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The Tiedemann Foundation at a glance

· Private foundation

The Tiedemann Foundation

Its FY2025 filing reports that it accepted unsolicited grant applications.

$108k
Granted FY2025still arriving
19
Grants FY2025still arriving
5
States reached
$20k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0196% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2020 to 2025.

Arts & Culture$238kEducation$148kScience & Tech$36kEnvironment$35kCrime & Legal$20kHousing & Shelter$2kOther$0
02FY2025 · 19 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k13 grants · $32k
  • $10k–50k6 grants · $76k
$3,000
Median grant
5
States reached
$631k
Total assets
Largest grants
RecipientAmount
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
02The need
03

Does the money reach high-need areas?

Each grant placed by the hardship in its grantee’s ZIP, against the area’s typical level.

show:

Dollar for dollar, its grants (FY20–25) land where the poverty rate runs at 12%, against an area that typically sits at 8%. 99% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 8%Revere and Son Heritage Trust Corporation: $3k → 7%Concord Museum: $25k → 8%Historic New England: $12k → 10%Historic New England: $5k → 16%University of California San Diego: $25k → 11%Purdue Foundation: $12k → 19%Friends of Guest House: $8k → 9%Virginia Tech: $12k → 21%Concord Museum: $20k → 8%Historic New England: $5k → 10%University of California San Diego: $24k → 11%Purdue Foundation: $7k → 19%Friends of Guest House Inc: $8k → 9%Virginia Tech: $7k → 21%Concord Museum: $13k → 8%Historic New England: $5k → 10%Trustees of the Reservations: $5k → 16%University of California San Diego: $3k → 11%Purdue Foundation: $5k → 19%Virginia Tech: $6k → 21%The Concord Bridge: $12k → 8%Historic New England: $5k → 10%Trustees of the Reservations: $3k → 16%Purdue Foundation: $5k → 19%Virginia Tech: $6k → 21%Concord Museum: $10k → 8%Historic New England: $5k → 10%Trustees of the Reservations: $3k → 16%Maritime Museum of San Diego: $5k → 11%Purdue University: $5k → 19%Virginia Tech: $6k → 21%Concord Museum: $9k → 8%Trustees of the Reservations: $3k → 16%Maritime Museum of San Diego: $3k → 11%Purdue University: $5k → 19%Virginia Tech: $6k → 21%Concord Museum: $8k → 8%Maritime Museum of San Diego: $3k → 11%Concord Land Conservation Trust: $4k → 8%Maritime Museum of San Diego: $3k → 11%Peabody Essex Museum: $10k → 10%Peabody Essex Museum: $8k → 10%Peabody Essex Museum: $5k → 10%Peabody Essex Museum: $5k → 10%Peabody Essex Museum: $5k → 10%Peabody-Essex Museum: $5k → 10%MIT: $7k → 8%Massachusetts Institute of Technolo: $7k → 8%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount
How this is measured
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty line in the grantee’s ZIP, averaged from the tracts in that ZIP.
How this is measured
US grants placed by each grantee’s ZIP, which can differ from where services are delivered. Need from public data (U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA), shown as context about the area, never attributed to the funder’s giving.
03Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

92%of every dollar goes to organizations it has funded before.
$408k · 15 repeat orgs$36k to everyone else

Grantees it renews have grown median revenue +35% since the first grant, against 0% for those 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

Re-uppedFunded once

Organizations

15
8

Total granted

$408k
$28k

Median revenue growth · since first grant

+35%
0%

Still filing today

47%
63%

New vs renewed · share of each year

In FY2025, 92% of grant dollars renewed an existing relationship; $8k went to new ones.

