· Private foundation
Tidemark 10 Foundation
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.
Read this first · the figures below need context
95% of Tidemark 10 Foundation’s FY2025 grant dollars went to The Board Of Trustees Of The Leland Stanford Junior University, not to grantees.
Its money now reaches organizations through that sponsor, which does not report who recommended each grant. FY2025 names 11 organizations directly, so a portfolio cannot be read from it.
Organizations named directly on the return
Amber years are those where most dollars went to a sponsor.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2022–2025.
Where the money goes
Your grants by size, and where they go.
By grant size · FY2025
- Under $10k8 grants · $27k
- $10k–50k6 grants · $70k
- $250k+2 grants · $1.3M
| Recipient | Amount |
|---|---|
| STANFORD UNIVERSITY | $1,000,000 |
| FIDELITY INVESTMENTS CHARITABLE GIFT FUND | $300,000 |
| NATURE CONSERVANCY | $20,000 |
| PBS FOUNDATION | $10,000 |
| CARNEGIE ENDOWMENT FOR INTERNATIONAL PEACE | $10,000 |
| NATURAL RESOURCES DEFENSE COUNCIL INC | $10,000 |
| KQED INC | $10,000 |
| REFED INC | $10,000 |
| SUSTAINABLE SURF | $5,720 |
| LOS ANGELES FIRE DEPARTMENT FOUNDATION | $5,000 |
| WORLD CENTRAL KITCHEN INCORPORATED | $5,000 |
| AMERICAN NATIONAL RED CROSS | $4,500 |
| LIFEMOVES | $2,500 |
| LA COCINA INC | $2,250 |
| TRUSTEES OF PRINCETON UNIVERSITY | $1,000 |
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 (FY22–25) land where the poverty rate runs at 7%, against an area that typically sits at 11%. 27% of your dollars go to grantees based in above-average-need neighborhoods. Your grants skew toward lower-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.
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.
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For reference, the grantee most central to the portfolio’s shape is Refed Inc and the most unlike its peers is Natural Resources Defense Council Inc. 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 18 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 BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY ↗
- Who funds DONOR ADVISED CHARITABLE GIVING INC ↗
- Who funds FIDELITY INVESTMENTS CHARITABLE GIFT FUND ↗
- Who funds WORLD CENTRAL KITCHEN INC ↗
- Who funds SUSTAINABLE SURF ↗
- Who funds THE NATURE CONSERVANCY ↗
- Who funds NATURAL RESOURCES DEFENSE COUNCIL INC ↗
- Who funds PBS FOUNDATION ↗
- Who funds KQED INC ↗
- Who funds REFED INC ↗
- Who funds CARNEGIE ENDOWMENT FOR INTERNATIONAL PEACE ↗
- Who funds LOS ANGELES FIRE DEPARTMENT FOUNDATION ↗
- Who funds Nora's Gift Foundation Inc ↗
- Who funds American National Red Cross & Its Constituent Chapters and Branches ↗
- Who funds LIFEMOVES ↗
- Who funds LA COCINA ↗
- Who funds President and Fellows of Harvard College ↗
Government reliance of your grantees
Every dot is one organization Tidemark 10 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 or a single department — and drag the year to watch it move.
- President and Fellows of Harvard College — 7% 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 Tidemark 10 Foundation?
Find your warmest path to Tidemark 10 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.