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Connecticut · Private foundation

Halvorsen 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.

$35M
Granted FY2025(still arriving)
33
Grants FY2025
18
Organizations funded FY2024
22%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$20,000
Largest grant, FY2025
$20,000,000
Organizations funded a year
1 to 28
FY2019 to FY2024
States reached, FY2025
8
Total assets, FY2025
$365M
Applications
Preselected organizations only
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 22% of the organizations Halvorsen Family Foundation funded were first-time grantees, receiving 96% of its grant dollars.

New vs renewed · share of each year

In FY2024, 4% of grant dollars renewed an existing relationship; $20M went to new ones.

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

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

’20’21’22’23’24
Arts & CultureEducationEnvironmentHealthAnimalsRecreation & 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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2025still arriving32$34M16%
FY202418$21M22%
FY202324$15M17%
FY202228$13M75%
FY20219$9.3M78%
FY20207$7.1M86%
FY20191$7.5Mn/a
98% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2018 to 2025.

Education$58MHealth$18MPhilanthropy$14MArts & Culture$12MSocial Science$2.2MRecreation & Sports$1.8MAnimals$1.1MInternational$156kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

ME
VT
MN
NY
MA
PA
CT
CA
UT

Top grantees

Largest recipients by total granted, FY2019 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 28 grantees

What it could do for these grantees

Plus 20 recipients with no EIN on record ($73M), not named here.

Where it is load-bearing

Halvorsen Family Foundation supplied at least a quarter of the budget for 2 of its grantees at some point. The chart plots its 27 largest grantees; load-bearing ones sit top left.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetSterling and Francine Clark Art Institute: $13,374,000 over 6y, 51% of budgetWilliams College: $13,213,743 over 7y, 1.6% of budgetThe Hospital for Special Surgery Fund Inc: $2,210,000 over 4y, 6.8% of budgetGreen Mountain Valley School Inc: $1,605,000 over 3y, 13% of budgetThe Rockefeller University: $1,275,000 over 5y, 0.1% of budgetWildlife Conservation Society: $1,000,000 over 5y, 0.1% of budgetTeachers College Columbia University: $300,000 over 3y, 0.0% of budgetNational Nordic Foundation: $145,000 over 4y, 15% of budgetMuseum of Modern Art: $100,000 over 2y, 0.0% of budgetGreens Ledge Light Preservation Society Inc: $85,000 over 3y, 5.9% of budgetConnecticut Audubon Society Inc: $75,000 over 2y, 0.7% of budgetThe Maritime Aquarium at Norwalk Inc: $60,000 over 3y, 0.2% of budgetDarien Police Association Inc: $55,000 over 3y, 4.8% of budgetMassachusetts Museum of Contemporary Art Foundation Inc: $50,000 over 3y, 0.1% of budgetNew England Nordic Ski Association Inc: $50,000 over 1y, 7.2% of budgetFriends of Fondation de France Inc: $50,000 over 1y, 1.6% of budgetDarien Community Association Inc: $45,000 over 3y, 2.0% of budgetStowe Volunteer Firefighters Inc: $45,000 over 3y, 70% of budgetDarien EMS Post 53 Inc: $45,000 over 3y, 3.0% of budgetWestport River Watershed Alliance Inc: $30,000 over 3y, 1.5% of budgetDarien Library Inc: $30,000 over 3y, 0.2% of budgetStowe Rescue Squad Inc: $30,000 over 3y, 13% of budgetStowe Land Trust: $20,000 over 2y, 0.5% of budgetDarien Nature Center Inc: $15,000 over 3y, 0.5% of budgetTeach for America Inc: $10,000 over 1y, 0.0% of budgetStowe Swimmers Foundation Ltd D/B/A the Swimming Hole: $6,000 over 3y, 0.2% of budgetCatamount Trail Association: $6,000 over 3y, 0.5% 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 27.

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.

The Rogers Family FoundationCT15.7× affinity5 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Rogers Family Foundation · The Meredith and Whitney George Family Foundation Inc · Ibm International Foundation · The Goodnow Fund · The Darien Foundation Inc · 522 Foundation Inc · The Roxe Foundation · The Wiggins Foundation Inc · The Weil Foundation · Viking Global Foundation Inc · Fairfield County's Community Foundation Inc · The Goldman Sachs Charitable Gift Fund

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 Halvorsen Family Foundation with peer funders

About Halvorsen Family Foundation

How much does Halvorsen Family Foundation give?
Halvorsen Family Foundation reported 33 grants totaling $34,502,270 in its FY2025 IRS filing. It funded between 1 and 28 organizations a year over FY2019 to FY2024.
What does Halvorsen Family Foundation fund?
By grant dollars over FY2019 to FY2025, its largest causes are Education (54%), Health (16%), Philanthropy (13%).
Who are Halvorsen Family Foundation's largest grantees?
By total granted over FY2019 to FY2025: Sterling and Francine Clark Art Institute ($13M), Williams College ($13M), The Hospital for Special Surgery Fund Inc ($2.2M).
Does Halvorsen Family Foundation fund new organizations?
In FY2024, 22% of the organizations it funded were first-time grantees.
Does Halvorsen Family 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 Halvorsen Family Foundation?
Its strongest co-funders, measured against what their size predicts, include The Rogers Family Foundation, The Meredith and Whitney George Family Foundation Inc, Ibm International Foundation.
Where is Halvorsen Family Foundation based?
Halvorsen Family Foundation is based in CT.

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 49 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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