· 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 it funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.
Where the money goes
Grants by size, and the largest recipients.
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 |
Does the money reach high-need areas?
Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.
Dollar for dollar, its grants (FY17–25) land where the poverty rate runs at 12%, against an area that typically sits at 8%. 65% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.
How this is measured
How this is measured
Who it funds again
Organizations funded in more than one year, against those funded once.
Grantees it renews have grown median revenue +18% since the first grant, against -15% for those 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
How this is measured
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 +78%
- FOFRIENDS OF UNITED HATZALAH INCone grant, 2023 · $500k · revenue -45%
- MDMAGEN DAVID ADOMone grant, 2023 · $500k
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.
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.
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.
How this is measured
10 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. 10 of the 14 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.
Where the money sits, by cause and then by grantee
Each grantee by its size and the funder’s share of it; top left is load-bearing
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 FACING HISTORY & OURSELVES INC ↗
- Who funds Children's Hospital Corporation ↗
- Who funds FIDELITY INVESTMENTS CHARITABLE GIFT FUND ↗
- Who funds FRIENDS OF UNITED HATZALAH INC ↗
- Who funds AMERICAN FRIENDS OF MAGEN DAVID ADOM ↗
- 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 ↗
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.
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
How this is measured
How much its grantees rely on government
Each dot is one organization The Heartstone Foundation funds: left to right is the share of its income from government, bottom to top the share from The Heartstone Foundation. Bigger dots raise more.
- Children's Hospital Corporation: 10% of income from government
- The Fessenden School: 0% of income from government
How this is measured
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.
Play a game based on Heartstone’s filings →