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Form 990-PFTax year 2025EIN 13-6279580

Ariowitsch Family Foundation

A private foundation in Mill Valley, CA. Its return for tax year 2025 lists 16 grants and $60,000 paid in grants.

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

Tax year 2025 (period ending Dec 31, 2025), 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

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

  • Tax year 2025

    $60,000

    Grants listed
    16
    Assets, end of year
    $404,016

  • Tax year 2024

    $54,000

    Grants listed
    15
    Assets, end of year
    $439,390

  • Tax year 2023

    $50,000

    Grants listed
    8
    Assets, end of year
    $477,483

  • Tax year 2022

    $45,000

    Grants listed
    8
    Assets, end of year
    $470,626

  • Tax year 2021

    $56,000

    Grants listed
    10
    Assets, end of year
    $461,986

  • Tax year 2020

    $50,000

    Grants listed
    9
    Assets, end of year
    $450,419

Grants paid in 2025

16 grants, largest first

As listed on the return. Grants to individuals show as “Individual”, with purpose and amount only.

  1. Individual

    Conservation

    $30,000
  2. Individual

    Scholarship

    $5,000
  3. Marin Mountessori SchoolCorte Madera, CA

    Education

    $5,000
  4. Headlands Center for ArtsSausalito, CA

    Education

    $5,000
  5. The Community FoundationBoulder, CO

    Arts education, environment, humanitarian

    $3,000
  6. UC Berkeley FoundationBerkeley, CA

    Education

    $2,000
  7. Union of Concerned ScientistsCambridge, MA

    Education

    $1,500
  8. Environmental Defense FundNew York, NY

    Environmental

    $1,500
  9. Yellowstone to YukonBozeman, MT

    Education

    $1,500
  10. Washington UniversitySt Louis, MO

    Education

    $1,000
  11. The Living DesertPalm Desert, CA

    Education

    $1,000
  12. Individual

    Environmental

    $1,000
  13. Individual

    Environmental

    $1,000
  14. Individual

    Environmental

    $500
  15. Rainforest Action NetworkSan Francisco, CA

    Environment

    $500
  16. Island ConservationSanta Cruz, CA

    Environment

    $500

Where the money goes

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

  1. Arts and culture1 grant $5,00032% of the total
  2. Environment5 grants $5,00032% of the total
  3. Philanthropy and grantmaking1 grant $3,00019% of the total
  4. International aid1 grant $1,50010% of the total
  5. Education1 grant $1,0006% of the total

By State

Grants to organizations with a US address, latest year.

  1. California7 grants $15,500
  2. Colorado1 grant $3,000
  3. Massachusetts1 grant $1,500
  4. Montana1 grant $1,500
  5. Missouri1 grant $1,000

Officers, directors and trustees

4 people as filed

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

  • Tim AriowitschPresident & CEO Hours 1Pay $0
  • Tanya AriowitschVice President Hours 1Pay $0
  • Melinda AriowitschTreasurer Hours 1Pay $0
  • Ethan AriowitschSecretary Hours 1Pay $0

The return

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