A P Giannini Foundation
The A P Giannini Foundation is a private foundation based in San Rafael, California. Established by an individual recipient in 1945, it supports postdoctoral biomedical research fellowships at California’s accredited medical schools and research intended to advance the translation of biomedical science into treatments, preventions, and cures for human diseases.
A P Giannini Foundation at a glance
In short: A P Giannini Foundation gave $1.2M across 19 grants in 2025 (avg $65K), mostly in California. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $1,243,000
- +11.9% vs 2024
- Grants made (2025)
- 19
- +5.6% vs 2024
- Average grant
- $65,421
- +6.0% vs 2024
- Median grant
- $70,000
- Total assets
- $30,001,895
- +6.9% vs 2024
- Primary geography
- California (100% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026.
How to apply to A P Giannini Foundation
- How to Apply
-
For the 2027 fellowship, submit the application through the online portal and arrange for three references and a mentor to submit their letters. The prospective mentor cannot also serve as one of the three references. The Foundation’s 2024 filing directs applicants to Exhibit 1 for the application materials and restrictions.
- Review Cycle
- November 5, 2026, at 3 p.m. Pacific time for all 2027 fellowship materials, including reference and mentor letters.
- Deadline
- November 5, 2026, at 3 p.m.
- Contact
Application contact: Ken Blum Administrator
Mailing address: PO Box 6106, San Rafael, CA 94903
Phone: (415) 981-2966
Website: https://www.apgianninifoundation.org
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Open Grants
1 open opportunity from A P Giannini Foundation
Who A P Giannini Foundation funds
How this funder distributes its grants
Top Recipients
Top recipient in 2025
The largest 2025 recipient was Stanford University School of Medicine ($280K across 4 grants).
Organizations only. It also paid 15 grants to individuals ($963,000), which are not listed by name.
Grant Size Distribution
91 grants across all recorded years
The most common grant size was in the $50–100K range: 83 grants of 91 (91%).
Geographic Focus
Where this funder awards grants
The Foundation is based in California. Its website describes fellowship support at California’s accredited medical schools. All grant dollars itemized for filing year 2025 went to recipients in California.
Grant Distribution by State
Share of 2025 grant dollars across all 19 itemized grants.
States
Cities
How A P Giannini Foundation gives
- Giving grew 28% from 2022 to 2025. Method
- In 2025 it paid out 116% of its IRS minimum distribution (the 5% rule). Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2025, annual grant giving ranged from $821K (2021) to $1.2M (2025). In 2025 it made 19 grants totaling $1.2M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Stanford University School of Medicine Palo Alto, CA | For Medical Research Fellowship-Basto | $70,000 |
| Stanford University School of Medicine Palo Alto, CA | For Medical Research Fellowship-Chanin | $70,000 |
| Stanford University School of Medicine Palo Alto, CA | For Medical Research Fellowship-Van Egeren | $70,000 |
| Stanford University School of Medicine Palo Alto, CA | For Medical Research Fellowship-Li | $70,000 |
| 15 grants to individuals Recipients not named | — | $963,000 |
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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 | $30,001,895 | $1,962,724 | $1,904,488 | $1,243,000 | 19 | $1,736,519 | $1,532,944 | $1,492,134 |
| 2024 | $28,065,913 | $1,328,839 | $1,750,729 | $1,111,000 | 18 | $1,579,432 | $974,610 | $1,412,584 |
| 2023 | $26,484,221 | $1,375,199 | $1,634,730 | $1,075,000 | 19 | $1,539,591 | $932,537 | $1,302,218 |
| 2022 | $25,150,272 | $992,112 | $1,837,306 | $974,673 | 19 | $1,437,852 | $764,819 | $1,274,772 |
| 2021 | $29,460,942 | $2,499,734 | $1,336,596 | $820,614 | 16 | $1,194,144 | $2,006,628 | $1,419,673 |
| 2020 | $26,078,476 | $1,579,026 | $1,564,051 | $1,239,000 | 23 | — | $1,088,328 | $1,198,703 |
Under IRS private-foundation payout rules, A P Giannini Foundation reported a distributable amount of $1.5M 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’s stated purpose is to support innovative research in basic sciences and applied fields, promoting the discovery and treatment of human disease. Its website says its funding aims to advance biomedical science toward treatments, preventions, and cures and to help fellows develop as investigators and pursue scientific leadership.
