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Form 990-PFTax year 2024EIN 94-2460896

Arrillaga Foundation

A private foundation in Palo Alto, CA. Its return for tax year 2024 lists 53 grants and $9.5 million paid in grants.

See which foundations fund work like yours Matching by cause, place and grant size

Tax year 2024 (period ending Dec 31, 2024), read from the IRS e-file on Nov 11, 2026. Returns reach the IRS 5 to 18 months after the year they describe.

How to apply

Preselected only

The return checks the box saying the foundation gives only to preselected organizations and does not accept unsolicited requests.

Assets and giving by year

7 returns on file
Grants paid by tax year. The latest year is in blue.

  • Tax year 2024

    $9,451,000

    Grants listed
    53
    Assets, end of year
    $50,859,228

  • Tax year 2023

    $8,415,503

    Grants listed
    12
    Assets, end of year
    $31,817,642

  • Tax year 2022

    $15,528,071

    Grants listed
    8
    Assets, end of year
    $38,007,483

  • Tax year 2021

    $10,126,000

    Grants listed
    12
    Assets, end of year
    $23,309,253

  • Tax year 2020

    $1,471,000

    Grants listed
    15
    Assets, end of year
    $26,465,581

  • Tax year 2019

    $727,200

    Grants listed
    9
    Assets, end of year
    $27,012,932

  • Tax year 2018

    $35,000

    Grants listed
    2
    Assets, end of year
    $26,442,333

Grants paid in 2024

53 grants, largest first

As listed on the return.

