Private foundation · EIN 26-0752500 · Downers Grove, Illinois · Philanthropy & grantmaking

Shirley and Bill Koloseike Foundation

Should you approach them?

Don't send a cold proposal. The foundation reports that it only gives to preselected organizations; an introduction through a current grantee or board member is the realistic route.

From the 2025 Form 990-PF: 2 grants paid, $300K total, median $150K. 50% of grants stayed in Illinois.

Accepts applications
No
per 990-PF Part XV
Grants paid, 2025
2
$300K
Median grant
$150K
Stays in IL
50%
of grants
Deadline
—
Assets
$8.5M

Grants paid in 2025

2 grants, all shown · from Form 990-PF Part XV

RecipientPurposeAmount
University of ChicagoChicago, ILUnrestricted charitable grant$200K
Breakthrough T1d (formerly Jdrf)New York, NYUnrestricted charitable grant$100K

By state: Illinois 1 · New York 1

About this foundation

Shirley and Bill Koloseike Foundation is a private grantmaking foundation in Downers Grove, Illinois, administered in care of Richard Dessimoz, tax-exempt since 2008. Private foundations must pay out roughly 5% of their assets each year, mostly as grants to 501(c)(3) public charities.

All filings on ProPublica

Does Shirley and Bill Koloseike Foundation accept grant applications?

No. On its 2025 Form 990-PF the foundation checked that it only makes contributions to preselected organizations. Look for an introduction through a current grantee.

How much does Shirley and Bill Koloseike Foundation give each year?

In tax year 2025 it paid $300K across 2 grants, a median of $150K.

Where does Shirley and Bill Koloseike Foundation give?

Illinois (1 grants), New York (1 grants), per its latest filing.

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