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Form 990-PFTax year 2025EIN 36-4323606

Koroluk Foundation

A private foundation in Naperville, IL. Its return for tax year 2025 lists 1 grant and $265,000 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

    $265,000

    Grants listed
    1
    Assets, end of year
    $5,243,795

  • Tax year 2024

    $235,000

    Grants listed
    1
    Assets, end of year
    $5,243,278

  • Tax year 2023

    $245,000

    Grants listed
    1
    Assets, end of year
    $4,105,680

  • Tax year 2022

    $211,000

    Grants listed
    1
    Assets, end of year
    $4,144,662

  • Tax year 2021

    $218,000

    Grants listed
    1
    Assets, end of year
    $4,201,602

  • Tax year 2020

    $220,000

    Grants listed
    1
    Assets, end of year
    $4,321,268

  • Tax year 2019

    $225,000

    Grants listed
    1
    Assets, end of year
    $4,373,249

  • Tax year 2018

    $225,000

    Grants listed
    In an attachment
    Assets, end of year
    $4,427,931

Grants paid in 2025

1 grant, largest first

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

  1. Individual

    Church or charity

    $265,000

Officers, directors and trustees

4 people as filed

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

  • Del Marie KorolukTreasurer Hours 1Pay $0
  • Theodore KorolukPresident Hours 2Pay $0
  • Aleksandr KalininDirector Hours 0Pay $0
  • Theodora HeihnSecretary Hours 0Pay $0

The return

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