Halvorsen Family Foundation
The Halvorsen Family Foundation is a private foundation based in Stamford, Connecticut. It supports other organizations exempt under IRC Section 501(c)(3) through contributions.
Halvorsen Family Foundation at a glance
In short: Halvorsen Family Foundation gave $34.5M across 33 grants in 2025 (avg $1.0M), mostly in California. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $34,502,270
- +65.2% vs 2024
- Grants made (2025)
- 33
- +83.3% vs 2024
- Average grant
- $1,045,523
- -9.9% vs 2024
- Median grant
- $20,000
- Total assets
- $365,424,634
- +13.5% vs 2024
- Primary geography
- California (58% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
How to apply to Halvorsen Family Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: Viking 600 Washington Blvd 11Th F, Stamford, CT 06901
Phone: (203) 863-5048
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Halvorsen Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Stanford Medical Development ($20.0M). Together the top 10 received $34.0M.
Grant Size Distribution
112 grants across all recorded years
The most common grant size was under $50K: 60 grants of 112 (54%).
Geographic Focus
Where this funder awards grants
In 2025, grant dollars went to recipients in California (58%), New York (20%), Massachusetts (15%), Vermont (4%), and Utah (1%).
Grant Distribution by State
Share of 2025 grant dollars across all 33 itemized grants.
Cities
How Halvorsen Family Foundation gives
- 42% of 2025 grantees were also funded in 2024. Method
- Giving grew 159% from 2022 to 2025. Method
- In 2025 it paid out 219% of its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2025). 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 2025, annual grant giving ranged from $7.1M (2020) to $34.5M (2025). In 2025 it made 33 grants totaling $34.5M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Stanford Medical Development Redwood City, CA | Educational Support | $20,000,000 |
| Sterling and Francine Clark Art Institute Williamstown, MA | Artistic Initiatives | $5,125,000 |
| Memorial Sloan Kettering Cancer Center West Harrison, NY | Medical Support | $5,000,000 |
| Green Mountain Valley School Waitsfield, VT | Educational Support | $1,500,000 |
| Weill Cornell Medicine New York, NY | Medical Support | $1,000,000 |
| US Ski & Snowboard Park City, UT | Athletic Opportunities | $500,000 |
| Wildlife Conservation Society Bronx, NY | Wildlife Conservation | $350,000 |
| The Rockefeller University New York, NY | Educational Support | $275,000 |
| Williams College Williamstown, MA | Educational Support | $200,000 |
| Stanford University Stanford, CA | Educational Support | $100,000 |
Ready to take the next step with Halvorsen Family 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 |
|---|---|---|---|---|---|---|---|---|
| 2025 | $365,424,634 | $35,169,177 | $34,534,700 | $34,502,270 | 33 | $34,512,815 | $646,067 | $15,789,460 |
| 2024 | $322,046,466 | $21,439,948 | $21,087,352 | $20,884,778 | 18 | $20,893,378 | $524,147 | $13,786,260 |
| 2023 | $265,562,093 | $15,475,263 | $14,608,500 | $14,595,000 | 24 | $14,608,500 | $13,381,813 | $11,566,625 |
| 2022 | $235,306,066 | $4,015,208 | $13,315,800 | $13,306,826 | 28 | $13,315,551 | — | $14,248,852 |
| 2021 | $301,427,167 | $4,266,900 | $9,324,900 | $9,314,000 | 9 | — | — | $13,232,854 |
| 2020 | $247,485,930 | $7,138,093 | $7,150,382 | $7,115,124 | 7 | — | — | $9,323,197 |
Under IRS private-foundation payout rules, Halvorsen Family Foundation reported a distributable amount of $15.8M for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
The foundation states that it is not involved in direct charitable activities and that its primary purpose is to support other organizations exempt under IRC Section 501(c)(3).
Its grants show support for a range of organizations. For example, Green Mountain Valley School describes its mission as developing students through ski racing and liberal arts education. The Wildlife Conservation Society says it works to save wildlife and wild places through science, conservation action, education, and public engagement. Rockefeller University describes itself as a center for biomedical and other scientific research and graduate education. The Hospital for Special Surgery Fund says it raises funds for charitable, educational, and scientific purposes of its tax-exempt affiliate and other health-care-related charities.
