Arrillaga Foundation
The Arrillaga Foundation is a private foundation based in Palo Alto, California. In 2024, it reported 53 grants totaling $9,451,000, supporting organizations working in areas including education, research, health, community services, and the arts.
Arrillaga Foundation at a glance
In short: Arrillaga Foundation gave $9.5M across 53 grants in 2024 (avg $178K), mostly in California. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $9,451,000
- +12.3% vs 2023
- Grants made (2024)
- 53
- +341.7% vs 2023
- Average grant
- $178,321
- -74.6% vs 2023
- Median grant
- $50,000
- Total assets
- $50,859,228
- +59.8% vs 2023
- Primary geography
- California (63% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026.
How to apply to Arrillaga Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: 2450 Watson Court, Palo Alto, CA 94303
Phone: (650) 618-7000
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Arrillaga Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
The largest 2024 recipient was San Mateo County Sheriff's Office Foundation ($3.5M). Together the top 10 received $7.3M.
Grant Size Distribution
100 grants across all recorded years
The most common grant size was under $50K: 53 grants of 100 (53%).
Geographic Focus
Where this funder awards grants
In 2024, California recipients received 63% of grant dollars, followed by New York at 16%, Rhode Island and Hawaii at 5% each, and Massachusetts at 4%. Examples include grants to organizations in California, New York, Rhode Island, Hawaii, and Massachusetts.
Grant Distribution by State
Share of 2024 grant dollars across all 53 itemized grants.
Cities
How Arrillaga Foundation gives
- Giving held roughly steady from 2021 to 2024 (−7%). Method
- In 2024 it paid out 664% of its IRS minimum distribution (the 5% rule). Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $1.5M (2020) to $15.5M (2022). In 2024 it made 53 grants totaling $9.5M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| San Mateo County Sheriff's Office Foundation Redwood City, CA | Construction of the new san Mateo county sheriff's office | $3,500,000 |
| The Teak Fellowship New York, NY | The marc e. Becker endowment for leadership and professional development | $1,000,000 |
| Brown University Providence, RI | Paid Student Learning Opportunities | $500,000 |
| Lucile Packard Foundation for Children's Health Palo Alto, CA | Dr. Jenny Frankovich's Pans Infection Research | $500,000 |
| Cambodian Children's Fund Santa Monica, CA | Educational Programming | $400,000 |
| President and Fellows of Harvard College Boston, MA | Harvard t.h. Chan school of public health - food allergy study & research | $350,000 |
| CAF America - MCA Australia Mehretu Exhibition Alexandria, VA | General Support | $264,000 |
| West Maui Improvement Foundation Lahaina, HI | Olowalu Firestation Fundraiser | $250,000 |
| The UCLA Foundation Los Angeles, CA | The Rape Treatment Center - General Support | $250,000 |
| Ready to Succeed Santa Monica, CA | Ready to succeed alumni and early career engagement program | $200,000 |
Ready to take the next step with Arrillaga Foundation?
Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2024 | $50,859,228 | $28,664,150 | $9,787,126 | $9,451,000 | 53 | $9,451,000 | $3,291,706 | $1,423,369 |
| 2023 | $31,817,642 | $2,288,053 | $3,457,392 | $8,415,503 | 12 | $8,415,503 | $1,053,163 | $1,584,853 |
| 2022 | $38,007,483 | $30,405,036 | $25,683,707 | $15,528,071 | 8 | $15,528,071 | $1,594,282 | $1,607,697 |
| 2021 | $23,309,253 | $4,018,845 | $10,343,267 | $10,126,000 | 12 | $10,126,000 | $4,370,551 | $1,481,926 |
| 2020 | $26,465,581 | $1,132,268 | $1,679,619 | $1,471,000 | 15 | — | $1,132,268 | $1,398,581 |
Under IRS private-foundation payout rules, Arrillaga Foundation reported a distributable amount of $1.4M for 2024 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement is provided. The 2024 grants show support for a range of organizations and purposes, including construction, educational programming, research, student learning opportunities, and general support. For example, Cambodian Children’s Fund describes its mission as providing education, family support, and community development in impoverished communities; Ready to Succeed says it prepares foster youth in college for professional careers; and Vision to Learn provides free eye exams and glasses to students and low-income communities. These are the grantees’ stated missions, not stated priorities of the foundation.
