The Arrillaga Foundation concentrates large, strategic gifts primarily in education, community safety/emergency services, and medical research, with a strong Silicon Valley / Bay Area orientation but some international education support. They favor capital projects (new buildings, dorms, campaigns) and endowed positions or research funds at leading universities and hospitals, while also funding emergency response capacity and leadership development programs. The foundation gives both transformational multi-million dollar commitments and targeted multi-year support to repeat grantees.
A $10 million capital campaign gift to the Woodside Fire Foundation sets the tone for Arrillaga Foundation’s recent giving: large, project-specific commitments that often underwrite buildings, facilities, or named funds at institutions with long operating horizons. The foundation also made a $5 million grant to Iolani School for a new student center and a $3.5 million commitment to the San Mateo County Sheriff’s Office Foundation for construction of the new sheriff’s office, showing a strong preference for tangible infrastructure. Across its recent grants, Arrillaga Foundation moves between education, emergency services, and health research. It backed Menlo College’s dormitory construction project with $3.478 million and Brown University with a $2 million associate deanship for financial advising, while also supporting pediatric and clinical research through Lucile Packard Foundation for Children’s Health and Harvard T.H. Chan School of Public Health. The grant list also includes support for The Teak Fellowship, Cambodian Children’s Fund, and local safety-related projects in California and Hawaii. The pattern is one of concentrated, high-dollar investments paired with targeted support for ongoing programs and endowed roles.
In education, Arrillaga Foundation has funded both facilities and student-facing programs. It gave $5 million to Iolani School for a new student center and $3.478 million to Menlo College for dormitory construction, then later supported Brown University with $500,000 for paid student learning opportunities. In health and clinical research, the foundation funded Lucile Packard Foundation for Children’s Health twice: $1 million for the PANS epidemiological research fund and $500,000 for Dr. Jenny Frankovich’s PANS infection research. It also gave $350,000 to President and Fellows of Harvard College for the Harvard T.H. Chan School of Public Health food allergy study and research. Its public safety giving includes a $10 million grant to the Woodside Fire Foundation for the Fighting Chance capital campaign and a $3.5 million grant to the San Mateo County Sheriff’s Office Foundation for construction of the new sheriff’s office. For youth development, it supported The Teak Fellowship with $1 million for the Marc E. Becker Endowment for Leadership and Professional Development.
$9.5M
$50.9M
$28.7M
$9.8M
Most grants fall between $10K and $1M, with a median of $15K.
25th Percentile
$10K
Median
$15K
75th Percentile
$1M
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Concentrated, high-dollar grants (several gifts in the $1M–$10M range) with repeat funding to select institutional grantees; emphasis on capital/ endowment-style investments and programmatic research funding rather than many small community grants.
Notable grantees: Woodside Fire Foundation, Iolani School, Menlo College, Lucile Packard Foundation for Children’s Health, Stanford University
Arrillaga Foundation’s recent grants show a wide size range: p25 is $10,000, the median grant is $15,252, and p75 is $1,000,000. That spread reflects a mix of many smaller awards and a smaller number of very large commitments. The data also shows repeat support to the same organizations across different years, including Lucile Packard Foundation for Children’s Health, Stanford University, Brown University, The Teak Fellowship, and Silicon Valley Social Venture Fund - Sv2. The foundation is a private foundation, not a fund for individuals, and it does not make program-related investments.
Giving is heavily concentrated in California, which accounts for 85% of grants to recipients in the HQ state. Still, the top state by grant count is Rhode Island, reflecting recurring support there as well. Recent recipient cities include Woodside, Redwood City, Atherton, Palo Alto, Stanford, Los Angeles, and Santa Monica, showing a strong Bay Area and Southern California footprint. Outside California, grants also went to Providence, Honolulu, New York, Boston, Philadelphia, Alexandria, Marfa, and Lahaina. All recent grants in the data were to U.S. recipients.
Recent grants center on capital projects and named funds in education, public safety infrastructure, and health research. Examples include a $5 million student center grant to Iolani School, a $3.5 million construction grant to the San Mateo County Sheriff’s Office Foundation, and research support to Lucile Packard Foundation for Children’s Health and Harvard T.H. Chan School of Public Health.
Yes. The recent grant list includes multiple awards to the same organizations in different years, including Lucile Packard Foundation for Children’s Health, Stanford University, Brown University, The Teak Fellowship, and Silicon Valley Social Venture Fund - Sv2.
The distribution is highly mixed: p25 is $10,000, the median is $15,252, and p75 is $1,000,000. That means many grants are modest in size, while a smaller set reaches seven figures.
California receives the majority of grants by recipient location, with 85% of grants going to recipients in the HQ state. By count, Rhode Island is the top state for giving, and recent recipient cities also include Honolulu, Providence, Boston, New York, Philadelphia, and Marfa.
The foundation funds schools, universities, fire and sheriff’s organizations, health research institutions, and nonprofit programs. Recent recipients include Iolani School, Menlo College, Brown University, Lucile Packard Foundation for Children’s Health, Harvard University, the Woodside Fire Foundation, and The Teak Fellowship.
