Henry L. Guenther Foundation
At a glance
Key takeaways
- This foundation is based in Seal Beach, CA, and funds charitable organisations operating in the State of California, with particular concern for Southern California, working in areas such as medical services, youth opportunities, individual and family services, homeless and veteran services, medical equipment and technology, food distributions, and educational programmes.
- Most grants to organisations fall between $10,000 and $250,000, with a median grant of $25,000, so a modest, clearly costed request in that range is realistic for most applicants.
- Only 6% of its grant dollars to organisations in its most recent filing went to organisations it had also funded in the prior two filings, suggesting it is open to funding a wide range of applicants rather than being led mainly by existing relationships.
- Apply through the online application by one of the two fixed deadlines, 11:59 p.m. on 31 May or 11:59 p.m. on 31 October; the printable worksheet is for reference only and should not be submitted.
- Those seeking funding for individuals, government agencies, projects receiving substantial government support, sectarian organisations whose principal activity benefits their own members, organisations soliciting funds for projects run by others, loans, political campaigns, endowments, lobbying, normal operating expenses of established programmes, liquidation of prior obligations, projects taking more than 12 months to complete, or grants requiring future-year commitments should not apply, as the foundation does not fund these.
Overview
Henry L. Guenther Foundation is a US private foundation based in Seal Beach, CA.
What they fund
Profile derived from the foundation's IRS Form 990-PF filings (TY2024, TY2023, TY2022) and its website, with every statement checked against those sources. Sources read on 7 October 2026.
Priority Areas
The foundation makes grants to charitable organisations operating in California for programmes benefiting California residents, with particular concern for Southern California. Its purpose is to improve social conditions, promote human welfare and alleviate pain and suffering, principally through improved and expanded medical services, opportunities for youth and similar humanitarian projects. Its past grants have covered medical equipment and technology, individual and family services, food distributions, emergency services, housing, education, and homeless and veteran services. It is principally interested in improving or expanding services through programmes already operating, and selects organisations of demonstrated competence with sound programmes able to reach and sustain high levels of performance.
Themes
- Medical services
- Youth opportunities
- Individual and family services
- Homeless and veteran services
- Medical equipment and technology
- Food distributions
- Educational programs
Geographic Focus
State of California. Priority: Southern California.
What They Don't Fund
- Individuals for any purpose
- Government agencies
- Organizations whose benefits will accrue to these entities (governmental agencies or subdivisions; generally not funded)
- Projects that receive, or expect to receive, substantial support from taxation at any level of government through direct funding, interest free or no interest loans, or the provision of “in kind” services of any type (generally not eligible)
- Sectarian or religious organizations when their principal activity is for the benefit of their own members
- Organizations soliciting funds in support of projects or programs operated by someone other than the applicant (usually not funded)
- Loans
- Political campaigns
- Endowments
- Legislative lobbying efforts
- Normal operating expenses or to aid in the operational phases of established organizations or programs
- Liquidate or reduce previously incurred obligations or operating deficits (in the absence of compelling circumstances)
- Projects that will take more than 12 months to implement and fully execute
- Applications for grants that require a commitment of funds in future years
How to apply
Organisations apply through the online application; the printable worksheet is for reference only and should not be submitted.
Deadlines: Applications are due by 11:59 p.m. on May 31 and 11:59 p.m. on October 31 each year.
Application success factors
- Repeat giving: In its TY2024 filing, 6% of its grant dollars to organisations went to organisations it had also funded in its TY2022 or TY2023 filing.
- Grant size: Across its TY2022, TY2023 and TY2024 filings, half of its 155 grants to organisations were $25,000 or less.
What the foundation says:
- The foundation is principally interested in improved or expanded services through programmes already operating.
- The board selects organisations of demonstrated competence with sound programmes able to sustain high levels of performance.
- The board considers the project's serious, current need and whether it duplicates existing facilities or services in the area.
- The board assesses whether the project budget is reasonable and the requisite non-grant funds are available.
- The project should have efficient and economical management by experienced and competent people.
- The board considers whether results will be communicated and practically used by those whose needs are served.
- The foundation suggests that the requested amount be commensurate with the goals and outcomes outlined in the request.
- Funded organisations must submit detailed reports at six and 12 months, including narratives, budgets, photographs and other relevant reporting information.
- The foundation prefers not to fund multi-year grants.
Where grants go
From grants to organisations in the foundation’s filings for tax years 2022–2024.
Grant dollars by state
- The largest single recipient received 4% of grant dollars to organisations.
- In tax year 2024, 6% of grant dollars went to organisations Henry L. Guenther Foundation had funded in earlier filings.
- No grants were paid directly to organisations outside the US.
Grants
How much do they typically give?
Share of 58 grants in tax year 2024 by size
Median $25,000 (tax year 2024)
The largest grants to organisations in the foundation’s latest filing:
- Rady Children's Hospital San Diego · support the Little Heroes League Care Coordination Program.$500,0002024 tax year
- Cedars-Sinai Medical Center · support Thermo Fisher Bigfoot Spectral Flow Cytometer and Cell Sorter which represents the greatest innovation in the field of research and provides exponential levels of resolution to identify rare single cells contributing to diseases.$450,0002024 tax year
- Providence Little Company of Mary Foundation · support equipment and technology upgrades for the Del Vicario Cardiovascular Center of Excellence to improve the way in which we diagnose and treat cardiovascular care in community.$450,0002024 tax year
- Glendale Adventist Medical Center Foundation · renovate four catheterization labs.$300,0002024 tax year
- Salk Institute for Biological Studies · purchase an Axioscan 7 system.$288,0002024 tax year
- Long Beach Medical Center · purchase a new laser system necessary for minimally invasive cardiovascular procedures including coronary and peripheral atherectomies, thoracic aortic aneurysm repair, endovascular abdominal aortic repair, and more.$250,0002024 tax year
- Braille Institute of America · support library services.$200,0002024 tax year
- Saint John's Health Center Foundation · purchase the next-generation sequencer NextSeq2000.$200,0002024 tax year
Grants to organisations listed in the foundation’s Form 990-PF filings. Grants to individuals are not shown.
Officers and directors
- Eric Mooberry — Director
- Phillip Battaglia — Director
- Charles Leatherbury — Treasurer
- Richard Battaglia — Director
- Susanne Sundberg — Chairman of the Board
- Ann Leatherbury — Vice President / Secretary
From the latest Form 990-PF filing
3 years of tax filings
| Year | Total expenses | Grants paid | Assets | Filing document |
|---|---|---|---|---|
| 2022 tax year | $5,644,540 | $3,753,300 | $97,251,214 | Filing for 2022 tax year |
| 2023 tax year | $5,373,597 | $3,462,000 | $109,294,511 | Filing for 2023 tax year |
| 2024 tax year | $6,491,693 | $4,199,500 | $115,925,175 | Filing for 2024 tax year |
Figures from the foundation’s IRS Form 990-PF filings. Assets are at fair market value at year end. The document icon links to each year’s filing on ProPublica Nonprofit Explorer.
Sources
Registers and filings
Other sources
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At a glance

Applying to Henry L. Guenther Foundation?
Hinchilla drafts your answers around this funder's priorities, using your organisation's own documents.
No credit card required
Contact
- (562) 799-5544
- acolorado@guentherfoundation.org
- Seal Beach, CA
- guentherfoundation.org

Applying to Henry L. Guenther Foundation?
Hinchilla drafts your answers around this funder's priorities, using your organisation's own documents.
No credit card required
Contact
- (562) 799-5544
- acolorado@guentherfoundation.org
- Seal Beach, CA
- guentherfoundation.org