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Plinth

· Private foundation

Marci and Martin Karplus Family 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.

$7k
Granted FY2025still arriving
13
Grants FY2025still arriving
6
States reached
$500
Largest
01What you fundRead
02The needRead
03Your edgeRead
04Your fieldRead
01What you fund
01100% classified

What you funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2022–2025.

Education$196kHealth$58kInternational$49kCrime & Legal$26kArts & Culture$20kPhilanthropy$16kCivil Rights$13kPublic Safety & Disaster$9kOther$0
02FY2025 · 13 grants

Where the money goes

Your grants by size, and where they go.

$500
Median grant
6
States reached
$1.1M
Total assets
Largest grants
RecipientAmount
FORWARD IMPACT$500
BIDWELL TRAINING CENTER INC$500
CAMBRIDGE HOMES$500
AMERICAN INDIAN COLLEGE FUND$500
PROJECT HOPE THE PEOPLE TO PEOPLE HEALTH FOUNDATIO$500
WIKIMEDIA FOUNDATION INC$500
SPAULDING REHAB HOSPITAL CORP$500
COMMUNITY COOKS INC$500
EAST COAST ASSISTANCE DOGS INC$500
HELPING HANDS MONKEY HELPERS FOR THE DISABLED INC$500
DOLORES C HUERTA FOUNDATION$500
HOPEWELL INC$500
BRIDGES HOMEWARD INC$500
02The need
03

Do your dollars go where the need is?

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

Your US giving — 90% of grant dollars ($365k). The need read here covers only this US portion; the 10% that went abroad ($41k) is mapped below.

show:

Your human-services grants (FY22–25, $7k) land where the poverty rate runs at 10%, against an area that typically sits at 11%. 51% of those dollars go to grantees based in above-average-need neighborhoods. Your grants spread fairly evenly across need levels.

area typical 11%ROSENBERG FUND FOR CHILDREN INC: $750 → 12%HOPEWELL INC: $750 → 7%ROSENBERG FUND FOR CHILDREN INC: $750 → 12%HOPEWELL INC: $750 → 7%HOPEWELL INC: $500 → 7%BRIDGES HOMEWARD INC: $500 → 8%BRIDGES HOMEWARD INC: $500 → 8%APOPO US INC: $2k → 14%BRIDGES HOMEWARD INC: $350 → 8%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount

Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.

Which US states your grants reach

MN
WI
NY
MA
IN
PA
CT
CA
CO
MO
VA
MD
DC

Beyond the US — 10% of all-years giving ($41k)

1 country, by the recipient’s country on the filing.

grant dollars sentlessmore
France$41k · 1 grant

US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving. International giving is mapped by the recipient’s country from the same 990filings; comparable need data isn’t available at that grain.

04

Where the work is directed

The same grants, placed two ways — where each recipient sits, and where its stated purpose earmarks the money.

About 28% of Marci and Martin Karplus Family Foundation’s grant dollars are earmarked, by their stated purpose, for a different county than the recipient’s own address — money that lands at a nonprofit in one place but is meant to do its work in another.

Marci and Martin Karplus Family Foundationlessmore of its giving
Placed by recipient address · 16% directed abroad (not shown)

Recipient view: each grant at its grantee’s ZIP, mapped to a county. Directed view: each grant at the county its stated purpose names, falling back to the recipient’s county when the purpose names no place; US grants only. A county shows only if it carries the top 95% of that view’s dollars. Purposes are read from the foundation’s own 990 grant descriptions.

03Your edge
repeat funding

Who you back again

Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.

58%of every dollar goes to organizations you’ve funded before.
$144k · 35 repeat orgs$106k to everyone else

35 repeat relationships — 13 still active in FY2025, 22 since wound down.

How the two cohorts compare

Re-uppedFunded once

Organizations

35
15

Total granted

$144k
$106k

Median revenue growth · since first grant

+11%
+29%

Still filing today

91%
73%

New vs renewed · share of each year

In FY2025, 100% of grant dollars renewed an existing relationship; $0 went to new ones.

50%100%’22’23’24’25
RenewedFirst-time

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

’22’23’24’25
InternationalEducationArts & CultureHealthHuman ServicesCrime & LegalOther

First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). 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

  • UU
    UNRWA USA NATIONAL COMMITTEE INC
    3× · 2022–2024 · $14k · revenue +840%
  • NE
    NEW ENGLAND INNOCENCE PROJECT
    3× · 2022–2024 · $14k · revenue +89%
  • PA
    POLITICAL ASYLUMIMMIGRATION REPRESENTATION PROJECT INC
    3× · 2022–2024 · $10k · revenue +50%

Funded once

  • S
    STIMULTANIA
    one grant, 2023 · $41k
  • CP
    CAMBRIDGE PUBLIC LIBRARY FOUNDATION INCgraduated
    one grant, 2022 · $25k · revenue +117%
  • FS
    FISCAL SPONSORSHIP ALLIES INCgraduated
    one grant, 2022 · $10k · revenue ×17

Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.

