The Halvorsen Family Foundation is a private family foundation established in 2000 and based in Stamford, Connecticut. It operates as a 501(c)(3) organization classified under philanthropy, voluntarism, and grantmaking foundations. The foundation takes a highly selective, proactive approach to grantmaking, focusing primarily on organizations with personal connections to the Halvorsen family rather than accepting unsolicited applications.
Financial Overview
From 2024 IRS Form 990-PF · View filing
Total Assets
$322.0M
+21.3% YoY
Annual Giving
$20.9M
+43.1% YoY
Grant Count
18
-25.0% YoY
Avg Grant Size
$1.2M
+90.8% YoY
Under IRS private-foundation payout rules, Halvorsen Family Foundation reported a distributable amount of $13.8M for 2024 — the minimum it must pay out in qualifying distributions.
Mission & Focus Areas
The foundation supports a diverse range of causes including:
- Education (particularly higher education institutions with family connections)
- Arts and culture
- Environmental conservation and biodiversity
- Health and wellness
- Economic justice
- Outdoor recreation
The foundation does not operate formal grant programs with fixed deadlines or public application processes.
Grantmaking
Grant Range
** $10,000 to $20,000,000
Invitation Only
** The foundation does not accept unsolicited grant applications. Grantmaking is invitation-only and highly targeted, with strategic grants made throughout the year to preselected organizations.
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Geographic Focus
Where this funder awards grants
The foundation primarily funds organizations in Connecticut and surrounding New England states, including:
- Connecticut
- New York
- Massachusetts
- Vermont
- Maine
The foundation has also made limited grants in California, Pennsylvania, Utah, Minnesota, and internationally in Norway and France.
Grant Distribution by State
Cities
Financial History
Multi-year comparison from IRS filings
Total Assets: $322,046,466 (2024)
Annual Revenue: $21,439,948 (2024)
Annual Expenses: $21,087,352 (2024)
Net Income: $352,596 (2024)
Asset Growth: The foundation has grown significantly from initial assets of $16.2 million in 2011 to over $322 million by 2024.
| Metric | 2024 | 2023 | 2022 |
|---|---|---|---|
| Total Assets | $322,046,466 | $265,562,093 | $235,306,066 |
| Revenue | $21,439,948 | $15,475,263 | $4,015,208 |
| Expenses | $21,087,352 | $14,608,500 | $13,315,800 |
| Qualifying Distributions | $20,893,378 | $14,608,500 | $13,315,551 |
| Net Investment Income | $524,147 | $13,381,813 | — |
| Distributable Amount | $13,786,260 | $11,566,625 | $14,248,852 |
Giving Over Time
Total grant dollars and number of grants per year
Grant Insights
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
Grant Size Distribution
86 grants across all recorded years
Giving History
Grant recipients and amounts by year
Among its reported 2024 grants, the largest include Stanford Medical Development ($20,000,000), Williams College ($350,000), Sterling and Francine Clark Art Institute ($100,000).
| Recipient | Purpose | Amount |
|---|---|---|
| GREENS LEDGE LIGHT PRESERVATION ROWAYTON, CT | PRESERVATION SUPPORT | $25,000 |
| MASSACHUSETTS MUSEUM OF CONTEMPORARY ART FOUNDATION INC NORTH ADAMS, MA | ARTISTIC INITIATIVES | $25,000 |
| NENSA NEW GLOUCESTER, ME | ATHLETIC OPPORTUNITIES | $50,000 |
| NORAM | GENERAL SUPPORT | $30,000 |
| STERLING AND FRANCINE CLARK ART INSTITUTE WILLIAMSTOWN, MA | ARTISTIC INITIATIVES | $100,000 |
| THE HOSPITAL FOR SPECIAL SURGERY FUND INC NEW YORK, NY | MEDICAL SUPPORT | $60,000 |
| THE ROCKEFELLER UNIVERSITY NEW YORK, NY | EDUCATIONAL SUPPORT | $50,000 |
| WILDLIFE CONSERVATION SOCIETY BRONX, NY | WILDLIFE CONSERVATION | $100,000 |
| WILLIAMS COLLEGE WILLIAMSTOWN, MA | EDUCATIONAL SUPPORT | $350,000 |
| AKTIV MOT KREFT | MEDICAL SUPPORT | $4,778 |
Leadership & Key People
Leadership team and compensation from IRS filings
Trustees:
- Ole Andreas Halvorsen (Co-founder of Viking Global Investors, a Connecticut-based hedge fund firm; born 1961, originally from Norway)
- Diane K. Halvorsen (spouse)
Compensation Overview
From 2024 IRS filing
From 2024 filing
| Name | Title | Hours | Compensation |
|---|---|---|---|
| OLE ANDREAS HALVORSEN | TRUSTEE | 0.3 | — |
| DIANE K HALVORSEN | TRUSTEE | 0.3 | — |
Contact Information
Address: Viking 600 Washington Blvd, 11th Floor, Stamford, CT 06901
Phone: (203) 863-5039 or (203) 863-5048
Website: The foundation does not maintain a public website and does not provide an email address for inquiries.
Subject Areas
Focus areas based on grantmaking activity
Frequently Asked Questions
What does Halvorsen Family Foundation fund?
The foundation supports a diverse range of causes including: • Education (particularly higher education institutions with family connections) • Arts and culture • Environmental conservation and biodiversity • Health and wellness • Economic justice • Outdoor recreation The foundation does not operate formal grant programs with fixed deadlines or public application processes.
How do I apply for a grant from Halvorsen Family Foundation?
**Grant Range:** $10,000 to $20,000,000 **Annual Giving:** Approximately $21 million (2024) **Application Process:** The foundation does not accept unsolicited grant applications. Grantmaking is invitation-only and highly targeted, with strategic grants made throughout the year to preselected organizations. **Recent Grants (2023):** • Clark Art Institute: $5,450,000 (Artistic Initiatives) • United States Ski and Snowboard Association: $1,000,000 (Athletic Opportunities) • Williams College: $550…
Where does Halvorsen Family Foundation make grants?
The foundation primarily funds organizations in Connecticut and surrounding New England states, including: • Connecticut • New York • Massachusetts • Vermont • Maine The foundation has also made limited grants in California, Pennsylvania, Utah, Minnesota, and internationally in Norway and France.
What size grants does Halvorsen Family Foundation award?
In 2024, Halvorsen Family Foundation awarded 18 grants totaling $20.9M — an average of about $1.2M per grant, based on its IRS Form 990 filings.
How much is Halvorsen Family Foundation required to give away each year?
Private foundations must generally distribute about 5% of their assets annually. For 2024, Halvorsen Family Foundation reported a distributable amount of $13.8M on its IRS Form 990-PF — the minimum it must pay out in qualifying distributions.
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 2020–2024.
Explore Open Grants
Browse active grant opportunities in Halvorsen Family Foundation's focus areas in our free grants database
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Data last updated June 2026. Sourced from IRS Form 990-PF filings. Research dossier generated April 2026.
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