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William J and Isobel G Clarke Foundation at a glance

· Private foundation

William J and Isobel G Clarke Foundation

Its FY2026 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$70k
Granted FY2026still arriving
9
Grants FY2026still arriving
2
States reached
$30k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0193% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2021 to 2026.

Philanthropy$73kArts & Culture$65kHuman Services$63kReligion$45kYouth Development$40kEducation$39kEnvironment$35kHealth$35kOther$0
02FY2026 · 9 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2026

  • Under $10k8 grants · $40k
  • $10k–50k1 grant · $30k
$5,000
Median grant
2
States reached
$1.5M
Total assets
Largest grants
RecipientAmount
CHRIST THE KING LUTHERAN CHURCH$30,000
CIVIC CHORALE OF GREATER MIAMI$7,500
LIVE LIKE BELLA PARK$5,000
JUNIOR ORANGE BOWL COMMITTEE$5,000
CORAL GABLES COMMUNITY FOUNDATION$5,000
EPILEPSY FOUNDATION$5,000
Individual grant recipient$5,000
SOCIETY OF ST ANDREW$5,000
VOLUNTEER CENTER OF FAIRFAX COUNTY$2,500
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 (FY22–25, $25k) land where the poverty rate runs at 12%, against an area that typically sits at 11%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 11%AYUDA: $5k → 14%NEW HORIZON SERVICE DOGS INC: $10k → 12%NEW HORIZON SERVICE DOGS INC: $10k → 12%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.
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.

37%of every dollar goes to organizations it has funded before.
$172k · 9 repeat orgs$294k to everyone else

Grantees it renews have grown median revenue +3% since the first grant, against 0% for those funded once.

9 repeat relationships: 3 still active in FY2026, 6 since wound down; 5 grantees were first funded in FY2026 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

9
33

Total granted

$172k
$272k

Median revenue growth · since first grant

+3%
0%

Still filing today

78%
42%

New vs renewed · share of each year

In FY2026, 65% of grant dollars renewed an existing relationship; $23k went to new ones.

50%100%’21’22’23’24’25’26
RenewedFirst-time

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

’21’22’23’24’25’26
EducationCrime & LegalHuman ServicesArts & CultureEnvironmentReligionOther
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

  • KH
    KRISTI HOUSE INC
    2× · 2022–2023 · $20k · revenue +40%
  • CG
    CORAL GABLES GARDEN CLUB INC
    2× · 2022–2024 · $20k · revenue +27%
  • GI
    GABLESTAGE INC
    2× · 2024–2025 · $20k · revenue +3%

Funded once

  • GC
    GABLES COMMUNITY FOUNDATION
    one grant, 2021 · $50k
  • EI
    ENCOUNTERS IN EXCELLENCE INC
    one grant, 2022 · $15k · revenue -7%
  • FM
    FROST MUSEUM
    one grant, 2021 · $10k
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
Communities in Schools of Miami Inc

The mission of communities in schools is to surround students with a community of support, empowering them to stay in school and achieve in life.

—
2
Miami-Dade Innovation Authority Inc

Miami-dade innovation authority bridges the gap between private innovators and the public sector to fast track innovation that improves quality of life for miamians.

Science & Tech
3
Equality Florida Institute Inc

Equality florida institute is the educational arm of the largest civil rights organization in florida dedicated to ending discrimination based on sexual orientation and gender identity.

Civil Rights
4
The Miami Foundation Inc

To create a greater miami where everyone can thrive by accelerating generosity, leadership, and community engagement. the miami foundation serves as a philanthropic and community backbone for greater miami, bringing together donors,…

Philanthropy
5
Court Appointed Special Advocate Guardian Ad Litem of Miami Co Inc

To provide dedicated volunteers to advocate in court for the best interests of children who have experienced abuse or neglect.

Human Services
6
Florida Immigrant Coalition Inc

To focuses on public education and advocacy to generate public awareness of programs and services available to immigrants in Florida.

Civil Rights
7
Adrienne Arsht Center Trust Inc

The adrienne arsht center is a leader in presenting innovative programming that mirrors south florida's diversity, as well as a catalyst for billions of dollars in new development in the downtown area. the center presents nearly 400 events…

Arts & Culture
8
Greater Miami Service Corps

Developing and administering a volunteer service program consisting principally of youth volunteers, which benefit the community by providing this needed public service. the program also develops employment opportunities for the youth.

Employment
9
Housing Opportunities Project for Excellence Inc

Hope incs mission is to fight housing discrimination in miami-dade and broward counties and to promote equal housing opportunities throughout the state of florida.

Housing & Shelter
10
Parks Foundation of Miami-Dadeinc

To foster the recreational, educational, environmental and cultural life of the miami-dade county community by encouraging and soliciting support for our county's park system.

Recreation & Sports
11
Equality Florida Action Inc

Equality florida action is the advocacy arm of the largest civil rights organization working to secure full equality for florida's lesbian, gay, bisexual, transgender, and queer (lgbtq) community.(continued on schedule o)we work to pass…

Civil Rights
12
Saint Andrew's School of Boca Raton Inc

Saint andrew's school is an independent school founded in the episcopal tradition. our mission is to build a community of learners, provide excellence in education, and nurture each student in mind, body, and spirit.

Education
How this is measured
The grantee most central to the portfolio’s shape is Junior Orange Bowl Committee Inc; the most unlike its peers is Actors' Playhouse Productions Inc. 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

24 grantees tracked through their own filings, 2017–2026.

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 2026, not grant rows in a single year, so this will not match the grant count on the cover. 24 of the 48 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.

