· Private foundation
Stephen Mack & Kelly Mack Foundation Inc
Its FY2024 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 placed by its stated purpose and the recipient’s mission, by year — across FY2021–2024.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2024
- Under $10k3 grants · $11k
- $10k–50k1 grant · $10k
- $50k–250k3 grants · $260k
- $250k+3 grants · $805k
| Recipient | Amount |
|---|---|
| NYU | $305,000 |
| MUSICIANS ON CALL | $250,000 |
| NYU LANGONE HEALTH | $250,000 |
| 92Y | $122,667 |
| GEORGETOWN UNIVERSITY | $87,500 |
| RIVERDALE COUNTRY SCHOOL | $50,000 |
| THE SCHWARZMAN ANIMAL MEDICAL CENTER | $10,000 |
| BOSTON CHILDREN'S HOSPITAL TRUST | $7,500 |
| ATLANTIC GOLF CLUB EDUCATIONAL FUND | $1,500 |
| LUSTGARTEN FOUNDATION | $1,500 |
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 (FY21–24, $113k) land where the poverty rate runs at 16%, against an area that typically sits at 10%. 99% of those dollars go to grantees based in above-average-need neighborhoods. Most of your grants land in higher-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 +19% since the first grant, against +19% for the ones you funded once.
10 repeat relationships — 8 still active in FY2024, 2 since wound down; 2 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, 100% of grant dollars renewed an existing relationship; $3k 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
- MOMUSICIANS ON CALL INC3× · 2021–2024 · $500k · revenue +30%
GEORGETOWN UNIVERSITY2× · 2023–2024 · $238k · revenue +19%- RCRIVERDALE COUNTRY SCHOOL INC2× · 2023–2024 · $75k · revenue +9%
Funded once
- SDSTEPHEN D HASSENFELD CHILDREN'S CENTERone grant, 2021 · $412k
- AFAmerican Friends Of Or National Missionsone grant, 2023 · $100k · revenue +126%
- TTTHE TOM COUGHLIN JAY FUND FOUNDATION INCgraduatedone grant, 2021 · $13k · revenue +130%
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 children's hospital of philadelphia, the oldest hospital in the united states dedicated exclusively to pediatrics, strives to be the world leader in the advancement of health care for children by integrating excellent patient care,…
The mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.
Nyu is a private university with approximately 60,000 matriculating students in 20 schools and institutes. nyu's primary missions are education, research and scholarship, and patient care.
We champion the health needs of children and families. we are committed to improving children's health by providing the highest-quality, family centered care, advanced through research and education.
Aamc leads & serves the academic medicine community to improve the health of people everywhere.
See schedule o:asco is a professional oncology society committed to conquering cancer through research, education, and promotion of the highest quality patient care.
Leadership in the prevention, treatment, and cure of cancer through excellence, vision and cost effectiveness in patient care, outreach programs, research, and education.
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…
Enhance the ability of actec members to provide the most efficient and highest quality services to their clients; develop qualified trust and estate counselors; improve and reform probate, trust and tax laws, procedures, and standards of…
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,…
The central mission of the university of southern california is the development of human beings and society as a whole through the cultivation and enrichment of the human mind and spirit. the principal means by which our mission is…
For reference, the grantee most central to the portfolio’s shape is Team Impact Inc and the most unlike its peers is Home Stretch Farm and Sanctuary. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
16 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. 16 of the 21 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 MONTEREY PENINSULA FOUNDATION ↗
- Who funds MUSICIANS ON CALL INC ↗
- Who funds GEORGETOWN UNIVERSITY ↗
- Who funds American Friends Of Or National Missions ↗
- Who funds RIVERDALE COUNTRY SCHOOL INC ↗
- Who funds TEAM IMPACT INC ↗
- Who funds CHARITIES AID FOUNDATION AMERICA ↗
- Who funds THE ANIMAL MEDICAL CENTER ↗
- Who funds Children's Hospital Corporation ↗
- Who funds THE TOM COUGHLIN JAY FUND FOUNDATION INC ↗
- Who funds CHALLENGED ATHLETES INC ↗
- Who funds HOME STRETCH FARM AND SANCTUARY ↗
- Who funds CITYMEALS-ON-WHEELS ↗
- Who funds MARC LUSTGARTEN PANCREATIC CANCER FOUNDATION ↗
- Who funds ATLANTIC GOLF CLUB EDUCATIONAL FUND INC ↗
- Who funds VISTA DEL MAR CHILD AND FAMILY SERVICES ↗
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: American Online Giving Foundation Inc · Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile Foundation
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 Stephen Mack & Kelly Mack Foundation Inc 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.
- Children's Hospital Corporation — 10% 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 Stephen Mack & Kelly Mack Foundation Inc?
Find your warmest path to Stephen Mack & Kelly Mack Foundation Inc 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.