· Private foundation
Tonkinson 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 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 $10k38 grants · $75k
- $10k–50k6 grants · $125k
- $50k–250k3 grants · $225k
| Recipient | Amount |
|---|---|
| Friends of the Underline | $100,000 |
| Florida International University Fnd | $74,750 |
| Diabetes Research Foundation | $50,000 |
| University of Miami | $32,000 |
| Coral Gables Community Foundation | $28,500 |
| National Geographic Society | $20,000 |
| Zoo Miami Foundation | $15,800 |
| The Way Forward Foundation | $15,000 |
| Branches Inc | $13,500 |
| Deering Estate Foundation | $7,800 |
| Foundation for New Education Initia | $5,000 |
| Clearwater Free Clinic Inc | $5,000 |
| Egyptian Theater Park City | $5,000 |
| The Villagers | $5,000 |
| South Florida SPCA | $5,000 |
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, $366k) land where the poverty rate runs at 13%, against an area that typically sits at 9%. 85% 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.
69 repeat relationships — 38 still active in FY2025, 31 since wound down; 8 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; $26k 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
- UOUniversity of Miami9× · 2017–2025 · $243k · revenue +96%
- FOFRIENDS OF THE UNDERLINE INC6× · 2020–2025 · $203k · revenue +264%
- TWThe Woody Foundation Inc dba The Way Forward Foundation8× · 2017–2024 · $122k · revenue +10%
Funded once
- DFDRI Foundationone grant, 2018 · $36k
- AAADRIENNE ARSHT CENTER FOUNDATION INCgraduatedone grant, 2017 · $10k · revenue +54%
- MCMALTA CROSS FOUNDATION INTERNATIONAL INCone grant, 2022 · $9k
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 mission of florida grand opera is to enrich people's lives through an awareness and deeper appreciation of opera while supporting the operations of the greater miami opera and the opera guild, inc. by expanding its reach to diverse…
Marine research
In 2024, biscayne bay waterkeeper (d/b/a miami waterkeeper) built on our reputation by navigating challenges, seizing opportunities, and continuing our unwavering commitment to safeguarding our precious waterways and finding local…
The advancement of marine and environmental sciences through scientific research, education and public outreach, leading new discoveries, revitalization and sustainability of our oceans and greater public understanding of our marine…
To serve as a catalyst for the establishment of miami as the technology hub for the americas in order to propel innovation and investment in south florida and latin america.
The fiu research foundation provides means by which discoveries, inventions, processes, and work products of faculty, staff and students of the university may be patented, developed, applied and utilized in order that the results of such…
Offer cultural experience
For reference, the grantee most central to the portfolio’s shape is Voices for Children Foundation Inc and the most unlike its peers is Actors' Playhouse Productions Inc. 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 38 years old; the field is 11. You back the established end — and your money leans older still.
The field is 28% startups (under 5 years old) — 4% of your grantees by number, and just 0% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 17% 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.
51 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. 51 of the 100 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 University of Miami ↗
- Who funds FRIENDS OF THE UNDERLINE INC ↗
- Who funds The Woody Foundation Inc dba The Way Forward Foundation ↗
- Who funds SHELTERBOX USA INC ↗
- Who funds CORAL GABLES COMMUNITY FOUNDATION INC ↗
- Who funds ZOO MIAMI FOUNDATION INC ↗
- Who funds FOUNDATION FOR NEW EDUCATION INITIATIVES INC ↗
- Who funds ROTARY FOUNDATION OF CORAL GABLES INC ↗
- Who funds THE DEERING ESTATE FOUNDATION INC ↗
- Who funds NATIONAL GEOGRAPHIC SOCIETY ↗
- Who funds Clearwater Free Clinic Inc ↗
- Who funds CHAPMAN PARTNERSHIP INC ↗
- Who funds South Florida SPCA Inc ↗
- Who funds SOUTH FLORIDA PROGRESS FOUNDATION INC ↗
- Who funds ORCHESTRA MIAMI INC ↗
- Who funds Love Fund Inc ↗
- Who funds SPECIAL OLYMPICS FLORIDA Inc ↗
- Who funds THE MIAMI FOUNDATION INC ↗
- Who funds Miami Rescue Mission Inc ↗
- Who funds ACTORS' PLAYHOUSE PRODUCTIONS INC ↗
- Who funds FAIRCHILD TROPICAL BOTANIC GARDEN INC ↗
- Who funds SOUTH FLORIDA PBS INC ↗
- Who funds ADRIENNE ARSHT CENTER FOUNDATION INC ↗
- Who funds MIAMI LIGHTHOUSE FOR THE BLIND AND VISUALLY IMPAIRED INC ↗
- Who funds TROPICAL AUDUBON SOCIETY INC ↗
- Who funds MIAMI MUSIC PROJECT INC ↗
- Who funds GUITARS OVER GUNS ORGANIZATION INC ↗
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: The Miami Foundation Inc · Mightycause Charitable Foundation · The Batchelor Foundation Inc · The Kirk Foundation · Dunspaugh Dalton Foundation Inc · John S and James L Knight Foundation · Peacock Foundation Inc · Greater Miami Jewish Federation Inc · Key Biscayne Community Foundation Inc · Westminster Barrington Foundation · United Way Miami Inc · Goldsmith Family Foundation Inc
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 Tonkinson Foundation Inc 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.
- Friends of the Underline Inc — 66% of income from government
- Voices for Children Foundation Inc — 48% of income from government
- Als Therapy Development Foundation Inc — 8% of income from government
- University of Miami — 5% of income from government
- Fairchild Tropical Botanic Garden Inc — 4% of income from government
- Miami Music Project Inc — 2% of income from government
- Guitars Over Guns Organization Inc — 1% of income from government
- Jackson Health Foundation Inc — 1% of income from government
- Spca Inc — 0% of income from government
- Miami Lighthouse for the Blind and Visually Impaired Inc — 0% of income from government
- Chapman Partnership Inc — 0% of income from government
- Food for the Poor Inc — 0% of income from government
- Zoo Miami Foundation Inc — 0% of income from government
- South Florida Pbs 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 Tonkinson Foundation Inc?
Find your warmest path to Tonkinson 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.