How much does Si Robin Foundation give?

Si Robin Foundation reported 28 grants totaling $2,494,222 in its FY2025 IRS filing. It funded between 4 and 25 organizations a year over FY2018 to FY2024.

What does Si Robin Foundation fund?

By grant dollars over FY2017 to FY2025, its largest causes are Arts & Culture (65%), Health (15%), Science & Tech (12%).

Who are Si Robin Foundation's largest grantees?

By total granted over FY2017 to FY2025: Pearl Harbor Aviation Museum ($4.0M), UND Aerospace Foundation ($1.7M), San Diego Air & Space Museum Inc ($790k).

Does Si Robin Foundation fund new organizations?

In FY2024, 20% of the organizations it funded were first-time grantees.

Does Si Robin Foundation accept unsolicited applications?

Its most recent filing reports that it funds preselected organizations and does not take unsolicited requests. Check the foundation's own site before ruling it out.

Which funders back the same organizations as Si Robin Foundation?

Its strongest co-funders, measured against what their size predicts, include Clay Lacy Foundation, Ray Foundation Inc, Apex Foundation.

Where is Si Robin Foundation based?

Si Robin Foundation is based in CA.

Si Robin Foundation

Si Robin Foundation at a glance

· Private foundation

Si Robin 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.

$2.5M

Granted FY2025still arriving

Grants FY2025still arriving

States reached

$688k

Largest

01What it funds

0199% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2017 to 2025.

Arts & Culture$8.9MHealth$2.1MScience & Tech$1.7MEducation$440kRecreation & Sports$349kYouth Development$80kCommunity Improvement$46kPublic Safety & Disaster$20kOther$0

02FY2025 · 28 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

$10k–50k13 grants · $334k
$50k–250k13 grants · $1.2M
$250k+2 grants · $944k

$53,390

Median grant

States reached

$1.8M

Total assets

Largest grants
Recipient	Amount
PEARL HARBOR AVIATION MUSEUM	$688,488
PALM SPRINGS AIR MUSEUM INC	$255,600
PEARL HARBOR AVIATION MUSEUM	$164,240
San Diego Air and Space Museum	$150,000
UND AEROSPACE FOUNDATION	$142,000
PEARL HARBOR AVIATION MUSEUM	$117,382
BOB HOOVER ACADEMY	$100,000
ST JUDE CHILDREN'S RESEARCH HOSPITA	$92,591
ANGEL FLIGHT WEST	$85,835
Museum of Flight Foundation	$74,010
AERO CLUB OF SOUTHERN CA	$73,500
RENO AIR RACING ASSOCIATION INC	$60,000
PEARL HARBOR AVIATION MUSEUM	$53,436
CONDOR SQUADRON OFFICERS AIRMENS	$53,390
WINGS OVER THE ROCKIES	$50,000

02The need

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 (FY17–25) land where the poverty rate runs at 11%, against an area that typically sits at 10%. 54% of its dollars go to grantees based in above-average-need neighborhoods. Its grants spread fairly evenly across need levels.

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.

Which US states its grants reach

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.

98%of every dollar goes to organizations it has funded before.

$13M · 27 repeat orgs$324k to everyone else

27 repeat relationships: 19 still active in FY2025, 8 since wound down; 4 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

Total granted

$13M

$180k

Median revenue growth · since first grant

+21%

+43%

Still filing today

81%

25%

New vs renewed · share of each year

In FY2025, 94% of grant dollars renewed an existing relationship; $144k went to new ones.

RenewedFirst-time

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

Arts & CultureEducationHealthPhilanthropyRecreation & SportsPublic Safety & DisasterOther

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

PH
PEARL HARBOR AVIATION MUSEUM
9× · 2017–2025 · $4.0M · revenue +21%
UA
UND Aerospace Foundation
8× · 2017–2025 · $1.7M · revenue +18%
SD
SAN DIEGO AIR & SPACE MUSEUM INC
9× · 2017–2025 · $790k · revenue +26%

Funded once

CS
COLORADO SKIES ACADEMYgraduated
one grant, 2024 · $100k · revenue +43%
NV
NORTH VALLEY OCCUPATIONAL CENTER
one grant, 2023 · $40k
IG
Individual grant recipient
one grant, 2024 · $20k

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.

American Airpower Museum Co Cockpit Cpt Usa Llc

—

The Yanks Air Museum

Arts & Culture

North Cascades Vintage Aircraft Museum

—

Flying Leatherneck Aviation Museum

—

Eagles Mere Air Museum Foundation

Arts & Culture

Strategic Air Command & Aerospace Museum

The mission of the sac museum is to celebrate our heritage, preserve our artifacts, and inspire learning.

Arts & Culture

Chico Air Museum

The Chico Air Museum was founded to collect, preserve, document and display artifacts significant to the rich aviation and aerospace history of the Chico Army Air Field and the North Valley.

Arts & Culture

Connecticut Aeronautical Historical Association Inc

The new england air museum's mission is to preserve and present the story of aviation and aerospace, with an emphasis on new england's role, and the genius and inspiration that made it possible. the museum also seeks to inspire young…

Arts & Culture

Texas Flying Legends Museum

—

American Fighter Aces Association

Collect and preserve historical data, artifacts, and scientific objects with regard to the country's fighter aces, its military aviation and aviators' history. educate the public about the experience in military combat and offer…

—

Lone Star Flight Museum

Lone Star Flight Museum (LSFM) celebrates flight and achievements in Texas aviation, engages youth through STEM (science, technology, engineering, and math), and believes aviation inspires achievement and endless possibilities.

Arts & Culture

Santa Maria Museum of Flight Inc

To serve as preservationist of past, present, and future aerospace and aeronautical artifacts, historical documents, and memorabilia of the santa maria valley and this nation.

Arts & Culture

How this is measured

The grantee most central to the portfolio’s shape is Museum of Flight Foundation; the most unlike its peers is Condor Squadron Officers & Airmens. 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

27 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. 27 of the 35 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.

Load-bearing (≥25% of a budget)

Early backer (in before they grew)

27/27

Grantees still filing

19/27

Grew since first funded

Where the money sits, by cause and then by grantee

Arts & Culture$7,299,072Other$2,441,712Education$2,003,348Health$1,736,654Recreation & Sports$180,000Philanthropy$24,000Public Safety & Disaster$20,000

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

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.

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.

Clay Lacy FoundationCA24.2× affinity9 shared granteesties to 10 of 10Hover any node to trace its alignments.Compare side by side →

Open a dossier: Clay Lacy Foundation · Ray Foundation Inc · Apex Foundation · Enterprise Holdings Foundation · Vanguard Charitable Endowment Program · American Endowment Foundation · National Philanthropic Trust · Donor Advised Charitable Giving Inc · American Online Giving Foundation 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 Si Robin Foundation funds: left to right is the share of its income from government, bottom to top the share from Si Robin Foundation. Bigger dots raise more.

2024

’20’21’22’23’24’25

no gov moneyreceives it· size = income

1get no government money at all

7report government grants on their 990 we could not trace to a source (not plotted)

0rely on government for over half their income

⤢ axis zoomed · 0–10%

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 Si Robin Foundation?

Find your warmest path to Si Robin 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.

Play a game based on Si Robin’s filings →

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