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Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation at a glance

· Private foundation

Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff 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.

$12k
Granted FY2025still arriving
9
Grants FY2025still arriving
2
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, FY2017 to 2025.

Education$83kReligion$42kHealth$41kScience & Tech$27kInternational$14kArts & Culture$4kEnvironment$2kHuman Services$2kOther$0
02FY2025 · 9 grants

Where the money goes

Grants by size, and the largest recipients.

$200
Median grant
2
States reached
$129k
Total assets
Largest grants
RecipientAmount
MUSEUM OF SCIENCE$6,000
NEXT FOR AUTISM$3,000
TWO TEN INTERNATIONAL FOOTWEAR FOUNDATION$1,500
FRANCISCAN HOSPITAL FOR CHILDREN$1,000
THE WINDSOR SCHOOL$200
Individual grant recipient$200
FRICK COLLECTION NEW YORK$156
THE MORGAN LIBRARY AND MUSEUM$150
MUSEUM OF FINE ARTS$150
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 (FY18–18, $180) land where the poverty rate runs at 8%, against an area that typically sits at 8%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 8%THE PRICE CENTER: $180 → 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.
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.

91%of every dollar goes to organizations it has funded before.
$129k · 22 repeat orgs$12k to everyone else

Grantees it renews have grown median revenue +37% since the first grant, against +31% for those funded once.

22 repeat relationships: 6 still active in FY2025, 16 since wound down; 3 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

22
22

Total granted

$129k
$12k

Median revenue growth · since first grant

+37%
+31%

Still filing today

77%
55%

New vs renewed · share of each year

In FY2025, 96% of grant dollars renewed an existing relationship; $506 went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

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

’17’18’19’20’21’22’23’24’25
EducationArts & CultureHealthAnimalsEnvironmentHousing & ShelterOther
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

  • Franciscan Hospital for Children
    7× · 2017–2025 · $22k · revenue +68%
  • Trustees of Tufts College
    7× · 2017–2024 · $2k · revenue +50%
  • BA
    BRIMMER AND MAY SCHOOL
    4× · 2017–2021 · $2k · revenue +56%

Funded once

  • NORTHEAST ARC INC
    one grant, 2019 · $5k · revenue -67%
  • MS
    MASSACHUSETTS SOCIETY FOR THE PREVENTION OF CRUELTY TO CHILDREN
    one grant, 2017 · $1k · revenue -6%
  • TB
    THE BOSTON COLLEGIATE CHARTER SCHOOL
    one grant, 2019 · $1k
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
Boston Architectural College

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

—
2
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
3
Trustees of Dartmouth College

Dartmouth College educates the most promising students and prepares them for a lifetime of learning and of responsible leadership, through a faculty dedicated to teaching and the creation of knowledge.

Education
4
Trustees of Boston University

Organization's mission: boston university is an international, comprehensive, private research university, committed to educating students to be reflective, resourceful individuals ready to live, adapt, and lead in an interconnected world.…

—
5
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
6
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
7
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
8
Western New England University

Western new england university, a comprehensive private institution with a tradition of excellence in teaching and scholarship and a commitment to service, awards undergraduate, master's, and doctoral degrees in various departments from…

Education
9
President and Fellows of Harvard College

Undergraduate, graduate, and professional education and research across a broad array of academic domains.

Education
10
Dickinson College

Dickinson college provides a useful, innovative and interdisciplinary education in the liberal arts and sciences to prepare students to lead rich and fulfilling lives of engaged global citizenship

Education
11
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
12
Trustees of Boston College

Mission strengthened by more than a century and a half of dedication to academic excellence, boston college commits itself to the highest standards of teaching and research in undergraduate, graduate and professional programs and to the…

Education
How this is measured
The grantee most central to the portfolio’s shape is New England Aquarium Corporation; the most unlike its peers is Earth Creative. 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

31 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. 31 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)
3
Early backer (in before they grew)
31/31
Grantees still filing
21/31
Grew since first funded

Where the money sits, by cause and then by grantee

BROWN UNIVERSITY: $75,000 · Community ImprovementBROWN UNIVERSITYTEMPLE BETH AVODAH: $41,450 · OtherTEMPLE BETH AVODAHTWO TEN INTERNATIONAL FOOTWEAR FOUNDATION: $14,000 · OtherTWO TEN INTERNATIONAL FOOTWEAR FOUN…NORTHEAST ARC INC: $5,000 · OtherNORTHEAST ARC INC+23 more: $7,536 · Other+23 moreFranciscan Hospital for Children: $22,200 · HealthFranciscan Hospit…NEXT FOR AUTISM INC: $10,200 · HealthNEXT FOR AUTISM I…Dana-Farber Cancer Institute Inc: $1,280 · Health+1 more: $150 · HealthMUSEUM OF SCIENCE: $26,500 · Arts & CultureMUSEUM OF SCIEN…MUSEUM OF FINE ARTS: $1,015 · Arts & CultureEARTH CREATIVE: $1,000 · Arts & CultureTHE ACADEMY OF AMERICAN POETS INC: $1,000 · Arts & Culture+3 more: $385 · Arts & CultureTrustees of Tufts College: $2,450 · EducationBRIMMER AND MAY SCHOOL: $1,950 · EducationTHE WINSOR SCHOOL: $1,150 · EducationPROPRIETORS OF THE BOSTON ATHENAEUM: $750 · EducationBIOBUILDER EDUCATIONAL FOUNDATION: $500 · EducationTENACRE COUNTRY DAY SCHOOL CORPORATION: $250 · Education+1 more: $150 · EducationMASSACHUSETTS SOCIETY FOR THE PREVENTION OF CRUELTY TO CHILDREN: $1,450 · Crime & LegalSUSTAINABLE SEATTLE: $1,000 · EnvironmentTHE TRUSTEES OF RESERVATIONS: $325 · Environment
Community Improvement$75,000Other$67,986Health$33,830Arts & Culture$29,900Education$7,200Crime & Legal$1,450Environment$1,325

