| Rooted WI IncMadison | Form 990 | $1,047,057FY2024 |
| Friends of Pheasant Branch Conservancy IncMiddleton | Form 990 | $1,026,016FY2024 |
| Milwaukee RiverkeeperMilwaukee | Form 990 | $974,877FY2025 |
| Sustain Dane IncMadison | Form 990 | $945,786FY2024 |
| Clean Lakes Alliance IncMadison | Form 990 | $938,969FY2024 |
| Wisconsin Waterfowl Association IncWales | Form 990 | $933,875FY2024 |
| Friends of Lapham Peak UnitDelafield | Form 990 | $928,817FY2025 |
| Wpga Perc IncPoynette | Form 990 | $902,326FY2024 |
| Mequon Nature Preserve IncMequon | Form 990 | $888,997FY2024 |
| Beloit Convention & Visitors Bureau Charitable Foundation IncBeloit | Form 990 | $881,019FY2025 |
| Midwest Bikeshare IncMilwaukee | Form 990 | $870,629FY2024 |
| Future Neenah IncNeenah | Form 990 | $865,508FY2025 |
| Wisconsin Wetlands Association IncMadison | Form 990 | $856,095FY2025 |
| Linda and Gene Farley Center for Peace Justice and Sustainability IVerona | Form 990 | $783,873FY2024 |
| Applied Ecological Institute IncBrodhead | Form 990 | $745,761FY2025 |
| North American Lake Management SocietyMadison | Form 990 | $675,527FY2024 |
| Friends of Wehr Nature Center IncFranklin | Form 990 | $674,833FY2024 |
| Wings Over Wisconsin IncMayville | Form 990 | $657,986FY2025 |
| Yahara Pride Farms IncWaunakee | Form 990 | $623,542FY2024 |
| Northeast Wisconsin Land Trust IncAppleton | Form 990 | $618,953FY2024 |
| Norskedalen Nature and Heritage Center IncCoon Valley | Form 990 | $579,169FY2025 |
| Wisconsins Green Fire IncorporatedMadison | Form 990 | $578,281FY2024 |
| Groundwork Milwaukee IncMilwaukee | Form 990 | $570,865FY2024 |
| Mandaamin Institute IncElkhorn | Form 990 | $559,933FY2024 |
| Friends of Reedsburg ParksReedsburg | Form 990 | $554,150FY2025 |
| Navarino Nature Center IncShiocton | Form 990 | $533,879FY2024 |
| 1000 Friends of Wisconsin IncStevens Point | Form 990 | $533,442FY2024 |
| Root-Pike Watershed Initiative Network IncKenosha | Form 990 | $517,955FY2025 |
| Eco Justice Center IncCaledonia | Form 990 | $517,042FY2025 |
| Wisconsin Tribal Conservation Advisory Council IncOconto Falls | Form 990 | $513,506FY2024 |
| Bradley-Sigma Phi Historical Landmark Preservation Fund IncMadison | Form 990 | $513,002FY2024 |
| Sustainable Business Council CorpEagle | Form 990 | $511,345FY2025 |
| Healthy Climate WisconsinMadison | Form 990 | $510,353FY2025 |
| Glacial Lakes Conservancy IncSheboygan | Form 990 | $507,884FY2025 |
| Crossroads at Big Creek IncSturgeon Bay | Form 990 | $502,124FY2024 |
| Southeastern Wisconsin Watersheds Trust IncMilwaukee | Form 990 | $498,776FY2024 |
| Northwoods Wildlife Hospital and Rehabilitation Center IncMinocqua | Form 990 | $485,641FY2025 |
| Forest Home Historic Preservation Association IncMilwaukee | Form 990 | $483,947FY2024 |
| Friends of Devils Lake State ParkBaraboo | Form 990 | $479,447FY2025 |
| River Alliance of Wisconsin IncMadison | Form 990 | $477,469FY2025 |
| Mississippi River Parkway CommissionMadison | Form 990 | $475,322FY2024 |
| Philadelphia Community Farm IncOsceola | Form 990 | $466,665FY2025 |
| Southern Wisconsin Land Conservancy IncBrodhead | Form 990 | $464,666FY2024 |
| North Central Conservancy Trust IncStevens Point | Form 990 | $461,357FY2025 |
| River Bend Nature Center IncCaledonia | Form 990 | $446,122FY2024 |
| Kinnickinnic River Land Trust IncRiver Falls | Form 990 | $445,399FY2024 |
| Wisconsin Wastewater Operators AssociationWales | Form 990 | $439,362FY2025 |
| Ursa Collective IncorporatedMadison | Form 990 | $414,739FY2025 |
| 350 Wisconsin IncMadison | Form 990 | $410,413FY2025 |
| Friends of Willow River and Kinnickinnic State Parks IncHudson | Form 990 | $409,022FY2024 |