· Private foundation
The Heartstone 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 placed by its stated purpose and the recipient’s mission, by year — across FY2017–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- $10k–50k1 grant · $29k
- $50k–250k4 grants · $345k
- $250k+1 grant · $500k
| Recipient | Amount |
|---|---|
| AMERICAN FRIENDS OF MAGEN DAVID ADOM | $500,000 |
| CONCORD ACADEMY | $100,000 |
| THE BELMONT SCHOOL | $90,000 |
| EAGLE FOUNDATION OF MASSACHUSETTS | $85,000 |
| FIDELITY CHARITABLE | $69,601 |
| TEMPLE OHABEI SHALOM | $29,310 |
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.
Dollar for dollar, your grants (FY17–25) land where the poverty rate runs at 12%, against an area that typically sits at 8%. 65% of your 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 +18% since the first grant, against -15% for the ones you funded once.
5 repeat relationships — 2 still active in FY2025, 3 since wound down; 3 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, 24% of grant dollars renewed an existing relationship; $614k 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
- FHFACING HISTORY & OURSELVES INC4× · 2017–2020 · $1.0M · revenue +18%
- TFTHE FESSENDEN SCHOOL2× · 2021–2022 · $200k · revenue +36%
- TBTHE BEMENT SCHOOL INC2× · 2024–2025 · $175k · revenue +11%
Funded once
- CHChildren's Hospital Corporationgraduatedone grant, 2018 · $813k · revenue +57%
- MDMAGEN DAVID ADOMone grant, 2023 · $500k
- FOFRIENDS OF UNITED HATZALAH INCone grant, 2023 · $500k · revenue -45%
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.
Capitol Hill Day School is a co-educational independent school serving students from pre-kindergarten through 8th grade. Capitol Hill Day School deeply engages a diverse community of students in connecting the classroom with the larger…
Northfield mount hermon educates the head, heart and hands of our students. we engage their intellect, compassion, and talents, empowering them to act with humanity and purpose.
The philadelphia school educates children for a future that is impossible to know but not impossible to shape. learn here. go anywhere.
We take a joyful, community-oriented approach to raising engaged citizens, deep learners, and brave adventurers with the skills, creativity, and heart needed to better the world.
At san francisco friends school, students learn in a community grounded in the quaker values of reflection, integrity, peaceful problem-solving and stewardship. our teachers challenge students with a dynamic curriculum that inspires…
Bullis school provides a student-centered balanced experience in academics, arts, athletics and community service. bullis uniquely prepares all students to become caring citizens and creative, critical thinkers who will thrive in…
The institution provides educational instruction and activities to students ranging from preschool through 8th grade.
In educating the whole child, eton school inspires creative, confident thinkers who have an enduring passion for learning and are poised to contribute to the world.
Deerfield academy is an independent secondary school committed to high standards of scholarship, citizenship, and personal responsibility. through a rigorous liberal arts curriculum, extensive co-curricular program, and supportive…
We engage a diverse community of learners in a collaborative educational experience, preparing them for college success and a lifetime of meaningful engagement with the broader world.
A pre-kindergarten through grade 8 independent school committed to academic excellence and the joy of childhood, fostering intellectual curiosity, critical thinking, and the development of the whole child.
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
For reference, the grantee most central to the portfolio’s shape is The Fessenden School and the most unlike its peers is Friends of United Hatzalah Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
10 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. 10 of the 14 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 FACING HISTORY & OURSELVES INC ↗
- Who funds Children's Hospital Corporation ↗
- Who funds FIDELITY INVESTMENTS CHARITABLE GIFT FUND ↗
- Who funds AMERICAN FRIENDS OF MAGEN DAVID ADOM ↗
- Who funds FRIENDS OF UNITED HATZALAH INC ↗
- Who funds CONCORD ACADEMY ↗
- Who funds THE FESSENDEN SCHOOL ↗
- Who funds THE BEMENT SCHOOL INC ↗
- Who funds THE CHESTNUT HILL SCHOOL ↗
- Who funds EAGLE HILL FOUNDATION OF MASSACHUSETTSINC ↗
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: Fidelity Foundation · The Pfizer Foundation Inc · National Philanthropic Trust · Vanguard Charitable Endowment Program · 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 The Heartstone 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.
- Children's Hospital Corporation — 10% of income from government
- The Fessenden School — 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 The Heartstone Foundation?
Find your warmest path to The Heartstone 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.