Organizations
Largest first
By revenue on the last return. Organizations that file Form 990-N report no figures and come last.
| Organization | Return | Revenue |
|---|---|---|
| Slipstream Group IncMadison | Form 990 | $41,062,264FY2024 |
| Revolvs Salvage IncWaupaca | Form 990 | $25,224,212FY2025 |
| Whitetails Unlimited IncSturgeon Bay | Form 990 | $14,337,122FY2025 |
| Urban Ecology Center IncMilwaukee | Form 990 | $8,370,353FY2025 |
| Northwoods Land Trust IncEagle River | Form 990 | $6,039,861FY2025 |
| Door County Land Trust IncSturgeon Bay | Form 990 | $5,713,741FY2024 |
| Restoring Lands IncWest Bend | Form 990 | $5,086,460FY2025 |
| Driftless Area Land Conservancy IncDodgeville | Form 990 | $5,075,153FY2025 |
| Clean Wisconsin IncMadison | Form 990 | $5,017,740FY2025 |
| Friends of Schlitz-Audubon Center IncMilwaukee | Form 990 | $4,631,339FY2025 |
| Green Bay Botanical Garden IncGreen Bay | Form 990 | $4,280,140FY2025 |
| Kuse Farm Museum and Nature Preserve IncMedford | Form 990 | $3,983,763FY2025 |
| Aldo Leopold Nature Center IncMonona | Form 990 | $3,817,323FY2024 |
| Mississippi Valley Conservancy IncLa Crosse | Form 990 | $3,712,124FY2025 |
| Olbrich Botanical Society IncMadison | Form 990 | $3,667,076FY2024 |
| Savanna InstituteMadison | Form 990 | $3,633,316FY2024 |
| Robert W Monk Gardens IncWausau | Form 990 | $3,484,438FY2024 |
| Coalition for Sustainable InitiativesWhitefish Bay | Form 990 | $2,965,419FY2024 |
| Taliesin Preservation IncSpring Green | Form 990 | $2,950,672FY2024 |
| Wisconsin Conservation Voices IncMadison | Form 990 | $2,860,614FY2024 |
| Riveredge Nature Center IncNewburg | Form 990 | $2,730,284FY2025 |
| Landmark Conservancy IncMenomonie | Form 990 | $2,611,663FY2025 |
| Central Conservation IncLa Crosse | Form 990 | $2,492,740FY2024 |
| Cedar Lakes Conservation Foundation IncWest Bend | Form 990 | $2,423,665FY2025 |
| Groundswell Conservancy IncMadison | Form 990 | $2,117,033FY2025 |
| Cleantech Partners IncMadison | Form 990 | $2,094,209FY2024 |
| Geneva Lake Conservancy IncFontana | Form 990 | $1,999,304FY2025 |
| Glacierland Resource Conservation & DevelopmentGreen Bay | Form 990 | $1,971,537FY2024 |
| Wild Rivers Conservancy of the St Croix & NamekagonOsceola | Form 990 | $1,971,043FY2025 |
| Tall Pines Conservancy IncNashotah | Form 990 | $1,935,128FY2024 |
| Green Lake Association IncGreen Lake | Form 990 | $1,896,514FY2025 |
| Institute for the Study of Energy and Our FutureEllsworth | Form 990 | $1,860,945FY2024 |
| Gathering Waters IncMadison | Form 990 | $1,775,856FY2025 |
| Midwest Renewable Energy Association IncCuster | Form 990 | $1,698,751FY2025 |
| Milwaukee Parks FoundationMilwaukee | Form 990 | $1,632,617FY2025 |
| Southern Wisconsin Bird Alliance IncMadison | Form 990 | $1,616,784FY2025 |
| Golden Sands Resource Conservation and Development CouncilStevens Point | Form 990 | $1,524,987FY2024 |
| Woodland Dunes Nature Center and Preserve IncTwo Rivers | Form 990 | $1,521,994FY2025 |
| Milwaukee Water Commons IncMilwaukee | Form 990 | $1,508,793FY2024 |
| Fund for Lake Michigan IncMilwaukee | Form 990 | $1,425,000FY2025 |
| Wisconsin Land and Water Conservation Association IncMadison | Form 990 | $1,402,250FY2024 |
| Rotary Botanical Gardens IncJanesville | Form 990 | $1,382,423FY2025 |
| REFLOMilwaukee | Form 990 | $1,372,710FY2024 |
| Renew Wisconsin IncMadison | Form 990 | $1,367,679FY2025 |
| Trees for Tomorrow IncEagle River | Form 990 | $1,284,321FY2025 |
| Lumberjack Resource Conservation and Development CouncilRhinelander | Form 990 | $1,266,062FY2024 |
| Wild Ones -- Natural Landscapers LtdNeenah | Form 990 | $1,233,429FY2024 |
| Harbor District IncMilwaukee | Form 990 | $1,136,449FY2025 |
| Riverview Gardens IncAppleton | Form 990 | $1,133,558FY2025 |
| Heckrodt Wetland Reserve IncMenasha | Form 990 | $1,108,226FY2024 |
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