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 budgetBROWN UNIVERSITY: $75,000 over 5y, 0.0% of budgetMUSEUM OF SCIENCE: $26,500 over 8y, 0.0% of budgetFranciscan Hospital for Children: $22,200 over 7y, 0.0% of budgetNEXT FOR AUTISM INC: $10,200 over 4y, 0.1% of budgetNORTHEAST ARC INC: $5,000 over 1y, 0.0% of budgetTrustees of Tufts College: $2,450 over 7y, 0.0% of budgetBRIMMER AND MAY SCHOOL: $1,950 over 4y, 0.0% of budgetMASSACHUSETTS SOCIETY FOR THE PREVENTION OF CRUELTY TO CHILDREN: $1,450 over 1y, 0.0% of budgetDana-Farber Cancer Institute Inc: $1,280 over 3y, 0.0% of budgetTHE WINSOR SCHOOL: $1,150 over 3y, 0.0% of budgetMUSEUM OF FINE ARTS: $1,015 over 7y, 0.0% of budgetTHE ACADEMY OF AMERICAN POETS INC: $1,000 over 4y, 0.0% of budgetWORLD AGAINST TOYS CAUSING HARM INC: $1,000 over 4y, 1.1% of budgetPAN-MASSACHUSETTS CHALLENGE INC: $1,000 over 4y, 0.0% of budgetSUSTAINABLE SEATTLE: $1,000 over 1y, 0.3% of budgetPROPRIETORS OF THE BOSTON ATHENAEUM: $750 over 2y, 0.0% of budgetBIOBUILDER EDUCATIONAL FOUNDATION: $500 over 2y, 0.1% of budgetTHE TRUSTEES OF RESERVATIONS: $325 over 2y, 0.0% of budgetCOMMONWEALTH ZOOLOGICAL CORPORATION D/B/A ZOO NEW ENGLAND: $325 over 2y, 0.0% of budgetNEW ENGLAND AQUARIUM CORPORATION: $310 over 2y, 0.0% of budgetFATHER BILL'S & MAINSPRING INC: $250 over 1y, 0.0% of budgetTENACRE COUNTRY DAY SCHOOL CORPORATION: $250 over 1y, 0.0% of budgetGRAYWOLF PRESS: $200 over 1y, 0.0% of budgetGROW ASSOCIATES INC: $200 over 1y, 0.0% of budgetBARRY L PRICE REHABILITATION CENTER INC: $180 over 1y, 0.0% of budgetThe Pierpont Morgan Library: $150 over 1y, 0.0% of budgetLINDEN PONDS INC: $100 over 1y, 0.0% of budgetTHE INSTITUTE OF CONTEMPORARY ART INC: $100 over 1y, 0.0% of budgetTHE THOREAU SOCIETY INC: $85 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.

Boston Foundation IncEastern Bank Foundati…Yawkey Foundation IICombined Jewish Phila…Bny Mellon Charitable…Fidelity FoundationGe Aerospace Foundati…American Endowment Fo…Morgan Stanley Global…Gs Donor Advised Phil…Jpmorgan Chase Founda…Vanguard Charitable E…
Boston Foundation IncMA15.7× affinity6 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 · Yawkey Foundation II · Combined Jewish Philanthropies of Greater Boston Inc · Bny Mellon Charitable Gift Fund · Fidelity Foundation · Ge Aerospace Foundation · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Jpmorgan Chase Foundation · Vanguard Charitable Endowment Program

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 Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation funds: left to right is the share of its income from government, bottom to top the share from Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation. 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 2%
  • Grow Associates Inc: 97% of income from government
  • Northeast Arc Inc: 73% of income from government
  • Father Bill's & Mainspring Inc: 24% of income from government
  • Trustees of Tufts College: 13% of income from government
  • New England Aquarium Corporation: 12% of income from government
  • Dana-Farber Cancer Institute Inc: 7% of income from government
  • The Trustees of Reservations: 2% of income from government
  • Commonwealth Zoological Corporation D/B/a Zoo New England: 2% of income from government
  • The Institute of Contemporary Art Inc: 1% of income from government
  • Linden Ponds Inc: 1% of income from government
  • Franciscan Hospital for Children: 0% of income from government
  • Proprietors of the Boston Athenaeum: 0% of income from government
  • Museum of Science: 0% of income from government
  • Museum of Fine Arts: 0% of income from government
  • Pan-Massachusetts Challenge Inc: 0% of income from government
no gov moneyreceives it· size = income
5get no government money at all
3report 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.
05Through Plinth

Warm introductions · Powered by PlinthPlus

How do I get to Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation?

Find your warmest path to Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff 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 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff’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