Nancy and Geoffrey Stack Family
Nancy and Geoffrey Stack Family is a private foundation based in Newport Beach, California. It reported 15 grants totaling $1,120,500 in filing year 2025. Its grants supported organizations including a university foundation, a medical research organization, and organizations providing services related to domestic violence, housing, and community philanthropy.
Nancy and Geoffrey Stack Family at a glance
In short: Nancy and Geoffrey Stack Family gave $1.1M across 15 grants in 2025 (avg $75K), mostly in California. 13% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $1,120,500
- -65.5% vs 2024
- Grants made (2025)
- 15
- -31.8% vs 2024
- Average grant
- $74,700
- -49.5% vs 2024
- Median grant
- $10,000
- Total assets
- $2,651,280
- +5.5% vs 2024
- New grantees (estimate)
- 13% first-time grantees (2 of 15, 2025; small sample)
- Primary geography
- California (94% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to Nancy and Geoffrey Stack Family
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests.
- Contact
Mailing address: 3501 Jamboree Road North Tower 6100, Newport Beach, CA 92660
Phone: (818) 999-6967
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Nancy and Geoffrey Stack Family funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Uc San Diego Foundation ($825K). Together the top 10 received $1.1M.
Grant Size Distribution
125 grants across all recorded years
The most common grant size was under $50K: 93 grants of 125 (74%).
Geographic Focus
Where this funder awards grants
In 2025, 94% of grant dollars went to recipients in California, 3% to recipients in Washington, DC, 2% to recipients in Pennsylvania, and 1% to recipients in Virginia.
Grant Distribution by State
Share of 2025 grant dollars across all 15 itemized grants.
Cities
Is Nancy and Geoffrey Stack Family open to new grantees?
13%
first-time grantees, 2025
In 2025, 2 of 15 grantees (13%) were first-time recipients. With only 15 grantees, that is a small sample: one grantee more or less moves the share by about 7 points. First grants averaged $8K; repeat grants $85K. How we count
Medians: $8K first-time, $15K repeat.
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2025). 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 $1.1M (2025) to $3.3M (2024). In 2025 it made 15 grants totaling $1.1M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Uc San Diego Foundation La Jolla, CA | General Support | $825,000 |
| Cystinosis Research Foundation Irvine, CA | General Support | $100,000 |
| Laura's House Ladera Ranch, CA | General Support | $50,000 |
| Georgetown University Scholarship Washington, DC | General Support | $25,000 |
| Achieve San Francisco, CA | General Support | $25,000 |
| University of Pennsylvania Philidelphia, PA | General Support | $25,000 |
| The Wooden Floor Santa Ana, CA | General Support | $15,000 |
| ULI Foundation Washington, DC | General Support | $10,000 |
| Habitat for Humanity Santa Ana, CA | General Support | $10,000 |
| Marine Corps Scholarship Foundation Dumfries, VA | General Support | $10,000 |
Ready to take the next step with Nancy and Geoffrey Stack Family?
Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income |
|---|---|---|---|---|---|---|---|
| 2025 | $2,651,280 | $1,221,400 | $1,125,083 | $1,120,500 | 15 | $1,120,500 | $221,400 |
| 2024 | $2,513,991 | $2,296,976 | $3,255,923 | $3,252,000 | 22 | $3,252,000 | $146,976 |
| 2023 | $3,506,619 | $2,618,938 | $1,587,056 | $1,584,500 | 19 | $1,584,500 | $43,938 |
| 2022 | $2,125,373 | $2,123,646 | $2,101,046 | $2,095,000 | 35 | $2,095,000 | $48,646 |
| 2021 | $2,613,813 | $1,904,449 | $1,584,289 | $1,584,000 | 34 | $1,584,000 | $304,449 |
| 2020 | $2,251,064 | $1,272,794 | $1,329,368 | $1,328,500 | 29 | — | $62,794 |
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2025 grants included $825,000 to the UC San Diego Foundation, whose stated mission is to raise private support for UC San Diego’s research, teaching, and public service. The Cystinosis Research Foundation, which received $100,000, says it funds research toward a cure and works to improve the quality of life of people with cystinosis. Laura’s House, which received $50,000, describes its work as addressing beliefs and behaviors that perpetuate domestic violence and creating a safe space for individuals and families affected by abuse.
Other 2025 recipients included Habitat for Humanity, which describes locally governed homebuilding work in Greater Sacramento, and the Orange County Community Foundation, which says it aims to transform community intentions into greater impact for good.
Grantmaking
In filing year 2025, the foundation reported 15 grants totaling $1,120,500. Grant amounts ranged from $500 to $825,000, with a median of $10,000. The largest grants were $825,000 to the UC San Diego Foundation, $100,000 to the Cystinosis Research Foundation, and $50,000 to Laura’s House. Other listed grants included $25,000 each to Georgetown University Scholarship, Achieve, and the University of Pennsylvania.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Nancy Stack and Geoffrey L. Stack as trustees.
Nancy and Geoffrey Stack Family's 2025 filing lists 2 officers; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Geoffrey L. Stack
Trustee
On filings since 2020
No compensation reported
Nancy Stack
Trustee
On filings since 2020
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 Nancy and Geoffrey Stack Family
How much does Nancy and Geoffrey Stack Family give each year?
Nancy and Geoffrey Stack Family gave $1.1M across 15 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $3.3M across 22 grants.
