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The Sidney Fleck Charitable Foundation Inc at a glance

· Private foundation

The Sidney Fleck Charitable Foundation Inc

Its FY2024 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.

$26k
Granted FY2024still arriving
20
Grants FY2024still arriving
9
States reached
$6k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0197% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2019 to 2024.

Health$42kPhilanthropy$20kCivil Rights$12kInternational$10kHuman Services$7kEnvironment$7kArts & Culture$6kReligion$6kOther$0
02FY2024 · 20 grants

Where the money goes

Grants by size, and the largest recipients.

$1,000
Median grant
9
States reached
$395k
Total assets
Largest grants
RecipientAmount
Project ALS$5,500
COMBINED JEWISH PHILANTHROPIES$4,500
Individual grant recipient$2,500
Friends of Israel Defense Forces$1,500
Doggo$1,041
Partnership with Native Americans$1,000
People for Ethical Treatment of Animals$1,000
THE CARTER CENTER$1,000
Native American Heritage Association$1,000
MASSPIRG EDUCATION FUND$1,000
DANA FARBER CANCER INSTITUTE$725
JOSLIN DIABETES CENTER$710
MGH Fund$700
Newton-Wellesley Hospital Fund$700
American Friends of Magen David Adom$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 (FY19–24, $6k) land where the poverty rate runs at 13%, against an area that typically sits at 10%. 84% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 10%Partnership with Native Americans: $1k → 14%The Wounded Warrior Project: $500 → 14%Soles 4 Souls: $500 → 14%American Indian Services: $500 → 8%Wounded Warrior Project: $500 → 14%Honor Flight: $500 → 7%The Wounded Warrior Project: $250 → 14%Soles4Souls: $500 → 14%Wounded Warrior Project: $500 → 14%Union Rescue Mission: $500 → 14%Wounded Warrior Project: $500 → 14%IRAQ AND AFGHANISTAN VETERANS OF AMERICA: $200 → 17%IRAQ AND AFGHANISTAN VETERANS OF AMERICA: $150 → 17%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

WA
MN
IL
MI
NY
MA
SD
IN
OH
NJ
CA
UT
CO
VA
MD
TN
DC
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.

81%of every dollar goes to organizations it has funded before.
$106k · 45 repeat orgs$24k to everyone else

45 repeat relationships: 11 still active in FY2024, 34 since wound down; 8 grantees were first funded in FY2024 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

45
33

Total granted

$106k
$18k

Median revenue growth · since first grant

+27%
+61%

Still filing today

71%
70%

New vs renewed · share of each year

In FY2024, 69% of grant dollars renewed an existing relationship; $7k went to new ones.

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

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

’19’20’21’22’23’24
HealthInternationalHuman ServicesCivil RightsEnvironmentEducationOther
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

  • SP
    SOUTHERN POVERTY LAW CENTER INC
    5× · 2019–2023 · $4k · revenue +28%
  • NA
    Native American Heritage Association
    2× · 2023–2024 · $4k · revenue +7%
  • TC
    THE CARTER CENTER INC
    6× · 2019–2024 · $3k · revenue +27%

Funded once

  • FR
    FOXG1 Research Incgraduated
    one grant, 2021 · $3k · revenue +145%
  • KI
    Kehillat Israel
    2× · 2022–2023 · $2k
  • NR
    NEW ROADS SCHOOLgraduated
    one grant, 2019 · $1k · revenue +26%
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
International Aids Vaccine Initiative Inc

A nonprofit scientific research organization that develops vaccines and antibodies for hiv, tuberculosis, and emerging infectious diseases.

International
2
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
3
Center for International Environmental Law Inc

To investigate, research, write, publish, present conferences and teach with respect to global, regional, transboundary, and comparative environmental issues and to make the findings from such activities available to the general public; to…

International
4
International Life Sciences Institute

Ilsi is a global, nonprofit federation dedicated to generating and advancing emerging science and groundbreaking research to ensure foods are safe, nutritious and sustainable, and that they improve planetary and human health and well-being…

Science & Tech
5
United States Naval Institute

Provide an independent forum for those who dare to read, think, speak, and write to advance the professional, literary, and scientific understanding of sea power and other issues critical to global security.

—
6
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
7
Indigenous Peoples Rights Inc

To lead and coordinate the global initiative to address and prevent criminalization, violence, and impunity against indigenous peoples towards strengthening their collectives, solidarity, and actions.

Human Services
8
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
9
World Resources Institute

Wri is committed to creating change that improves people's lives and ensures the natural world can thrive. (see schedule o)wri's bold vision requires a formula for success we call "count it. change it. scale it.":- count it: our work is…

International
10
Friends of the Earth

Friends of the earth strives for a more healthy and just world by defendng the environment and human health while advancing social and economic justice by conducting research and education, transforming the economy so it protects the…

Environment
11
Asociacion Interamericana Para La Defensa Del Ambiente

To strenghten people's ability to guarantee their individual and collective right to a healthy environment, via the development, implementation, and effective enforcement of national and international law.

