· Private foundation
Sound Foundation Inc
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
- Under $10k3 grants · $14k
- $10k–50k2 grants · $47k
| Recipient | Amount |
|---|---|
| OAK BLUFFS ELEMENTARY SCHOOL | $26,137 |
| MARTHA'S VINEYARD REGIONAL HIGH SCHOOL | $21,091 |
| ISLAND AUTISM GROUP | $9,000 |
| WEST TISBURY LIBRARY | $3,700 |
| ISLAND CHILDREN'S SCHOOL | $1,360 |
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 (FY21–23, $30k) land where the poverty rate runs at 14%, against an area that typically sits at 12%. 100% 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.
14 repeat relationships — 4 still active in FY2025, 10 since wound down; 1 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, 94% of grant dollars renewed an existing relationship; $4k 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
- IAISLAND AUTISM GROUP INC2× · 2023–2025 · $19k · revenue +59%
- FOFRIENDS OF CHILMARK PRE-SCHOOL INC2× · 2023–2024 · $5k · revenue +409%
- ICISLAND CHILDREN'S SCHOOL INC2× · 2019–2025 · $2k · revenue +30%
Funded once
- TUTHE UNIVERSITY OF OXFORDone grant, 2021 · $30k
- HSHIGH SCHOOLone grant, 2019 · $10k
- VCVINEYARD CONSERVATION SOCIETY INCone grant, 2020 · $5k · revenue +0%
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.
Our mission at Island Montessori School is to create a Montessori community that respects each child as an individual and fosters in each student respect for self and others, joy in discovery, independence, communal responsibility, and a…
Private elementary school
Child advocacy and educational programs for preschool aged children.
Preschool, day care service
The Virgin Islands Montessori School and Peter Gruber International Academy is committed providing an Education for Life, consistent with Montessori principles, reflecting the richess of our diverse culture and upholding international…
Our mission is that amelia island montessori embodies a child-centered education, grounded in montessori philosophy and methodology, that supports the whole child, inspiring independent thinkers and cultivating collaborative citizens.
Montessori education for ages 3 to 6 for 9 months yearly
Our mission is to spark wonder and intellectual curiosity in each child. We achieve this through a purposeful blend of:Engaging academics custom-tailored to each child's abilities, strengths and interests;An unparalleled social-emotional…
Lexington montessori school builds an inclusive, joyful community that ignites self-discovery through purposeful learning, inspiring children to embrace and challenge the world with compassion, resilience and courage.
Mississsippi valley montessori provides an authentic montessori environment for children rooted in the fundamental tenets of the montessori three-year model.
Education as per montessori philosophy
The school's primary goal is to be an experiment in a new learning environment, blurring the boundaries between home-school and institutional schooling, between scientists and teachers, between schools and the neighborhoods around them.
For reference, the grantee most central to the portfolio’s shape is Vineyard Montessori School Inc and the most unlike its peers is Island Children's School Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
8 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. 8 of the 23 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 EQUAL JUSTICE INITIATIVE ↗
- Who funds SIMA STUDIOS ↗
- Who funds ISLAND AUTISM GROUP INC ↗
- Who funds FRIENDS OF CHILMARK PRE-SCHOOL INC ↗
- Who funds VINEYARD CONSERVATION SOCIETY INC ↗
- Who funds MISTY MEADOWS EQUINE LEARNING CENTER INC ↗
- Who funds ISLAND CHILDREN'S SCHOOL INC ↗
- Who funds VINEYARD MONTESSORI SCHOOL 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 Peter and Elizabeth C Tower Foundation · Slough Farm Foundation · South Mountain Company Foundation · Martha's Vineyard Bank Charitable Foundation Inc · The Ayco Charitable Foundation · National Philanthropic Trust · 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 Sound 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 or a single department — and drag the year to watch it move.
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 Sound Foundation Inc?
Find your warmest path to Sound 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.