50%100%’20’21’22’23’24’25
RenewedFirst-time

Where new relationships form · theme of each grantee’s first grant

’20’21’22’23’24’25
Arts & CultureEnvironmentHealthHousing & ShelterOther
How this is measured
First-time means a grantee’s first year in the filing window; renewed means funded in an earlier year too. The renewed share climbs naturally as a portfolio matures, so the signal is a year that bucks it (a wave of new grantees). 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

  • CA
    CONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM
    6× · 2020–2025 · $85k · revenue +146%
  • SF
    SOCIETY FOR THE PRESERVATION OF NEW ENGL
    6× · 2020–2025 · $39k · revenue +327%
  • FA
    FOLK ARTS CENTER OF NEW ENGLAND INC
    6× · 2020–2025 · $18k · revenue +35%

Funded once

  • AP
    ARCADIA PROJECTgraduated
    one grant, 2023 · $8k · revenue +117%
  • M
    MIT
    one grant, 2020 · $7k
  • FM
    FAIRBANKS MUSEUM & PLANETARIUM
    one grant, 2024 · $4k · 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.

04Its field

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.

1
Cohasset Conservation Trust Inc
—
2
Massachusetts Outdoor Heritage Foundation Inc Attn Susan Sacco
—
3
The Colonial Society of Massachusetts Amory L Loring Treasurer
—
4
Wayland Historical Society Inc

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.

—
5
Cuttyhunk Historical Society Inc
Arts & Culture
6
Fitchburg Historical Society

Museum and research library for history of fitchburg, massachusetts

—
7
Fitchburg Art Museum

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…

Arts & Culture
8
New England Museum of Telephony
—
9
The Compact of Cape Cod Conservation Trusts Inc

To encourage and assist in the acquisition, preservation and management of open space on cape cod

Environment
10
New England Museum Association

New england museum association's mission is to connect a community engaged in learning, collaboration, and action to cultivate a better museum world.

—
11
Penacookhistoricalsociety

Historical preservation for the town of Penacook and restoration of historical buildings

Arts & Culture
12
The Cambridge Historical Society

To foster and encourage the study of Cambridge history, and to provide educational resources and programs for the benefit of the community.

Arts & Culture
How this is measured
The grantee most central to the portfolio’s shape is Society for the Preservation of New Engl; 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.
04the grantee network

16 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. 16 of the 28 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.

0
Load-bearing (≥25% of a budget)
3
Early backer (in before they grew)
16/16
Grantees still filing
9/16
Grew since first funded

Where the money sits, by cause and then by grantee

University of California San Diego: $52,000 · OtherUniversity of California San DiegoVirginia Tech: $42,500 · OtherVirginia TechPurdue Foundation: $29,000 · OtherPurdue FoundationMaritime Museum of San Diego: $19,000 · OtherMaritime Museum of San DiegoTrustees of the Reservations: $18,000 · OtherTrustees of the ReservationsIndividual grant recipient: $14,500 · OtherIndividual grant recipientTHE NATURE CONSERVANCY: $12,000 · OtherTHE NATURE CONSERVANCYTRUSTEES OF PURDUE UNIVERSITY: $10,000 · Other+6 more: $22,000 · Other+6 moreCONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM: $84,500 · Arts & CultureCONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUMSOCIETY FOR THE PRESERVATION OF NEW ENGL: $39,000 · Arts & CultureSOCIETY FOR THE PRESERVATION OF NEW ENGLPEABODY ESSEX MUSEUM INC: $38,000 · Arts & CulturePEABODY ESSEX MUSEUM INCFOLK ARTS CENTER OF NEW ENGLAND INC: $18,000 · Arts & CultureFOLK ARTS CENTER OF NEW ENGLAND INCCOUNTRY DANCE AND SONG SOCIETY INC: $12,000 · Arts & CultureCOUNTRY DANCE AND SONG SOCIETY INCARCADIA PROJECT: $8,000 · Arts & Culture+3 more: $9,500 · Arts & CultureMassachusetts Institute of Technology: $38,000 · EducationFRIENDS OF THE GUEST HOUSE INC: $20,000 · HealthCONCORD LAND CONSERVATION TRUST: $4,000 · EnvironmentTHE ESCONDIDO CREEK CONSERVANCY: $1,000 · EnvironmentConcord Housing Foundation Inc: $2,000 · Housing & Shelter
Other$219,000Arts & Culture$209,000Education$38,000Health$20,000Environment$5,000Housing & Shelter$2,000

