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· Private foundation

Joseph M Hamilburg Foundation

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.

$73k
Granted FY2025still arriving
79
Grants FY2025still arriving
15
States reached
$10k
Largest
01What it funds
0193% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2020 to 2025.

Health$229kArts & Culture$56kEducation$36kEnvironment$30kAnimals$27kReligion$10kRecreation & Sports$9kYouth Development$5kOther$0
02FY2025 · 79 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k78 grants · $63k
  • $10k–50k1 grant · $10k
$100
Median grant
15
States reached
$1.1M
Total assets
Largest grants
RecipientAmount
NEW ENGLAND BAPTIST HOSPITAL$10,000
BOSTON BALLET$7,600
BRIGHAM & WOMENS HOSPITAL$5,000
BIDMC (BETH ISRAEL DEACONESS MEDICAL CENTER)$5,000
DANA-FARBER CANCER INSTITUTE$5,000
MASS GENERAL HOSPITAL$5,000
WILDLANDS TRUST$5,000
NEWTON-WELLESLEY HOSPITAL$5,000
TUFTS MEDICAL CENTER$4,000
NEW ENGLAND SKATING CLUB$3,000
MUSEUM OF FINE ARTS BOSTON$3,000
NOBLE & GREENOUGH SCHOOL$2,000
NATIONAL WILD TURKEY FEDERATION$2,000
NEW ENGLAND BAPTIST HOSPITAL$1,500
NOBLE & GREENOUGH SCHOOL$1,000
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 (FY21–25, $200) land where the poverty rate runs at 8%, against an area that typically sits at 10%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Its grants skew toward lower-need ZIPs.

area typical 10%MARINE CORPS HERITAGE FOUNDATION: $100 → 7%GOOD SHEPHERD COMMUNITY CARE: $100 → 8%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

ME
NH
MT
MN
MI
NY
MA
WY
PA
RI
CA
CO
NE
VA
MD
AZ
KS
TN
NC
SC
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.

96%of every dollar goes to organizations it has funded before.
$409k · 91 repeat orgs$19k to everyone else

Grantees it renews have grown median revenue +45% since the first grant, against +24% for those funded once.

91 repeat relationships: 62 still active in FY2025, 29 since wound down; 9 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

91
33

Total granted

$409k
$14k

Median revenue growth · since first grant

+45%
+24%

Still filing today

58%
39%

New vs renewed · share of each year

In FY2025, 93% of grant dollars renewed an existing relationship; $5k went to new ones.

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

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

’20’21’22’23’24’25
EnvironmentArts & CultureEducationAnimalsPublic BenefitRecreation & SportsOther
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

  • BOSTON BALLET INC
    6× · 2020–2025 · $45k · revenue +19%
  • Dana-Farber Cancer Institute Inc
    6× · 2020–2025 · $26k · revenue +95%
  • WT
    WILDLANDS TRUST INC
    5× · 2020–2025 · $19k · revenue +45%

Funded once

  • M4
    MASS 4-H FOUNDATION
    one grant, 2021 · $5k
  • TV
    TUFTS VETERINARY SCHOOL
    one grant, 2024 · $3k
  • DY
    DORCHESTER YOUTH HOCKEY INCgraduated
    one grant, 2021 · $1k · revenue +29%
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
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.

—
2
Native Plant Trust Inc

The organization's mission is to conserve and promote new england's native plants to ensure healthy, biologically diverse landscapes.

Environment
3
Conservation International Foundation

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

Environment
4
Rainforest Trust

Rainforest trust saves endangered wildlife and protects our planet by creating rainforest reserves through partnerships, community engagement, and donor support.

International
5
Boston Architectural College

The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.

—
6
National Fish and Wildlife Foundation

To sustain, restore, and enhance the nation's fish, wildlife, plants, and habitats.

Animals
7
The Wildlife Society

The wildlife society's mission is to inspire, empower, and enable wildlife professionals to sustain wildlife populations and habitats through science-based management and conservation.

Animals
8
Harvard Conservation Trust

To preserve the unique character and natural resources of harvard.

Environment
9
American Association for the Advancement of Science

Advance science, engineering, and innovation throughout the world for the benefit of all. the world's largest multidisciplinary scientific society and a leading publisher of cutting-edge research through its science family of journals,…

Science & Tech
10
American Museum of Natural History

The museum's mission statement is: "to discover, interpret, and disseminate - through scientific research and education - knowledge about human cultures, the natural world, and the universe."

Arts & Culture
11
Marine Biological Laboratory

The Marine Biological Laboratory (MBL) is a world-renowned center for biological discovery and training that is notably affiliated with more than 60 Nobel Prize winners. Research is conducted by full-time faculty as well as hundreds of the…

Science & Tech
12
Eastern National

Eastern national promotes the public's understanding and support of america's national parks and other public trust partners by providing quality educational experiences, products and services.

