Katherine Wells MacMillan Foundation

Private foundation · EIN 41-2000877 · since 2001·Florida, United States·Updated 13 October 2026

At a glance

$5.7M
Annual giving, 2024 tax year
From the Form 990-PF filing
$35,000 to $3M
Grant range
From grants in the 990-PF filings
$1M
Typical grant (median)
6 grants in the latest filing
Invitation only
Unsolicited applications are not accepted

This funder does not accept unsolicited applications. The foundation chooses the organisations it funds itself.

Key takeaways

  • This Minneapolis-based private foundation states that it makes grants solely to other public charities qualified under section 501(c)(3), and its recipients include community foundations, United Way organisations, a community centre and a children's shelter, so a group that is not such a charity falls outside its stated activity.
  • It states that it does not accept unsolicited requests, so the sensible first step is to seek an introduction or invitation rather than send a cold proposal.
  • Its typical grants fall between $35,000 and $3,000,000, with a median of $500,000 and half its grants at $500,000 or less, so a modest request sized towards the lower end fits its record best.
  • No geographic focus is stated, though its grants have been mainly in the United States and Florida, which describes its pattern rather than a limit on who may apply.
  • About 48% of its grant dollars to organisations went to organisations it had also funded in earlier filings, so repeat support is a real pattern worth knowing about.

Overview

Katherine Wells MacMillan Foundation is a US private foundation based in Minneapolis, MN.

What they fund

Profile based on the foundation's IRS Form 990-PF filings (TY2024, TY2023, TY2022) only: no website or other web source for the foundation was found. Every statement is checked against the filings. Sources read on 7 October 2026.

Priority Areas

The Foundation's stated activity is grantmaking solely to other public charitable organisations qualified under section 501(c)(3). Its filings do not identify a subject-area programme: most recorded grants are described as unrestricted, and one grant is recorded for the Katherine Wells MacMillan Fund. The recipients include community foundations and United Way organisations, as well as a community centre and a children's shelter. The available record therefore describes charitable support across different kinds of public charity rather than a stated service field or a narrower applicant class.

Geographic Focus

No geographic focus is stated; the filings show grants mainly in the United States and Florida.

How to apply

The foundation states that it does not accept unsolicited requests.

Application success factors

  • Repeat giving: In its TY2024 filing, 48% of its grant dollars to organisations went to organisations it had also funded in its TY2022 or TY2023 filing.
  • Grant size: Across its TY2022, TY2023 and TY2024 filings, half of its 12 grants to organisations were $500,000 or less.

Where grants go

From grants to organisations in the foundation’s filings for tax years 2022–2024.

Grant dollars by state

Oklahoma34%
New Hampshire34%
Florida33%
  • The largest single recipient received 34% of grant dollars to organisations.
  • In tax year 2024, 48% of grant dollars went to organisations Katherine Wells MacMillan Foundation had funded in earlier filings.
  • No grants were paid directly to organisations outside the US.
  • 92% of grant dollars went to intermediaries that regrant to other organisations.

Grants

6 grants in the latest filing analysed · median $1M

How much do they typically give?

Share of 6 grants in tax year 2024 by size

$250k–$500k17%
$500k–$1M17%
$1M and over67%

Median $1M (tax year 2024)

The largest grants to organisations in the foundation’s latest filing:

  • United Way of Collier and the Keys · Unrestricted
    $1,487,5002024 tax year
  • Community Foundation of the Florida Keys · Unrestricted
    $1,487,5002024 tax year
  • Communities Foundation of Oklahoma · Unrestricted
    $1,000,0002024 tax year
  • New Hampshire Charitable Foundation · Unrestricted
    $1,000,0002024 tax year
  • Grace Jones Community Center · Unrestricted
    $500,0002024 tax year
  • Florida Keys Children's Shelter · Unrestricted
    $250,0002024 tax year

Grants to organisations listed in the foundation’s Form 990-PF filings. Grants to individuals are not shown.

Officers and directors

  • Jennifer J Cullen — Director / Vice President
  • Marianne Short — Director / President

From the latest Form 990-PF filing

3 years of tax filings

YearTotal expensesGrants paidAssetsFiling document
2022 tax year$4,564,971$3,070,000$66,694,220Filing for 2022 tax year
2023 tax year$4,928,838$3,070,000$111,001,709Filing for 2023 tax year
2024 tax year$7,220,070$5,725,000$131,859,393Filing for 2024 tax year

Figures from the foundation’s IRS Form 990-PF filings. Assets are at fair market value at year end. The document icon links to each year’s filing on ProPublica Nonprofit Explorer.

Sources

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Contact

  • Minneapolis, MN