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Janet & Robert W Postma Foundation at a glance

· 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.

$469k
Granted FY2025still arriving
31
Grants FY2025still arriving
7
States reached
$100k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
01What it funds
0198% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2021 to 2025.

Health$512kArts & Culture$153kPhilanthropy$146kEducation$109kRecreation & Sports$104kHuman Services$81kReligion$56kInternational$50kOther$0
02FY2025 · 31 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k15 grants · $56k
  • $10k–50k12 grants · $161k
  • $50k–250k4 grants · $253k
$10,000
Median grant
7
States reached
$4.1M
Total assets
Largest grants
RecipientAmount
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
Water Mill Improvement Assoc$15,000
Ichan School of Medicine$15,000
Sag Harbor Lions Club Pierson Schol$14,000
MET PGA Foundation$11,000
SNACK Friends$11,000
AJJ Scholarship Fund$10,000
Retreat Inc$10,000
Carmel Connection Foundation$10,000
Camp One Step$10,000
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Its 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. Its grants skew toward lower-need ZIPs.

area typical 8%SNACK & FRIENDS: $15k → 17%Retreat Inc: $10k → 7%SCO Family of Services: $8k → 6%Eleanor Whitmore Early Childhood Ce: $9k → 7%SNACK & FRIENDS: $3k → 17%SCO Family of Services: $8k → 6%Retreat Inc: $5k → 7%SNACK & FRIENDS: $2k → 17%ELEANOR WHITEMORE EARLY CHILDHOOD CENTER: $3k → 7%SCO FAMILY OF SERVICES: $11k → 6%ELEANOR WHITEMORE EARLY CHILDHOOD CENTER: $3k → 7%SCO FAMILY OF SERVICES: $10k → 6%SCO FAMILY OF SERVICES: $9k → 6%RETREAT INC: $500 → 7%Development Disabilities Institute: $1k → 7%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.

Which US states its grants reach

VT
IL
NY
MA
PA
NJ
DC
GA
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

85%of every dollar goes to organizations it has funded before.
$1.0M · 25 repeat orgs$178k to everyone else

Grantees it renews have grown median revenue +7% since the first grant, against 0% for those 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

Re-uppedFunded once

Organizations

25
19

Total granted

$1.0M
$82k

Median revenue growth · since first grant

+7%
0%

Still filing today

72%
26%

New vs renewed · share of each year

In FY2025, 80% of grant dollars renewed an existing relationship; $96k went to new ones.

50%100%’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’21’22’23’24’25
EducationHuman ServicesArts & CultureHealthAnimalsPhilanthropyOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). 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

  • TS
    THE SOUTHAMPTON HOSPITAL FOUNDATION INC
    4× · 2021–2025 · $350k · revenue +215%
  • ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
    4× · 2021–2025 · $70k · revenue +22%
  • NS
    NORTH SEA MARITIME CENTER INC
    2× · 2024–2025 · $62k · revenue +204%

Funded once

  • IS
    Ichan Schoold of Medicine
    one grant, 2024 · $20k
  • WM
    WATER MILL COMMUNITY CLUB INC
    one grant, 2024 · $10k · revenue 0%
  • WM
    Water Mill Museumgraduated
    one grant, 2024 · $10k · revenue +36%
How this is measured

Repeat means funded in two or more distinct years. Growth and survival are read from each grantee’s own subsequent IRS filings.

04Its field

Closest unfunded matches

The nonprofits that most resemble its grantees but are not funded by it, scored along the direction from the rest of the field toward the portfolio. A resemblance in what they say they do, not a recommendation.

1
St Charles Hospital Corp

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.

Health
2
Wsnchs North Inc

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.

Health
3
St Catherine of Siena Medical Center

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.

Health
4
St Charles Hospital Foundation

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.

—
5
Long Island Community Hospital At Nyu Langone Health

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…

—
6
Chs Services Inc

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.

—
7
Nursing Sisters Home Care Inc

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.

