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The Martin & Barbara Zweig Foundation Inc at a glance

· Private foundation

The Martin & Barbara Zweig 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.

$111k
Granted FY2025still arriving
4
Grants FY2025still arriving
4
States reached
$29k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0188% classified

What it funded, over time

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

Philanthropy$3.9MHealth$1.1MAnimals$290kPublic Safety & Disaster$60kFood & Nutrition$53kHousing & Shelter$43kEducation$34kCivil Rights$29kOther$0
02FY2025 · 4 grants

Where the money goes

Grants by size, and the largest recipients.

$27,500
Median grant
4
States reached
$0
Total assets
Largest grants
RecipientAmount
THE AMERICAN SOCIETY FOR THE PREVEN$28,791
Individual grant recipient$27,500
FEEDING AMERICA$27,500
WORLD CENTRAL KITCHEN INC$27,500
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 (FY18–20, $38k) land where the poverty rate runs at 16%, against an area that typically sits at 11%. 93% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 11%American Red Cross: $3k → 8%The Center For Pursuit: $10k → 16%Puppies Behind Bars: $20k → 17%HORIZONS FOR HOMELESS CHILDREN: $3k → 16%CRADLES TO CRAYONS: $3k → 16%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

IL
NY
MA
IA
OH
CA
UT
NM
DC
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.
$4.6M · 8 repeat orgs$1.3M to everyone else

Grantees it renews have grown median revenue +80% since the first grant, against +37% for those funded once.

8 repeat relationships: 0 still active in FY2025, 8 since wound down; 4 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

8
27

Total granted

$4.6M
$1.2M

Median revenue growth · since first grant

+80%
+37%

Still filing today

25%
63%

New vs renewed · share of each year

In FY2025, 0% of grant dollars renewed an existing relationship; $111k went to new ones.

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

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

’17’18’19’20’22’25
Human ServicesEnvironmentFood & NutritionAnimalsEducationHealthOther
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

  • FC
    Fidelity Charitable Giving Account
    2× · 2019–2022 · $3.6M
  • IG
    Individual grant recipient
    3× · 2017–2019 · $325k
  • DF
    DWYER FAMILY FUND - BOA CHARITABLE
    3× · 2017–2019 · $325k

Funded once

  • MS
    MOUNT SINAI MEDICAL CENTER
    one grant, 2017 · $500k
  • TM
    THE MOUNT SINAI MEDICAL CENTER
    one grant, 2018 · $500k · revenue -163%
  • AN
    American National Red Cross & Its Constituent Chapters and Branchesgraduated
    one grant, 2020 · $28k · revenue +38%
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
Ocean Conservancy

Ocean conservancy unites science, people, and policy to protect our ocean, today and for generations to come.

Environment
2
Sustainable Fisheries Partnership Foundation

To engage and catalyze global seafood supply chains in rebuilding depleted fish stocks and reducing the environmental impacts of fishing and fish farming.

Animals
3
Conservation International Foundation

Ci works to spotlight and secure the critical benefits that nature provides to humanity.

Environment
4
New York Genome Center Inc

Operate a state-of-the-art, world-class genomic research center that creates and uses advanced genomics to understand the genetic basis of disease. for more information, see schedule o.

Health
5
Project Drawdown

Project drawdown's mission is to drive meaningful climate action by advancing science-based solutions and strategies. project drawdown's work is focused on three pillars: science - advancing science-based climate solutions and strategies;…

Education
6
World Wildlife Fund Inc

Wwf's mission is to conserve nature and reduce the most pressing threats to the diversity of life on earth. (continued on schedule o)

Environment
7
Climate Institute

The climate institute is organized for the purpose of educating the general public and policy makers as to the gravity of potential climate change, exploring the policy implications of the latest scientific findings on climate modelling…

Environment
8
Conservation Law Foundation Inc

Conservation law foundation, inc. (clf) protects new england's environment for the benefit of all people and future generations. we use the law, science, and markets to create solutions that preserve and restore our natural resources,…

Environment
9
American Humane Association

Founded in 1877, american humane association, dba american humane society (american humane) is committed to ensuring the safety, welfare and well-being of animals. our leadership programs are first to serve in promoting and nurturing the…

Animals
10
Massachusetts Institute of Technology

The mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.

Education
11
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.

—
12
New York University

Nyu is a private university with approximately 60,000 matriculating students in 20 schools and institutes. nyu's primary missions are education, research and scholarship, and patient care.

