· Private foundation
Janet & Robert W Postma Foundation
Its FY2025 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.
What you funded, over time
Every grant clustered by its grantee’s IRS cause code (NTEE), by year — across FY2021–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k15 grants · $56k
- $10k–50k12 grants · $161k
- $50k–250k4 grants · $253k
| Recipient | Amount |
|---|---|
| Southhampton Hospital Foundation | $100,000 |
| North Sea Maritime Center | $51,500 |
| HSS Foundation | $51,000 |
| Leadership Roundtable | $50,000 |
| CMTA | $25,000 |
| EEDA Foundation | $20,000 |
| Ichan School of Medicine | $15,000 |
| Water Mill Improvement Assoc | $15,000 |
| Sag Harbor Lions Club Pierson Schol | $14,000 |
| MET PGA Foundation | $11,000 |
| SNACK Friends | $11,000 |
| Tomorrows Hope Foundation | $10,000 |
| AJJ Scholarship Fund | $10,000 |
| Carmel Connection Foundation | $10,000 |
| Retreat Inc | $10,000 |
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 (FY21–25, $95k) land where the poverty rate runs at 8%, against an area that typically sits at 8%. 21% 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.
Which US states your grants reach
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 +7% since the first grant, against 0% for the ones you funded once.
25 repeat relationships — 21 still active in FY2025, 4 since wound down; 10 grantees were first funded in FY2025 (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 FY2025, 80% of grant dollars renewed an existing relationship; $96k 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
- TSTHE SOUTHAMPTON HOSPITAL FOUNDATION INC4× · 2021–2025 · $350k · revenue +215%
ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI4× · 2021–2025 · $70k · revenue +22%- NSNORTH SEA MARITIME CENTER INC2× · 2024–2025 · $62k · revenue +204%
Funded once
- ISIchan Schoold of Medicineone grant, 2024 · $20k
- WMWater Mill Improvements Assocone grant, 2024 · $10k
- WMWater Mill Museumgraduatedone grant, 2024 · $10k · revenue +36%
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.
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
The goals and objectives of the corporation are as follows:(a) to operate and maintain a nonsectarian, general hospital at one or more locations for the furnishing of inpatient, ambulatory, restorative, preventative and emergency medical…
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
We, at ch, humbly join together to bring christ's healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
North shore-lij occupational medicine, pc is part of northwell health, inc. ("northwell"), which strives to improve the health of the communities it serves and is committed to providing the highest quality clinical care; educating the…
Long island jewish medical center is part of the northwell health ("northwell"), which strives to improve the health of the communities it serves and is committed to providing the highest quality clinical care; educating the current and…
Long island partnership clt housing development fund company, inc. (lipclt) was established to provide housing within nassau and suffolk counties in new york for "persons of low income", as defined in any federal or state low income…
We, at ch, humbly join together to bring christs healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
We, at ch, humbly join together to bring christs healing mission and the mission of mercy of the catholic church expressed in catholic health care to our communities.
For reference, the grantee most central to the portfolio’s shape is Jewish Senior Life Foundation Inc and the most unlike its peers is Ajj Scholarship Fund Incorporated. 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 27 years old; the field is 16. You back the established end — and your money leans older still.
The field is 20% startups (under 5 years old) — 8% of your grantees by number, and just 5% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 11% 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.
28 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. 28 of the 55 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 THE SOUTHAMPTON HOSPITAL FOUNDATION INC ↗
- Who funds ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI ↗
- Who funds NORTH SEA MARITIME CENTER INC ↗
- Who funds ST FRANCIS HOSPITAL FOUNDATION INC ↗
- Who funds LEADERSHIP ROUNDTABLE INC ↗
- Who funds MYRIAD USA INC ↗
- Who funds SCO FAMILY OF SERVICES ↗
- Who funds CARMEL CONNECTION FOUNDATION INC ↗
- Who funds TOMORROW'S HOPE FOUNDATION INC ↗
- Who funds Childrens Oncology Services Inc ↗
- Who funds SNACK & FRIENDS INC ↗
- Who funds Retreat Inc ↗
- Who funds ROAD FORWARD SCHOLARSHIP FUND ↗
- Who funds ELEANOR WHITMORE EARLY CHILDHOOD CENTER INC ↗
- Who funds EAST ISLIP SOCCER CLUB ↗
- Who funds AJJ SCHOLARSHIP FUND INCORPORATED ↗
- Who funds Water Mill Museum ↗
- Who funds WATER MILL COMMUNITY CLUB INC ↗
- Who funds HAMPTONS COMMUNITY OUTREACH INC ↗
- Who funds PAN-MASSACHUSETTS CHALLENGE INC ↗
- Who funds 625 FOUNDATION ↗
- Who funds AMERICAN CANCER SOCIETY INC ↗
- Who funds LARCHE LONG ISLAND INC ↗
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: Halsey Family Foundation Inc · Yaffa Foundation Inc · The Goldman Sachs Charitable Gift Fund · The Reba Judith Sandler Foundation Inc · Alice and Jaclyn Houseknecht Foundation · The Donald and Barbara Zucker Family Foundation · Jewish Communal Fund · The New York Community Trust · National Philanthropic Trust · Morgan Stanley Global Impact Funding Trust Inc · The Bank of America Charitable Foundation Inc · Vanguard Charitable Endowment Program
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 Janet & Robert W Postma Foundation 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.
- Pan-Massachusetts Challenge Inc — 0% 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.