· Private foundation
Tamarack 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
- Under $10k53 grants · $79k
- $10k–50k4 grants · $65k
| Recipient | Amount |
|---|---|
| ST JOHN THE BAPTIST PARISH | $20,000 |
| CHABAD LUBAVITCH | $18,000 |
| BOSTON SYMPHONY ORCHESTRA | $17,000 |
| FNE INTERNATIONAL | $10,000 |
| GIRL'S INC LYNN | $6,500 |
| SWAMPSCOTT TIDES | $5,000 |
| WGBH CHANNEL 2 | $5,000 |
| MCLEAN HOSPITAL | $4,000 |
| WALDORF SCHOOL AT MORAINE FARM | $3,000 |
| UNITARIAN UNIVERSALIST CHURCH OF GREATER LYNN | $2,500 |
| CIRCLE OF CONCERN | $2,000 |
| LIFEBRIDGE NORTHSHORE | $2,000 |
| BOSTON CHONG DE CULTURAL ED TEMPLE | $2,000 |
| Individual grant recipient | $2,000 |
| OPERATION FOOD SEARCH | $2,000 |
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 (FY17–25, $97k) land where the poverty rate runs at 13%, against an area that typically sits at 10%. 70% 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.
Which US states your grants reach
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.
70 repeat relationships — 43 still active in FY2025, 27 since wound down; 9 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, 89% of grant dollars renewed an existing relationship; $17k 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
- FIFNE INTERNATIONAL INC6× · 2020–2025 · $60k · revenue +0%
GIRLS INCORPORATED OF BOSTON AND LYNN4× · 2022–2025 · $27k · revenue +41%- BSBOSTON SYMPHONY ORCHESTRA INC9× · 2017–2025 · $22k · revenue +38%
Funded once
- IGIndividual grant recipientone grant, 2024 · $8k
- AAALS ASSOCIATIONone grant, 2018 · $5k
- BCBowdoin Collegegraduatedone grant, 2018 · $5k · revenue +89%
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 bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
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.
Northeast college of health sciences (the college) is committed to academic excellence, leadership, and professional best practices in the health sciences.
The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…
The organization's mission is to conserve and promote new england's native plants to ensure healthy, biologically diverse landscapes.
Provide an independent forum for those who dare to read, think, speak, and write to advance the professional, literary, and scientific understanding of sea power and other issues critical to global security.
The primary mission of furman as a liberal arts institution is to provide a distinctive education in fine arts, humanities, social sciences, mathematics and the sciences, as well as selected professional disciplines.
Bates is a college of the liberal arts and sciences, and is a coeducational, nonsectarian, residential college with special commitments to academic rigor, and to assuring in all of its efforts the dignity of each individual, and access to…
The purpose of the water research foundation (wrf) is a definitive research organization to advance the science of all things water to better meet the evolving needs of its subscribers and the water sector. to engage exclusively in…
Eastern national promotes the public's understanding and support of america's national parks and other public trust partners by providing quality educational experiences, products and services.
Wentworth institute of technology is a nationally recognized private coeducational and residential university of higher education with a mission to empower, inspire and innovate through experiential learning with a core purpose of career…
Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…
For reference, the grantee most central to the portfolio’s shape is Epworth Children & Family Services Inc and the most unlike its peers is The Serengeti Foundation. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 60 years old; the field is 17. You back the established end — and your money leans older still.
The field is 20% startups (under 5 years old) — 3% of your grantees by number, and just 1% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 11% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
56 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. 56 of the 108 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 FNE INTERNATIONAL INC ↗
- Who funds UNCORNERED INC ↗
- Who funds GIRLS INCORPORATED OF BOSTON AND LYNN ↗
- Who funds BOSTON SYMPHONY ORCHESTRA INC ↗
- Who funds OPERATION FOOD SEARCH INC ↗
- Who funds CIRCLE OF CONCERN ↗
- Who funds FAMILY & CHILDREN'S SERVICE OF GREATER LYNN INC ↗
- Who funds HUMANE SOCIETY OF MISSOURI ↗
- Who funds THE LOWELL WHITEMAN SCHOOL ↗
- Who funds WALDORF SCHOOL AT MORAINE FARM INC ↗
- Who funds MISSOURI BOTANICAL GARDEN BOARD OF TRUSTEES ↗
- Who funds American National Red Cross & Its Constituent Chapters and Branches ↗
- Who funds MID-ATLANTIC PATHWORK INC ↗
- Who funds SIMMONS UNIVERSITY ↗
- Who funds THE PINGREE SCHOOL INC ↗
- Who funds PLUMMER YOUTH PROMISE INC ↗
- Who funds Bowdoin College ↗
- Who funds Swampscott Tides Inc ↗
- Who funds THE SERENGETI FOUNDATION ↗
- Who funds Lift Up of Routt County ↗
- Who funds UNITED WAY OF THE YAMPA VALLEY ↗
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: Eastern Bank Foundation · Boston Foundation Inc · Essex County Community Foundation Inc · Craig-Scheckman Family Foundation · Institution for Savings in Newburyport & Its Vicinity Charitable Foundation Inc · Cummings Foundation Grants Inc (Fka Oneworld Boston Inc) · Fidelity Foundation · Colorado Gives Foundation · Hurdle Hill Foundation · Salem Five Charitable Foundation Inc · Alfred Chase Charity Fdn Ui · The Coughlin Family Trust
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 Tamarack 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.
- Plummer Youth Promise Inc — 64% of income from government
- Woods Hole Oceanographic Institution — 63% of income from government
- Girls Incorporated of Boston and Lynn — 28% of income from government
- Uncornered Inc — 24% of income from government
- United Way of Massachusetts Bay Inc — 23% of income from government
- Care Dimensions Inc — 14% of income from government
- Trustees of Boston University — 12% of income from government
- The Salem Mission Inc — 4% of income from government
- Peabody Essex Museum Inc — 3% of income from government
- The Trustees of Reservations — 2% of income from government
- New England Conservatory of Music — 1% of income from government
- Simmons University — 1% of income from government
- Boston Symphony Orchestra Inc — 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 Tamarack Foundation?
Find your warmest path to Tamarack 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.