2025
Source: IRS Form 990-PF, fiscal year 2025.
Most recent grants reported to the IRS.
| Recipient | Location | Amount | Year | Purpose |
|---|---|---|---|---|
| SAN MATEO COUNTY SHERIFF'S OFFICE FOUNDATION | REDWOOD CITY, CA | $3,500,000 | 2025 | CONSTRUCTION OF THE NEW SAN MATEO COUNTY SHERIFF'S OFFICE |
| THE TEAK FELLOWSHIP | NEW YORK, NY | $1,000,000 | 2025 | THE MARC E. BECKER ENDOWMENT FOR LEADERSHIP AND PROFESSIONAL DEVELOPMENT |
| BROWN UNIVERSITY | PROVIDENCE, RI | $500,000 | 2025 | PAID STUDENT LEARNING OPPORTUNITIES |
| LUCILE PACKARD FOUNDATION FOR CHILDREN'S HEALTH | PALO ALTO, CA | $500,000 | 2025 | DR. JENNY FRANKOVICH'S PANS INFECTION RESEARCH |
| CAMBODIAN CHILDREN'S FUND | SANTA MONICA, CA | $400,000 | 2025 | EDUCATIONAL PROGRAMMING |
| PRESIDENT AND FELLOWS OF HARVARD COLLEGE | BOSTON, MA | $350,000 | 2025 | HARVARD T.H. CHAN SCHOOL OF PUBLIC HEALTH - FOOD ALLERGY STUDY & RESEARCH |
| CAF AMERICA - MCA AUSTRALIA MEHRETU EXHIBITION | ALEXANDRIA, VA | $264,000 | 2025 | GENERAL SUPPORT |
| THE UCLA FOUNDATION | LOS ANGELES, CA | $250,000 | 2025 | THE RAPE TREATMENT CENTER - GENERAL SUPPORT |
| WEST MAUI IMPROVEMENT FOUNDATION | LAHAINA, HI | $250,000 | 2025 | OLOWALU FIRESTATION FUNDRAISER |
| READY TO SUCCEED | SANTA MONICA, CA | $200,000 | 2025 | READY TO SUCCEED ALUMNI AND EARLY CAREER ENGAGEMENT PROGRAM |
| VISION TO LEARN | LOS ANGELES, CA | $200,000 | 2025 | GENERAL SUPPORT |
| SILICON VALLEY SOCIAL VENTURE FUND - SV2 | REDWOOD CITY, CA | $150,000 | 2025 | GENERAL OPERATING |
| QUESTBRIDGE | PALO ALTO, CA | $150,000 | 2025 | FEASIBILITY STUDY PROGRAM |
| THE TEAK FELLOWSHIP | NEW YORK, NY | $100,000 | 2025 | CATS AND SWIM PROGRAMS |
| DOWNTOWN WOMEN'S CENTER | LOS ANGELES, CA | $100,000 | 2025 | GENERAL SUPPORT |
| BALLROOM MARFA | MARFA, TX | $100,000 | 2025 | GENERAL SUPPORT |
| STORYCORPS | BROOKLYN, NY | $100,000 | 2025 | GENERAL SUPPORT |
| MACCABI USA INC | PHILADELPHIA, PA | $100,000 | 2025 | FINANCIAL AID ENDOWMENT |
| ISRAEL TENNIS CENTERS FOUNDATION INC | NEW YORK, NY | $100,000 | 2025 | GENERAL SUPPORT |
| LOYOLA MARYMOUNT UNIVERSITY | LOS ANGELES, CA | $100,000 | 2025 | LOYOLA PROJECT FOR THE INNOCENT PROGRAM |
| SILICON VALLEY SOCIAL VENTURE FUND - SV2 | REDWOOD CITY, CA | $85,000 | 2025 | GENERAL OPERATING |
| THE PENINSULA BRIDGE PROGRAM | SAN MATEO, CA | $50,000 | 2025 | GENERAL SUPPORT |
| CEDARS-SINAI MEDICAL CENTER | LOS ANGELES, CA | $50,000 | 2025 | RESEARCH IN GUT MICROBIOME |
| PACIFIC AMERICAN FOUNDATION | KAILUA, HI | $50,000 | 2025 | NALU STUDIES PROGRAM |
| BOSTON CHILDREN'S HOSPITAL | BOSTON, MA | $50,000 | 2025 | RESEARCH FOR GUT BRAIN INTERACTION |
| GIGI'S PLAYHOUSE NYC | NEW YORK, NY | $50,000 | 2025 | GENERAL SUPPORT |
| HAWAI'I FOODBANK | HONOLULU, HI | $50,000 | 2025 | KEIKI SCHOOL PANTRY PROGRAM |
| UNIVERSITY OF WASHINGTON FOUNDATION | SEATTLE, WA | $50,000 | 2025 | UW MEDICINE FAMILY PLANNING FUND |
| HARVARD-WESTLAKE SCHOOL | STUDIO CITY, CA | $50,000 | 2025 | FINANCIAL AID PROGRAM |
