· Private foundation
The Louis Stewart Foundation Inc
Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.
What it funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.
Where the money goes
Grants by size, and the largest recipients.
By grant size · FY2025
- Under $10k7 grants · $12k
- $10k–50k2 grants · $40k
- $50k–250k2 grants · $201k
| Recipient | Amount |
|---|---|
| CHARITIES AID FOUNDATION AMERICAN DONOR FUND | $101,000 |
| RAINFOREST TRUST | $100,000 |
| SAVING NATURE | $30,000 |
| MAYO CLINIC | $10,000 |
| AMERICAN FRIENDS OF CANADIAN NATURE | $3,000 |
| PAMS FOUNDATION INC | $2,000 |
| HADLEY SCHOOL FOR THE BLIND | $2,000 |
| CABLE NATURAL HISTORY MUSEUM | $2,000 |
| NORTHSHORE HOSPITALS FOUNDATION | $1,000 |
| NORTH SHORE COUNTRY DAY SCHOOL | $1,000 |
| NORTHWESTERN UNIVERSITY FILM DEPARTMENT | $1,000 |
Does the money reach high-need areas?
Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.
US giving: 65% of grant dollars ($1.1M). The need read here covers only this US portion; the 35% that went abroad ($600k) is mapped below.
Dollar for dollar, its grants (FY17–25) land where the poverty rate runs at 10%, against an area that typically sits at 11%. 27% of its dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.
How this is measured
Which US states its grants reach
Beyond the US: 35% of all-years giving ($600k)
2 countries, by the recipient’s country on the filing.
How this is measured
Where the work is directed
The same grants placed two ways: where each recipient sits, and where its stated purpose sends the money.
About 9% of The Louis Stewart Foundation Inc’s grant dollars are earmarked for a different county than the recipient’s own address.
How this is measured
Who it funds again
Organizations funded in more than one year, against those funded once.
Grantees it renews have grown median revenue +46% since the first grant, against +31% for those funded once.
12 repeat relationships: 9 still active in FY2025, 3 since wound down; 2 grantees were first funded in FY2025 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2025, 98% of grant dollars renewed an existing relationship; $4k went to new ones.
Where new relationships form · theme of each grantee’s first grant
How this is measured
Backed again, and grew
- RTRAINFOREST TRUST8× · 2017–2025 · $563k · revenue +100%
- FFFAUNA & FLORA INTERNATIONAL USA INC6× · 2017–2024 · $209k · revenue +654%
- SNSAVING NATURE INC5× · 2021–2025 · $115k · revenue +462%
Funded once
- AFAMERICANS FOR OXFORD INCone grant, 2017 · $8k · revenue +17%
- TFTED FOUNDATION INCgraduatedone grant, 2021 · $5k · revenue +31%
- AMABACO MEDICAL RELIEF FUND INCone grant, 2020 · $5k
How this is measured
Repeat means funded in two or more distinct years. Growth and survival are read from each grantee’s own subsequent IRS filings.
Closest unfunded matches
The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.
Iucn-us fund builds bridges between us donors and iucn by catalyzing, accelerating, funding and promoting iucn's work - conserving nature and natural resources in the united states and throughout the world.
To protect and to promote the protection of the ecological integrity and other conservation values of the natural areas of canada through securement of fee title and less than fee interests in land and support of canadian conservation…
Ci works to spotlight and secure the critical benefits that nature provides to humanity.
Wwf's mission is to conserve nature and reduce the most pressing threats to the diversity of life on earth. (continued on schedule o)
Preservation and conservation of natural ecosystems and biodiversity worldwide.
Natura International conserves rainforests and other key natural ecosystems and the endangered species they contain through creation of protected areas in collaboration with local governments and communities in Latin America. In this way…
Preserving and enhancing the habitat of wildlife, such as sandhill cranes, waterfowl, raptors, which habitat expenses are supported by agricultural activities.
Blue investments for nature, inc. (bin) is a nonprofit corporation whose sole member and supported organization is the nature conservancy (tnc). tnc is a longstanding section 501(c)(3) public charity organized and operated for the…
The purpose of rainforest foundation us is to support indigenous peoples and forest communities in their efforts to secure their lands, protect their environment, and uphold their rights.
How this is measured
15 grantees tracked through their own filings, 2017–2025.
Each grant beside the grantee’s revenue from every source, year by year.
How this is measured
Counted here: distinct organizations funded across 2017 to 2025, not grant rows in a single year, so this will not match the grant count on the cover. 15 of the 23 grantees resolved in that span have returns of their own we could reconcile.
Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.
Where the money sits, by cause and then by grantee
Each grantee by its size and the funder’s share of it; top left is load-bearing
Grantee by grantee: a decade per organization, before and after funding
A decade per grantee: revenue shaded, grants as bars, all rows on one timeline.
- Who funds RAINFOREST TRUST ↗
- Who funds FAUNA & FLORA INTERNATIONAL USA INC ↗
- Who funds SAVING NATURE INC ↗
- Who funds CHARITIES AID FOUNDATION AMERICA ↗
- Who funds PAMS FOUNDATION INC ↗
- Who funds CABLE NATURAL HISTORY MUSEUM INC ↗
- Who funds HADLEY INSTITUTE FOR THE BLIND AND VISUALLY IMPAIRED ↗
- Who funds AMERICANS FOR OXFORD INC ↗
- Who funds NORTH SHORE COUNTRY DAY SCHOOL ↗
- Who funds CHAPEL & YORK US FOUNDATION INC ↗
- Who funds TED FOUNDATION INC ↗
- Who funds THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK ↗
- Who funds AMERICAN FRIENDS OF CANADIAN NATURE INC ↗
- Who funds Bahamas National Trust Fund Inc ↗
- Who funds Endeavor Health Clinical Operations ↗
Co-funders
Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.
Open a dossier: National Philanthropic Trust · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc · Vanguard Charitable Endowment Program · Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile Foundation
How this is measured
How much its grantees rely on government
Each dot is one organization The Louis Stewart Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from The Louis Stewart Foundation Inc. Bigger dots raise more.
How this is measured
Warm introductions · Powered by PlinthPlus
How do I get to The Louis Stewart Foundation Inc?
Find your warmest path to The Louis Stewart Foundation Inc through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.
Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.
Play a game based on Louis Stewart’s filings →