0
Load-bearing (≥25% of a budget)
0
Early backer (in before they grew)
24/24
Grantees still filing
11/24
Grew since first funded

Where the money sits, by cause and then by grantee

GABLES COMMUNITY FOUNDATION: $50,000 · OtherGABLES COMMUNITY FOUNDATIONCHRIST THE KING LUTHERAN CHURCH: $31,500 · OtherCHRIST THE KING LUTHERAN CHURCHLIGHTHOUSE FOR THE BLIND: $20,000 · OtherLIGHTHOUSE FOR THE BLINDGABLESTAGE INC: $20,000 · OtherGABLESTAGE INCJUNIOR ORANGE BOWL COMMITTEE INC: $20,000 · OtherJUNIOR ORANGE BOWL COMMITTEE INCENCOUNTERS IN EXCELLENCE INC: $15,000 · Other+29 more: $176,000 · Other+29 moreCHILDREN'S BEREAVEMENT CENTER INC: $10,000 · EducationCHILDREN'…Teach for America Inc: $10,000 · EducationTeach for…PROJECT YESINC: $10,000 · EducationPROJECT Y…THE POSSE FOUNDATION INC: $7,500 · EducationTHE POSSE…+1 more: $1,000 · EducationKRISTI HOUSE INC: $20,000 · Crime & LegalAMERICANS FOR IMMIGRANT JUSTICE INC F/K/A FLA IMMIGRANT ADVOCACY CENTER: $10,000 · Crime & LegalNEW HORIZONS SERVICE DOGS: $20,000 · Human ServicesAYUDA INC: $5,000 · Human ServicesCORAL GABLES GARDEN CLUB INC: $20,000 · EnvironmentTHE MOUNT VERNON LADIES' ASSOCIATION OF THE UNION: $10,000 · Arts & CultureACTORS' PLAYHOUSE PRODUCTIONS INC: $5,000 · Arts & CultureSAMARITAN'S PURSE: $10,000 · Religion
Other$332,500Education$38,500Crime & Legal$30,000Human Services$25,000Environment$20,000Arts & Culture$15,000Religion$10,000

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 budgetKRISTI HOUSE INC: $20,000 over 2y, 0.2% of budgetNEW HORIZONS SERVICE DOGS: $20,000 over 2y, 1.8% of budgetCORAL GABLES GARDEN CLUB INC: $20,000 over 2y, 16% of budgetGABLESTAGE INC: $20,000 over 2y, 0.4% of budgetJUNIOR ORANGE BOWL COMMITTEE INC: $20,000 over 3y, 1.6% of budgetENCOUNTERS IN EXCELLENCE INC: $15,000 over 1y, 16% of budgetCIVIC CHORALE OF GREATER MIAMI INC: $10,000 over 2y, 8.7% of budgetSAMARITAN'S PURSE: $10,000 over 1y, 0.0% of budgetAMERICANS FOR IMMIGRANT JUSTICE INC F/K/A FLA IMMIGRANT ADVOCACY CENTER: $10,000 over 1y, 0.2% of budgetCHILDREN'S BEREAVEMENT CENTER INC: $10,000 over 1y, 0.6% of budgetTeach for America Inc: $10,000 over 1y, 0.0% of budgetTHE MOUNT VERNON LADIES' ASSOCIATION OF THE UNION: $10,000 over 1y, 0.0% of budgetPROJECT YESINC: $10,000 over 2y, 0.8% of budgetZOO MIAMI FOUNDATION INC: $10,000 over 1y, 0.1% of budgetTHE POSSE FOUNDATION INC: $7,500 over 1y, 0.0% of budgetCORAL GABLES COMMUNITY FOUNDATION INC: $5,500 over 2y, 0.0% of budgetAYUDA INC: $5,000 over 1y, 0.0% of budgetPARKINSON'S FOUNDATION INC: $5,000 over 1y, 0.0% of budgetMIAMI SYMPHONY ORCHESTRA INC: $5,000 over 1y, 0.4% of budgetDADE HERITAGE TRUST INC: $5,000 over 1y, 0.2% of budgetCARE ELEMENTARY SCHOOL INC: $1,000 over 1y, 0.0% 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.

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.

The Batchelor Foundat…Mightycause Charitabl…The Miami Foundation …Dunspaugh Dalton Foun…The Kirk FoundationWilliam J and Tina Ro…The Elizabeth C Lambe…Peacock Foundation IncGreater Miami Jewish …United Way Miami IncThe Sain-Orr and Roya…Assurant Foundation
The Batchelor Foundation IncFL28.2× affinity11 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Batchelor Foundation Inc · Mightycause Charitable Foundation · The Miami Foundation Inc · Dunspaugh Dalton Foundation Inc · The Kirk Foundation · William J and Tina Rosenberg · The Elizabeth C Lambertson Foundation · Peacock Foundation Inc · Greater Miami Jewish Federation Inc · United Way Miami Inc · The Sain-Orr and Royak-Deforest Steadman Foundation · Assurant Foundation

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 William J and Isobel G Clarke Foundation funds: left to right is the share of its income from government, bottom to top the share from William J and Isobel G Clarke Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 60%1%5%11%20%funder's share of their income ↑0%13%25%38%50%share of the org’s income from government →median 8%
  • Kristi House Inc: 49% of income from government
  • Care Elementary School Inc: 8% of income from government
  • Zoo Miami Foundation Inc: 0% of income from government
no gov moneyreceives it· size = income
6get no government money at all
8report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–50%
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 William J and Isobel G Clarke Foundation?

Find your warmest path to William J and Isobel G Clarke 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.

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 48 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 2026, released 2026. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on William J and Isobel G Clarke’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