· Private foundation
The Tiedemann Foundation
Its FY2025 filing reports that it accepted unsolicited grant applications.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2020–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k13 grants · $32k
- $10k–50k6 grants · $76k
| Recipient | Amount |
|---|---|
| Concord Museum | $20,000 |
| Historic New England | $12,000 |
| Purdue Foundation | $12,000 |
| Virginia Tech | $12,000 |
| Peabody Essex Museum | $10,000 |
| Massachusetts Institute of Technology | $10,000 |
| Trustees of the Reservations | $5,000 |
| Maritime Museum of San Diego | $5,000 |
| Concord Land Conservation Trust | $4,000 |
| University of California San Diego | $3,000 |
| Folk Arts Center of New England | $3,000 |
| Concord Housing Foundation | $2,000 |
| Country Dance and Song Society | $2,000 |
| The Nature Conservancy | $2,000 |
| Peak House Heritage Center | $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.
Dollar for dollar, your grants (FY20–25) land where the poverty rate runs at 12%, against an area that typically sits at 8%. 99% 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 +35% since the first grant, against 0% for the ones you funded once.
15 repeat relationships — 14 still active in FY2025, 1 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, 92% of grant dollars renewed an existing relationship; $8k 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
- CACONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM6× · 2020–2025 · $85k · revenue +67%
- SFSOCIETY FOR THE PRESERVATION OF NEW ENGL6× · 2020–2025 · $39k · revenue +327%
- FAFOLK ARTS CENTER OF NEW ENGLAND INC6× · 2020–2025 · $18k · revenue +35%
Funded once
- APARCADIA PROJECTgraduatedone grant, 2023 · $8k · revenue +117%
- MMITone grant, 2020 · $7k
- FMFAIRBANKS MUSEUM & PLANETARIUMone grant, 2024 · $4k · 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.
Study, collect and preserve the history of Wayland, Massachusetts and its people: to preserve the building and the artifacts owned by the Society, and to disseminate information to promote the traditions and history or Wayland.
Museum and research library for history of fitchburg, massachusetts
The mission of the fitchburg art museum is to inspire creativity and learning, and to contribute to the well-being of our diverse communities in fitchburg, north central massachusetts, and new england. to accomplish the mission, we…
To encourage and assist in the acquisition, preservation and management of open space on cape cod
New england museum association's mission is to connect a community engaged in learning, collaboration, and action to cultivate a better museum world.
Historical preservation for the town of Penacook and restoration of historical buildings
To foster and encourage the study of Cambridge history, and to provide educational resources and programs for the benefit of the community.
For reference, the grantee most central to the portfolio’s shape is Society for the Preservation of New Engl and the most unlike its peers is Friends of the North Brookfield Town House. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
16 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. 16 of the 28 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 CONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM ↗
- Who funds SOCIETY FOR THE PRESERVATION OF NEW ENGL ↗
- Who funds PEABODY ESSEX MUSEUM INC ↗
- Who funds Massachusetts Institute of Technology ↗
- Who funds FRIENDS OF THE GUEST HOUSE INC ↗
- Who funds FOLK ARTS CENTER OF NEW ENGLAND INC ↗
- Who funds THE NATURE CONSERVANCY ↗
- Who funds COUNTRY DANCE AND SONG SOCIETY INC ↗
- Who funds ARCADIA PROJECT ↗
- Who funds CAMBRIA LIBRARY ASSOCIATION ↗
- Who funds CONCORD LAND CONSERVATION TRUST ↗
- Who funds FAIRBANKS MUSEUM & PLANETARIUM ↗
- Who funds REVERE AND SON HERITAGE TRUST CORPORATION ↗
- Who funds FRIENDS OF THE NORTH BROOKFIELD TOWN HOUSE ↗
- Who funds Concord Housing Foundation Inc ↗
- Who funds THE ESCONDIDO CREEK CONSERVANCY ↗
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: Vanguard Charitable Endowment Program · The Bank of America Charitable 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 Tiedemann 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.
- Massachusetts Institute of Technology — 35% of income from government
- Fairbanks Museum & Planetarium — 7% of income from government
- Revere and Son Heritage Trust Corporation — 4% of income from government
- Peabody Essex Museum Inc — 3% of income from government
- Society for the Preservation of New Engl — 2% of income from government
- Concord Antiquarian Society D/B/a Concord Museum — 1% 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 Tiedemann Foundation?
Find your warmest path to The Tiedemann 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.