Grantmaking
In 2024, the foundation reported 53 grants totaling $9,451,000. Grants ranged from $10,000 to $3,500,000, with a median of $50,000.
The largest reported grants included $3,500,000 to San Mateo County Sheriff’s Office Foundation for construction of its new office; $1,000,000 to The Teak Fellowship for an endowment for leadership and professional development; $500,000 to Brown University for paid student learning opportunities; and $500,000 to Lucile Packard Foundation for Children’s Health for PANS infection research. Other notable grants included $400,000 to Cambodian Children’s Fund for educational programming, $350,000 to President and Fellows of Harvard College for a food allergy study and research, and $250,000 to West Maui Improvement Foundation for an Olowalu fire station fundraiser.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists Laura Arrillaga-Andreessen and John Arrillaga Jr. as co-presidents, Marc Andreessen as treasurer, and Justine Stamen Arrillaga as secretary.
Arrillaga Foundation is led by John Arrillaga Jr., Co-President since 2022 (on filings since 2020); none of the 4 officers listed in 2024 report compensation.
Officers on the 2024 filing
John Arrillaga Jr.
Co-President
Treasurer & Director → Co-President, 2022
On filings since 2020
5 hrs/week
No compensation reported
Laura Arrillaga-Andreessen
Co-President
Secretary & Director → Co-President, 2022
On filings since 2021
5 hrs/week
No compensation reported
Justine Stamen Arrillaga
Secretary
On filings since 2022
5 hrs/week
No compensation reported
Marc Andreessen
Treasurer
On filings since 2022
No compensation reported
Former officers (2)
- Former: John Arrillaga (2020–2021) — President & Director
- Former: Laura Arrillaga (2020) — Secretary & Director
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about Arrillaga Foundation
How much does Arrillaga Foundation give each year?
Arrillaga Foundation gave $9.5M across 53 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $8.4M across 12 grants.
What is Arrillaga Foundation's typical grant size?
Arrillaga Foundation's median grant in 2024 was $50,000, and its average grant was $178,321, across 53 grants on its 2024 IRS Form 990-PF.
Where does Arrillaga Foundation give grants?
Arrillaga Foundation gives mostly in California: 63% of the grant dollars itemized on its 2024 IRS Form 990-PF went to recipients there. The next largest states were New York (16%) and Rhode Island (5%). The most frequent recipient cities were Los Angeles, CA (7 grants), Honolulu, HI (7 grants), New York, NY (6 grants) and Palo Alto, CA (4 grants).
Does Arrillaga Foundation give general operating support?
Yes: 53% of Arrillaga Foundation's 2024 grants with a stated purpose (28 of 53) were for general or operating support, per its 2024 IRS Form 990-PF.
Who are Arrillaga Foundation's largest grantees?
Arrillaga Foundation's largest 2024 grantees include San Mateo County Sheriff's Office Foundation ($3,500,000), The Teak Fellowship ($1,100,000 across 2 grants) and Brown University ($500,000), according to its 2024 IRS Form 990-PF. Together they received 54% of its itemized 2024 grant dollars.
How large is Arrillaga Foundation?
Arrillaga Foundation reported $50.9M in total assets on its 2024 IRS Form 990-PF. It paid out $9.5M in qualifying distributions that year, against a required minimum of $1.4M (roughly 5% of its investment assets).
What does Arrillaga Foundation fund?
No mission statement is provided. The 2024 grants show support for a range of organizations and purposes, including construction, educational programming, research, student learning opportunities, and general support. See mission & focus areas ↑
How do I apply for a grant from Arrillaga Foundation?
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Arrillaga Foundation's EIN?
Arrillaga Foundation's EIN (Employer Identification Number) is 94-2460896. IRS Form 990 filing data is available on this page for 2020–2024.
Does Arrillaga Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
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Cite this profile
Grantable. (2026). Arrillaga Foundation funder profile. GrantGraph. Retrieved October 14, 2026, from https://grantable.co/funders/arrillaga-foundation-morg_049a36dc0f2c4a878925c8e9af692b73
BibTeX
@misc{grantable_942460896_2026,
author = {{Grantable}},
title = {{Arrillaga Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/arrillaga-foundation-morg_049a36dc0f2c4a878925c8e9af692b73},
note = {Accessed 2026-10-14. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from Arrillaga Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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