| AL WOOTEN JR YOUTH CENTER | LOS ANGELES, CA | $50,000 | 2025 | GENERAL SUPPORT |
| ASSOCIATION TO BENEFIT CHILDREN | NEW YORK, NY | $50,000 | 2025 | GENERAL SUPPORT |
| KAPI'OLANI HEALTH FOUNDATION | HONOLULU, HI | $50,000 | 2025 | ABBIE VARA PEDIATRIC SERVICES FUND |
| BALLROOM MARFA | MARFA, TX | $47,000 | 2025 | GENERAL SUPPORT |
| RONALD MCDONALD HOUSE CHARITIES OF HAWAII | HONOLULU, HI | $35,000 | 2025 | GENERAL SUPPORT |
| CEREBRAL PALSY SOCCER INC | IRVINGTON, NY | $25,000 | 2025 | GENERAL SUPPORT |
| FOOD ALLERGY RESEARCH & EDUCATION | MCLEAN, VA | $25,000 | 2025 | FOOD ALLERGY RESEARCH |
| THE JOHN THOMAS DYE SCHOOL | LOS ANGELES, CA | $25,000 | 2025 | FINANCIAL ASSISTANCE PROGRAM |
| DETERMINED TO SUCCEED | SANTA MONICA, CA | $25,000 | 2025 | GENERAL SUPPORT |
| LEGAL OUTREACH INC | LONG ISLAND CITY, NY | $25,000 | 2025 | GENERAL SUPPORT |
| SAN FRANCISCO GENERAL HOSPITAL FOUNDATION | SAN FRANCISCO, CA | $25,000 | 2025 | GENERAL OPERATING |
| WORLD CONNECT INC | NEW YORK, NY | $20,000 | 2025 | GENERAL SUPPORT |
| BROOKLYN DEBATE LEAGUE | BROOKLYN, NY | $20,000 | 2025 | GENERAL SUPPORT |
| HAWAII PERFORMING ARTS COMPANY | HONOLULU, HI | $15,000 | 2025 | MVT SHOW SPONSORSHIP - PARADE |
| ACHIEVE TAHOE | TRUCKEE, CA | $15,000 | 2025 | GENERAL SUPPORT |
| ACCESSURF HAWAII | HONOLULU, HI | $15,000 | 2025 | GENERAL SUPPORT |
| KIDS & ART FOUNDATION | BURLINGAME, CA | $15,000 | 2025 | LPCH ARTIST IN RESIDENCE PROGRAM |
| PALO ALTO WEEKLY HOLIDAY FUND (EMBARCADERO MEDIA FOUNDATION) | PALO ALTO, CA | $10,000 | 2025 | GENERAL SUPPORT |
| UC SANTA BARBARA FOUNDATION | SANTA BARBARA, CA | $10,000 | 2025 | THE TED DEIXLER MEMORIAL FUND |
| EDUCATION PIONEERS INC | BOSTON, MA | $10,000 | 2025 | GENERAL SUPPORT |
| CAMINAR | SAN MATEO, CA | $10,000 | 2025 | GENERAL SUPPORT |
SAN MATEO COUNTY SHERIFF'S OFFICE FOUNDATION
$3,500,000CONSTRUCTION OF THE NEW SAN MATEO COUNTY SHERIFF'S OFFICE
THE MARC E. BECKER ENDOWMENT FOR LEADERSHIP AND PROFESSIONAL DEVELOPMENT
BROWN UNIVERSITY
$500,000PAID STUDENT LEARNING OPPORTUNITIES
DR. JENNY FRANKOVICH'S PANS INFECTION RESEARCH
PRESIDENT AND FELLOWS OF HARVARD COLLEGE
$350,000HARVARD T.H. CHAN SCHOOL OF PUBLIC HEALTH - FOOD ALLERGY STUDY & RESEARCH
CAF AMERICA - MCA AUSTRALIA MEHRETU EXHIBITION
$264,000GENERAL SUPPORT
READY TO SUCCEED ALUMNI AND EARLY CAREER ENGAGEMENT PROGRAM
BALLROOM MARFA
$100,000GENERAL SUPPORT
SILICON VALLEY SOCIAL VENTURE FUND - SV2
$85,000GENERAL OPERATING
BOSTON CHILDREN'S HOSPITAL
$50,000RESEARCH FOR GUT BRAIN INTERACTION
GIGI'S PLAYHOUSE NYC
$50,000GENERAL SUPPORT
AL WOOTEN JR YOUTH CENTER
$50,000GENERAL SUPPORT
BALLROOM MARFA
$47,000GENERAL SUPPORT
CEREBRAL PALSY SOCCER INC
$25,000GENERAL SUPPORT
BROOKLYN DEBATE LEAGUE
$20,000GENERAL SUPPORT
HAWAII PERFORMING ARTS COMPANY
$15,000MVT SHOW SPONSORSHIP - PARADE
ACCESSURF HAWAII
$15,000GENERAL SUPPORT
PALO ALTO WEEKLY HOLIDAY FUND (EMBARCADERO MEDIA FOUNDATION)
$10,000GENERAL SUPPORT