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Virginia · Private foundation

Proteus Foundation

Its FY2025 filing reports that it accepted unsolicited grant applications.

$520k
Granted FY2025(still arriving)
30
Grants FY2025
25
Organizations funded FY2024
20%
First-time grantees FY2024
Read the full brief
Median grant, FY2025
$5,000
Largest grant, FY2025
$100,000
Organizations funded a year
19 to 25
FY2020 to FY2024
States reached, FY2025
7
Total assets, FY2025
$8.6M
Applications
Takes unsolicited applications
Per its most recent filing; check its own site

How open it is to new grantees

In FY2024, 20% of the organizations Proteus Foundation funded were first-time grantees, receiving 13% of its grant dollars.

New vs renewed · share of each year

In FY2024, 87% of grant dollars renewed an existing relationship; $46k went to new ones.

50%100%’21’22’23’24
RenewedFirst-time

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

’21’22’23’24
EnvironmentHuman ServicesEducationInternationalCivil RightsAnimalsOther
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.
The numbers by year
Fiscal yearOrganizations fundedTo those organizationsFirst-time grantees
FY2025still arriving28$445k21%
FY202425$364k20%
FY202319$255k21%
FY202221$210k48%
FY202123$349k22%
FY202021$358kn/a
100% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2020 to 2025.

Philanthropy$718kScience & Tech$625kArts & Culture$411kEnvironment$296kEducation$226kFood & Nutrition$138kInternational$100kPublic Safety & Disaster$90kOther$0

Where its grants go

Grant dollars by states, across the years we hold.

Which US states its grants reach

MA
IN
PA
CA
CO
KY
WV
VA
NM
DC

Top grantees

Largest recipients by total granted, FY2020 to FY2025, and the share of each one’s budget the grants supplied at peak.

Show all 27 grantees

What it could do for these grantees

Plus 24 recipients with no EIN on record ($683k), not named here.

Where it is load-bearing

Each grantee by its size and the share of its budget Proteus Foundation supplied at peak.

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetCenter for Open Science Inc: $200,000 over 6y, 0.5% of budgetSanta Fe Institute: $200,000 over 6y, 0.4% of budgetGreen Forests Work Inc: $125,000 over 4y, 1.6% of budgetMediators Foundation Inc: $75,000 over 2y, 1.4% of budgetFriends of the Pittsburgh Urban Forest: $64,000 over 6y, 0.8% of budgetGrow Pittsburgh: $60,000 over 2y, 2.0% of budgetFoodshed Capital: $60,000 over 2y, 7.9% of budgetFern Hollow Nature Center Inc: $55,000 over 2y, 0.9% of budgetMIT Free Speech Alliance: $40,000 over 4y, 7.3% of budgetSquirrel Hill Urban Coalition: $40,000 over 2y, 17% of budgetHistoric Staunton Foundation Inc: $30,000 over 6y, 2.9% of budgetHighland Medical Center Inc: $30,000 over 6y, 0.1% of budgetHighland County Volunteer Rescue Squad Inc: $30,000 over 6y, 2.4% of budgetHighland County Humane Society Inc: $25,000 over 4y, 8.9% of budgetHighland Children's House: $25,000 over 5y, 1.8% of budgetSewickley Public Library: $20,000 over 4y, 0.3% of budgetAllegheny Land Trust: $20,000 over 4y, 0.1% of budgetProject Grows Inc: $17,500 over 2y, 3.2% of budgetFuture Generations University Corporation: $16,000 over 1y, 0.4% of budgetRenewing Homes of Greater Augusta Inc: $15,000 over 3y, 2.5% of budgetClean Air Task Force Inc: $15,000 over 1y, 0.1% of budgetAmerican National Red Cross & Its Constituent Chapters and Branches: $10,000 over 2y, 0.0% of budgetAmerican Shakespeare Center: $5,000 over 1y, 0.1% of budgetSewickley Academy: $5,000 over 1y, 0.0% of budget

Tap a dot to name the grantee.

How this is measured
Share of budget is the funder’s grant in a year over the grantee’s total revenue that year, at its highest across the years we hold; revenue is from all sources. Only grantees confirmed against their own filings, whose grants do not exceed their revenue, are plotted: the largest 24.

Nonprofits that may fit its grantmaking

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.

The Pittsburgh FoundationPA17.7× affinity7 shared granteesties to 10 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Pittsburgh Foundation · Community Foundation of the Central Blue Ridge · The Community Foundation of Harrisonburg & Rockingham County · Glen and Diane Meakem Foundation Inc · Richard King Mellon Foundation · The Heinz Endowments · The Kopf Family Foundation · The Grable Foundation · National Philanthropic Trust · American Endowment Foundation · Vanguard Charitable Endowment Program · Paypal Charitable Giving Fund

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.

Compare Proteus Foundation with peer funders

About Proteus Foundation

How much does Proteus Foundation give?
Proteus Foundation reported 30 grants totaling $520,000 in its FY2025 IRS filing. It funded between 19 and 25 organizations a year over FY2020 to FY2024.
What does Proteus Foundation fund?
By grant dollars over FY2020 to FY2025, its largest causes are Philanthropy (26%), Science & Tech (22%), Arts & Culture (15%).
Who are Proteus Foundation's largest grantees?
By total granted over FY2020 to FY2025: Center for Open Science Inc ($200k), Santa Fe Institute ($200k), Green Forests Work Inc ($125k).
Does Proteus Foundation fund new organizations?
In FY2024, 20% of the organizations it funded were first-time grantees.
Does Proteus Foundation accept unsolicited applications?
Its most recent filing reports that it accepts unsolicited grant applications.
Which funders back the same organizations as Proteus Foundation?
Its strongest co-funders, measured against what their size predicts, include The Pittsburgh Foundation, Community Foundation of the Central Blue Ridge, The Community Foundation of Harrisonburg & Rockingham County.
Where is Proteus Foundation based?
Proteus Foundation is based in VA.

On method. Every financial figure here is read from IRS e-file XML, the funder’s own 990/990-PF, and from the multi-year returns of the 54 grantees we resolved, each linked to its source. Grantee outcomes are each organization’s own program-service reporting (Form 990, Part III), read as association with funding, never as caused by it. Low-confidence name matches are suppressed rather than guessed. How we build these →

How this is measured
Each figure carries one of six labels. Filed is what the funder reported on its 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.

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

Source object · view filing

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