| Horace Bushnell Memorial Hall CorporationHartford | Form 990 | $36,892,748FY2025 |
| Connecticut Public Broadcasting IncHartford | Form 990 | $26,072,352FY2025 |
| Mystic Seaport Museum IncMystic | Form 990 | $25,343,759FY2024 |
| The Maritime Aquarium at Norwalk IncSouth Norwalk | Form 990 | $20,483,968FY2025 |
| National Coast Guard Museum Association IncNew London | Form 990 | $19,498,324FY2024 |
| American Radio Relay League IncNewington | Form 990 | $17,176,974FY2025 |
| Goodspeed Opera House Foundation IncEast Haddam | Form 990 | $14,131,878FY2024 |
| Hartford Stage CompanyHartford | Form 990 | $13,554,571FY2025 |
| Connecticut Science Center IncHartford | Form 990 | $12,741,837FY2025 |
| Connecticut Association for the Performing ArtsNew Haven | Form 990 | $10,640,652FY2025 |
| Wadsworth Atheneum Museum of ArtHartford | Form 990 | $10,554,764FY2025 |
| Lockwood-Mathews Mansion Museum of Norwalk IncNorwalk | Form 990 | $9,788,543FY2024 |
| Stepping Stones Museum for Children IncNorwalk | Form 990 | $9,055,331FY2025 |
| Ridgefield Playhouse for Movies and the Performing Arts IncRidgefield | Form 990 | $9,046,466FY2025 |
| Stamford Museum and Nature Center IncorporatedStamford | Form 990 | $8,139,707FY2025 |
| Bruce Museum IncGreenwich | Form 990 | $7,770,928FY2025 |
| New Haven Center for Performing Arts IncWaterbury | Form 990 | $7,004,377FY2024 |
| Avon Theatre Film Center IncStamford | Form 990 | $6,749,136FY2025 |
| Connecticut Historical SocietyHartford | Form 990 | $6,635,191FY2025 |
| Hartford Symphony Orchestra IncHartford | Form 990 | $6,482,017FY2025 |
| Stamford Center for the Arts IncStamford | Form 990 | $6,073,160FY2025 |
| Neighborhood Music School IncNew Haven | Form 990 | $5,743,653FY2025 |
| Palace Theater Group IncWaterbury | Form 990 | $5,708,031FY2025 |
| New Britain Museum of American Art IncNew Britain | Form 990 | $5,651,195FY2025 |
| The Aldrich Contemporary Art Museum IncRidgefield | Form 990 | $5,539,362FY2024 |
| Alden Charitable Foundation IncGuilford | Form 990 | $5,104,229FY2025 |
| Garde Arts Center IncNew London | Form 990 | $5,062,502FY2025 |
| Westport Country Playhouse IncWestport | Form 990 | $5,052,629FY2024 |
| The Katharine Hepburn Cultural Arts Center IncOld Saybrook | Form 990 | $4,736,259FY2025 |
| The Mark Twain MemorialHartford | Form 990 | $4,010,233FY2025 |
| Connecticut News Project IncHartford | Form 990 | $3,952,178FY2024 |
| Northwest Connecticut Association for the Arts IncTorrington | Form 990 | $3,939,425FY2025 |
| Bucks Rock Camp IncNew Milford | Form 990 | $3,852,138FY2025 |
| Connecticut Players Foundation IncNew Haven | Form 990 | $3,851,603FY2025 |
| Eugene Oneill Memorial Theater Center IncWaterford | Form 990 | $3,848,837FY2025 |
| Greenwich Historical Society IncCos Cob | Form 990 | $3,744,249FY2025 |
| Connecticut Humanities CouncilMiddletown | Form 990 | $3,725,810FY2025 |
| Mattatuck Historical SocietyWaterbury | Form 990 | $3,546,294FY2025 |
| Connecticut Public Affairs Network IncHartford | Form 990 | $3,532,000FY2025 |
| Act of Connecticut IncRidgefield | Form 990 | $3,472,951FY2025 |
| Jewish Education in Media Inc Dba JBS Jewish Broadcasting ServicStamford | Form 990 | $3,471,962FY2025 |
| Harriet U Allyn Test TRNew London | Form 990 | $3,469,236FY2025 |
| Connecticut Trust for Historic PreservationHamden | Form 990 | $3,440,508FY2025 |
| Fairfield Theatre Company IncFairfield | Form 990 | $3,393,049FY2025 |
| Florence Griswold Museum IncOld Lyme | Form 990 | $3,316,214FY2024 |
| Barnum Museum Foundation IncBridgeport | Form 990 | $3,303,097FY2024 |
| Salisbury Association IncSalisbury | Form 990 | $3,279,279FY2025 |
| Ball & Socket Arts IncCheshire | Form 990 | $3,172,794FY2025 |
| New Haven International Festival of Arts & Ideas IncNew Haven | Form 990 | $3,148,982FY2025 |
| Connecticut Aeronautical Historical AssociationWindsor Locks | Form 990 | $3,041,498FY2025 |