Grantmaking
In 2025, the foundation made 33 grants totaling $34,502,270. Grant amounts ranged from $1,000 to $20,000,000, with a median of $20,000. It reported 18 grants totaling $20,884,778 in 2024 and 24 grants totaling $14,595,000 in 2023.
Among its largest 2025 grants were $20,000,000 to Stanford Medical Development for educational support, $5,125,000 to the Sterling and Francine Clark Art Institute for artistic initiatives, and $5,000,000 to Memorial Sloan Kettering Cancer Center for medical support. Other large grants included $1,500,000 to Green Mountain Valley School for educational support, $1,000,000 to Weill Cornell Medicine for medical support, and $500,000 to US Ski & Snowboard for athletic opportunities.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Ole Andreas Halvorsen and Diane K. Halvorsen as trustees.
Halvorsen Family Foundation's 2025 filing lists 2 officers; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Diane K. Halvorsen
Trustee
On filings since 2020
0.3 hrs/week
No compensation reported
Ole Andreas Halvorsen
Trustee
On filings since 2020
0.3 hrs/week
No compensation reported
Data from IRS Form 990 filings, 2020–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about Halvorsen Family Foundation
How much does Halvorsen Family Foundation give each year?
Halvorsen Family Foundation gave $34.5M across 33 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $20.9M across 18 grants.
What is Halvorsen Family Foundation's typical grant size?
Halvorsen Family Foundation's median grant in 2025 was $20,000, and its average grant was $1,045,523, across 33 grants on its 2025 IRS Form 990-PF.
Where does Halvorsen Family Foundation give grants?
Halvorsen Family Foundation gives mostly in California: 58% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest states were New York (20%) and Massachusetts (15%). The most frequent recipient cities were New York, NY (6 grants), Darien, CT (5 grants), Stowe, VT (5 grants) and Williamstown, MA (2 grants).
Does Halvorsen Family Foundation give general operating support?
Occasionally: 6% of Halvorsen Family Foundation's 2025 grants with a stated purpose (2 of 33) were for general or operating support, per its 2025 IRS Form 990-PF. Recurring purposes include "Educational Support" (9 grants), "Medical Support" (7 grants) and "Athletic Opportunities" (5 grants).
Who are Halvorsen Family Foundation's largest grantees?
Halvorsen Family Foundation's largest 2025 grantees include Stanford Medical Development ($20,000,000), Sterling and Francine Clark Art Institute ($5,125,000) and Memorial Sloan Kettering Cancer Center ($5,000,000), according to its 2025 IRS Form 990-PF. Together they received 87% of its itemized 2025 grant dollars.
How large is Halvorsen Family Foundation?
Halvorsen Family Foundation reported $365.4M in total assets on its 2025 IRS Form 990-PF. It paid out $34.5M in qualifying distributions that year, against a required minimum of $15.8M (roughly 5% of its investment assets).
What does Halvorsen Family Foundation fund?
The foundation states that it is not involved in direct charitable activities and that its primary purpose is to support other organizations exempt under IRC Section 501(c)(3). See mission & focus areas ↑
How do I apply for a grant from Halvorsen Family Foundation?
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Halvorsen Family Foundation's EIN?
Halvorsen Family Foundation's EIN (Employer Identification Number) is 06-1603158. IRS Form 990 filing data is available on this page for 2020–2025.
Does Halvorsen Family Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated September 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(7)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS October 14, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS March 17, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS April 17, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS April 12, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS September 4, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS April 9, 2026)
- IRS filings on file for fiscal years 2020–2025
Live grants for the work Halvorsen Family Foundation funds
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Browse active grant opportunities in Halvorsen Family Foundation's focus areas in our free grants database
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Cite this profile
Grantable. (2026). Halvorsen Family Foundation funder profile. GrantGraph. Retrieved October 17, 2026, from https://grantable.co/funders/halvorsen-family-foundation-morg_436183bca8df4d42ace47f42eee8f9d0
BibTeX
@misc{grantable_061603158_2026,
author = {{Grantable}},
title = {{Halvorsen Family Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/halvorsen-family-foundation-morg_436183bca8df4d42ace47f42eee8f9d0},
note = {Accessed 2026-10-17. 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 Halvorsen Family 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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