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Mostyn Foundation Inc at a glance

· 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.

$396k
Granted FY2025still arriving
45
Grants FY2025still arriving
22
States reached
$85k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0198% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.

Environment$834kArts & Culture$515kAnimals$494kHealth$432kFood & Nutrition$173kPublic Benefit$160kCrime & Legal$159kInternational$115kOther$0
02FY2025 · 45 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k30 grants · $75k
  • $10k–50k14 grants · $236k
  • $50k–250k1 grant · $85k
$5,000
Median grant
22
States reached
$6.2M
Total assets
Largest grants
RecipientAmount
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
PRO PUBLICA$10,000
COMMITTEE TO PROJECT JOURNALISTS$10,000
BERMUDA INSTITUTE OF OCEAN$10,000
LUCY BURNS INSTITUTE$10,000
NAT'L ASSOC OF CHILDREN ADDICTIONS$10,000
MIAMI PROJECT TO CURE PARALYSIS$10,000
ALLIANCE FOR SAFETY & JUSTICE$10,000
EARTH ALLIES RESTORATION NETWORK$10,000
RURAL ADVANCEMENT FOUNDATION INT'L$10,000
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Its 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. Its grants skew toward lower-need ZIPs.

area typical 10%RIP MEDICAL DEBT: $10k → 13%HEROES ON THE WATER: $10k → 5%THE FAMILY PLACE: $1k → 14%ShelterBox USA: $10k → 10%DOLLAR FOR: $3k → 9%MAMATOTO VILLAGE: $500 → 6%GIBSON CENTER FOR SENIOR SERVICES: $15k → 9%Family & Children Association: $10k → 6%NORTH CONWAY COMMUNITY CENTER: $10k → 9%NORTH CONWAY COMMUNITY CENTER: $5k → 9%MIRIAM'S KITCHEN: $1k → 14%ACCESS YOUTH: $10k → 14%FREEDOM NOW: $5k → 14%ACCESS YOUTH: $3k → 14%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.

Which US states its grants reach

AK
ME
NH
WA
ID
ND
MN
IL
WI
MI
NY
MA
SD
IN
OH
PA
NJ
CT
CA
CO
MO
KY
VA
MD
DE
AZ
NM
TN
NC
SC
DC
OK
LA
AL
GA
TX
FL
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

77%of every dollar goes to organizations it has funded before.
$2.6M · 37 repeat orgs$756k to everyone else

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

Re-uppedFunded once

Organizations

37
110

Total granted

$2.6M
$698k

Median revenue growth · since first grant

0%
+24%

Still filing today

57%
52%

New vs renewed · share of each year

In FY2025, 85% of grant dollars renewed an existing relationship; $58k went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’17’18’19’20’21’22’23’24’25
Human ServicesInternationalFood & NutritionHealthEducationCivil RightsOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). 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

  • IG
    INTERNATIONAL GAME FISH ASSOCIATION INC
    9× · 2017–2025 · $271k · revenue +48%
  • DR
    DIABETES RESEARCH INSTITUTE FOUNDATION INC
    9× · 2017–2025 · $168k · revenue +32%
  • RURAL ADVANCEMENT FOUNDATION INTERNATION
    7× · 2018–2025 · $70k · revenue +424%

Funded once

  • WO
    Wild Oceans Inc Wild Oceans Inc
    one grant, 2019 · $61k
  • FA
    Free Arts of NYC Free Arts of NYC
    one grant, 2019 · $40k
  • TR
    TEAM RUBICON INC
    one grant, 2019 · $25k · revenue -7%
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.

04Its field

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.

1
Environmental Investigation Agency

To establish and promote programs to protect the global climate, forests, wildlife and the natural environment, through research, advocacy, and investigation.

International
2
CarbonPlan

Improving the transparency and scientific integrity of climate solutions through open data and tools.

Environment
3
Us Digital Response

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…

Public Safety & Disaster
4
American Flood Coalition Inc

To drive transformational adaptation to protect communities across the country from higher seas, stronger storms, and more frequent flooding.

Environment
5
Common Future

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…

Community Improvement
6
Actionaid Usa

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…

Social Science
7
The Union of Concerned Scientists Inc

The union of concerned scientists puts rigorous, independent science into action, developing solutions and advocating for a healthy, safe, and just future.

International
8
Open Markets Institute

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.

Education
9
Foodshot Global Inc

Accelerate the transformation to a healthy, sustainable and equitable food system.

Food & Nutrition
10
Wedontwaste Inc

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.

Food & Nutrition
11
Common Impact Inc

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…

Unclassified
12
Climate Breakthrough Inc

To launch breakthrough climate mitigation efforts by identifying, supporting, and unleashing innovative leaders with transformative strategies.