What is Nancy and Geoffrey Stack Family's typical grant size?
Nancy and Geoffrey Stack Family's median grant in 2025 was $10,000, and its average grant was $74,700, across 15 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from Nancy and Geoffrey Stack Family that year got $8K on average.
Where does Nancy and Geoffrey Stack Family give grants?
Nancy and Geoffrey Stack Family gives mostly in California: 94% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Washington, DC (2 grants) and Santa Ana, CA (2 grants).
Does Nancy and Geoffrey Stack Family give general operating support?
Yes: 100% of Nancy and Geoffrey Stack Family's 2025 grants with a stated purpose (15 of 15) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Nancy and Geoffrey Stack Family's largest grantees?
Nancy and Geoffrey Stack Family's largest 2025 grantees include Uc San Diego Foundation ($825,000), Cystinosis Research Foundation ($100,000) and Laura's House ($50,000), according to its 2025 IRS Form 990-PF. Together they received 87% of its itemized 2025 grant dollars.
How large is Nancy and Geoffrey Stack Family?
Nancy and Geoffrey Stack Family reported $2.7M in total assets on its 2025 IRS Form 990-PF. Its revenue that year was $1.2M.
What does Nancy and Geoffrey Stack Family fund?
No mission statement for the foundation is provided. Its 2025 grants included $825,000 to the UC San Diego Foundation, whose stated mission is to raise private support for UC San Diego’s research, teaching, and public service. See mission & focus areas ↑
How do I apply for a grant from Nancy and Geoffrey Stack Family?
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Nancy and Geoffrey Stack Family's EIN?
Nancy and Geoffrey Stack Family's EIN (Employer Identification Number) is 71-1019812. IRS Form 990 filing data is available on this page for 2020–2025.
Does Nancy and Geoffrey Stack Family 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
(2)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2025 (received by the IRS August 17, 2026)
- IRS filings on file for fiscal years 2020–2024
Explore Open Grants
Browse active grant opportunities in Nancy and Geoffrey Stack Family's focus areas in our free grants database
Similar Funders
Funders that support many of the same organizations
Enterprise Holdings Foundation
Saint Louis, MO
The Enterprise Holdings Foundation supports charitable and educational nonprofits in communities where Enterprise Mobility operates, focusing on health, education, arts, and disaster relief; applicants must be actively supported by an Enterprise Mobility team member, spouse, or domestic partner. Giving varies widely: it reported 9,499 grants in 2024, but its 2025 filing showed one grant of $101.4 million, so that amount is not a typical award. Applications are accepted at any time through eligible Enterprise-affiliated applicants; the Foundation does not limit giving to preselected organizations.
Assets
$594.3M
Grants
1
Total Given
$101.4M
IBM International Foundation
Armonk, NY
The IBM International Foundation funds education and workforce programs that build 21st-century and technology job skills, including initiatives for underserved students and job seekers. Its 2024 grants ranged from $10,000 to $8.48 million, with a median of $100,000, and went to organizations across several U.S. states, especially Delaware and Massachusetts. It funds only preselected organizations and does not accept unsolicited requests.
Assets
$357.7M
Grants
16
Total Given
$11.7M
Huang Family Foundation
Newport Beach, CA
Assets
$1.8M
Grants
5
Total Given
$355K
Argyros Family Foundation
Costa Mesa, CA
The Argyros Family Foundation funds medical care, education, arts, and public charities, primarily in California, with additional giving in Arizona, Idaho, Texas, and Washington, DC. Its 2025 grants ranged from $500 to $6.27 million, with a median of $25,000. It does not limit giving to preselected organizations; requests are due June 1 and should include organizational background, intended use, federal ID number, and IRS 501(c)(3) determination letter.
Assets
$311.7M
Grants
132
Total Given
$33.8M
Oneroot Foundation
Ketchum, ID
The ONEROOT FOUNDATION funds education and scholarships, ALS research, children’s basic needs, and community and leadership programs, with most 2025 grant dollars going to California and Colorado. Its 2025 grants had a median of $25,000 and ranged from $500 to $2,616,897. It gives only to preselected charitable organizations and does not accept unsolicited funding requests.
Assets
$3.7M
Grants
61
Total Given
$8.9M
Frome Family Foundation
Costa Mesa, CA
The Frome Family Foundation funds medical research and social services, including work supporting families and young people, with 2024 grants going to California organizations. Grants ranged from $1,000 to $60,000, with a median of $10,000; it funds only preselected organizations and does not accept unsolicited requests.
Assets
$14.4M
Grants
66
Total Given
$830K
More similar funders
More Funders in California
Cite this profile
Grantable. (2026). Nancy and Geoffrey Stack Family funder profile. GrantGraph. Retrieved October 11, 2026, from https://grantable.co/funders/nancy-and-geoffrey-stack-family-morg_af68a4a64b554257a7cc7e69f6d4c3a1
BibTeX
@misc{grantable_711019812_2026,
author = {{Grantable}},
title = {{Nancy and Geoffrey Stack Family funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/nancy-and-geoffrey-stack-family-morg_af68a4a64b554257a7cc7e69f6d4c3a1},
note = {Accessed 2026-10-11. 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 Nancy and Geoffrey Stack Family'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.
Nancy and Geoffrey Stack Family down — hundreds of funders to go?