Recreation & Sports
How this is measured
The grantee most central to the portfolio’s shape is Wildlands Trust Inc; the most unlike its peers is Mansfield Police Association Foundation 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

77 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. 77 of the 136 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)
75/77
Grantees still filing
61/77
Grew since first funded

Where the money sits, by cause and then by grantee

BIDMC (BETH ISRAEL DEACONESS MEDICAL CENTER): $101,500 · OtherBIDMC (BETH ISRAEL DEACONESS MEDICAL CENTER)MASS GENERAL HOSPITAL: $24,000 · OtherMASS GENERAL HOSPITALMASS GENERAL BRIGHAM INCORPORATED: $24,000 · OtherMASS GENERAL BRIGHAM INCORPORATEDNEWTON-WELLESLEY HOSPITAL: $11,100 · Other+90 more: $91,450 · Other+90 moreNEW ENGLAND BAPTIST HOSPITAL: $37,500 · HealthNEW ENGLAND BAPT…Dana-Farber Cancer Institute Inc: $25,500 · HealthDana-Farber Canc…+1 more: $100 · HealthBOSTON BALLET INC: $45,260 · Arts & CultureBOSTON BALLET…+8 more: $4,500 · Arts & Culture+8 moreTrustees of Tufts College: $16,000 · EducationNOBLE AND GREENOUGH SCHOOL: $13,000 · EducationWHEATON COLLEGE: $2,500 · Education+4 more: $1,750 · EducationWILDLANDS TRUST INC: $19,000 · EnvironmentRUFFED GROUSE SOCIETY: $900 · Environment+14 more: $4,400 · EnvironmentNEW ENGLAND SKATING CLUB INC: $6,000 · Recreation & SportsDORCHESTER YOUTH HOCKEY INC: $1,000 · Recreation & SportsYOSEMITE FOUNDATION: $600 · Recreation & SportsSPECIAL OLYMPICS MASSACHUSETTS INC: $400 · Recreation & SportsAMERICAN BOXER CHARITABLE FOUNDATION: $2,500 · PhilanthropyCAPITAL RESEARCH CENTER: $400 · PhilanthropySwim Across America Inc: $100 · Philanthropy
Other$252,050Health$63,100Arts & Culture$49,760Education$33,250Environment$24,300Recreation & Sports$8,000Philanthropy$3,000

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 budgetBOSTON BALLET INC: $45,260 over 6y, 0.0% of budgetNEW ENGLAND BAPTIST HOSPITAL: $37,500 over 6y, 0.0% of budgetDana-Farber Cancer Institute Inc: $25,500 over 6y, 0.0% of budgetWILDLANDS TRUST INC: $19,000 over 5y, 0.2% of budgetTrustees of Tufts College: $16,000 over 2y, 0.0% of budgetNOBLE AND GREENOUGH SCHOOL: $13,000 over 6y, 0.0% of budgetNEW ENGLAND SKATING CLUB INC: $6,000 over 2y, 2.6% of budgetTHE NATURE CONSERVANCY: $4,200 over 4y, 0.0% of budgetAMERICAN BOXER CHARITABLE FOUNDATION: $2,500 over 5y, 0.5% of budgetWHEATON COLLEGE: $2,500 over 6y, 0.0% of budgetWEST SIDE BENEVOLENT CIRCLE INC: $1,500 over 6y, 0.1% of budgetJUDICIAL WATCH INC: $1,000 over 6y, 0.0% of budgetWalpole Little League Inc: $1,000 over 5y, 0.2% of budgetDORCHESTER YOUTH HOCKEY INC: $1,000 over 1y, 0.3% of budgetRUFFED GROUSE SOCIETY: $900 over 4y, 0.0% of budgetAtlantic Salmon Federation (US) Inc: $800 over 6y, 0.0% of budgetTROUT UNLIMITED INC: $800 over 6y, 0.0% of budgetSMITHSONIAN INSTITUTION: $800 over 6y, 0.0% of budgetGREATER BOSTON FOOD BANK INC: $800 over 4y, 0.0% of budgetThe United States Holocaust Memorial Museum: $700 over 6y, 0.0% of budgetAMERICAN RIVERS INC: $600 over 6y, 0.0% of budgetAmerican Battlefield Trust: $600 over 6y, 0.0% of budgetNATIONAL PARK FOUNDATION: $600 over 6y, 0.0% of budgetOCEAN CONSERVANCY: $600 over 6y, 0.0% of budgetNATIONAL GEOGRAPHIC SOCIETY: $600 over 6y, 0.0% of budgetSIMON WIESENTHAL CENTER INC: $600 over 6y, 0.0% of budgetYOSEMITE FOUNDATION: $600 over 6y, 0.0% of budgetNATIONAL TRUST FOR HISTORIC PRESERVATION IN THE UNITED STATES: $600 over 6y, 0.0% of budgetHILLSDALE COLLEGE: $600 over 5y, 0.0% of budgetWOODS HOLE OCEANOGRAPHIC INSTITUTION: $600 over 6y, 0.0% of budgetTHE HERITAGE FOUNDATION: $600 over 6y, 0.0% of budgetNATIONAL MARINE LIFE CENTER INC: $600 over 6y, 0.0% of budgetYELLOWSTONE FOREVER: $500 over 5y, 0.0% of budgetLeadership Institute: $500 over 5y, 0.0% of budgetNATIONAL WILDLIFE FEDERATION: $500 over 5y, 0.0% of budgetTHE CLAREMONT INSTITUTE FOR THE STUDY OF STATESMANSHIP & POLITICAL PHILOSOPHY: $500 over 5y, 0.0% of budgetNATIONAL PARKS CONSERVATION ASSOCIATION: $500 over 5y, 0.0% of budgetRAINFOREST ALLIANCE INC: $500 over 5y, 0.0% of budgetHarvard-Radcliffe Gilbert & Sullivan Players: $500 over 1y, 2.9% of budgetThe Cousteau Society Inc: $500 over 5y, 0.0% of budgetCATO INSTITUTE: $500 over 5y, 0.0% of budgetCO2 COALITION: $450 over 3y, 0.0% of budgetSPECIAL OLYMPICS MASSACHUSETTS INC: $400 over 4y, 0.0% of budgetPROJECT VERITAS: $400 over 3y, 0.0% of budgetTRUSTEES OF BOSTON UNIVERSITY: $400 over 2y, 0.0% of budgetCAPITAL RESEARCH CENTER: $400 over 4y, 0.0% of budgetUSA Shooting Inc: $400 over 4y, 0.0% of budgetDISABLED VETERANS NATIONAL FOUNDATION: $300 over 2y, 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.