Human Services
How this is measured
The grantee most central to the portfolio’s shape is Local Initiatives Support Corporation; 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.
04the grantee network

97 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. 97 of the 172 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.

1
Load-bearing (≥25% of a budget)
19
Early backer (in before they grew)
94/97
Grantees still filing
45/97
Grew since first funded

Where the money sits, by cause and then by grantee

WILD OCEANS INC: $661,000 · OtherWILD OCEANS INCFREE ARTS OF NYC: $336,000 · OtherFREE ARTS OF NYCHEARTSTRONG HORSEMANSHIP INC: $112,500 · Other+129 more: $1,269,500 · Other+129 moreINTERNATIONAL GAME FISH ASSOCIATION INC: $271,000 · Arts & CultureINTERNATIO…PRO PUBLICA INC: $20,000 · Arts & CulturePRO PUBLIC…+2 more: $5,500 · Arts & CultureDIABETES RESEARCH INSTITUTE FOUNDATION INC: $167,500 · HealthALZHEIMER'S DISEASE & RELATED DISORDERS ASSOCIATION INC: $10,000 · HealthPromise Resource Network Inc: $7,500 · Health+2 more: $4,500 · HealthRURAL ADVANCEMENT FOUNDATION INTERNATION: $70,000 · InternationalRAZOM INC: $20,000 · InternationalLELEKA FOUNDATION: $20,000 · InternationalNOVA UKRAINE: $20,000 · InternationalInternational Rescue Committee INC: $7,500 · InternationalPROJECT HOPE - THE PEOPLE-TO-PEOPLE HEALTH FOUNDATION INC: $5,000 · InternationalTHE CENTER FOR ADVANCED DEFENSE STUDIES: $5,000 · International+2 more: $1,500 · InternationalBONEFISH & TARPON TRUST INC: $112,000 · AnimalsWILDLIFE ALLIANCE INC: $12,500 · AnimalsNOMADIC GUARDIANS FOUNDATION: $10,000 · Animals+1 more: $500 · AnimalsNORTH CONWAY COMMUNITY CENTER: $15,000 · Human ServicesGIBSON CENTER FOR SENIOR SERVICES INC: $15,000 · Human ServicesACCESS INC: $12,500 · Human ServicesFAMILY AND CHILDREN'S ASSOCIATION INC: $10,000 · Human ServicesMEDICAL DEBT RESOLUTION INC: $10,000 · Human ServicesSHELTERBOX USA INC: $10,000 · Human ServicesHEROES ON THE WATER INC: $10,000 · Human ServicesFREEDOM NOW INC: $5,000 · Human Services+6 more: $11,000 · Human ServicesLUCY BURNS INSTITUTE INC: $60,000 · Public BenefitPROJECT ON GOVERNMENT OVERSIGHT INC: $10,000 · Public Benefit+2 more: $2,000 · Public Benefit
Other$2,379,000Arts & Culture$296,500Health$189,500International$149,000Animals$135,000Human Services$98,500Public Benefit$72,000