Health
8
North Shore-Lij Occupational Medicine Pc

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…

Health
9
Long Island Jewish Medical Center

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…

Health
10
Long Island Partnership Clt Housing Development Fund Company Inc

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…

Housing & Shelter
11
Good Samaritan Hospital Medical Center

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.

Health
12
Our Lady of Consolation Geriatric Care Center

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.

Health
How this is measured
The grantee most central to the portfolio’s shape is Jewish Senior Life Foundation Inc; 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.
04the grantee network

28 grantees tracked through their own filings, 2017–2025.

Each grant beside the grantee’s revenue from every source, year by year.

How this is measured

Counted here: distinct organizations funded across 2017 to 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.

Each grantee is resolved to its own IRS returns. Association, dated; never a causal claim.

0
Load-bearing (≥25% of a budget)
8
Early backer (in before they grew)
28/28
Grantees still filing
15/28
Grew since first funded

Where the money sits, by cause and then by grantee

THE SOUTHAMPTON HOSPITAL FOUNDATION INC: $350,000 · HealthTHE SOUTHAMPTON HOSPITAL FOUNDATION IN…ST FRANCIS HOSPITAL FOUNDATION INC: $60,700 · HealthST FRANCIS HOSPITAL FOUNDATION INCChildrens Oncology Services Inc: $20,000 · Health+1 more: $3,190 · HealthCMTA: $125,000 · OtherCMTAHSS Foundation: $51,000 · OtherHSS FoundationMET PGA Foundation: $35,250 · OtherMET PGA FoundationSag Harbor Lions Club Pierson Schol: $34,000 · OtherSag Harbor Lions Club Pierson ScholEEDA Foundation: $25,000 · OtherEEDA FoundationTOMORROW'S HOPE FOUNDATION INC: $22,500 · OtherIchan Schoold of Medicine: $20,000 · OtherWater Mill Improvement Assoc: $15,000 · Other+25 more: $103,200 · Other+25 moreICAHN SCHOOL OF MEDICINE AT MOUNT SINAI: $70,000 · EducationICAHN SCHOOL OF…LEADERSHIP ROUNDTABLE INC: $55,000 · EducationLEADERSHIP ROUN…CARMEL CONNECTION FOUNDATION INC: $25,000 · EducationCARMEL CONNECTI…ROAD FORWARD SCHOLARSHIP FUND: $15,000 · EducationROAD FORWARD SC…AJJ SCHOLARSHIP FUND INCORPORATED: $10,000 · EducationAJJ SCHOLARSHIP…+1 more: $3,450 · EducationSCO FAMILY OF SERVICES: $45,250 · Human ServicesSNACK & FRIENDS INC: $19,500 · Human ServicesRetreat Inc: $15,500 · Human ServicesELEANOR WHITMORE EARLY CHILDHOOD CENTER INC: $13,500 · Human Services+1 more: $1,000 · Human ServicesNORTH SEA MARITIME CENTER INC: $61,500 · Arts & CultureWater Mill Museum: $10,000 · Arts & CultureHAMPTONS COMMUNITY OUTREACH INC: $5,000 · Arts & Culture+2 more: $1,500 · Arts & CultureMYRIAD USA INC: $50,000 · InternationalLARCHE LONG ISLAND INC: $2,500 · Housing & Shelter
Health$433,890Other$430,950Education$178,450Human Services$94,750Arts & Culture$78,000International$50,000Housing & Shelter$2,500