Education
How this is measured
The grantee most central to the portfolio’s shape is Cradles to Crayons Inc; the most unlike its peers is City Lax 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

23 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. 23 of the 39 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)
2
Early backer (in before they grew)
21/23
Grantees still filing
15/23
Grew since first funded

Where the money sits, by cause and then by grantee

Fidelity Charitable Giving Account: $3,600,000 · OtherFidelity Charitable Giving AccountMOUNT SINAI MEDICAL CENTER: $500,000 · OtherMOUNT SINAI MEDICAL CENTERIndividual grant recipient: $325,000 · OtherIndividual grant recipientDWYER FAMILY FUND - BOA CHARITABLE: $325,000 · OtherDWYER FAMILY FUND - BOA CHARITABLE+21 more: $292,791 · Other+21 moreTHE MOUNT SINAI MEDICAL CENTER: $500,000 · HealthTHE MOUNT…THE AMERICAN SOCIETY FOR THE PREVENTION OF CRUELTY TO ANIMALS: $210,000 · AnimalsNORTH SHORE ANIMAL LEAGUE AMERICA INC: $10,000 · AnimalsAmerican National Red Cross & Its Constituent Chapters and Branches: $27,500 · Human ServicesPUPPIES BEHIND BARS INC: $20,000 · Human ServicesTHE CENTER FOR PURSUIT: $10,000 · Human ServicesHORIZONS FOR HOMELESS CHILDREN: $2,500 · Human ServicesCRADLES TO CRAYONS INC: $2,500 · Human ServicesFeeding America: $27,500 · Food & NutritionREDWOOD EMPIRE FOOD BANK: $25,000 · Food & NutritionWORLD CENTRAL KITCHEN INC: $27,500 · InternationalTHE EVERGLADES FOUNDATION INC: $20,000 · EnvironmentNANTUCKET LAND & WATER COUNCIL INC: $5,000 · EnvironmentNATURAL RESOURCES DEFENSE COUNCIL INC: $1,000 · Environment
Other$5,042,791Health$500,000Animals$220,000Human Services$62,500Food & Nutrition$52,500International$27,500Environment$26,000

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

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetTHE AMERICAN SOCIETY FOR THE PREVENTION OF CRUELTY TO ANIMALS: $210,000 over 3y, 0.0% of budgetFeeding America: $27,500 over 1y, 0.0% of budgetAmerican National Red Cross & Its Constituent Chapters and Branches: $27,500 over 1y, 0.0% of budgetREDWOOD EMPIRE FOOD BANK: $25,000 over 1y, 0.1% of budgetTREVOR PROJECT INC: $20,000 over 2y, 0.1% of budgetTHE EVERGLADES FOUNDATION INC: $20,000 over 1y, 0.2% of budgetPUPPIES BEHIND BARS INC: $20,000 over 1y, 0.6% of budgetNORTH SHORE ANIMAL LEAGUE AMERICA INC: $10,000 over 1y, 0.0% of budgetMCCRAE JAMES WILLIAMS FOUNDATION INC: $10,000 over 1y, 54% of budgetTHE CENTER FOR PURSUIT: $10,000 over 1y, 0.1% of budgetCOLGATE UNIVERSITY: $10,000 over 1y, 0.0% of budgetBaylor College of Medicine: $5,000 over 1y, 0.0% of budgetNANTUCKET LAND & WATER COUNCIL INC: $5,000 over 1y, 0.4% of budgetFISHER ISLAND PHILANTHROPIC FUND INC: $5,000 over 1y, 2.4% of budgetTHE FOUNDERS FUND INC: $5,000 over 1y, 0.4% of budgetHORIZONS FOR HOMELESS CHILDREN: $2,500 over 1y, 0.0% of budgetCRADLES TO CRAYONS INC: $2,500 over 1y, 0.0% of budgetCITY LAX INC: $2,000 over 1y, 0.5% of budgetNATURAL RESOURCES DEFENSE COUNCIL 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 Ayco Charitable F…National Philanthropi…Vanguard Charitable E…Donor Advised Charita…Fidelity Investments …Amazonsmile Foundation
The Ayco Charitable FoundationNY12.4× affinity4 shared granteesties to 5 of 5Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Ayco Charitable Foundation · National Philanthropic Trust · Vanguard Charitable Endowment Program · Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile 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 The Martin & Barbara Zweig Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from The Martin & Barbara Zweig Foundation Inc. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 40%4%15%34%60%funder's share of their income ↑0%23%45%68%90%share of the org’s income from government →median 21%
  • Horizons for Homeless Children: 21% of income from government
  • Cradles to Crayons Inc: 2% of income from government
no gov moneyreceives it· size = income
4get no government money at all
4report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–90%
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 Martin & Barbara Zweig Foundation Inc?

Find your warmest path to The Martin & Barbara Zweig 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 39 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 Martin & Barbara Zweig’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