Winslow Foundation
The Winslow Foundation is a private foundation based in Wilmington, Delaware. Its 2024 grants supported organizations working on climate and environmental issues, health, civic education, and related areas.
Winslow Foundation at a glance
In short: Winslow Foundation gave $1.9M across 57 grants in 2024 (avg $33K), top state Maryland. 32% of 2024 grantees were new. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $1,878,000
- -0.3% vs 2023
- Grants made (2024)
- 57
- +23.9% vs 2023
- Average grant
- $32,947
- -19.6% vs 2023
- Median grant
- $20,000
- Total assets
- $30,381,441
- +6.3% vs 2023
- New grantees (estimate)
- 32% first-time grantees (18 of 56, 2024)
- Primary geography
- Maryland (20% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to Winslow Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation does not accept unsolicited requests for funds and makes contributions only to preselected charitable organizations.
- Contact
Mailing address: Foundation Source 501 Silverside Rd, Wilmington, DE 19809-1377
Phone: (800) 839-1754
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Winslow Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
The largest 2024 recipient was Mothers Out Front Inc ($250K). Together the top 10 received $1.1M.
Grant Size Distribution
261 grants across all recorded years
The most common grant size was under $50K: 171 grants of 261 (66%).
Geographic Focus
Where this funder awards grants
In 2024, the largest shares of grant dollars went to recipients in Maryland (20%), Massachusetts (19%), the District of Columbia (13%), California (13%), and North Carolina (6%).
Grant Distribution by State
Share of 2024 grant dollars across all 57 itemized grants.
States
Cities
Is Winslow Foundation open to new grantees?
32%
first-time grantees, 2024
In 2024, 18 of 56 grantees (32%) were first-time recipients. First grants averaged $22K; repeat grants $39K. How we count
Medians: $23K first-time, $5K repeat.
- 63% of 2024 grantees were also funded in 2023. Method
- Giving held roughly steady from 2021 to 2024 (−15%). Method
- In 2024 it paid out 100% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2024). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $1.7M (2022) to $2.2M (2021). In 2024 it made 57 grants totaling $1.9M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Mothers Out Front Inc Boston, MA | General & Unrestricted | $250,000 |
| Johns Hopkins University Baltimore, MD | Planetary Health Alliance | $200,000 |
| Keep Our Republic Charitable Fund Natl Harbor, MD | General & Unrestricted | $175,000 |
| Cambridge Health Alliance Foundation Inc Malden, MA | Climate Health Organizing Fellows Program | $100,000 |
| Stanford University Stanford, CA | Conservation Center for Biology | $100,000 |
| Marine Conservation Biology Institute Seattle, WA | General & Unrestricted | $80,000 |
| Royal Roads University | Cascade Institute | $75,000 |
| Appalachian Voices Boone, NC | General & Unrestricted | $50,000 |
| Climate Cabinet Education San Francisco, CA | General & Unrestricted | $50,000 |
| Global Impact Washington, DC | Future US | $50,000 |
Ready to take the next step with Winslow Foundation?
Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2024 | $30,381,441 | $4,249,645 | $2,452,289 | $1,878,000 | 57 | $2,093,614 | $3,896,142 | $2,099,041 |
| 2023 | $28,584,085 | $1,341,160 | $2,409,633 | $1,883,999 | 46 | $2,085,923 | $1,057,258 | $2,181,160 |
| 2022 | $29,425,846 | $1,187,802 | $2,309,515 | $1,726,733 | 46 | $1,967,619 | $870,026 | $1,817,387 |
| 2021 | $30,547,559 | $3,884,551 | $2,841,728 | $2,211,160 | 57 | $2,462,037 | $3,537,009 | $2,471,866 |
| 2020 | $29,424,736 | $5,769,068 | $2,681,965 | $2,120,000 | 55 | — | $5,489,361 | $2,011,905 |
Under IRS private-foundation payout rules, Winslow Foundation reported a distributable amount of $2.1M for 2024 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2024 grants included support for climate and environmental work, health-related initiatives, and civic education. For example, Mothers Out Front describes its mission as building mothers’ power to ensure a livable climate for children; Climate Cabinet Education says it combines data science and policy expertise to educate local leaders on climate solutions; and Keep Our Republic Charitable Fund describes itself as a nonpartisan civic education organization focused on trust in elections, the rule of law, and constitutional checks and balances.
