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Plinth

· Private foundation

Elizabeth T Heim & Margaret L Rigby

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.

$229k
Granted FY2025still arriving
11
Grants FY2025still arriving
7
States reached
$57k
Largest
01What you fund
01100% classified

What you funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year — across FY20182025.

Health$1.3MEducation$749k
02FY2025 · 11 grants

Where the money goes

Your grants by size, and where they go.

By grant size · FY2025

  • $10k–50k10 grants · $172k
  • $50k–250k1 grant · $57k
$11,459
Median grant
7
States reached
$4.4M
Total assets
Largest grants
RecipientAmount
MAYO FOUNDATION$57,293
MENTAL HEALTH AMERICA INC$34,376
JOHNS HOPKINS HOSPITAL THE$22,917
AMERICAN HEART ASSOCIATION INC$22,917
MEMORIAL SLOAN-KETTERING CANCER$22,917
GLAUCOMA RESEARCH FOUNDATION$11,459
NATIONAL OSTEOPOROSIS FOUNDATION$11,459
THE ARTHRITIS RESEARCH INSTITUTE$11,459
NATIONAL FOUNDATION FOR CANCER RESEARCH$11,459
UNIVERSITY OF MIAMI-OPHTHALMOLOGY$11,459
MASONIC MEDICAL RESEARCH LAB$11,459
02The need
03

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.

show:

Dollar for dollar, your grants (FY18–25) land where the poverty rate runs at 12%, against an area that typically sits at 13%. 39% of your dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-need ZIPs.

area typical 13%MAYO FOUNDATION: $85k → 9%GLAUCOMA RESEARCH FOUNDATION: $17k → 10%MASONIC MEDICAL RESEARCH LAB: $17k → 16%MEMORIAL SLOAN-KETTERING CANCER: $34k → 17%NATIONAL OSTEOPOROSIS FOUNDATION: $17k → 14%THE ARTHRITIS RESEARCH INSTITUTE: $17k → 12%UNIVERSITY OF MIAMI-OPHTHALMOLOGY: $17k → 15%MENTAL HEALTH AMERICA INC: $51k → 9%NATIONAL FOUNDATION FOR CANCER RESEARCH: $17k → 8%JOHNS HOPKINS UNIVERSITY: $34k → 19%MAYO FOUNDATION: $77k → 9%GLAUCOMA RESEARCH FDN: $15k → 10%MASONIC MEDICAL RESEARCH LABORAT: $15k → 16%MEMORIAL SLOAN-KETTERING CANCER: $31k → 17%NATIONAL OSTEOPOROSIS FOUNDATION: $15k → 14%THE ARTHRITIS RESEARCH INSTITUTE: $15k → 12%UNIVERSITY OF MIAMI: $15k → 15%MENTAL HEALTH AMERICA INC: $46k → 9%NATIONAL FDN FOR CANCER RESEARCH: $15k → 8%JOHNS HOPKINS UNIVERSITY: $31k → 19%MAYO FOUNDATION: $65k → 9%GLAUCOMA RESEARCH FOUNDATION: $13k → 10%MASONIC MEDICAL RESEARCH LAB: $13k → 16%MEMORIAL SLOAN-KETTERING CANCER: $26k → 17%NATIONAL OSTEOPOROSIS FOUNDATION: $13k → 14%THE ARTHRITIS RESEARCH INSTITUTE: $13k → 12%MENTAL HEALTH AMERICA INC: $39k → 9%JOHNS HOPKINS UNIVERSITY: $26k → 19%MAYO FOUNDATION: $65k → 9%MEMORIAL SLOAN-KETTERING CANCER: $26k → 17%MENTAL HEALTH AMERICA INC: $39k → 9%JOHNS HOPKINS UNIVERSITY: $26k → 19%MAYO FOUNDATION: $63k → 9%MEMORIAL SLOAN-KETTERING CANCER: $25k → 17%MENTAL HEALTH AMERICA INC: $38k → 9%JOHNS HOPKINS UNIVERSITY: $25k → 19%MAYO FOUNDATION: $58k → 9%MEMORIAL SLOAN-KETTERING CANCER: $23k → 17%MENTAL HEALTH AMERICA INC: $35k → 9%JOHNS HOPKINS UNIVERSITY: $23k → 19%MAYO FOUNDATION: $57k → 9%MEMORIAL SLOAN-KETTERING CANCER: $23k → 17%MENTAL HEALTH AMERICA INC: $34k → 9%JOHNS HOPKINS HOSPITAL THE: $23k → 19%MAYO FOUNDATION: $54k → 9%MEMORIAL SLOAN-KETTERING CANCER: $22k → 17%MENTAL HEALTH AMERICA INC: $32k → 9%JOHNS HOPKINS UNIVERSITY: $22k → 19%0%20%40%50%more need →
grant to an above-average-need area below average· circle size = grant amount

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.

03Your edge
repeat funding

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.

99%of every dollar goes to organizations you’ve funded before.
$2.1M · 13 repeat orgs$23k to everyone else

And the relationships you keep tend to grow: grantees you re-up on have seen median revenue of +87% since the first grant, against 0% for the ones you funded once.

