| 1 | Peter and Carmen Lucia Buck Foundation INC | Philanthropy, Voluntarism & Grantmaking | $3.4B | $2.8B |
| 2 | Sea Research Foundation INC | Animal-Related | $58.6M | $58.5M |
| 3 | Mystic Seaport Museum INC | Arts, Culture & Humanities | $55.0M | $114.4M |
| 4 | Retro Report INC | Arts, Culture & Humanities | $7.8M | $454K |
| 5 | The Global Foundation for Ocean Exploration INC | Science & Technology | $4.6M | $1.8M |
| 6 | Denison Pequotsepos Nature Center INC | Environment | $1.6M | $10.7M |
| 7 | Conneticut Maritime Foundation INC | Environment | $1.6M | $331K |
| 8 | Mystic & Noank Library INC | Education | $1.6M | $11.5M |
| 9 | Mystic River Ambulance Association INC | Health Care | $1.5M | $857K |
| 10 | Mystic Museum of Art INC | Arts, Culture & Humanities | $1.3M | $5.5M |
| 11 | Always Home INC | Housing & Shelter | $1.1M | $1.7M |
| 12 | Reforest the Tropics INC | Environment | $965K | $1.5M |
| 13 | Mystic Chamber of Commerce INC | Unclassified | $727K | $266K |
| 14 | Masons Island Yacht Club INC | Unclassified | $609K | $1.3M |
| 15 | Connecticut Beer Wholesalers Association INC | Unclassified | $335K | $63K |
| 16 | College Autism Network | Human Services | $319K | $238K |
| 17 | Stoneridge Residents Association | Human Services | $219K | $99K |
| 18 | Denison Society INC | Unclassified | $210K | $2.3M |
| 19 | New England Collegiate Baseball League INC | Unclassified | $171K | $5K |
| 20 | Artemis Foundation INC | Philanthropy, Voluntarism & Grantmaking | $160K | $1.1M |
| 21 | Alliance for the Mystic River Watershed INC | Environment | $138K | $108K |
| 22 | The@douglas S and Barbara J Barrett Family Foundation | Philanthropy, Voluntarism & Grantmaking | $136K | $734K |
| 23 | Sails Up 4 Cancer INC | Medical Research | $134K | $92K |
| 24 | Mystic Rod & Gun Club Incorporated | Unclassified | $130K | $427K |
| 25 | Mystic Irish Parade Foundation | Philanthropy, Voluntarism & Grantmaking | $123K | $101K |
| 26 | Tomkat Foundation | Philanthropy, Voluntarism & Grantmaking | $117K | $878K |
| 27 | Practice Foundation INC | Unclassified | $98K | $248K |
| 28 | Fitch--east Lyme-ledyard Hockey Cl Ub INC | Recreation & Sports | $89K | $65K |
| 29 | Stonington Odd Fellows Corporation | Civil Rights, Social Action & Advocacy | $84K | $1.4M |
| 30 | Connecticut Tooling and Machining Association INC | Unclassified | $83K | $88K |
| 31 | Coach Vic Foundation INC | Philanthropy, Voluntarism & Grantmaking | $56K | $1K |
| 32 | Rotary Club of Mystic Charitable Fund INC | Education | $53K | $39K |
| 33 | Emerson Theater Collaborative INC | Arts, Culture & Humanities | $49K | $12K |
| 34 | Baldwin Yacht Club | Unclassified | $41K | $39K |
| 35 | Center for American Marine Art | Arts, Culture & Humanities | $33K | $85K |
| 36 | Mary L Jobe Akeley Trust & Peace Sanctuary | Unclassified | $31K | $418K |
| 37 | Ann M and Sultan Ahamed Foundation | Philanthropy, Voluntarism & Grantmaking | $28K | $240K |
| 38 | The Katherine Forest Crafts Foundation INC | Unclassified | $25K | $263K |
| 39 | Rotary International | Unclassified | $18K | $8K |
| 40 | Holstein Foundation | Unclassified | $15K | $359K |
| 41 | Bluebird Foundation INC | Philanthropy, Voluntarism & Grantmaking | $7K | $39K |
| 42 | Mystic Geriatrics Institute INC | Human Services | $5K | $11K |
| 43 | L Y Spear Foundation | Unclassified | $2K | $36K |
| 44 | Eugene Oneill Society | Unclassified | $0 | $0 |
| 45 | Lower Mystic Cemetery Association | Unclassified | $0 | $0 |
| 46 | Westerly Troops Boy Scouts of America INC | Youth Development | $0 | $0 |
| 47 | St. Patricks Church Corp. | Unclassified | $0 | $0 |
| 48 | Hugo a Simonelli Post 3263 Veterans of Foreign Wars of the United Stat | Public & Societal Benefit | $0 | $0 |
