Fulton County Zoo Inc | | Atlanta, GA | Local | 1 | 2018 | $10,000 |
| Lloyd a Fry Foundation | | Chicago, IL | Local | 2 | 2018 | $2,000 |
| The Bob and Carol Passaneau Foundation C/O Carol P Passaneau | | | — | 1 | 2018 | $500 |