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The Mill Spring Foundation 084206-000 at a glance

· Private foundation

The Mill Spring Foundation 084206-000

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.

$653k
Granted FY2025still arriving
22
Grants FY2025still arriving
2
States reached
$200k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0193% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2021 to 2025.

Education$923kInternational$725kScience & Tech$283kArts & Culture$241kHuman Services$155kYouth Development$119kEnvironment$100kPublic Benefit$90kOther$0
02FY2025 · 22 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • Under $10k8 grants · $43k
  • $10k–50k10 grants · $160k
  • $50k–250k4 grants · $450k
$10,000
Median grant
2
States reached
$2.3M
Total assets
Largest grants
RecipientAmount
THE WORLD AFFAIRS COUNCIL OF$200,000
SCIENCE HISTORY INSTITUTE$100,000
FRANKLIN INSTITUTE$100,000
WOODMERE ART MUSEUM$50,000
LEADERSHIP INSTITUTE$25,000
WHITEMARSH FOUNDATION$25,000
CONSUMER BANKRUPTCY ASSISTANCE$25,000
FACE TO FACE$20,000
WISSAHICKON VALLEY PUBLIC LIBRARY$15,000
Individual grant recipient$10,000
FOUNDATION FOR FREE ENTERPRISE$10,000
PHILADELPHIA ZOO$10,000
FAMILY PROMISE MONTCO PA$10,000
GIRL SCOUTS OF EASTERN PA$10,000
GEMMA SERVICES$7,500
02The need
03

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:

Its human-services grants (FY21–25, $208k) land where the poverty rate runs at 15%, against an area that typically sits at 8%. 58% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 8%CHRIST'S HOME: $15k → 6%CRADLE OF HOPE: $5k → 7%THE BABY BUREAU: $3k → 6%CRADLE OF HOPE: $5k → 7%KenCrest: $5k → 7%GEMMA SERVICES: $8k → 7%GEMMA SERVICES: $5k → 7%GEMMA SERVICES: $5k → 7%CRADLE OF HOPE: $5k → 7%INTERFAITH HOUSING ALLIANCE: $5k → 22%GEMMA SERVICES: $5k → 7%FAMILY PROMISE MONTCO PA: $10k → 7%FAMILY PROMISE MONTCO PA: $10k → 7%FACE TO FACE: $60k → 22%FAMILY PROMISE MONTCO PA: $8k → 7%FACE TO FACE: $25k → 22%FACE TO FACE: $20k → 22%FACE TO FACE: $10k → 22%0%20%40%50%more need →
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.
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.

72%of every dollar goes to organizations it has funded before.
$2.0M · 25 repeat orgs$792k to everyone else

Grantees it renews have grown median revenue +21% since the first grant, against +15% for those funded once.

25 repeat relationships: 18 still active in FY2025, 7 since wound down; 3 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

25
10

Total granted

$2.0M
$677k

Median revenue growth · since first grant

+21%
+15%

Still filing today

76%
90%

New vs renewed · share of each year

In FY2025, 82% of grant dollars renewed an existing relationship; $115k went to new ones.

50%100%’21’23’24’25
RenewedFirst-time

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

’21’23’24’25
Human ServicesArts & CultureEducationYouth DevelopmentEnvironmentHealthOther
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

  • TP
    THE PUBLIC SCHOOL OF GERMANTOWN
    3× · 2021–2024 · $350k · revenue +26%
  • TF
    THE FRANKLIN INSTITUTE
    4× · 2021–2025 · $183k · revenue +60%
  • FT
    FACE TO FACE INC
    4× · 2021–2025 · $115k · revenue +16%

Funded once

  • WP
    WILLIAM PENN CHARTER SCHOOL INC
    one grant, 2023 · $500k · revenue -24%
  • HH
    Highlands Historical Society
    one grant, 2024 · $100k · revenue -94%
  • WA
    WORLD AFFAIRS COUNCIL OF PHILADELPHIAgraduated
    one grant, 2021 · $25k · revenue +72%
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.

1
The Philadelphia School

The philadelphia school educates children for a future that is impossible to know but not impossible to shape. learn here. go anywhere.

—
2
Philadelphia Performing Arts a String Theory Charter School

Charter school providing students a content rich, adademically rigerous core knowledge education with a well-defined, sequential curriculum in a safe, orderly disiplined and caring environment.

