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California · Private foundation

Arntz 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.

$531k
Granted FY2023
27
Itemized grants FY2023
27
Organizations funded FY2023
59%
First-time grantees FY2023
Read the full brief
Itemized, FY2023
$404k
The rest is grants the schedule does not break out
Median grant, FY2023
$5,000
Largest grant, FY2023
$50,000
Organizations funded a year
21 to 27
FY2022 to FY2023
States reached, FY2023
5
Total assets, FY2023
$9.7M
Applications
Preselected organizations only
Per its most recent filing; check its own site

How open it is to new grantees

In FY2023, 59% of the organizations Arntz Family Foundation funded were first-time grantees, receiving 22% of its grant dollars.

The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY202327$404k59%
FY202221$416kn/a
91% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2024.

Philanthropy$1.8MEnvironment$721kAnimals$41kHealth$10kYouth Development$10kArts & Culture$10kFood & Nutrition$6kEducation$5kOther$0

Top grantees

Largest recipients by total granted, FY2022 to FY2023, and the share of each one’s budget the grants supplied at peak.

GranteeTotal grantedYearsShare of their budget
Goodpower Education Fund Inc$105,00021%
The Climate Center$100,00022%
Earthjustice$100,00020%
Environment California Research and Policy Center$95,00027%
Seacology$75,00021%
Sierra Nevada Alliance$65,00023%
Greenbelt Alliancepeople for Open Space$40,00012%
Sonoma Ecology Center$21,50021%
Lifehouse Inc$10,08820%
Kqed Inc$7,50010%
Show all 26 grantees

What it could do for these grantees

Plus 11 recipients with no EIN on record ($175k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Arntz Family Foundation supplied at peak.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetGoodpower Education Fund Inc: $105,000 over 2y, 0.7% of budgetThe Climate Center: $100,000 over 2y, 2.1% of budgetEarthjustice: $100,000 over 2y, 0.0% of budgetEnvironment California Research and Policy Center: $95,000 over 2y, 7.3% of budgetSeacology: $75,000 over 2y, 1.2% of budgetSierra Nevada Alliance: $65,000 over 2y, 2.6% of budgetGreenbelt Alliancepeople for Open Space: $40,000 over 1y, 2.0% of budgetSonoma Ecology Center: $21,500 over 2y, 0.6% of budgetLifehouse Inc: $10,088 over 2y, 0.0% of budgetKqed Inc: $7,500 over 1y, 0.0% of budgetMaui Food Bank Inc: $5,181 over 1y, 0.1% of budgetSociety of St Vincent de Paul Archdiocesan Council of Indianapolis Inc: $2,500 over 1y, 0.0% of budgetSoroptimist International of Novato Inc: $2,000 over 2y, 1.0% of budgetHomeless Action Sonoma Inc: $2,000 over 2y, 0.2% of budgetNorth Bay Childrens Center Inc: $1,500 over 1y, 0.0% of budgetSierra Institute for Community & Environment: $1,000 over 1y, 0.0% of budgetGrand Circle Foundation Inc: $1,000 over 1y, 0.0% of budgetResonate Workshops: $1,000 over 1y, 0.2% of budgetSonoma Earth School: $1,000 over 1y, 0.4% of budgetCenter for Agricultural Resilience: $1,000 over 1y, 0.7% of budgetMarin Agricultural Land Trust: $500 over 1y, 0.0% of budgetSonoma Valley Mentoring Alliance: $500 over 1y, 0.1% of budgetNational Tropical Botanical Garden: $500 over 1y, 0.0% of budgetCalifornia Waterfowl Association: $500 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 24.

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.

Marin Community FoundationCA23.9× affinity10 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Marin Community Foundation · Sonoma County Community Foundation · The San Francisco Foundation · McNabb Foundation · Resources Legacy Fund · Impactassetsinc · Patagoniaorg · Women Giving as One Inc · Leonard & Beryl Buck Foundation · The Joseph and Vera Long Foundation · Bothin Foundation · Morgan Stanley Global Impact Funding Trust 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.

Compare Arntz Family Foundation with peer funders

Warm introductions · Powered by PlinthPlus

How do I get to Arntz Family Foundation?

Find your warmest path to Arntz Family 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 Arntz Family Foundation

How much does Arntz Family Foundation give?
Arntz Family Foundation reported 27 itemized grants totaling $404,396, out of $531,397 in total grant expense reported on the return in its FY2023 IRS filing. It funded between 21 and 27 organizations a year over FY2022 to FY2023.
What does Arntz Family Foundation fund?
By grant dollars over FY2022 to FY2023, its largest causes are Philanthropy (52%), Environment (21%), Animals (1%).
Who are Arntz Family Foundation's largest grantees?
By total granted over FY2022 to FY2023: Goodpower Education Fund Inc ($105k), The Climate Center ($100k), Earthjustice ($100k).
Does Arntz Family Foundation fund new organizations?
In FY2023, 59% of the organizations it funded were first-time grantees.
Does Arntz 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 Arntz Family Foundation?
Its strongest co-funders, measured against what their size predicts, include Marin Community Foundation, Sonoma County Community Foundation, The San Francisco Foundation.
Where is Arntz Family Foundation based?
Arntz Family Foundation is based in CA.

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 37 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 2023, released 2023. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Possibly out of date. A more recent filing (FY2025) is on record and reports $843k of grant expense with no grantee named in the published copy. A private foundation itemizes every grant it makes, so a return carrying none has filed its list as an attachment that the public copy does not include. The figures above are therefore from FY2023, the most recent year this funder’s grantee list reached the public record.

Source object · view filing

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