  1. San Mateo County Sheriff's Office FoundationRedwood City, CA

    Construction of the new san mateo county sheriff's office

    $3,500,000
  2. The Teak FellowshipNew York, NY

    The marc e. Becker endowment for leadership and professional development

    $1,000,000
  3. Brown UniversityProvidence, RI

    Paid student learning opportunities

    $500,000
  4. Lucile Packard Foundation for Children's HealthPalo Alto, CA

    DR. Jenny frankovich's pans infection research

    $500,000
  5. Cambodian Children's FundSanta Monica, CA

    Educational programming

    $400,000
  6. President and Fellows of Harvard CollegeBoston, MA

    Harvard T.H. Chan school of public health - food allergy study & research

    $350,000
  7. Caf America - McA Australia Mehretu ExhibitionAlexandria, VA

    General support

    $264,000
  8. West Maui Improvement FoundationLahaina, HI

    Olowalu firestation fundraiser

    $250,000
  9. The UCLA FoundationLos Angeles, CA

    The rape treatment center - general support

    $250,000
  10. Ready to SucceedLos Angeles, CA

    Ready to succeed alumni and early career engagement program

    $200,000
  11. Vision to LearnLos Angeles, CA

    General support

    $200,000
  12. Silicon Valley Social Venture Fund - SV2Redwood City, CA

    General operating

    $150,000
  13. QuestbridgePalo Alto, CA

    Feasibility study program

    $150,000
  14. The Teak FellowshipNew York, NY

    Cats and swim programs

    $100,000
  15. Downtown Women's CenterLos Angeles, CA

    General support

    $100,000
  16. Israel Tennis Centers Foundation IncNew York, NY

    General support

    $100,000
  17. Loyola Marymount UniversityLos Angeles, CA

    Loyola project for the innocent program

    $100,000
  18. Maccabi USA IncPhiladelphia, PA

    Financial aid endowment

    $100,000
  19. StorycorpsBrooklyn, NY

    General support

    $100,000
  20. Ballroom MarfaMarfa, TX

    General support

    $100,000
  21. Silicon Valley Social Venture Fund - SV2Redwood City, CA

    General operating

    $85,000
  22. Al Wooten Jr Youth CenterLos Angeles, CA

    General support

    $50,000
  23. Association to Benefit ChildrenNew York, NY

    General support

    $50,000
  24. Boston Children's HospitalBoston, MA

    Research for gut brain interaction

    $50,000
  25. Cedars-Sinai Medical CenterW Hollywood, CA

    Research in gut microbiome

    $50,000
  26. Gigi's Playhouse NYCNew York, NY

    General support

    $50,000
  27. Harvard-Westlake SchoolStudio City, CA

    Financial aid program

    $50,000
  28. Hawai'i FoodbankHonolulu, HI

    Keiki school pantry program

    $50,000
  29. Kapi'olani Health FoundationHonolulu, HI

    Abbie vara pediatric services fund

    $50,000
  30. Pacific American FoundationKailua, HI

    Nalu studies program

    $50,000
  31. The Peninsula Bridge ProgramSan Mateo, CA

    General support

    $50,000
  32. University of Washington FoundationSeattle, WA

    UW medicine family planning fund

    $50,000
  33. Ballroom MarfaMarfa, TX

    General support

    $47,000
  34. Ronald McDonald House Charities of HawaiiHonolulu, HI

    General support

    $35,000
  35. San Francisco General Hospital FoundationSan Francisco, CA

    General operating

    $25,000
  36. Cerebral Palsy Soccer IncIrvington, NY

    General support

    $25,000
  37. Determined to SucceedSanta Monica, CA

    General support

    $25,000
  38. Food Allergy Research & EducationMcLean, VA

    Food allergy research

    $25,000
  39. The John Thomas Dye SchoolLos Angeles, CA

    Financial assistance program

    $25,000
  40. Legal Outreach IncAstoria, NY

    General support

    $25,000
  41. Brooklyn Debate LeagueBrooklyn, NY

    General support

    $20,000
  42. World Connect IncNew York, NY

    General support

    $20,000
  43. Achieve TahoeTruckee, CA

    General support

    $15,000
  44. Accessurf HawaiiHonolulu, HI

    General support

    $15,000
  45. Hawaii Performing Arts CompanyHonolulu, HI

    MVT show sponsorship - parade

    $15,000
  46. Kids & Art FoundationBurlingame, CA

    LPCH artist in residence program

    $15,000
  47. Christmas Bureau of Palo AltoPalo Alto, CA

    General support

    $10,000
  48. A'ali'i MentoringHonolulu, HI

    General support

    $10,000
  49. Education Pioneers IncBoston, MA

    General support

    $10,000
  50. Co-Cathedral of St Theresa Church of the Child JesusHonolulu, HI

    Parish security fence project

    $10,000
  51. UC Santa Barbara FoundationSanta Barbara, CA

    The ted deixler memorial fund

    $10,000
  52. Palo Alto Weekly Holiday Fund (embarcadero Media Foundation)Palo Alto, CA

    General support

    $10,000
  53. CaminarSan Mateo, CA

    General support

    $10,000

Approved for future payment

1 grant

Approved in 2024 and not yet paid.

  1. Iolani SchoolHonolulu, HI

    Building new student center

    $5,000,000

Where the money goes

By cause: grants to organizations we matched to the IRS list of exempt organizations, by their category.

  1. Human services6 grants $4,765,00058% of the total
  2. Health7 grants $890,00011% of the total
  3. Education10 grants $865,00011% of the total
  4. Philanthropy and grantmaking3 grants $635,0008% of the total
  5. Community development1 grant $500,0006% of the total
  6. International aid3 grants $170,0002% of the total
  7. 5 other causes8 grants $375,0005% of the total

By State

Grants to organizations with a US address, latest year.

  1. California24 grants $5,980,000
  2. New York10 grants $1,490,000
  3. Rhode Island1 grant $500,000
  4. Hawaii9 grants $485,000
  5. Massachusetts3 grants $410,000
  6. Virginia2 grants $289,000
  7. Texas2 grants $147,000
  8. Pennsylvania1 grant $100,000
  9. Washington1 grant $50,000

Officers, directors and trustees

4 people as filed

As filed on the return, with average hours per week and pay from the foundation.

  • Laura Arrillaga-AndreessenCO-PRESIDENT Hours 5Pay $0
  • John Arrillaga JrCO-PRESIDENT Hours 5Pay $0
  • Marc AndreessenTREASURER Hours 0Pay $0
  • Justine Stamen ArrillagaSECRETARY Hours 5Pay $0

The return

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