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Form 990-PFTax year 2025EIN 13-7270729

Alexander W Casdin Foundation

A private foundation in New York, NY. Its return for tax year 2025 lists 0 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

    $0

    Grants listed
    0
    Assets, end of year
    $0

  • Tax year 2024

    $20,000

    Grants listed
    1
    Assets, end of year
    $80

  • Tax year 2023

    $159,000

    Grants listed
    3
    Assets, end of year
    $20,136

  • Tax year 2022

    $11,000

    Grants listed
    2
    Assets, end of year
    $3,355

  • Tax year 2021

    $0

    Grants listed
    0
    Assets, end of year
    $4,193

  • Tax year 2020

    $33,700

    Grants listed
    1
    Assets, end of year
    $4,243

  • Tax year 2019

    $79,950

    Grants listed
    16
    Assets, end of year
    $20,483

  • Tax year 2018

    $88,326

    Grants listed
    11
    Assets, end of year
    $18,257

Grants paid in 2025

0 grants, largest first

As listed on the return.

Officers, directors and trustees

3 people as filed

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

  • Alexander CasdinDIRECTOR Hours 0.25Pay $0
  • Susan Block CasdinDIRECTOR Hours 0.25Pay $0
  • Nicholas EisenmanDIRECTOR Hours 0.25Pay $0

The return

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