13 repeat relationships — 10 still active in FY2025, 3 since wound down; 1 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

13
1

Total granted

$2.1M
$23k

Median revenue growth · since first grant

+87%
0%

Still filing today

46%
100%

New vs renewed · share of each year

In FY2025, 90% of grant dollars renewed an existing relationship; $23k went to new ones.

50%100%’18’19’20’21’22’23’24’25
RenewedFirst-time

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

’18’19’20’21’22’23’24’25
HealthEducationOther

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

  • MH
    MENTAL HEALTH AMERICA INC
    8× · 2018–2025 · $314k · revenue +168%
  • AH
    American Heart Association Inc
    8× · 2018–2025 · $209k · revenue +26%
  • JOHNS HOPKINS UNIVERSITY
    7× · 2018–2024 · $186k · revenue +51%

Funded once

  • TJ
    THE JOHNS HOPKINS HOSPITAL
    one grant, 2025 · $23k · revenue 0%

Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.

04Your field
04the grantee network

7 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 20172025, not grant rows in a single year — so this will not match the grant count on the cover. 7 of the 14 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.

0
Load-bearing (≥25% of a budget)
1
Early backer (in before they grew)
7/7
Grantees still filing
6/7
Grew since you first funded

Where your money sits — by cause, then by grantee

MAYO FOUNDATION — $523,372 · OtherMAYO FOUNDATIONMENTAL HEALTH AMERICA INC — $314,023 · OtherMENTAL HEALTH AMERICA INCMEMORIAL SLOAN-KETTERING CANCER — $209,349 · OtherMEMORIAL SLOAN-KETTERING CANCERTHE ARTHRITIS RESEARCH INSTITUTE — $104,674 · OtherTHE ARTHRITIS RESEARCH INSTITUTENATIONAL OSTEOPOROSIS FOUNDATION — $104,674 · OtherNATIONAL OSTEOPOROSIS FOUNDATIONNATIONAL FOUNDATION FOR CANCER RESEARCH — $104,674 · OtherNATIONAL FOUNDATION FOR CANCER RESEARCHMASONIC MEDICAL RESEARCH LAB — $65,854 · OtherUNIVERSITY OF MIAMI-OPHTHALMOLOGY — $65,854 · OtherAmerican Heart Association Inc — $209,349 · HealthAmerican Heart Assoc…GLAUCOMA RESEARCH FOUNDATION — $104,674 · HealthGLAUCOMA RESEARCH FO…MASONIC MEDICAL RESEARCH LABORATORY — $38,820 · HealthMASONIC MEDICAL RESE…THE JOHNS HOPKINS HOSPITAL — $22,917 · HealthTHE JOHNS HOPKINS HO…JOHNS HOPKINS UNIVERSITY — $186,432 · EducationJOHNS HOPKIN…University of Miami — $38,820 · EducationUniversity o…
Other$1,492,474Health$375,760Education$225,252

Each org by its size and your share of it — top-left is where you’re load-bearing

25%50%75%100%$100Mgrantee revenue →↑ your share of their budgetMENTAL HEALTH AMERICA INC — $314,023 over 8y, 0.8% of budgetAmerican Heart Association Inc — $209,349 over 8y, 0.0% of budgetJOHNS HOPKINS UNIVERSITY — $186,432 over 7y, 0.0% of budgetGLAUCOMA RESEARCH FOUNDATION — $104,674 over 8y, 0.3% of budgetMASONIC MEDICAL RESEARCH LABORATORY — $38,820 over 3y, 0.2% of budgetUniversity of Miami — $38,820 over 3y, 0.0% of budgetTHE JOHNS HOPKINS HOSPITAL — $22,917 over 1y, 0.0% of budget
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 MENTAL HEALTH AMERICA INC
  • Who funds American Heart Association Inc
  • Who funds JOHNS HOPKINS UNIVERSITY
  • Who funds GLAUCOMA RESEARCH FOUNDATION
  • Who funds MASONIC MEDICAL RESEARCH LABORATORY
  • Who funds University of Miami
  • Who funds THE JOHNS HOPKINS HOSPITAL

Government reliance of your grantees

Every dot is one organization Elizabeth T Heim & Margaret L Rigby 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.

2024
202122232425
no gov · 00%0%1%3%5%your share of their income ↑0%5%10%15%20%share of the org’s income from governmentmedian 5%
  • Johns Hopkins University12% of income from government
  • University of Miami5% of income from government
  • The Johns Hopkins Hospital0% of income from government
no gov moneyreceives it· size = income
0get no government money at all
1report government grants on their 990 we could not trace to a source (not plotted)
0rely on government for over half their income
⤢ axis zoomed · 0–20%
typical government reliance, FY2025

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.

On method. Every financial figure here is read directly from IRS e-file XML — your own 990/990-PF and the multi-year returns of the 14 grantees we resolved across every year we hold, several hundred filings in all (a different count from the grant rows on the cover, which are one fiscal year)— each linked to its source. Grantee achievements and outcomes are each organization’s own program-service reporting (Form 990, Part III); we read these as association with sustained funding — the foundation is one of several forces — suppress low-confidence name matches rather than guess, and say so where a figure rests on a single grant or filing. Not everything on this page is a filed figure, and the difference matters. Filed is what you reported on your 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. How we build these →

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

Source object · view filing

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