04Your field

The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.

1
Boston Architectural College

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

—
2
Massachusetts Higher Education Assistance Corporation

The organization's primary exempt purpose is to provide access to and conduct activities in furtherance of higher education.

—
3
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
4
International Aids Vaccine Initiative Inc

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

International
5
The Common Application Inc

The common application is a not-for-profit membership organization of over 1,100 colleges and universities across the globe committed to access, equity, and integrity in the college admission process. every year, over 1.5 million students…

Education
6
University of New Haven

The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…

Education
7
Commonwealth Care Alliance Inc

Commonwealth care alliance, inc.'s mission is to improve the health and well-being of people with significant needs by innovating, coordinating and providing the highest quality, individualized care.

Health
8
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
9
The Trustees of Princeton University

Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…

Education
10
Partnersglobal

Partnersglobal (partners) works through a global network to support local leaders and create partnerships that transform conflict, strengthen democratic institutions, and achieve sustainable development.

International
11
Npr Foundation

The npr foundation ("foundation") is organized and operated exclusively for the benefit of its sole supported organization, national public radio, inc. ("npr inc."). the foundation supports npr inc. through various activities such as…

—
12
Ceres Inc

Ceres is a nonprofit advocacy organization working to accelerate the transition to a cleaner, more just, and resilient world. through education and research, we make the business case for action on the most pressing sustainability…

Environment

For reference, the grantee most central to the portfolio’s shape is Hopewell Inc and the most unlike its peers is The Cambridge Homes. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.

For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.

← shrinkinggrowing →↓ leaning in → pulling backsteadyPolicy Research and AdvocacyImmigrant Worker SupportPregnancy Support ServicesFaith-Based Liberal Arts Co…Food Banks and PantriesAnimal Rescue and ShelterJewish Community Organizati…Addiction Recovery ServicesCommunity Arts CentersPublic Library OperationsCommunity Foundations
the sector your giving your giving is ahead of the sector the sector’s ahead of you· dot size = how much the theme matters to each side
Ordered by the change in your giving — leaning in on top, pulling back at the bottom. The bar between the two dots is how out of step you are with the sector. Hover any row for detail.

Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.

Your grantees are a median of 37 years old; the field is 17. You back the established end — and your money leans older still.

THE FIELDby orgYOUR GRANTEESby number20%0%<5yr14%7%5–10yr20%18%10–20yr19%18%20–35yr14%33%35–55yr14%24%55yr+
THE FIELDby orgYOUR MONEYby value20%0%<5yr14%4%5–10yr20%13%10–20yr19%14%20–35yr14%15%35–55yr14%53%55yr+

The field is 20% startups (under 5 years old) — 0% of your grantees by number, and just 0% of your money.

Closures · last 5 years

The orgs you fund almost never close — 0.0% lost their exemption, against 11% of the field you don’t fund.

orgs you fund
0.0%0/47
the rest of the field
11%
4,714/42,311

Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.

05the grantee network

47 grantees tracked through their own filings, 2017–2025.

Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.

Counted here: distinct organizations you funded across 2017–2025, not grant rows in a single year — so this will not match the grant count on the cover. 47 of the 53 grantees resolved in that span have returns of their own we could reconcile; the rest are funded organizations whose filings we could not track year by year.

0
Load-bearing (≥25% of a budget)
8
Early backer (in before they grew)
46/47
Grantees still filing
34/47
Grew since you first funded