Each grantee by its size and the funder’s share of it; top left is load-bearing

25%50%75%100%$100k$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetCONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM: $84,500 over 6y, 0.8% of budgetSOCIETY FOR THE PRESERVATION OF NEW ENGL: $39,000 over 6y, 0.1% of budgetMassachusetts Institute of Technology: $38,000 over 5y, 0.0% of budgetPEABODY ESSEX MUSEUM INC: $38,000 over 6y, 0.0% of budgetFRIENDS OF THE GUEST HOUSE INC: $20,000 over 6y, 0.4% of budgetFOLK ARTS CENTER OF NEW ENGLAND INC: $18,000 over 6y, 1.2% of budgetTHE NATURE CONSERVANCY: $12,000 over 6y, 0.0% of budgetCOUNTRY DANCE AND SONG SOCIETY INC: $12,000 over 6y, 0.2% of budgetARCADIA PROJECT: $8,000 over 1y, 3.7% of budgetCAMBRIA LIBRARY ASSOCIATION: $5,000 over 5y, 0.1% of budgetFAIRBANKS MUSEUM & PLANETARIUM: $4,000 over 1y, 0.1% of budgetCONCORD LAND CONSERVATION TRUST: $4,000 over 1y, 0.4% of budgetREVERE AND SON HERITAGE TRUST CORPORATION: $3,000 over 1y, 0.4% of budgetFRIENDS OF THE NORTH BROOKFIELD TOWN HOUSE: $2,500 over 1y, 6.7% of budgetConcord Housing Foundation Inc: $2,000 over 1y, 0.7% of budgetTHE ESCONDIDO CREEK CONSERVANCY: $1,000 over 1y, 0.0% of budget
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 CONCORD ANTIQUARIAN SOCIETY D/B/A CONCORD MUSEUM ↗
  • Who funds SOCIETY FOR THE PRESERVATION OF NEW ENGL ↗
  • Who funds Massachusetts Institute of Technology ↗
  • Who funds PEABODY ESSEX MUSEUM INC ↗
  • 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 FAIRBANKS MUSEUM & PLANETARIUM ↗
  • Who funds CONCORD LAND CONSERVATION TRUST ↗
  • 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 ↗

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.

Vanguard Charitable E…The Bank of America C…Donor Advised Charita…Fidelity Investments …Amazonsmile Foundation
Vanguard Charitable Endowment ProgramPA7.9× affinity6 shared granteesties to 4 of 4Hover any node to trace its alignments.Compare side by side →

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

How this is measured
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. Overlap is association, not proof of shared intent.

How much its grantees rely on government

Each dot is one organization The Tiedemann Foundation funds: left to right is the share of its income from government, bottom to top the share from The Tiedemann Foundation. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 30%1%3%6%10%funder's share of their income ↑0%15%30%45%60%share of the org’s income from government →median 4%
  • 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
no gov moneyreceives it· size = income
3get no government money at all
6report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–60%
typical government reliance, FY20–25
How this is measured
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 a grant caused the public funding. Coverage is precision-first, a floor rather than 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 to 24 months.
05Through Plinth

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.

On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 28 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

How this is measured
Each figure carries one of six labels. Filed is what the funder reported on its return. Official is another government record about an organization, such as a federal award or a charity register, joined by name where no shared identifier exists. Resolved is an identity we worked out where the filing named a recipient without an EIN, kept only above a measured confidence threshold. Computed is arithmetic over those, like themes, portfolio clusters and co-funder strength. Context is a statistic about a place rather than about an organization, which is what the need overlay is: it describes the area a grantee’s address sits in, not where its work lands. Inferred is drawn by a model from text, like the partnerships read out of public news and organization websites. Each is labeled where it appears.

Generated from the IRS Form 990-PF e-file return for fiscal year 2025, released 2025. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Source object · view filing

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More from the funding graph

The unnamed billions
grants reported with no recipient in the public record
The regranting layer
51% of grant dollars land in the regranting layer
The DAF merry-go-round
$9.7B circulates between donor-advised funds
The endowment market
who holds foundation money, and what just moved
The camps
funders cluster by geography, not ideology
By state
where grant money is based, and what stays home