· Private foundation
Mostyn 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 you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2017–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k30 grants · $75k
- $10k–50k14 grants · $236k
- $50k–250k1 grant · $85k
| Recipient | Amount |
|---|---|
| WILD OCEANS INC | $85,000 |
| FREE ARTS OF NYC | $46,000 |
| INT'L GAMEFISH ASSOCIATION | $30,000 |
| GUY HARVEY FOUNDATION | $28,000 |
| DIABETES RESEARCH INSTITUTE | $25,000 |
| BONEFISH & TARPON TRUST | $17,000 |
| ALLIANCE FOR SAFETY & JUSTICE | $10,000 |
| EARTH ALLIES RESTORATION NETWORK | $10,000 |
| RURAL ADVANCEMENT FOUNDATION INT'L | $10,000 |
| LUCY BURNS INSTITUTE | $10,000 |
| COMMITTEE TO PROJECT JOURNALISTS | $10,000 |
| PRO PUBLICA | $10,000 |
| NAT'L ASSOC OF CHILDREN ADDICTIONS | $10,000 |
| MIAMI PROJECT TO CURE PARALYSIS | $10,000 |
| BERMUDA INSTITUTE OF OCEAN | $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 (FY17–25, $93k) land where the poverty rate runs at 10%, against an area that typically sits at 10%. 32% 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.
37 repeat relationships — 21 still active in FY2025, 16 since wound down; 23 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, 85% of grant dollars renewed an existing relationship; $58k 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
- IGINTERNATIONAL GAME FISH ASSOCIATION INC9× · 2017–2025 · $271k · revenue +48%
- DRDIABETES RESEARCH INSTITUTE FOUNDATION INC9× · 2017–2025 · $168k · revenue +32%
RURAL ADVANCEMENT FOUNDATION INTERNATION7× · 2018–2025 · $70k · revenue +169%
Funded once
- WOWild Oceans Inc Wild Oceans Incone grant, 2019 · $61k
- FAFree Arts of NYC Free Arts of NYCone grant, 2019 · $40k
- TRTEAM RUBICON INCone grant, 2019 · $25k · revenue -7%
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.
To establish and promote programs to protect the global climate, forests, wildlife and the natural environment, through research, advocacy, and investigation.
Improving the transparency and scientific integrity of climate solutions through open data and tools.
U.s. digital response is a nonprofit, nonpartisan organization that helps governments, nonprofits, and public entities respond quickly to critical public needs. the organization serves the public by leveraging a network of pro bono…
To drive transformational adaptation to protect communities across the country from higher seas, stronger storms, and more frequent flooding.
Common future is a network of pioneering leaders across the u.s. and canada who work deeply within their communities to create alternative approaches to business, philanthropy, and investing. we envision an economy that has transitioned…
Actionaid is an international network building a just, equitable, and sustainable world in solidarity with communities on the frontlines of poverty and injustice. actionaid usa is the u.s. branch of actionaid international, which works in…
The union of concerned scientists puts rigorous, independent science into action, developing solutions and advocating for a healthy, safe, and just future.
The open markets institute works to help people relearn how to use competition policy to build stronger democracies, more just and equitable societies, more innovative and sustainable economies, and a more secure and peaceful world.
Accelerate the transformation to a healthy, sustainable and equitable food system.
We Dont Waste increases food access and protects the planet by rescuing and repurposing food, while educating and advocating to increase food security and decrease food waste.
Common impact's mission is to strengthen the capacity of social change organizations, enabling them to better run and scale their programs. through its partnership with companies, common impact taps into the business skills and expertise…
To launch breakthrough climate mitigation efforts by identifying, supporting, and unleashing innovative leaders with transformative strategies.
For reference, the grantee most central to the portfolio’s shape is Local Initiatives Support Corporation and the most unlike its peers is Task Force Butler Institute. 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 22 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) — 4% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 3% 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.
97 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. 97 of the 172 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 WILD OCEANS INC ↗
- Who funds INTERNATIONAL GAME FISH ASSOCIATION INC ↗
- Who funds DIABETES RESEARCH INSTITUTE FOUNDATION INC ↗
- Who funds HEARTSTRONG HORSEMANSHIP INC ↗
- Who funds BONEFISH & TARPON TRUST INC ↗
- Who funds RURAL ADVANCEMENT FOUNDATION INTERNATION ↗
- Who funds LUCY BURNS INSTITUTE INC ↗
- Who funds Islesboro Affordable Property ↗
- Who funds Food On The Stove Inc ↗
- Who funds THE GROUNDTRUTH PROJECT INC ↗
- Who funds ALLIANCE FOR SAFETY AND JUSTICE ↗
- Who funds GUY HARVEY OCEAN FUND INC ↗
- Who funds TEAM RUBICON INC ↗
- Who funds RAZOM INC ↗
- Who funds LELEKA FOUNDATION ↗
- Who funds NOVA UKRAINE ↗
- Who funds PRO PUBLICA INC ↗
- Who funds GIBSON CENTER FOR SENIOR SERVICES INC ↗
- Who funds CENTER FOR DEMOCRACY AND TECHNOLOGY ↗
- Who funds NORTH CONWAY COMMUNITY CENTER ↗
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: Greater Washington Community Foundation · The Morris and Gwendolyn Cafritz Foundation · The New York Community Trust · Clark Charitable Foundation Inc Dba a James & Alice B Clark Foundation · Eugene & Agnes E Meyer Foundation · Tides Foundation · Silicon Valley Community Foundation · John S and James L Knight Foundation · Rockefeller Philanthropy Advisors Inc · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · New Venture Fund · Globalgiving Foundation 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 Mostyn Foundation Inc 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.
- International Game Fish Association Inc — 2% of income from government
- Guy Harvey Ocean Fund Inc — 0% 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 Mostyn Foundation Inc?
Find your warmest path to Mostyn 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.