Grantmaking
In 2024, the foundation made 57 grants totaling $1,878,000. Grants ranged from $500 to $250,000, with a median grant of $20,000.
Among its largest 2024 grants were $250,000 to Mothers Out Front Inc. for general and unrestricted support; $200,000 to Johns Hopkins University for the Planetary Health Alliance; $175,000 to Keep Our Republic Charitable Fund for general and unrestricted support; and $100,000 to Cambridge Health Alliance Foundation Inc. for its Climate Health Organizing Fellows Program. Other grants included $100,000 to Stanford University for the Conservation Center for Biology, $80,000 to Marine Conservation Biology Institute for general and unrestricted support, and $75,000 to Royal Roads University for the Cascade Institute.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists Morgan McMillan as secretary and executive director; Christopher Wirth as vice president, trustee, and treasurer; Kelsey Wirth as trustee and president; and Wren W Wirth as trustee.
Winslow Foundation is led by Morgan McMillan, Secretary & Executive Director on every filing since 2020; 1 of 4 officers listed in 2024 is compensated.
Officers on the 2024 filing
Morgan McMillan
Secretary & Executive Director
On filings since 2020
40 hrs/week
$96K (2020) → $118K (2024)
Kelsey Wirth
Trustee & President
On filings since 2020
4 hrs/week
No compensation reported
Wren W Wirth
Trustee
On filings since 2020
1 hr/week
$33K (2020) → $0 (2024)
Christopher Wirth
Vice President, Trustee & Treasurer
On filings since 2020
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2024 IRS filing
The highest reported compensation on the 2024 filing was $118K, to Morgan McMillan (Sec, executive dir).
Frequently asked questions about Winslow Foundation
How much does Winslow Foundation give each year?
Winslow Foundation gave $1.9M across 57 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $1.9M across 46 grants.
What is Winslow Foundation's typical grant size?
Winslow Foundation's median grant in 2024 was $20,000, and its average grant was $32,947, across 57 grants on its 2024 IRS Form 990-PF. Organizations receiving their first grant from Winslow Foundation that year got $22K on average.
Where does Winslow Foundation give grants?
Winslow Foundation's top state is Maryland, with 20% of the grant dollars itemized on its 2024 IRS Form 990-PF. The next largest states were Massachusetts (19%) and District of Columbia (13%). The most frequent recipient cities were Washington, DC (8 grants), Boulder, CO (7 grants), Denver, CO (4 grants) and Boston, MA (2 grants).
Does Winslow Foundation give general operating support?
Yes: 74% of Winslow Foundation's 2024 grants with a stated purpose (42 of 57) were for general or operating support, per its 2024 IRS Form 990-PF.
Who are Winslow Foundation's largest grantees?
Winslow Foundation's largest 2024 grantees include Mothers Out Front Inc ($250,000), Johns Hopkins University ($200,000) and Keep Our Republic Charitable Fund ($175,000), according to its 2024 IRS Form 990-PF. Together they received 33% of its itemized 2024 grant dollars.
How large is Winslow Foundation?
Winslow Foundation reported $30.4M in total assets on its 2024 IRS Form 990-PF. It paid out $2.1M in qualifying distributions that year, against a required minimum of $2.1M (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What does Winslow Foundation fund?
No mission statement for the foundation is provided. Its 2024 grants included support for climate and environmental work, health-related initiatives, and civic education. See mission & focus areas ↑
How do I apply for a grant from Winslow Foundation?
The foundation does not accept unsolicited requests for funds and makes contributions only to preselected charitable organizations. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Winslow Foundation's EIN?
Winslow Foundation's EIN (Employer Identification Number) is 22-2778703. IRS Form 990 filing data is available on this page for 2020–2024.
Does Winslow Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
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Cite this profile
Grantable. (2026). Winslow Foundation funder profile. GrantGraph. Retrieved October 13, 2026, from https://grantable.co/funders/winslow-foundation-morg_02f9de5b67d64f04b2e5904164732226
BibTeX
@misc{grantable_222778703_2026,
author = {{Grantable}},
title = {{Winslow Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/winslow-foundation-morg_02f9de5b67d64f04b2e5904164732226},
note = {Accessed 2026-10-13. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from Winslow Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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