The Foundation says it supports postdoctoral medical research fellowships at California’s accredited medical schools, as well as nonprofit organizations engaged in education to improve the quality of life for people with hemophilia. Its website reports that past fellowship research has addressed conditions including heart disease, leukemia, Parkinson’s disease, Alzheimer’s disease, autism, cystic fibrosis, melanoma, hepatitis B, and kidney disease.
Grantmaking
In filing year 2025, the Foundation reported 19 grants totaling $1,243,000. Grant amounts ranged from $7,000 to $70,000, with a median of $70,000. The listed leading awards included $70,000 medical research fellowships through Stanford University School of Medicine, UC Irvine School of Medicine, an individual recipient Diego School of Medicine, and an individual recipient Francisco School of Medicine. The stated purposes identify individual fellowships.
The Foundation’s website describes a 2027 Postdoctoral Research Fellowship & Leadership Award, with awards listed as up to $210,000. Applications are submitted through an online portal. The application requires three reference letters and a mentor’s letter of support, along with a PDF of application materials that includes a biosketch, personal statement, non-technical statement, and research sections. The Foundation’s 2024 filing says to see Exhibit 1 for forms, materials, deadlines, and award restrictions.
Leadership & Key People
Leadership team and compensation from IRS filings
Officers and directors listed on the 2025 filing are Mike Mantle, Treasurer; Mark C. Perry, Chairman; Jack L. Meyers, Vice-Chairman; Keith McWilliams, Secretary; Bruce U. Wintroub, MD, Director; Keith Grossman, Director; Mark Chao, MD, PhD, Director; Virginia Hammerness, Director (noted as deceased May 31, 2025); and Anne McWilliams, Emeritus Trustee.
A P Giannini Foundation is led by Mark C. Perry, Chairman on every filing since 2020; none of the 9 officers listed in 2025 report compensation.
Officers on the 2025 filing
Mark C. Perry
Chairman
On filings since 2020
No compensation reported
Bruce U. Wintroub MD
Director
On filings since 2020
No compensation reported
Virginia Hammerness
Director -
Vice Chairman → Director, 2024
Director → Director -, 2025
On filings since 2020
No compensation reported
Keith Grossman
Director
On filings since 2022
No compensation reported
Mark Chaomdphd
Director
On filings since 2023
No compensation reported
Anne McWilliams
Emeritus Trustee
On filings since 2020
No compensation reported
Jack L. Meyers
Vice Chairman
Director → Vice Chairman, 2024
On filings since 2020
No compensation reported
Keith McWilliams
Secretary
Director → Secretary, 2022
On filings since 2020
No compensation reported
Mike Mantle
Treasurer
On filings since 2020
No compensation reported
Former officers (6)
- Former: Caroline O. Boitano (2020–2024) — Director
- Former: Sally Geier (2020–2024) — Director
- Former: John A. Ronca (2024) — Director
- Former: John Ronco Jr. (2020–2023) — Director
- Former: Carol L. Brosgart MD (2020–2021) — Director
- Former: Hans Reiser MD (2020–2021) — Director
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 A P Giannini Foundation
How much does A P Giannini Foundation give each year?
A P Giannini Foundation gave $1.2M across 19 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $1.1M across 18 grants.
What is A P Giannini Foundation's typical grant size?
A P Giannini Foundation's median grant in 2025 was $70,000, and its average grant was $65,421, across 19 grants on its 2025 IRS Form 990-PF.
Where does A P Giannini Foundation give grants?
A P Giannini Foundation gives mostly in California: 100% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Palo Alto, CA (4 grants).
Does A P Giannini Foundation give general operating support?
Not in 2025: none of the 19 grants with a stated purpose on A P Giannini Foundation's 2025 IRS Form 990-PF were described as general or operating support.
How large is A P Giannini Foundation?
A P Giannini Foundation reported $30.0M in total assets on its 2025 IRS Form 990-PF. It paid out $1.7M in qualifying distributions that year, against a required minimum of $1.5M (roughly 5% of its investment assets).
What does A P Giannini Foundation fund?
The Foundation’s stated purpose is to support innovative research in basic sciences and applied fields, promoting the discovery and treatment of human disease. See mission & focus areas ↑
How do I apply for a grant from A P Giannini Foundation?
For the 2027 fellowship, submit the application through the online portal and arrange for three references and a mentor to submit their letters. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is A P Giannini Foundation's EIN?
A P Giannini Foundation's EIN (Employer Identification Number) is 94-6089512. IRS Form 990 filing data is available on this page for 2020–2025.
Data last updated October 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 May 4, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 11, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 3, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS February 28, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS March 13, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS March 10, 2026)
- IRS filings on file for fiscal years 2020–2025
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