Samuel N & Mary Castle Fdn
The Samuel N & Mary Castle Foundation is a private foundation based in Honolulu, Hawaii. Its 2024 filing lists one grant of $1,936,030 to a Hawaii recipient identified as “SEE ATTACHED STATEMENT”; the foundation’s current listed grant opportunities focus on independent preschools and early education in Hawaii.
Samuel N & Mary Castle Fdn at a glance
In short: Samuel N & Mary Castle Fdn gave $1.9M across 1 grant in 2024 (avg $1.9M), mostly in Hawaii. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $1,936,030
- +4.5% vs 2023
- Grants made (2024)
- 1
- +0.0% vs 2023
- Average grant
- $1,936,030
- +4.5% vs 2023
- Median grant
- $1,936,030
- Total assets
- $38,577,746
- +2.8% vs 2023
- Primary geography
- Hawaii (100% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026.
How to apply to Samuel N & Mary Castle Fdn
- How to Apply
-
The filing names the foundation as the contact and refers applicants to a footnote for forms and materials, deadlines, and award restrictions; those details are not provided here.
- Contact
Application contact: Samuel N Mary Castle Foundation
Mailing address: 733 Bishop Street 1275, Honolulu, HI 96813
Phone: (808) 522-1102
Email: snandmarycastle@hawaii.rr.com
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Open Grants
8 open opportunities from Samuel N & Mary Castle Fdn
Request for Proposals: Achieving and Retaining Accreditation Grant
Samuel N & Mary Castle Fdn
Amount
US $15,000 - US $25,000
Deadline
Deadline not published
RFP- Improving Instructional Quality in Hawaii’s Independent Preschool Grant
Samuel N & Mary Castle Fdn
Amount
Up to US $30,000
Deadline
Deadline not published
RFP: Improving Arts Education for Public and Private Preschools with an Emphasis on Low to Modest Income Families Grant
Samuel N & Mary Castle Fdn
Amount
US $20,000 - US $25,000
Deadline
Deadline not published
Who Samuel N & Mary Castle Fdn funds
How this funder distributes its grants
Grant Size Distribution
172 grants across all recorded years
The most common grant size was under $50K: 104 grants of 172 (60%).
Geographic Focus
Where this funder awards grants
The 2024 filing reports that 100% of grant dollars went to recipients in Hawaii. Both listed grant opportunities focus on preschools in Hawaii.
Grant Distribution by State
Share of the 2024 grant dollars on its one itemized grant.
Cities
How Samuel N & Mary Castle Fdn gives
- Giving held roughly steady from 2021 to 2024 (−5%). Method
- In 2024 it paid out 93% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. 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 2024, annual grant giving ranged from $1.9M (2023) to $2.1M (2020). In 2024 it made 1 grant totaling $1.9M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| See Attached Statement Honolulu, HI | See Attached Statement | $1,936,030 |
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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 |
|---|---|---|---|---|---|---|---|---|
| 2024 | $38,577,746 | $3,748,569 | $2,717,846 | $1,936,030 | 1 | $2,352,726 | $3,393,572 | $2,525,984 |
| 2023 | $37,534,270 | $1,344,463 | $2,581,008 | $1,853,412 | 1 | $2,259,458 | $1,030,903 | $2,308,008 |
| 2022 | $38,775,256 | $2,591,186 | $2,802,653 | $2,090,681 | 53 | $2,536,940 | $2,350,231 | $2,339,581 |
| 2021 | $38,978,941 | $4,122,263 | $2,772,342 | $2,042,742 | 57 | $2,462,520 | $3,831,157 | $2,693,408 |
| 2020 | $37,616,670 | $2,494,673 | $2,715,713 | $2,102,458 | 60 | — | $2,295,607 | $2,289,610 |
Under IRS private-foundation payout rules, Samuel N & Mary Castle Fdn reported a distributable amount of $2.5M for 2024 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated October 2026.
Mission & Focus Areas
The foundation’s listed grant opportunities support efforts to improve instructional quality in Hawaii’s independent preschools, including work aligned with NAEYC standards. One opportunity offers grants for playground, classroom, or other small capital improvements at private preschools that are NAEYC-accredited or seeking accreditation.
The instructional-quality opportunity says grants will be awarded primarily to 501(c)(3) organizations in Hawaii and emphasizes collaborative partnerships and community engagement. The small-capital-improvements opportunity is for 501(c)(3) organizations and calls for board co-investment and community planning.
Grantmaking
The 2024 filing reports one grant totaling $1,936,030. The recipient is listed as “SEE ATTACHED STATEMENT,” with the purpose also given as “SEE ATTACHED STATEMENT.” The filing reports 53 grants totaling $2,090,681 in 2022 and one grant totaling $1,853,412 in 2023.
Two grant opportunities are listed as active. The Improving Instructional Quality in Hawaii’s Independent Preschools opportunity offers awards of up to $30,000, with $200,000 described as the total to be awarded. The Private NAEYC-Accredited or Obtaining Accreditation Preschools Small Capital Improvements opportunity offers awards of up to $25,000. The foundation’s program description advises discussing an application with its Executive Director before applying and urges early submission.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists Alfred L Castle as president and trustee; Cynthia Quisenberry as secretary and trustee; Dr Kittredge Baldwin as vice president and trustee; and Dr Robert Peters as trustee.
Samuel N & Mary Castle Fdn is led by Alfred L. Castle, President & Trustee since 2023 (on filings since 2020); 1 of 4 officers listed in 2024 is compensated.
Officers on the 2024 filing
Alfred L. Castle
President & Trustee
Treasurer & Executive Director → President & Trustee, 2023
On filings since 2020
40 hrs/week
$196K (2020) → $237K (2024)
Cynthia Quisenberry
Secretary & Trustee
On filings since 2020
No compensation reported
Kittredge Baldwin
Vice President & Trustee
On filings since 2020
No compensation reported
Robert Peters
Trustee
President & Trustee → Trustee, 2023
On filings since 2020
No compensation reported
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2024 IRS filing
The highest reported compensation on the 2024 filing was $237K, to Alfred L Castle (President/Trustee).
Frequently asked questions about Samuel N & Mary Castle Fdn
How much does Samuel N & Mary Castle Fdn give each year?
Samuel N & Mary Castle Fdn gave $1.9M across 1 grant in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $1.9M across 1 grant.
How large is Samuel N & Mary Castle Fdn?
Samuel N & Mary Castle Fdn reported $38.6M in total assets on its 2024 IRS Form 990-PF. It paid out $2.4M in qualifying distributions that year, against a required minimum of $2.5M (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What does Samuel N & Mary Castle Fdn fund?
The foundation’s listed grant opportunities support efforts to improve instructional quality in Hawaii’s independent preschools, including work aligned with NAEYC standards. See mission & focus areas ↑
How do I apply for a grant from Samuel N & Mary Castle Fdn?
The filing names the foundation as the contact and refers applicants to a footnote for forms and materials, deadlines, and award restrictions; those details are not provided here. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
Where does Samuel N & Mary Castle Fdn make grants?
The 2024 filing reports that 100% of grant dollars went to recipients in Hawaii. Both listed grant opportunities focus on preschools in Hawaii.
What is Samuel N & Mary Castle Fdn's EIN?
Samuel N & Mary Castle Fdn's EIN (Employer Identification Number) is 99-6003321. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated October 2026.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
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