· 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 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
- 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 |
Does the money reach high-need areas?
Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.
Its 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 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.
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
How this is measured
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%
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.
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.
How this is measured
8 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. 8 of the 23 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 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 ↗
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: 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
How this is measured
How much its grantees rely on government
Each dot is one organization Sound Foundation Inc funds: left to right is the share of its income from government, bottom to top the share from Sound Foundation Inc. Bigger dots raise more.
How this is measured
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.
Play a game based on Sound’s filings →