| 49 | St. Marks Episcopal Church | Unclassified | $0 | $0 |
| 50 | Eastern Connecticut Emergency Medical Services Council INC | Health Care | $0 | $0 |
| 51 | Estate and Tax Planning Council of Eastern Connecticut INC | Unclassified | $0 | $0 |
| 52 | Connecticut Songwriters Association INC | Unclassified | $0 | $0 |
| 53 | Brookside INC | Unclassified | $0 | $0 |
| 54 | Fish Cemetery Association | Mutual & Membership Benefit | $0 | $0 |
| 55 | Mystic Flag Committee | Unclassified | $0 | $0 |
| 56 | Seaport Heights Homeowners Association INC | Community Improvement & Capacity Building | $0 | $0 |
| 57 | Northeast Academy PTO | Unclassified | $0 | $0 |
| 58 | Federated Garden Clubs of Connecticut INC | Unclassified | $0 | $0 |
| 59 | Mystic River Chorale | Unclassified | $0 | $0 |
| 60 | Technology for Connecticut INC | Science & Technology | $0 | $0 |
| 61 | Burnetts Corners Preservation Society INC | Arts, Culture & Humanities | $0 | $0 |
| 62 | Groton-new London International Church of Christ | Religion-Related | $0 | $0 |
| 63 | Ocean Technology Foundation INC | Science & Technology | $0 | $0 |
| 64 | Local United Network to Combat Hunger | Human Services | $0 | $0 |
| 65 | Abundant Grace Church | Religion-Related | $0 | $0 |
| 66 | National Society of the Daughters of the American Revolution | Unclassified | $0 | $0 |
| 67 | Union Baptist Church | Unclassified | $0 | $0 |
| 68 | Mystic Congregational Church INC | Unclassified | $0 | $0 |
| 69 | Independent Order of Odd Fellows | Unclassified | $0 | $0 |
| 70 | International Association of Lions Clubs | Unclassified | $0 | $0 |
| 71 | Mystic Hook & Ladder Co INC | Unclassified | $0 | $0 |
| 72 | Sandal Clay Stuart Fund to Promote Mental Health Research | Philanthropy, Voluntarism & Grantmaking | $0 | $0 |
| 73 | Noank Rowling Club INC | Recreation & Sports | $0 | $0 |
| 74 | Mysticalligraphers INC | Unclassified | $0 | $0 |
| 75 | Nautilus Alumni Association INC | Public & Societal Benefit | $0 | $0 |
| 76 | Mohegan Striders Assoc | Unclassified | $0 | $0 |
| 77 | Mystic River Historical Society INC | Arts, Culture & Humanities | $0 | $0 |
| 78 | Daughters of Isabella | Unclassified | $0 | $0 |
| 79 | Knights of Columbus | Unclassified | $0 | $0 |
| 80 | Mystic Womans Club INC | Philanthropy, Voluntarism & Grantmaking | $0 | $0 |
| 81 | Mystic Community Bikes | Recreation & Sports | $0 | $0 |
| 82 | A Good Laugh INC | Philanthropy, Voluntarism & Grantmaking | $0 | $0 |
| 83 | Groton Lacrosse | Youth Development | $0 | $0 |
| 84 | Association of Notre Dame Clubs INC | Unclassified | $0 | $0 |
| 85 | Assisi Foundation INC | Philanthropy, Voluntarism & Grantmaking | $0 | $0 |
| 86 | VFW Auxiliary Department of Connecticut INC | Public & Societal Benefit | $0 | $0 |
| 87 | The Redeemed Christian Church of God Sanctuary of Praise | Religion-Related | $0 | $0 |
| 88 | Gold Star Home INC | Human Services | $0 | $0 |
| 89 | Coastal Environmental Services INC | Environment | $0 | $0 |
| 90 | St. Edmund of Connecticut INC | Unclassified | $0 | $0 |
| 91 | Bike Stonington | Recreation & Sports | $0 | $0 |
| 92 | American Schooner Association INC | Recreation & Sports | $0 | $0 |
| 93 | Casire Foundation Corporation | Education | $0 | $0 |
| 94 | Ct Clippers | Recreation & Sports | $0 | $0 |
| 95 | St. Edmunds Retreat INC | Unclassified | $0 | $0 |
| 96 | Mystic Lions Community Foundation INC | Philanthropy, Voluntarism & Grantmaking | $0 | $0 |
| 97 | Groton Community Meals INC | Food, Agriculture & Nutrition | $0 | $0 |
| 98 | Friends of the Mystic & Noank Library INC | Education | $0 | $0 |
| 99 | Prevent-heal-thrive INC | Human Services | $0 | $0 |
| 100 | Unityct INC | Religion-Related | $0 | $0 |