| Planetary Health IncChestnut Hill | Form 990-EZ | $55,587FY2025 |
| Arlington Land Trust IncArlington | Form 990 | $54,949FY2025 |
| Salisbury Beach Betterment Association IncSalisbury | Form 990-EZ | $53,160FY2024 |
| Global Coral Reef Alliance IncCambridge | Form 990-EZ | $52,708FY2025 |
| Westborough Community Land Trust IncWestborough | Form 990 | $52,298FY2024 |
| Cape Ann Trail Stewards IncEssex | Form 990-EZ | $51,236FY2025 |
| Beaver Lake Trust IncWare | Form 990-N | No figure |
| Northeast Outdoors Foundation IncEast Longmeadow | Form 990-EZ | $49,578FY2024 |
| Clinton Greenway Conservation Trust IncClinton | Form 990 | $49,213FY2025 |
| Gulf of Maine Institute IncWest Newbury | Form 990-N | No figure |
| Attleboro Land Trust IncAttleboro | Form 990-N | No figure |
| Friends of the Mary Ellen Welch Greenway IncBoston | Form 990-EZ | $48,106FY2025 |
| West Springfield Garden ClubWest Springfield | Form 990-N | No figure |
| Grafton Land Trust IncGrafton | Form 990 | $44,905FY2025 |
| Bio-Amazonia Conservation International IncWeymouth | Form 990-EZ | $44,457FY2023 |
| Foundation for a Green FutureBoston | Form 990-N | No figure |
| Brookline Greenspace Alliance IncBrookline Village | Form 990-N | No figure |
| Friends of Lake QuannapowittWakefield | Form 990-N | No figure |
| Garden Club Federation of Massachusetts IncDennis | Form 990-N | No figure |
| Athol Bird and Nature Club IncAthol | Form 990-N | No figure |
| Coastal Trails Coalition IncNewburyport | Form 990-N | No figure |
| Massachusetts Housing and Climate Innovation Center IncSouth Yarmouth | Form 990-N | No figure |
| Hopkinton Area Land TR IncWoodville | Form 990-N | No figure |
| Chelmsford Land Conservation Trust IncChelmsford | Form 990-N | No figure |
| Friends of David Mugar WayBoston | Form 990-N | No figure |
| Stockbridge Land Trust IncStockbridge | Form 990-N | No figure |
| Garden Club Federation of Massachusetts IncConcord | Form 990-N | No figure |
| Urban Beekeeping Laboratory and Bee Sanctuary IncBoston | Form 990-N | No figure |
| Oyster Pond Environmental TR IncWoods Hole | Form 990-N | No figure |
| Garden Club Federation of Massachusetts IncHull | Form 990-N | No figure |
| Egremont Land Trust IncSouth Egremont | Form 990-N | No figure |
| The Nuclear Decommissioning Collaborative IncArlington | Form 990-N | No figure |
| Andover Garden ClubAndover | Form 990-N | No figure |
| North Quabbin Trails Association IncOrange | Form 990-N | No figure |
| New England Equestrian Land MGMNT Conservation CorporationAthol | Form 990-N | No figure |
| Boxborough Conservation Trust IncBoxborough | Form 990-N | No figure |
| Marathon Daffodils IncCharlestown | Form 990-N | No figure |
| Worcester Garden Club IncWorcester | Form 990-N | No figure |
| Chatham Garden Club IncChatham | Form 990-N | No figure |
| Fenway Garden SocietyBoston | Form 990-N | No figure |
| Reading Open Land Trust IncReading | Form 990-N | No figure |
| Nature Preserve IncPembroke | Form 990-N | No figure |
| Pocasset Water Quality Coalition IncPocasset | Form 990-N | No figure |
| Popponesset Water Stewardship Alliance IncAbington | Form 990-N | No figure |
| Charlestown Sprouts IncCharlestown | Form 990-N | No figure |
| Sportsmens National Land Trust Massachusetts Chapter IncAgawam | Form 990-N | No figure |
| Friends of the Mashpee National Wildlife Refuge IncMashpee | Form 990-N | No figure |
| Garden Club Federation of Massachusetts IncFalmouth | Form 990-N | No figure |
| Lake Sargent Association IncLeicester | Form 990-N | No figure |
| Monterey Preservation Land Trust IncMonterey | Form 990-N | No figure |