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Form 990-PFTax year 2025EIN 84-4212818

The Thornton Foundation Delaware

A private foundation in San Marino, CA. Its return for tax year 2025 reports $4 million paid in grants, listed in an attachment that is not in the e-file.

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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

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

  • Tax year 2025

    $4,027,000

    Grants listed
    In an attachment
    Assets, end of year
    $92,964,069

  • Tax year 2024

    $3,711,000

    Grants listed
    In an attachment
    Assets, end of year
    $92,268,794

  • Tax year 2023

    $3,596,000

    Grants listed
    In an attachment
    Assets, end of year
    $63,228,959

  • Tax year 2022

    $3,774,000

    Grants listed
    In an attachment
    Assets, end of year
    $64,414,051

  • Tax year 2021

    $2,851,700

    Grants listed
    In an attachment
    Assets, end of year
    $64,032,692

  • Tax year 2020

    $0

    Grants listed
    0
    Assets, end of year
    $52,866,669

Grants paid in 2025

Grants listed in an attachment (not in the e-file)

As listed on the return.

  1. This return lists its grants in an attachment that is not in the IRS e-file: $4 million in all.

Officers, directors and trustees

5 people as filed

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

  • Charles B ThorntonCHAIRMAN OF THE BOARD Hours 0Pay $0
  • Geneva H ThorntonSECRETARY Hours 0Pay $0
  • Robert L ZuberCFO Hours 0Pay $0
  • Bette P CookSECRETARY Hours 0Pay $0
  • John MeyersPRESIDENT Hours 40Pay $116,667

The return

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