Samuel N & Mary Castle Fdn
The Samuel N & Mary Castle Fdn is a private foundation based in Honolulu, Hawaii. Its current grant opportunities support improvements in early education at independent preschools in Hawaii, including instructional quality and accreditation.
Key facts about Samuel N & Mary Castle Fdn
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.
- EIN
- 99-6003321
- Latest 990 filing
- Form 990-PF, 2024
- Annual giving (2024)
- $1,936,030
- Grants made (2024)
- 1
- Average grant
- $1,936,030
- Median grant
- $1,936,030
- Total assets
- $38,577,746
- Primary geography
- Hawaii (100% of itemized 2024 grant dollars)
- How to apply
- The foundation states that it does not restrict giving to preselected organizations. Full details ↓
Data from IRS Form 990-PF, 2024; updated September 2026. Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Financial Overview
From 2024 IRS Form 990-PF · View filing
Total Assets
$38.6M
+2.8% YoY
Annual Giving
$1.9M
+4.5% YoY
Grant Count
1
+0.0% YoY
Avg Grant Size
$1.9M
+4.5% YoY
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.
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.
Mission & Focus Areas
The foundation’s current preschool grant opportunities focus on improving instructional quality in Hawaii’s independent preschools, including work aligned with National Association for the Education of Young Children (NAEYC) standards, and on helping independent preschools achieve or retain accreditation. The instructional-quality opportunity describes grants primarily for 501(c)(3) organizations in Hawaii and emphasizes collaboration and community engagement to foster equitable educational opportunities for children ages 0–5. The accreditation opportunity is for Hawaii-based 501(c)(3) organizations and requires matching funds; it gives preference to projects addressing community needs and improving access to quality education for low-income families.
Grantmaking
The foundation reported grant totals of $1,936,030 across 1 grant in 2024, $1,853,412 across 1 grant in 2023, and $2,090,681 across 53 grants in 2022. The 2024 filing lists one grant of $1,936,030 to “SEE ATTACHED STATEMENT” in Honolulu; its stated purpose is also “SEE ATTACHED STATEMENT.”
Review Cycle
.
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
Rolling / Open
RFP- Improving Instructional Quality in Hawaii’s Independent Preschool Grant
Samuel N & Mary Castle Fdn
Amount
Up to US $30,000
Deadline
Rolling / Open
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
Rolling / Open
Ready to take the next step with Samuel N & Mary Castle Fdn?
Geographic Focus
Where this funder awards grants
The 2024 filing shows that 100% of grant dollars went to recipients in Hawaii. Both listed active grant opportunities are focused on independent preschools in Hawaii.
Grant Distribution by State
Share of all 1 itemized 2024 grant dollars.
Cities
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.
Grant Insights
How this funder distributes its grants
Top Recipients
Top 1 recipients in 2024
The largest 2024 recipient was See Attached Statement ($1.9M).
Grant Size Distribution
172 grants across all recorded years
The most common grant size was under $50K: 104 grants of 172 (60%).
Giving History
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| See Attached Statement Honolulu, HI | See Attached Statement | $1,936,030 |
Financial History
Multi-year comparison from IRS filings
| Filing year | Assets | Revenue | Expenses | Grant total | Grant count |
|---|---|---|---|---|---|
| 2024 | $38,577,746 | $3,748,569 | $2,717,846 | $1,936,030 | 1 |
| 2023 | $37,534,270 | $1,344,463 | $2,581,008 | $1,853,412 | 1 |
| 2022 | $38,775,256 | $2,591,186 | $2,802,653 | $2,090,681 | 53 |
| Metric | 2024 | 2023 | 2022 |
|---|---|---|---|
| Total Assets | $38,577,746 | $37,534,270 | $38,775,256 |
| Revenue | $3,748,569 | $1,344,463 | $2,591,186 |
| Expenses | $2,717,846 | $2,581,008 | $2,802,653 |
| Qualifying Distributions | $2,352,726 | $2,259,458 | $2,536,940 |
| Net Investment Income | $3,393,572 | $1,030,903 | $2,350,231 |
| Distributable Amount | $2,525,984 | $2,308,008 | $2,339,581 |
Data update history
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
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).
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
Website: _:// FOUNDATIONCENTER.ORG/GRANTMAKER/CASTLE
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).
What does Samuel N & Mary Castle Fdn fund?
The foundation’s current preschool grant opportunities focus on improving instructional quality in Hawaii’s independent preschools, including work aligned with National Association for the Education of Young Children (NAEYC) standards, and on helping independent preschools achieve or retain accreditation. See mission & focus areas ↑
How do I apply for a grant from Samuel N & Mary Castle Fdn?
The foundation states that it does not restrict giving to preselected organizations. 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 shows that 100% of grant dollars went to recipients in Hawaii. Both listed active grant opportunities are focused on independent 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 September 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Here's the math on researching Samuel N & Mary Castle Fdn by hand.
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