· Private foundation
Samuel N & Mary Castle Fdn
Its FY2024 filing reports that it accepted unsolicited grant applications.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2020–2024.
Where the money goes
Your grants by size, and where they go.
The 42 grants below total $1,808,412 — the rows itemised in this filing. The $1,853,412 headline is the total grant expense reported on the return, so the remaining $45,000 is giving the schedule does not break out: grants under the $5,000 itemisation floor, grants to individuals, and grants reported on other schedules. Every figure below describes the itemised rows only.
By grant size · FY2023
- $10k–50k23 grants · $489k
- $50k–250k19 grants · $1.3M
| Recipient | Amount |
|---|---|
| Erikson Institute | $134,167 |
| University of Hawaii Foundation | $125,000 |
| Punahou School | $100,000 |
| Hawaii Community Foundation | $100,000 |
| Chaminade University of Honolulu | $75,000 |
| Hawaii Children's Action Network | $75,000 |
| Child & Family Service | $75,000 |
| Chaminade University of Honolulu | $60,000 |
| Kokua Kalihi Valley Comprehensive Family Services | $60,000 |
| Catholic Diocese of Honolulu | $60,000 |
| Partners in Development Foundation | $55,000 |
| Catholic Charities | $50,000 |
| Family Hui Hawaii | $50,000 |
| Kapiolani Health Foundation | $50,000 |
| PATCH (People Attentive to Children) | $50,000 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Your human-services grants (FY20–22, $471k) land where the poverty rate runs at 9%, against an area that typically sits at 11%. 0% of those dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
And the relationships you keep tend to grow: grantees you re-up on have seen median revenue of +39% since the first grant, against +22% for the ones you funded once.
36 repeat relationships — 0 still active in FY2023, 36 since wound down; 39 grantees were first funded in FY2023 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2023, 0% of grant dollars renewed an existing relationship; $1.8M went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). The earliest year is left-censored: relationships that predate the data read as “new.” Theme is the grantee’s IRS cause.
Backed again, and grew
- UOUNIVERSITY OF HAWAII FOUNDATION3× · 2020–2022 · $526k · revenue +132%
- HCHAWAII CHILDREN'S ACTION NETWORK3× · 2020–2022 · $300k · revenue +275%
- EIErikson Institute2× · 2021–2022 · $278k · revenue +1%
Funded once
- PSPUNAHOU SCHOOLone grant, 2022 · $100k · revenue +20%
- DODEPARTMENT OF EDUCATIONone grant, 2022 · $100k
- NLNational Louis Universitygraduatedone grant, 2021 · $88k · revenue +31%
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
Preserve niihau cultural values and language.
See schedule o.at honolulu waldorf school, we educate each child to find meaning, passion, and purpose in life and to contribute to the creation of a better world for all. through a curriculum based on the developmental stages of the human…
Papahana kuaola's mission is to create quality educational programs focused on environmental restoration and economic sustainability fully integrated with hawaiian knowledge in order to exemplify a lifestyle respectful of kanaka, `aina,…
Waimea country school's mission is to educate children to become confident, responsible, and compassionate people.
Kapi'olani medical specialists (dba hawai'i pacific health medical group) is a multispecialty provider group dedicated to providing world-class care for adults and children across hawai'i and the pacific region working in partnership with…
To develop educated, well-rounded individuals who are well prepared for college.
Serving and perpetuating sustainable hawaiian communities through education with aloha.
Our mission is to provide young children in hawai'i experiences that cultivate their social, emotional, physical, and cognitive development through play, exploration, and connection.
To provide 3-4 year old with early childhood education
For reference, the grantee most central to the portfolio’s shape is Hanahauoli School and the most unlike its peers is Candid. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
Your grantees are a median of 52 years old; the field is 15. You back the established end — and your money leans older still.
The field is 24% startups (under 5 years old) — 0% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 13% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
45 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, not grant rows in a single year — so this will not match the grant count on the cover. 45 of the 109 grantees resolved in that span have returns of their own we could reconcile; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.
- Who funds UNIVERSITY OF HAWAII FOUNDATION ↗
- Who funds HAWAII CHILDREN'S ACTION NETWORK ↗
- Who funds Erikson Institute ↗
- Who funds CATHOLIC CHARITIES HAWAII ↗
- Who funds CHILD AND FAMILY SERVICE ↗
- Who funds CHAMINADE UNIVERSITY OF HONOLULU ↗
- Who funds IMUA FAMILY SERVICES ↗
- Who funds MAUI FAMILY SUPPORT SERVICES INC ↗
- Who funds INSTITUTE FOR NATIVE PACIFIC EDUCATION AND CULTURE ↗
- Who funds Collaborative Support Services Inc ↗
- Who funds YWCA OF HAWAII ISLAND ↗
- Who funds PARENTS AND CHILDREN TOGETHER ↗
- Who funds PARTNERS IN DEVELOPMENT FOUNDATION ↗
- Who funds HAWAII COMMUNITY FOUNDATION ↗
- Who funds RAINBOW SCHOOL ↗
- Who funds KCAA PRESCHOOLS OF HAWAII ↗
- Who funds PUNAHOU SCHOOL ↗
- Who funds WAIKIKI COMMUNITY CENTER ↗
- Who funds SEAGULL SCHOOLS INC ↗
- Who funds National Louis University ↗
- Who funds HANAHAUOLI SCHOOL ↗
- Who funds HANALANI SCHOOLS ↗
- Who funds ST ANDREW'S SCHOOLS ↗
- Who funds FAMILY HUI HAWAII ↗
- Who funds HAWAII FOODBANK INC ↗
- Who funds FRIENDS OF THE FUTURE ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
Open a dossier: Atherton Family Foundation · McInerny Foundation-- · Trustees of the Estate of Bernice Pauahi Bishop Dba Kamehameha Schools · Bank of Hawaii Charitable Fdn · Tradewind Group Foundation · George N Wilcox General Trust · Aloha United Way Inc · J Watumull Fund · Central Pacific Bank Foundation · Kosasa Foundation · First Hawaiian Bank Foundation · The Harry and Jeanette Weinberg Foundation Inc
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization Samuel N & Mary Castle Fdn funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal or a single department — and drag the year to watch it move.
- Third Sector New England Inc — 3% of income from government
Government income is each org’s traced federal awards (USASpending — grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that your grant caused the public funding. Coverage is precision-first — a floor, not a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12–24 months.
Warm introductions · Powered by PlinthPlus
How do I get to Samuel N & Mary Castle Fdn?
Find your warmest path to Samuel N & Mary Castle Fdn through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.
Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.