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Massachusetts · 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 FY2025(still arriving)
9
Grants FY2025
6
Organizations funded FY2024
0%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$200
Largest grant, FY2025
$6,000
Organizations funded a year
6 to 20
FY2018 to FY2024
States reached, FY2025
2
Total assets, FY2025
$129k
Applications
Preselected organizations only
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 0% of the organizations Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation funded were first-time grantees, receiving 0% of its grant dollars.

New vs renewed · share of each year

In FY2024, 100% of grant dollars renewed an existing relationship; $0 went to new ones.

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

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

’18’19’20’21’22’23’24
Arts & CultureEducationEnvironmentHousing & ShelterPublic BenefitEmploymentOther
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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2025still arriving9$12k33%
FY20246$7k0%
FY202310$11k20%
FY202220$15k45%
FY202117$15k35%
FY202011$22k18%
FY201915$29k40%
FY201812$17k33%
97% 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

Top grantees

Largest recipients by total granted, FY2017 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 32 grantees

What it could do for these grantees

Plus 15 recipients with no EIN on record ($59k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation supplied at peak.

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their 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

Tap a dot to name the grantee.

How this is measured
Share of budget is the funder’s grant in a year over the grantee’s total revenue that year, at its highest across the years we hold; revenue is from all sources. Only grantees confirmed against their own filings, whose grants do not exceed their revenue, are plotted: the largest 28.

Nonprofits that may fit its grantmaking

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 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.

Compare Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation with peer funders

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.

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

How much does Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation give?
Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation reported 9 grants totaling $12,356 in its FY2025 IRS filing. It funded between 6 and 20 organizations a year over FY2018 to FY2024.
What does Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation fund?
By grant dollars over FY2017 to FY2025, its largest causes are Education (38%), Religion (19%), Health (19%).
Who are Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation's largest grantees?
By total granted over FY2017 to FY2025: Museum of Science ($27k), Franciscan Hospital for Children ($22k), Next for Autism Inc ($10k).
Does Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation fund new organizations?
In FY2024, 0% of the organizations it funded were first-time grantees.
Does Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation accept unsolicited applications?
Its most recent filing reports that it funds preselected organizations and does not take unsolicited requests. Check the foundation's own site before ruling it out.
Which funders back the same organizations as Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation?
Its strongest co-funders, measured against what their size predicts, include Boston Foundation Inc, Eastern Bank Foundation, Yawkey Foundation II.
Where is Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation based?
Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation is based in MA.

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

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