Crime & Legal
12
Internet Society Foundation

At the internet society foundation, we focus on funding initiatives that strengthen the internet in function and reach so that it can effectively serve all people. our work advances the vision of the internet society (isoc): the internet…

International
How this is measured
The grantee most central to the portfolio’s shape is Human Rights Watch Inc; the most unlike its peers is Eiteljorg Museum of American Indians and Western Art 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

64 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. 64 of the 88 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)
9
Early backer (in before they grew)
63/64
Grantees still filing
43/64
Grew since first funded

Where the money sits, by cause and then by grantee

Individual grant recipient: $6,200 · OtherIndividual grant recipientAnova: $4,640 · OtherAnovaKEHILLAT ISRAEL RECONSTRUCTIONIST CONGREGATION OF PACIFIC PALISADES: $4,250 · OtherKEHILLAT ISRAEL RECONSTRUCTIONIST CONGREGATION OF …FAULT LINE THEATRE COMPANY: $4,000 · OtherFAULT LINE THEATRE COMPANYPUBLIC COMMUNICATORS INC: $4,000 · OtherPUBLIC COMMUNICATORS INCMGH Fund: $2,500 · OtherNewton-Wellesley Hospital Fund: $2,200 · OtherENVIRONMENTAL DEFENSE FUND INCORPORATED: $2,500 · OtherMASSACHUSETTS PUBLIC INTEREST RESEARCH GROUP EDUCATION FUND INC: $4,100 · OtherMASSACHUSETTS PUBLIC INTEREST RESEARCH GROUP EDUCA…+42 more: $30,694 · Other+42 morePROJECT ALS INC: $24,293 · HealthPROJECT ALS INCFOXG1 Research Inc: $2,500 · HealthFOXG1 Research IncJOSLIN DIABETES CENTER INC: $2,360 · HealthJOSLIN DIABETES CENTER INCDana-Farber Cancer Institute Inc: $1,975 · HealthDana-Farber Cancer Institu…+6 more: $2,600 · Health+6 moreCombined Jewish Philanthropies of Greater Boston Inc: $16,000 · PhilanthropyCombined Jew…+1 more: $250 · PhilanthropyTHE CARTER CENTER INC: $2,800 · InternationalFRIENDS OF THE ISRAEL DEFENSE FORCES: $1,500 · InternationalMEDECINS SANS FRONTIERES USA INC: $1,200 · InternationalInternational Rescue Committee INC: $1,150 · InternationalEDPOWERMENT INC: $1,100 · InternationalHIAS INC: $500 · InternationalAMERICAN FRIENDS OF MAGEN DAVID ADOM: $500 · International+1 more: $300 · InternationalTREVOR PROJECT INC: $2,200 · Civil RightsNAACP LEGAL DEFENSE & EDUC FUND INC: $2,200 · Civil RightsEQUAL JUSTICE INITIATIVE: $1,700 · Civil RightsREFUGEE & IMMIGRANT CENTER FOR EDUCATION & LEGAL SERVICES: $1,500 · Civil RightsHUMAN RIGHTS CAMPAIGN INC: $400 · Civil RightsACLU FOUNDATION OF MASSACHUSETTS INC: $300 · Civil RightsSOUTHERN POVERTY LAW CENTER INC: $3,535 · Crime & LegalNative American Heritage Association: $3,500 · Crime & LegalENVIRONMENTAL DEFENSE CENTER: $400 · Crime & LegalWOUNDED WARRIOR PROJECT INC: $2,250 · Human ServicesPartnership With Native Americans: $1,000 · Human ServicesSOLES4SOULS INC: $1,000 · Human ServicesUNION RESCUE MISSION: $500 · Human ServicesHONOR FLIGHT INC: $500 · Human ServicesAmerican Indian Services: $500 · Human ServicesIRAQ AND AFGHANISTAN VETERANS OF AMERICA INC: $350 · Human ServicesDay One of New York Inc: $300 · Human Services
Other$65,084Health$33,728Philanthropy$16,250International$9,050Civil Rights$8,300Crime & Legal$7,435Human Services$6,400