Where your money sits — by cause, then by grantee

President and Fellows of Harvard College — $150,000 · EducationPresident and Fellows of Harvard CollegeCAMBRIDGE PUBLIC LIBRARY FOUNDATION INC — $25,000 · EducationCAMBRIDGE PUBLIC LIBRARY FOUNDATION INCUniversity of St Thomas — $6,500 · Education+4 more — $11,800 · Education+4 moreSTIMULTANIA — $41,434 · OtherSTIMULTANIAPlanned Parenthood Global Inc — $3,500 · OtherTIDES FOUNDATION — $5,500 · OtherTIDES FOUNDATION+23 more — $37,700 · Other+23 moreUNRWA USA NATIONAL COMMITTEE INC — $13,500 · InternationalUNRWA USA NATIO…HUMAN RIGHTS WATCH INC — $10,500 · InternationalHUMAN RIGHTS WA…WORLD CENTRAL KITCHEN INC — $8,500 · InternationalWORLD CENTRAL K…UNITED STATES FUND FOR UNICEF — $6,000 · InternationalUNITED STATES F…MEDECINS SANS FRONTIERES USA INC — $5,000 · InternationalMEDECINS SANS F…International Rescue Committee INC — $5,000 · InternationalInternational R…AMNESTY INTERNATIONAL OF THE USA INC — $3,900 · InternationalAMNESTY INTERNA…PROJECT HOPE - THE PEOPLE-TO-PEOPLE HEALTH FOUNDATION INC — $2,750 · InternationalNEW ENGLAND INNOCENCE PROJECT — $13,500 · Crime & LegalPOLITICAL ASYLUMIMMIGRATION REPRESENTATION PROJECT INC — $10,000 · Crime & LegalLAW FORWARD INC — $2,250 · Crime & LegalHUNTINGTON THEATRE CO INC — $10,000 · Arts & CultureWGBH Educational Foundation — $5,000 · Arts & CultureASSOCIATION OF AMERICAN VOICES — $2,450 · Arts & CultureFORWARD IMPACT — $2,000 · Arts & Culture+1 more — $500 · Arts & CultureCOALITION FOR HUMANE IMMIGRANT RIGHTS — $9,500 · Civil RightsACLU FOUNDATION OF MASSACHUSETTS INC — $3,000 · Civil RightsFISCAL SPONSORSHIP ALLIES INC — $10,000 · Community ImprovementDOLORES C HUERTA FOUNDATION — $1,850 · Community Improvement
Education$193,300Other$88,134International$55,150Crime & Legal$25,750Arts & Culture$19,950Civil Rights$12,500Community Improvement$11,850

Each org by its size and your share of it — top-left is where you’re load-bearing

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ your share of their budgetPresident and Fellows of Harvard College — $150,000 over 1y, 0.0% of budgetCAMBRIDGE PUBLIC LIBRARY FOUNDATION INC — $25,000 over 1y, 6.6% of budgetUNRWA USA NATIONAL COMMITTEE INC — $13,500 over 3y, 0.1% of budgetNEW ENGLAND INNOCENCE PROJECT — $13,500 over 3y, 0.2% of budgetHUMAN RIGHTS WATCH INC — $10,500 over 3y, 0.0% of budgetFISCAL SPONSORSHIP ALLIES INC — $10,000 over 1y, 0.2% of budgetHUNTINGTON THEATRE CO INC — $10,000 over 1y, 0.0% of budgetPOLITICAL ASYLUMIMMIGRATION REPRESENTATION PROJECT INC — $10,000 over 3y, 0.2% of budgetCOALITION FOR HUMANE IMMIGRANT RIGHTS — $9,500 over 3y, 0.0% of budgetWORLD CENTRAL KITCHEN INC — $8,500 over 3y, 0.0% of budgetUniversity of St Thomas — $6,500 over 3y, 0.0% of budgetUNITED STATES FUND FOR UNICEF — $6,000 over 3y, 0.0% of budgetTIDES FOUNDATION — $5,500 over 3y, 0.0% of budgetWGBH Educational Foundation — $5,000 over 3y, 0.0% of budgetMEDECINS SANS FRONTIERES USA INC — $5,000 over 2y, 0.0% of budgetInternational Rescue Committee INC — $5,000 over 2y, 0.0% of budgetCAMBRIDGE CENTER FOR ADULT EDUCATION — $5,000 over 2y, 0.1% of budgetAMNESTY INTERNATIONAL OF THE USA INC — $3,900 over 3y, 0.0% of budgetPlanned Parenthood Global Inc — $3,500 over 1y, 0.0% of budgetAMERICAN INDIAN COLLEGE FUND — $3,000 over 4y, 0.0% of budgetACLU FOUNDATION OF MASSACHUSETTS INC — $3,000 over 2y, 0.0% of budgetPROJECT HOPE - THE PEOPLE-TO-PEOPLE HEALTH FOUNDATION INC — $2,750 over 4y, 0.0% of budgetEAST COAST ASSISTANCE DOGS INC — $2,550 over 3y, 0.1% of budgetNational Alliance On Mental Illness-Cambridge — $2,500 over 1y, 6.9% of budgetNAMI National — $2,500 over 1y, 0.0% of budgetPLANNED PARENTHOOD LEAGUE OF MASSACHUSETTS INC — $2,500 over 1y, 0.0% of budgetENVISIONING ACCESS INC — $2,500 over 4y, 0.1% of budgetASSOCIATION OF AMERICAN VOICES — $2,450 over 3y, 0.0% of budgetBIDWELL TRAINING CENTER INC — $2,450 over 4y, 0.0% of budgetLAW FORWARD INC — $2,250 over 3y, 0.0% of budgetAPOPO US INC — $2,000 over 1y, 0.2% of budgetHOPEWELL INC — $2,000 over 3y, 0.0% of budgetFORWARD IMPACT — $2,000 over 4y, 0.0% of budgetPARTNERS FOR YOUTH WITH DISABILITIES INC — $2,000 over 1y, 0.1% of budgetDOLORES C HUERTA FOUNDATION — $1,850 over 4y, 0.0% of budgetTHE CAMBRIDGE HOMES — $1,700 over 4y, 0.0% of budgetROSIE'S PLACE INC — $1,600 over 3y, 0.0% of budgetRIVERSIDE COMMUNITY CARE INC — $1,500 over 2y, 0.0% of budgetROSENBERG FUND FOR CHILDREN INC — $1,500 over 2y, 0.1% of budgetCOMMUNITY COOKS INC — $1,450 over 4y, 0.1% of budgetBRIDGES HOMEWARD INC — $1,350 over 3y, 0.0% of budgetWIKIMEDIA FOUNDATION INC — $1,250 over 4y, 0.0% of budgetCAMBRIDGE COMMUNITY FOUNDATION — $950 over 3y, 0.0% of budgetMALTA CONFERENCES FOUNDATION — $700 over 2y, 0.8% of budgetFRIENDS OF THE JEWISH MUSEUM OF VIENNA INC — $500 over 1y, 1.2% of budgetNATIONAL ACADEMY OF SCIENCES — $300 over 1y, 0.0% of budget
Go grantee by grantee — a decade per org, and how each moved after you funded them