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetWILD OCEANS INC: $661,000 over 8y, 24% of budgetINTERNATIONAL GAME FISH ASSOCIATION INC: $271,000 over 9y, 1.5% of budgetDIABETES RESEARCH INSTITUTE FOUNDATION INC: $167,500 over 9y, 0.4% of budgetHEARTSTRONG HORSEMANSHIP INC: $112,500 over 6y, 38% of budgetBONEFISH & TARPON TRUST INC: $112,000 over 8y, 0.7% of budgetRURAL ADVANCEMENT FOUNDATION INTERNATION: $70,000 over 7y, 0.7% of budgetLUCY BURNS INSTITUTE INC: $60,000 over 6y, 0.1% of budgetIslesboro Affordable Property: $47,000 over 4y, 17% of budgetFood On The Stove Inc: $32,500 over 3y, 22% of budgetTHE GROUNDTRUTH PROJECT INC: $32,500 over 5y, 0.1% of budgetALLIANCE FOR SAFETY AND JUSTICE: $30,000 over 3y, 0.0% of budgetTEAM RUBICON INC: $25,000 over 1y, 0.1% of budgetPRO PUBLICA INC: $20,000 over 2y, 0.0% of budgetRAZOM INC: $20,000 over 3y, 0.0% of budgetLELEKA FOUNDATION: $20,000 over 4y, 0.2% of budgetNOVA UKRAINE: $20,000 over 4y, 0.0% of budgetNORTH CONWAY COMMUNITY CENTER: $15,000 over 2y, 2.0% of budgetGIBSON CENTER FOR SENIOR SERVICES INC: $15,000 over 1y, 1.7% of budgetCENTER FOR DEMOCRACY AND TECHNOLOGY: $15,000 over 1y, 0.3% of budgetACCESS INC: $12,500 over 2y, 0.7% of budgetWILDLIFE ALLIANCE INC: $12,500 over 2y, 0.1% of budgetOceanitesInc: $11,000 over 2y, 2.3% of budgetPrison Policy Initiative: $10,000 over 1y, 0.5% of budgetTHE VALLEY FOUNDATION: $10,000 over 1y, 0.1% of budgetTHE BAIL PROJECT INC: $10,000 over 1y, 0.1% of budgetLife After Hate Inc: $10,000 over 1y, 1.3% of budgetFAMILY AND CHILDREN'S ASSOCIATION INC: $10,000 over 1y, 0.1% of budgetPROJECT ON GOVERNMENT OVERSIGHT INC: $10,000 over 1y, 0.2% of budgetSHARE OUR STRENGTH: $10,000 over 1y, 0.0% of budgetTHE MARSHALL PROJECT INC: $10,000 over 1y, 0.2% of budgetMEDICAL DEBT RESOLUTION INC: $10,000 over 1y, 0.0% of budgetALZHEIMER'S DISEASE & RELATED DISORDERS ASSOCIATION INC: $10,000 over 1y, 0.0% of budgetSHELTERBOX USA INC: $10,000 over 1y, 0.1% of budgetNOMADIC GUARDIANS FOUNDATION: $10,000 over 1y, 8.6% of budgetHEROES ON THE WATER INC: $10,000 over 1y, 0.5% of budgetMID-ATLANTIC INNOCENCE PROJECT: $10,000 over 2y, 1.1% of budgetPromise Resource Network Inc: $7,500 over 1y, 0.2% of budgetInternational Rescue Committee INC: $7,500 over 1y, 0.0% of budgetDATAKIND INC: $7,500 over 1y, 0.2% of budgetPROJECT HOPE - THE PEOPLE-TO-PEOPLE HEALTH FOUNDATION INC: $5,000 over 1y, 0.0% of budgetRANK THE VOTE INC: $5,000 over 1y, 0.3% of budgetLOCAL INITIATIVES SUPPORT CORPORATION: $5,000 over 1y, 0.0% of budgetCHEF ANN FOUNDATION: $5,000 over 1y, 0.0% of budgetINSTITUTE FOR NONPROFIT NEWS: $5,000 over 1y, 0.1% of budgetFREEDOM NOW INC: $5,000 over 1y, 0.6% of budgetTHE CENTER FOR ADVANCED DEFENSE STUDIES: $5,000 over 1y, 0.1% of budgetSouthern Smoke Foundation: $5,000 over 2y, 0.1% of budgetLEE INITIATIVE INC: $5,000 over 2y, 0.1% of budget
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 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 PRO PUBLICA INC ↗
  • Who funds RAZOM INC ↗
  • Who funds LELEKA FOUNDATION ↗
  • Who funds NOVA UKRAINE ↗
  • Who funds NORTH CONWAY COMMUNITY CENTER ↗
  • Who funds GIBSON CENTER FOR SENIOR SERVICES INC ↗
  • Who funds CENTER FOR DEMOCRACY AND TECHNOLOGY ↗

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.

Greater Washington Co…The Morris and Gwendo…The New York Communit…Clark Charitable Foun…Eugene & Agnes E Meye…Tides FoundationSilicon Valley Commun…John S and James L Kn…Rockefeller Philanthr…Gs Donor Advised Phil…New Venture FundGlobalgiving Foundati…
Greater Washington Community FoundationDC24× affinity13 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

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

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization Mostyn Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from Mostyn Foundation Inc. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 70%2%6%14%25%funder's share of their income ↑0%25%50%75%100%share of the org’s income from government →median 2%
  • International Game Fish Association Inc: 2% of income from government
  • Guy Harvey Ocean Fund Inc: 0% of income from government
no gov moneyreceives it· size = income
7get no government money at all
30report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
typical government reliance, FY20–25
How this is measured
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 a grant caused the public funding. Coverage is precision-first, a floor rather than 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 to 24 months.
05Through Plinth

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.

On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 172 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

How this is measured
Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Mostyn’s filings →

More from the funding graph

The unnamed billions
grants reported with no recipient in the public record
The regranting layer
51% of grant dollars land in the regranting layer
The DAF merry-go-round
$9.7B circulates between donor-advised funds
The endowment market
who holds foundation money, and what just moved
The camps
funders cluster by geography, not ideology
By state
where grant money is based, and what stays home