The Teton Range reflected in a lake in Grand Teton National Park, Wyoming
Foundation Lookup

Form 990-PFTax year 2025EIN 83-0332938

Nion Robert Thieriot Foundation

A private foundation in Elk Mountain, WY. Its return for tax year 2025 lists 8 grants and $862,000 paid in grants.

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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

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

  • Tax year 2025

    $862,000

    Grants listed
    8
    Assets, end of year
    $6,351,020

  • Tax year 2024

    $725,000

    Grants listed
    8
    Assets, end of year
    $6,554,504

  • Tax year 2023

    $610,000

    Grants listed
    8
    Assets, end of year
    $5,373,057

  • Tax year 2022

    $649,000

    Grants listed
    5
    Assets, end of year
    $4,603,302

  • Tax year 2021

    $618,000

    Grants listed
    5
    Assets, end of year
    $4,594,269

  • Tax year 2020

    $590,000

    Grants listed
    6
    Assets, end of year
    $5,221,151

  • Tax year 2019

    $510,000

    Grants listed
    5
    Assets, end of year
    $5,466,883

  • Tax year 2018

    $501,500

    Grants listed
    4
    Assets, end of year
    $5,402,078

Grants paid in 2025

8 grants, largest first

As listed on the return.

  1. GreenagersS Egremont, MA

    Donation

    $252,000
  2. Berkshire Natural Resources CouncilPittsfield, MA

    Donation

    $175,000
  3. New Marlborough Land TrustSouthfield, MA

    Donation

    $150,000
  4. Sonoma Land TrustSanta Rosa, CA

    Donation

    $130,000
  5. Massachusetts SPCABoston, MA

    Donation

    $50,000
  6. Monterey Preservation Land TrustMonterey, MA

    Donation

    $50,000
  7. The Nature ConservancyArlington, VA

    Donation

    $50,000
  8. Sturgeon's Mill Restoration ProjectSebastopol, CA

    Donation

    $5,000

Where the money goes

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

  1. Food and agriculture1 grant $252,00058% of the total
  2. Environment2 grants $180,00041% of the total
  3. Arts and culture1 grant $5,0001% of the total

By State

Grants to organizations with a US address, latest year.

  1. Massachusetts5 grants $677,000
  2. California3 grants $185,000

Officers, directors and trustees

2 people as filed

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

  • Peter E ThieriotTRUSTEE Hours 5Pay $74,737
  • Alice RichmondTRUSTEE Hours 5Pay $74,737

The return

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