A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.

The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.

Boston Foundation IncEastern Bank Foundati…Cambridge Savings Cha…The Louis FoundationStevenson Family Char…Alchemy FoundationBushrod H Campbell & …The Cabot Family Char…Cambridge Community F…Eastern Cambridge Fou…The New England Patri…Cummings Foundation G…
Boston Foundation IncMA25.3× affinity12 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Boston Foundation Inc · Eastern Bank Foundation · Cambridge Savings Charitable Foundation Inc · The Louis Foundation · Stevenson Family Charitable Trust · Alchemy Foundation · Bushrod H Campbell & Adah F Hall Charity Fund · The Cabot Family Charitable Trust · Cambridge Community Foundation · Eastern Cambridge Foundation · The New England Patriots Charitable Foundation Inc · Cummings Foundation Grants Inc (Fka Oneworld Boston Inc)

Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.

Government reliance of your grantees

Every dot is one organization Marci and Martin Karplus Family Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal, a single department, or state — and drag the year to watch it move.

2024
’20’21’22’23’24’25
no gov · 70%1%3%6%10%your share of their income ↑0%25%50%75%100%share of the org’s income from government →median 7%
  • Hopewell Inc — 83% of income from government
  • Bridges Homeward Inc — 77% of income from government
  • Riverside Community Care Inc — 58% of income from government
  • New England Innocence Project — 12% of income from government
  • President and Fellows of Harvard College — 7% of income from government
  • Huntington Theatre Co Inc — 4% of income from government
  • Planned Parenthood League of Massachusetts Inc — 3% of income from government
  • Wgbh Educational Foundation — 1% of income from government
  • Rosie's Place Inc — 0% of income from government
no gov moneyreceives it· size = income
7get no government money at all
10report government grants on their 990 we could not trace to a source (not plotted)
3rely on government for over half their income
typical government reliance, FY20–25

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 your grant caused the public funding. Coverage is precision-first — a floor, not 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 12–24 months.

On method. Every financial figure here is read directly from IRS e-file XML — your own 990/990-PF and the multi-year returns of the 53 grantees we resolved across every year we hold, several hundred filings in all (a different count from the grant rows on the cover, which are one fiscal year)— each linked to its source. Grantee achievements and outcomes are each organization’s own program-service reporting (Form 990, Part III); we read these as association with sustained funding — the foundation is one of several forces — suppress low-confidence name matches rather than guess, and say so where a figure rests on a single grant or filing. Not everything on this page is a filed figure, and the difference matters. Filed is what you reported on your 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. How we build these →

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

Source object · view filing

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