· Private foundation
Mariel Foundation
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 you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2021–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k12 grants · $49k
- $10k–50k9 grants · $174k
- $50k–250k6 grants · $478k
| Recipient | Amount |
|---|---|
| Water 1st | $135,000 |
| Trout Unlimited | $100,000 |
| Leelanau Conservancy | $73,550 |
| Mote Marine Laboratory Aquar | $66,000 |
| Inland Seas Education Assoc | $53,500 |
| Interlochen Center for the Arts | $50,000 |
| Afraid of Bear-American Horse Tiosp | $35,000 |
| Groundwork Ctr for Resilient Comm | $30,750 |
| 20Fathoms | $22,500 |
| Individual grant recipient | $19,000 |
| Women's Reproductive Rights Assista | $18,985 |
| Partners for World Health | $14,985 |
| Individual grant recipient | $12,500 |
| Ripa Ladrang Foundation | $10,000 |
| REACH Studio Art Ctr | $10,000 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Your human-services grants (FY21–24, $35k) land where the poverty rate runs at 7%, against an area that typically sits at 8%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
Which US states your grants reach
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
31 repeat relationships — 19 still active in FY2025, 12 since wound down; 7 grantees were first funded in FY2025 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Still filing today
New vs renewed · share of each year
In FY2025, 87% of grant dollars renewed an existing relationship; $87k went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). The earliest year is left-censored: relationships that predate the data read as “new.” Theme is the grantee’s IRS cause.
Backed again, and grew
- TUTROUT UNLIMITED INC3× · 2023–2025 · $250k · revenue +75%
- ISINLAND SEAS EDUCATION ASSOCIATION5× · 2021–2025 · $161k · revenue +95%
- SHSACRED HEALING CIRCLE3× · 2021–2023 · $125k · revenue +58% · 36% of their budget
Funded once
- GCGrouindwork Ctr for Resilient Commone grant, 2021 · $50k
- IGIndividual grant recipientone grant, 2021 · $20k
- MLMuskegon Lakeshore Chamber of Commone grant, 2021 · $5k
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
Our mission is conserving West Michigans ecologically critical land. We protect land by creating public nature preserves, providing support to communities and local governments in creating natural areas, and helping private landowners…
To conserve, sustain, and connect natural areas, land, and waters that make the places we live special
To permanently protect and improve natural environments in Mid-Michigan by leading and inspiring actions that conserve vital habitats and waterways for the benefit of our entire community.
Heart of the Lakes provides technical assistance, leadership training, and strategic communication tools that help organizations thrive - from grassroots land conservancies to larger regional conservation groups. Programs such as peer…
The minnesota land trust protects and restores minnesota's most vital natural lands in order to provide wildlife habitat, clean water, outdoor experiences and scenic beauty for generations to come.
Preserve in perpetuity the natural habitats, rural landscapes, and open spaces of the great peninsula of washington's puget sound.
The mission of Midcoast Conservancy is to protect vital lands and waters on a scale that matters and to inspire wonder and action on behalf of all species and the Earth.
The environmental law & policy center (elpc) is the midwest's leading public interest environmental legal advocacy and ecobusiness innovation organization, and among the nation's leaders. we develop and lead successful strategic…
Safeguard southern michigan's land and water to support diverse, resilient, and thriving communities - forever
The organization's mission is to conserve and promote new england's native plants to ensure healthy, biologically diverse landscapes.
To protect wisconsin's lands, waters, and wildlife by providing funding, leading partnerships, and connecting all people with nature.
The Center's mission is to inspire, entertain, educate, and serve all in Northern Michigan year-round by presenting exceptional experiences across the full spectrum of the performing arts and offering impactful educational opportunities.
For reference, the grantee most central to the portfolio’s shape is National Center for Family Philanthropy Inc and the most unlike its peers is Para La Naturaleza Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 34 years old; the field is 16. You back the established end — and your money leans older still.
The field is 22% startups (under 5 years old) — 0% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 13% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
31 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, not grant rows in a single year — so this will not match the grant count on the cover. 31 of the 45 grantees resolved in that span have returns of their own we could reconcile; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.
- Who funds WATER FIRST INTERNATIONAL ↗
- Who funds INTERLOCHEN CENTER FOR THE ARTS ↗
- Who funds LEELANAU CONSERVANCY ↗
- Who funds TROUT UNLIMITED INC ↗
- Who funds INLAND SEAS EDUCATION ASSOCIATION ↗
- Who funds LANSING ART GALLERY & EDUCATION CENTER ↗
- Who funds MICHIGAN CAMPAIGN FINANCE NETWORK ↗
- Who funds SACRED HEALING CIRCLE ↗
- Who funds ENVIRONMENTAL DEFENSE FUND INCORPORATED ↗
- Who funds SANIBEL-CAPTIVA CONSERVATION FOUNDATION ↗
- Who funds PARA LA NATURALEZA INC ↗
- Who funds TRAVERSE CITY CENTER OF ENTREPRENEURSHIP ↗
- Who funds KALAPA MEDIA INC ↗
- Who funds Reach Studio Art Center ↗
- Who funds Portland Parks Conservancy ↗
- Who funds The Discovery Center ↗
- Who funds GRAND TRAVERSE REGIONAL LAND CONSERVANCY ↗
- Who funds FULL PLATES FULL POTENTIAL ↗
- Who funds NORTHWESTERN MICHIGAN COLLEGE FOUNDATION ↗
- Who funds BOOK TRUST ↗
- Who funds RAINFOREST TRUST ↗
- Who funds CAPITAL REGION COMMUNITY FOUNDATION ↗
- Who funds WORLD WILDLIFE FUND INC ↗
- Who funds GLEN ARBOR ARTS CENTER ↗
- Who funds Partners for World Health ↗
- Who funds FOR LOVE OF WATER ↗
- Who funds Ripa Ladrang Foundation ↗
- Who funds GRAND TRAVERSE REGIONAL COMMUNITY FOUNDATION ↗
- Who funds MEDICAL DEBT RESOLUTION INC ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
Open a dossier: Grand Traverse Regional Community Foundation · Oleson Foundation · Rotary Charities of Traverse City · Dte Energy Foundation · Hp Foundation · Jim and Diana Huckle Family Foundation · The Art and Mary Schmuckal Family Foundation · Harry a and Margaret D Towsley Foundation · Vanguard Charitable Endowment Program · Paypal Charitable Giving Fund · Donor Advised Charitable Giving Inc · Morgan Stanley Global Impact Funding Trust Inc
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization Mariel Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal or a single department — and drag the year to watch it move.
- Sanibel-Captiva Conservation Foundation — 4% of income from government
Government income is each org’s traced federal awards (USASpending — grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that your grant caused the public funding. Coverage is precision-first — a floor, not a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12–24 months.
Warm introductions · Powered by PlinthPlus
How do I get to Mariel Foundation?
Find your warmest path to Mariel Foundation 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.