| 1 | Peter and Carmen Lucia Buck Foundation INC Mystic | $3.4B | $0 | $2.8B |
| 2 | Dalio Foundation INC Westport | $1.0B | $0 | $1.7B |
| 3 | Hartford Foundation for Public Giving Hartford | $842.9M | $144.4M | $1.2B |
| 4 | Zoom Foundation Greenwich | $477.6M | $0 | $1.3B |
| 5 | Community Foundation for Greater New Haven New Haven | $287.5M | $55.7M | $627.4M |
| 6 | Knobloch Family Foundation Fairfield | $224.3M | $0 | $163.2M |
| 7 | Steven & Alexandra Cohen Foundation INC Stamford | $142.2M | $0 | $537.2M |
| 8 | Knights of Columbus Charitable Fund INC New Haven | $131.5M | $85.5M | $127.1M |
| 9 | Charityvest INC Fairfield | $130.7M | $113.4M | $103.4M |
| 10 | The Tow Foundation INC New Canaan | $117.5M | $0 | $311.4M |
| 11 | Berkley Foundation for Historical Books and Documents Greenwich | $100.0M | $0 | $100.0M |
| 12 | Seedlings Foundation Branford | $96.6M | $0 | $215.4M |
| 13 | Fairfield Countys Community Foundation INC Norwalk | $95.6M | $20.3M | $282.0M |
| 14 | Low Road Foundation Sharon | $87.8M | $0 | $217.1M |
| 15 | Community Foundation of Eastern Connecticut New London | $72.6M | $13.1M | $127.4M |
| 16 | John and Mary Pappajohn Family Foundation Stamford | $72.2M | $0 | $71.3M |
| 17 | Connecticut Health Foundation INC Hartford | $71.1M | $0 | $122.5M |
| 18 | National Charitable Endowment INC Darien | $69.3M | $55.2M | $175.9M |
| 19 | The Grossman Family Foundation Cos Cob | $61.8M | $0 | $142.5M |
| 20 | Melville Charitable Trust INC New Haven | $59.5M | $0 | $130.7M |
| 21 | Cohen Veterans Network INC Stamford | $55.9M | $0 | $28.5M |
| 22 | 1772 Foundation INC Pomfret Ctr | $54.6M | $0 | $81.1M |
| 23 | The Risc Foundation INC New Haven | $54.2M | $0 | $279.4M |
| 24 | Jane and Daniel Och Family Foundation Greenwich | $45.5M | $0 | $570.1M |
| 25 | Bursky Family Foundation Greenwich | $42.8M | $0 | $25.3M |
| 26 | Greater Hartford Community Foundation INC Hartford | $40.9M | $40.7M | $11.9M |
| 27 | Synchrony Foundation Stamford | $37.4M | $0 | $72.3M |
| 28 | Manresa Island Corp. Norwalk | $36.3M | $0 | $34.6M |
| 29 | Connecticut Community Foundation INC Waterbury | $35.6M | $26.1M | $175.5M |
| 30 | Winderful Foundation INC Riverside | $35.1M | $0 | $22.2M |
| 31 | United Way of Connecticut Rocky Hill | $34.5M | $34.5M | $20.7M |
| 32 | Michael and Carol Lowenstein Foundation INC Greenwich | $34.1M | $0 | $73.8M |
| 33 | New Canaan Community Foundation INC New Canaan | $33.8M | $9.8M | $32.0M |
| 34 | Floren Family Foundation Greenwich | $32.5M | $0 | $2.5M |
| 35 | S & L Marx Foundation INC Greenwich | $32.3M | $0 | $83.1M |
| 36 | Pitch Foundation Riverside | $28.1M | $0 | $111.9M |
| 37 | Deloitte Foundation Stamford | $28.0M | $28.0M | $51.4M |
| 38 | Brothers Brook Foundation Stamford | $27.5M | $0 | $90.9M |
| 39 | Jewish Community Foundation of Greater Hartford INC West Hartford | $27.1M | $14.2M | $172.5M |
| 40 | Nfa Foundation INC Norwich | $26.9M | $5.5M | $85.8M |
| 41 | Lyford Cay Foundation INC Greenwich | $25.7M | $7.0M | $39.6M |
| 42 | Jean and David W Wallace Foundation INC New Canaan | $24.7M | $0 | $36.6M |
| 43 | Karin Bain and John Kukral Foundation Old Greenwich | $24.0M | $0 | $88.1M |
| 44 | American Savings Foundation INC New Britain | $23.7M | $0 | $98.1M |
| 45 | Foundations in Education INC Shelton | $22.7M | $17.4M | $59.8M |
| 46 | Jeffrey P Ossen Family Foundation West Hartford | $21.6M | $0 | $18.0M |
| 47 | Halvorsen Family Foundation Stamford | $21.5M | $0 | $322.0M |
| 48 | The Zac Foundation for Childrens Safety Fairfield | $20.5M | $0 | $20.6M |
| 49 | Worldquant Foundation Old Greenwich | $20.3M | $0 | $22.3M |
| 50 | Lone Pine Foundation INC Greenwich | $20.2M | $0 | $58.6M |