· Private foundation
Denise & Michael Riebe 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
By grantee IRS cause code (NTEE).
A cause breakdown isn’t shown here: 51% of DENISE & MICHAEL RIEBE FOUNDATION INC’s grantee dollars fall outside its nine largest cause areas, whether because the recipient carries no IRS cause code or because its cause sits in the long tail. A chart would be mostly one residual band and misrepresent the portfolio.
Where the money goes
Your grants by size, and where they go.
| Recipient | Amount |
|---|---|
| Individual grant recipient | $4,000 |
| Rails to Trails | $4,000 |
| Civil Air Patrol | $4,000 |
| World Central Kitchen | $4,000 |
| Centre for Women | $4,000 |
| Vanderbilt Health | $2,250 |
| Cheekwood Society | $1,500 |
| Friends of Warner Park | $525 |
| Friends of Radnor Lake | $500 |
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 (FY20–25, $23k) land where the poverty rate runs at 13%, against an area that typically sits at 11%. 100% 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.
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.
22 repeat relationships — 8 still active in FY2025, 14 since wound down; 1 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, 84% of grant dollars renewed an existing relationship; $4k 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
- TCTHE CENTRE FOR WOMEN INC6× · 2020–2025 · $23k · revenue +12%
University of South Florida Foundation Inc3× · 2020–2022 · $17k · revenue +58%- BWBig Waters Land Trust Inc4× · 2020–2024 · $12k · revenue +16%
Funded once
- CFConservation Fndtn of Gulf Coastone grant, 2021 · $5k
- IHIVY HOUSE INCone grant, 2024 · $4k
- TBTampa Bay Reforestation and Environone grant, 2022 · $3k
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 tampa bay partnership is a privately funded, ceo-driven regional advocacy organization, committed to creating a unified, competitive and prosperous tampa bay.
We harness the power of plants for humankind and share the joy and beauty of tropical gardening with everyone. fairchild tropical botanic garden is a museum of tropical plants within a world famous, 83-acre designed landscape. it was…
To promote visitation to florida by strengthening florida's share of the global travel market with the goal of maximizing the economic impact of travel and tourism to florida.
The ringling is a place of art, architecture, and circus in an environment that inspires, educates, entertains, and honors the legacy of john & mable ringling.
The Florida Aquarium's mission focuses on our Shared Purpose of a commitment to save marine wildlife, with a Vision to be Florida's leading conservation-based Aquarium. It accomplishes this mission through hosting over 1 million visitors…
To promote a culture of environmental stewardship through volunteer and educational opportunities.
The florida state university foundation enhances the academic mission and vision of florida state university through its organized fundraising activities and funds management. the fsu foundation accomplishes its mission by fostering…
To promote, encourage and enhance research activities at the university of south florida.
As an arts leader in florida, the ashley gibson barnett museum of art at florida southern college inc (the agb) educates and inspires the community through creative and diverse exhibitions and the acquisition and care of a permanent…
The american federation of arts initiates and organizes a national and international program of art exhibitions, publications, and educational activities to benefit the museum community and enrich the public's experience and understanding…
To enrich life by perpetuating tropical plants, ecosystems and cultural heritage through discovery, scientific research, conservation, and education.
The conservancy is a land conservation trust organized to help the community and landowners in the tampa bay region preserve natural and agricultural lands as well as the area's scenic heritage.
For reference, the grantee most central to the portfolio’s shape is Museum of Fine Arts of St Petersburg Florida Inc and the most unlike its peers is Rails to Trails Conservancy. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
17 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. 17 of the 35 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 THE CENTRE FOR WOMEN INC ↗
- Who funds University of South Florida Foundation Inc ↗
- Who funds Big Waters Land Trust Inc ↗
- Who funds TAMPA MUSEUM OF ART INC ↗
- Who funds FEEDING AMERICA TAMPA BAY INC ↗
- Who funds RAILS TO TRAILS CONSERVANCY ↗
- Who funds KALAMAZOO COLLEGE ↗
- Who funds ACTION ON SMOKING AND HEALTH ↗
- Who funds MUSEUM OF FINE ARTS OF ST PETERSBURG FLORIDA INC ↗
- Who funds FRIENDS OF TAMPA RECREATION INC ↗
- Who funds ALL FAITHS FOOD BANK INC ↗
- Who funds FRIST ART MUSEUM ↗
- Who funds SALVADOR DALI MUSEUM INC ↗
- Who funds TEAM RUBICON INC ↗
- Who funds FRIENDS OF RADNOR LAKE ↗
- Who funds NATIONAL ARBOR DAY FOUNDATION ↗
- Who funds GREENWAYS FOR NASHVILLE 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: Jpmorgan Chase Foundation · Frank E Duckwall Foundation · Debartolo Family Foundation Inc · Publix Super Markets Charities Inc · Raymond James Charitable Endowment Fund · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Charities Aid Foundation America · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc · National Philanthropic Trust · The Bank of America Charitable Foundation Inc · American Online Giving 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 Denise & Michael Riebe 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.
- The Centre for Women Inc — 6% of income from government
- Feeding America Tampa Bay Inc — 2% of income from government
- All Faiths Food Bank Inc — 1% of income from government
- Tampa Museum of Art 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 Denise & Michael Riebe Foundation Inc?
Find your warmest path to Denise & Michael Riebe 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.