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 budgetPROJECT ALS INC: $24,293 over 6y, 0.2% of budgetCombined Jewish Philanthropies of Greater Boston Inc: $16,000 over 6y, 0.0% of budgetMASSACHUSETTS PUBLIC INTEREST RESEARCH GROUP EDUCATION FUND INC: $4,100 over 6y, 0.3% of budgetPUBLIC COMMUNICATORS INC: $4,000 over 5y, 0.0% of budgetSOUTHERN POVERTY LAW CENTER INC: $3,535 over 5y, 0.0% of budgetNative American Heritage Association: $3,500 over 2y, 0.0% of budgetTHE CARTER CENTER INC: $2,800 over 6y, 0.0% of budgetENVIRONMENTAL DEFENSE FUND INCORPORATED: $2,500 over 4y, 0.0% of budgetFOXG1 Research Inc: $2,500 over 1y, 0.1% of budgetJOSLIN DIABETES CENTER INC: $2,360 over 6y, 0.0% of budgetWOUNDED WARRIOR PROJECT INC: $2,250 over 5y, 0.0% of budgetTREVOR PROJECT INC: $2,200 over 5y, 0.0% of budgetNAACP LEGAL DEFENSE & EDUC FUND INC: $2,200 over 5y, 0.0% of budgetDana-Farber Cancer Institute Inc: $1,975 over 6y, 0.0% of budgetANIMAL RESCUE FUND OF THE HAMPTONS INC: $1,800 over 4y, 0.0% of budgetHOFFMAN INSTITUTE FOUNDATION: $1,750 over 4y, 0.0% of budgetEQUAL JUSTICE INITIATIVE: $1,700 over 5y, 0.0% of budgetREFUGEE & IMMIGRANT CENTER FOR EDUCATION & LEGAL SERVICES: $1,500 over 5y, 0.0% of budgetKEREN OR INC: $1,500 over 4y, 0.0% of budgetFRIENDS OF THE ISRAEL DEFENSE FORCES: $1,500 over 1y, 0.0% of budgetNATIONAL PARKS CONSERVATION ASSOCIATION: $1,500 over 3y, 0.0% of budgetNEW ROADS SCHOOL: $1,275 over 1y, 0.0% of budgetMEDECINS SANS FRONTIERES USA INC: $1,200 over 4y, 0.0% of budgetInternational Rescue Committee INC: $1,150 over 4y, 0.0% of budgetTHE CONSCIOUS ALLIANCE: $1,115 over 2y, 0.0% of budgetEDPOWERMENT INC: $1,100 over 3y, 0.2% of budgetPartnership With Native Americans: $1,000 over 1y, 0.0% of budgetNATIONAL PEDIATRIC CANCER FOUNDATION INC: $1,000 over 2y, 0.0% of budgetSOLES4SOULS INC: $1,000 over 3y, 0.0% of budgetHOMEBOY INDUSTRIES: $1,000 over 3y, 0.0% of budgetWORLD WILDLIFE FUND INC: $1,000 over 3y, 0.0% of budgetHAMPTONS COMMUNITY OUTREACH INC: $817 over 2y, 0.0% of budgetDIDI HIRSCH PSYCHIATRIC SERVICE: $500 over 1y, 0.0% of budgetHIAS INC: $500 over 1y, 0.0% of budgetFRIENDS OF UNITED HATZALAH INC: $500 over 1y, 0.0% of budgetUNION RESCUE MISSION: $500 over 1y, 0.0% of budgetAMERICAN FRIENDS OF MAGEN DAVID ADOM: $500 over 1y, 0.0% of budgetEITELJORG MUSEUM OF AMERICAN INDIANS AND WESTERN ART INC: $500 over 1y, 0.0% of budgetAMERICAN CANCER SOCIETY INC: $500 over 1y, 0.0% of budgetFIRST NATIONS DEVELOPMENT INSTITUTE: $500 over 1y, 0.0% of budgetHONOR FLIGHT INC: $500 over 1y, 0.0% of budgetAmerican Indian Services: $500 over 1y, 0.0% of budgetENVIRONMENTAL DEFENSE CENTER: $400 over 2y, 0.0% of budgetHUMAN RIGHTS CAMPAIGN INC: $400 over 2y, 0.0% of budgetKIVUNIM: $360 over 1y, 0.0% of budgetIRAQ AND AFGHANISTAN VETERANS OF AMERICA INC: $350 over 2y, 0.0% of budgetPFLAG: $350 over 2y, 0.0% of budgetEAST HAMPTON FOOD PANTRY INC: $316 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.

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.

Jewish Communal FundVanguard Charitable E…California Community …Jpmorgan Chase Founda…Synchrony FoundationNational Philanthropi…Gs Donor Advised Phil…ImpactassetsincThe Chicago Community…Silicon Valley Commun…The Pfizer Foundation…Morgan Stanley Global…
Jewish Communal FundNY19.1× affinity10 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Jewish Communal Fund · Vanguard Charitable Endowment Program · California Community Foundation · Jpmorgan Chase Foundation · Synchrony Foundation · National Philanthropic Trust · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Impactassetsinc · The Chicago Community Trust · Silicon Valley Community Foundation · The Pfizer Foundation Inc · Morgan Stanley Global Impact Funding Trust 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 The Sidney Fleck Charitable Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from The Sidney Fleck Charitable Foundation Inc. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 50%0%1%3%5%funder's share of their income ↑0%25%50%75%100%share of the org’s income from government →median 7%
  • Hias Inc: 88% of income from government
  • Joslin Diabetes Center Inc: 35% of income from government
  • Dana-Farber Cancer Institute Inc: 7% of income from government
  • Partners in Health a Nonprofit Corporation: 0% of income from government
  • Wounded Warrior Project Inc: 0% of income from government
no gov moneyreceives it· size = income
5get no government money at all
9report government grants on their 990 we could not trace to a source (not plotted)
1rely 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 The Sidney Fleck Charitable Foundation Inc?

Find your warmest path to The Sidney Fleck Charitable 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 88 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 2024, released 2024. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Sidney Fleck’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