· Private foundation
Sontag Foundation
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 FY2017–2024.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2024
- Under $10k5 grants · $23k
- $10k–50k6 grants · $211k
- $50k–250k18 grants · $2.4M
- $250k+6 grants · $4.5M
| Recipient | Amount |
|---|---|
| COMMUNITY FOUNDATION OF NE FL | $3,000,000 |
| BRIGHAM & WOMEN'S HOSPITAL | $362,500 |
| THE REGENTS OF THE UNIVERSITY OF MICHIGAN | $350,000 |
| MARK FOUNDATION FOR CANCER RESEARCH | $300,000 |
| BOSTON CHILDREN'S HOSPITAL | $262,500 |
| CALIFORNIA INSTITUTE OF TECHNOLOGY | $250,000 |
| REGENTS OF UNIV OF CA-SAN FRANCISCO | $187,500 |
| THE REGENTS OF UNIVERSITY OF CALIFORNIA | $150,000 |
| BAYLOR COLLEGE OF MEDICINE | $150,000 |
| YALE UNIVERSITY | $150,000 |
| UNIVERSITY OF TEXAS SOUTHWESTERN | $150,000 |
| MASSACHUSETTS INSTITUTE OF TECHNOLOGY | $150,000 |
| CHILDREN'S HOSPITAL OF PHILADELPHIA | $150,000 |
| UNIVERSITY OF MASSACHUSETTS MED SCHOOL | $150,000 |
| UNIVERSITY OF PITTSBURGH | $150,000 |
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 (FY23–23, $20k) land where the poverty rate runs at 11%, against an area that typically sits at 10%. 50% of those dollars go to grantees based in above-average-need neighborhoods. Your grants spread fairly evenly across need levels.
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 +31% since the first grant, against +6% for the ones you funded once.
46 repeat relationships — 28 still active in FY2024, 18 since wound down; 5 grantees were first funded in FY2024 (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 FY2024, 94% of grant dollars renewed an existing relationship; $383k 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
- TBTHE BRAIN TUMOR NETWORK INC3× · 2021–2023 · $1.6M · revenue +55% · 63% of their budget
- CICALIFORNIA INSTITUTE OF TECHNOLOGY7× · 2017–2024 · $1.3M · revenue +35%
DUKE UNIVERSITY7× · 2017–2024 · $985k · revenue +51%
Funded once
- PAPATIENT ADVOCATE FOUNDATIONone grant, 2020 · $200k · revenue -56%
- YUYALE UNIVERSITYone grant, 2020 · $150k
- CSCOLD SPRING HARBOR LABORATORYone grant, 2017 · $113k · revenue +9%
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.
The Academy's mission is to enhance member career fulfillment and promote brain health for all.
Leadership in the prevention, treatment, and cure of cancer through excellence, vision and cost effectiveness in patient care, outreach programs, research, and education.
Sanford burnham prebys medical discovery institute's mission is to advance the biomedical sciences by cultivating the next generation of scientific leaders, providing meaningful opportunities for researchers of all backgrounds to learn,…
For more than 125 years, the mission of the johns hopkins hospital has been to lead the world in the diagnosis and treatment of disease and to train tomorrow's great physicians, nurses and scientists. above all, we aim to provide the…
Our mission is to accelerate scientific progress, understand the root causes of disease, and narrow the gap between discoveries and impact on patients.
Operate a state-of-the-art, world-class genomic research center that creates and uses advanced genomics to understand the genetic basis of disease. for more information, see schedule o.
Asco association promotes the common business interests of its members by: (1) advocating for policies that improve the quality of cancer care; (2) maintaining the highest standards of oncology medical care through programs supporting…
Please see schedule o
Assist banner health complete its mission to make health care easier so life can be better by providing integrated & coordinated care & population health management.
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
The purposes of the laboratory are scientific, medical, charitable, and educational. our mission is to discover precise genomic solutions for disease and empower the biomedical community.
City of Hope's mission is to make hope a reality for all touched by cancer and diabetes. PLEASE SEE SCHEDULE O FOR A CONTINUATION OF OUR MISSION
For reference, the grantee most central to the portfolio’s shape is Pacific Neuroscience Institute Foundation and the most unlike its peers is William Marsh Rice University. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 34 years old; the field is 16. You back the established end — and your money leans older still.
The field is 22% 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.
42 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. 42 of the 77 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 BRAIN TUMOR NETWORK INC ↗
- Who funds CALIFORNIA INSTITUTE OF TECHNOLOGY ↗
- Who funds DUKE UNIVERSITY ↗
- Who funds Children's Hospital Corporation ↗
- Who funds HEALTH RESEARCH ALLIANCE INC ↗
- Who funds Dana-Farber Cancer Institute Inc ↗
- Who funds New York University ↗
- Who funds CHILDREN'S NATIONAL REHABILITATION AND SPECIALIZED CARE ↗
- Who funds Society for Neuro-Oncology ↗
- Who funds CONQUER CANCER FOUNDATION OF THE AMERICAN SOCIETY OF CLINICAL ONCOLOGY ↗
- Who funds William Marsh Rice University ↗
- Who funds UNIVERSITY OF PITTSBURGH ↗
- Who funds WESTJAX OUTREACH INC COMMUNITY HEALTH OUTREACH ↗
- Who funds THE MARK FOUNDATION FOR CANCER RESEARCH (US) LTD ↗
- Who funds Massachusetts Institute of Technology ↗
- Who funds Baylor College of Medicine ↗
- Who funds Cornell University ↗
- Who funds PATIENT ADVOCATE FOUNDATION ↗
- Who funds THE CHILDREN'S HOSPITAL OF PHILADELPHIA ↗
- Who funds American Association for Cancer Research 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: The Community Foundation for Northeast Florida Inc · United Way of Northeast Florida Inc · Jacksonville Jaguars Foundation Inc · Pga Tour Inc · The Jim Moran Foundation Inc · Blue Cross Blue Shield of Florida Foundation · The Thomas M and Irene Kirbo Charitable Foundation · Lucy Gooding Charitable Foundation Trust · Southern Baptist Hospital of Florida Inc · The Schultz Foundation Inc · Stellar Foundation · The Gate 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 Sontag 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, a single department, or state — and drag the year to watch it move.
- Massachusetts Institute of Technology — 35% of income from government
- Operation New Hope Inc — 13% of income from government
- Children's Hospital Corporation — 10% of income from government
- Dana-Farber Cancer Institute Inc — 7% of income from government
- Westjax Outreach Inc Community Health Outreach — 2% of income from government
- Pine Castle 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.
Warm introductions · Powered by PlinthPlus
How do I get to Sontag Foundation?
Find your warmest path to Sontag Foundation 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.