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetTHE SOUTHAMPTON HOSPITAL FOUNDATION INC: $350,000 over 4y, 0.8% of budgetICAHN SCHOOL OF MEDICINE AT MOUNT SINAI: $70,000 over 4y, 0.0% of budgetNORTH SEA MARITIME CENTER INC: $61,500 over 2y, 21% of budgetST FRANCIS HOSPITAL FOUNDATION INC: $60,700 over 4y, 0.1% of budgetLEADERSHIP ROUNDTABLE INC: $55,000 over 2y, 0.2% of budgetMYRIAD USA INC: $50,000 over 1y, 0.0% of budgetSCO FAMILY OF SERVICES: $45,250 over 5y, 0.0% of budgetCARMEL CONNECTION FOUNDATION INC: $25,000 over 2y, 8.7% of budgetTOMORROW'S HOPE FOUNDATION INC: $22,500 over 3y, 11% of budgetChildrens Oncology Services Inc: $20,000 over 3y, 0.1% of budgetSNACK & FRIENDS INC: $19,500 over 3y, 1.0% of budgetRetreat Inc: $15,500 over 3y, 0.1% of budgetROAD FORWARD SCHOLARSHIP FUND: $15,000 over 2y, 3.4% of budgetELEANOR WHITMORE EARLY CHILDHOOD CENTER INC: $13,500 over 3y, 0.1% of budgetWATER MILL COMMUNITY CLUB INC: $10,000 over 1y, 4.8% of budgetEAST ISLIP SOCCER CLUB: $10,000 over 3y, 0.2% of budgetWater Mill Museum: $10,000 over 1y, 8.3% of budgetHAMPTONS COMMUNITY OUTREACH INC: $5,000 over 1y, 0.1% of budgetPAN-MASSACHUSETTS CHALLENGE INC: $3,500 over 2y, 0.0% of budget625 FOUNDATION: $3,450 over 4y, 3.7% of budgetAMERICAN CANCER SOCIETY INC: $3,190 over 2y, 0.0% of budgetEvelyn Alexander Wildlife Rescue Center Inc: $2,000 over 3y, 0.1% of budgetDEVELOPMENTAL DISABILITIES INSTITUTE INC: $1,000 over 1y, 0.0% of budgetJEWISH SENIOR LIFE FOUNDATION INC: $250 over 1y, 0.0% of budget
Grantee by grantee: a decade per organization, before and after funding

A decade per grantee: revenue shaded, 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 AJJ SCHOLARSHIP FUND INCORPORATED ↗
  • Who funds WATER MILL COMMUNITY CLUB INC ↗
  • Who funds EAST ISLIP SOCCER CLUB ↗
  • Who funds Water Mill Museum ↗
  • Who funds HAMPTONS COMMUNITY OUTREACH INC ↗
  • Who funds PAN-MASSACHUSETTS CHALLENGE INC ↗
  • Who funds 625 FOUNDATION ↗
  • Who funds AMERICAN CANCER SOCIETY INC ↗

Co-funders

Grantmakers whose grantees overlap with this funder’s far more than size alone predicts. Closer means stronger alignment; arcs show where they also fund each other. Here they form a tightly interlocked group: most of these funders back each other's grantees too.

Halsey Family Foundat…Yaffa Foundation IncThe Goldman Sachs Cha…The Reba Judith Sandl…Alice and Jaclyn Hous…The Donald and Barbar…Jewish Communal FundThe New York Communit…National Philanthropi…Morgan Stanley Global…The Bank of America C…Vanguard Charitable E…
Halsey Family Foundation IncNY17.9× affinity6 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

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

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization Janet & Robert W Postma Foundation funds: left to right is the share of its income from government, bottom to top the share from Janet & Robert W Postma Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 20%2%6%14%25%funder's share of their income ↑0%10%20%30%40%share of the org’s income from government →median 0%
  • Pan-Massachusetts Challenge Inc: 0% of income from government
no gov moneyreceives it· size = income
2get no government money at all
7report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–40%
typical government reliance, FY20–25
How this is measured
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 a grant caused the public funding. Coverage is precision-first, a floor rather than 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 to 24 months.

On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 55 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

How this is measured
Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

Play a game based on Janet & Robert W Postma’s filings →

More from the funding graph

The unnamed billions
grants reported with no recipient in the public record
The regranting layer
51% of grant dollars land in the regranting layer
The DAF merry-go-round
$9.7B circulates between donor-advised funds
The endowment market
who holds foundation money, and what just moved
The camps
funders cluster by geography, not ideology
By state
where grant money is based, and what stays home