  • Who funds BOSTON BALLET INC ↗
  • Who funds NEW ENGLAND BAPTIST HOSPITAL ↗
  • Who funds Dana-Farber Cancer Institute Inc ↗
  • Who funds WILDLANDS TRUST INC ↗
  • Who funds Trustees of Tufts College ↗
  • Who funds NOBLE AND GREENOUGH SCHOOL ↗
  • Who funds NEW ENGLAND SKATING CLUB INC ↗
  • Who funds THE NATURE CONSERVANCY ↗
  • Who funds AMERICAN BOXER CHARITABLE FOUNDATION ↗
  • Who funds WHEATON COLLEGE ↗
  • Who funds WEST SIDE BENEVOLENT CIRCLE INC ↗
  • Who funds JUDICIAL WATCH INC ↗
  • Who funds Walpole Little League Inc ↗
  • Who funds DORCHESTER YOUTH HOCKEY INC ↗
  • Who funds RUFFED GROUSE SOCIETY ↗
  • Who funds Atlantic Salmon Federation (US) Inc ↗
  • Who funds TROUT UNLIMITED INC ↗
  • Who funds SMITHSONIAN INSTITUTION ↗
  • Who funds GREATER BOSTON FOOD BANK INC ↗
  • Who funds The United States Holocaust Memorial Museum ↗

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.

Combined Jewish Philanthropies of Greater Boston IncMA12.6× affinity4 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Combined Jewish Philanthropies of Greater Boston Inc · Analog Devices Foundation · Eastern Bank Foundation · The Pfizer Foundation Inc · National Philanthropic Trust · The Bank of America Charitable Foundation Inc · American Endowment Foundation · Vanguard Charitable Endowment Program · Morgan Stanley Global Impact Funding Trust Inc · Network for Good · Donor Advised Charitable Giving Inc · American Online Giving 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 Joseph M Hamilburg Foundation funds: left to right is the share of its income from government, bottom to top the share from Joseph M Hamilburg Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 90%0%1%3%5%funder's share of their income ↑0%25%50%75%100%share of the org’s income from government →median 12%
  • Vietnam Veterans Workshop Inc Dba New England Center and Home for Veterans: 66% of income from government
  • Woods Hole Oceanographic Institution: 63% of income from government
  • Greater Boston Food Bank Inc: 22% of income from government
  • National Marine Life Center Inc: 16% of income from government
  • Hospice of the Good Shepherd Inc: 13% of income from government
  • Trustees of Tufts College: 13% of income from government
  • Trustees of Boston University: 12% of income from government
  • New England Aquarium Corporation: 12% of income from government
  • Dana-Farber Cancer Institute Inc: 7% of income from government
  • Wildlands Trust Inc: 5% of income from government
  • Atlantic White Shark Conservancy Inc: 5% of income from government
  • Special Olympics Massachusetts Inc: 1% of income from government
  • New England Baptist Hospital: 1% of income from government
  • Boston Ballet Inc: 0% of income from government
  • Wheaton College: 0% of income from government
  • Pan-Massachusetts Challenge Inc: 0% of income from government
no gov moneyreceives it· size = income
9get no government money at all
6report government grants on their 990 we could not trace to a source (not plotted)
2rely 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.

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 136 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

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