Education
3
Mastery Charter High School

All students learn the academic and personal skills they need to be truly prepared for postsecondary success and able to pursue their dreams.

Education
4
The Grayson School

The grayson school provides gifted children a challenging, research-based education worthy of their intellect and their intrinsic desire to learn and think deeply. we serve as a valued resource for the gifted education community in…

Education
5
Trustees of the University of Pennsylvania

The trustees of the university of pennsylvania (the "university") sees itself as having a public service mission. in such regard, the university aims to provide a rich and diverse educational environment for its students; to pioneer…

Education
6
The Montessori School

The Montessori School educates children from 18 months-6th grade. Our program is rooted in the educational philosophy of Dr. Maria Montessori faithful to her method. In our caring environment, sustained by freedom peace, the school…

—
7
Historical Society of Pennsylvania

To inspire individuals and organizations to create a better future through historical understanding.

—
8
Valley Day School

Valley day school is a private, non-profit, state-funded, special education school licensed by the pennsylvania department of education for students who are experiencing learning and/or adjustment difficulties.

—
9
The Pennsylvania Horticultural Society

Founded in 1827, the pennsylvania horticultural society (phs) uses horticulture to advance the health and well-being of the greater philadelphia region. (continued in sch o)phs's work focuses on four impact priorities: creating healthy…

Environment
10
Episcopal Academy

Challenging and nurturing mind, body, and spirit, we inspire boys and girls to lead lives of purpose, faith, and integrity.

Education
11
Kennett Square Preschool Cooperative

Preschool education for 3, 4 and 5 year old children in the kennett square, pennsylvania area

Education
12
Philadelphia Chamber Music Society

To engage our community in a life more beautiful through the shared experience and transformative impact of chamber music, by arranging diverse and compelling programs by exceptional artists at affordable prices, and by presenting new…

Arts & Culture
How this is measured
The grantee most central to the portfolio’s shape is Christs Home; the most unlike its peers is Highlands Historical Society. 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

30 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. 30 of the 39 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.

0
Load-bearing (≥25% of a budget)
5
Early backer (in before they grew)
30/30
Grantees still filing
20/30
Grew since first funded

Where the money sits, by cause and then by grantee

WILLIAM PENN CHARTER SCHOOL INC: $500,000 · EducationWILLIAM PENN CHARTER SCHOOL INCTHE PUBLIC SCHOOL OF GERMANTOWN: $350,000 · EducationTHE PUBLIC SCHOOL OF GERMANTOWNWISSAHICKON VALLEY PUBLIC LIBRARY: $50,000 · EducationWISSAHICKON VALLEY PUBLIC LIBRARY+2 more: $20,000 · EducationTHE WORLD AFFAIRS COUNCIL OF: $700,000 · OtherTHE WORLD AFFAIRS COUNCIL OFCONSUMER BANKRUPTCY ASSISTANCE PROJECT: $55,000 · OtherCONSUMER BANKRUPTCY ASSISTANCE PROJECTZOOLOGICAL SOCIETY OF PHILADELPHIA: $50,000 · Other+15 more: $198,500 · Other+15 moreTHE FRANKLIN INSTITUTE: $183,000 · Arts & CultureTHE FRANKLIN INST…WOODMERE ART MUSEUM: $130,000 · Arts & CultureWOODMERE ART MUSE…Highlands Historical Society: $100,000 · Arts & CultureHighlands Histori…ROCK TO THE FUTURE INC: $20,000 · Arts & CultureMUSICWORKS: $17,500 · Arts & Culture+1 more: $6,000 · Arts & CultureFACE TO FACE INC: $115,000 · Human ServicesFAMILY PROMISE MONTCO PA: $32,500 · Human ServicesGemma Services: $22,500 · Human ServicesCHRISTS HOME: $15,000 · Human ServicesCradle of Hope Inc: $15,000 · Human Services+2 more: $7,500 · Human ServicesSCIENCE HISTORY INSTITUTE: $100,000 · Science & TechThe Whitemarsh Foundation: $100,000 · EnvironmentLeadership Institute: $90,000 · Public Benefit
Education$920,000Other$1,003,500Arts & Culture$456,500Human Services$207,500Science & Tech$100,000Environment$100,000Public Benefit$90,000

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

25%50%75%100%$1.0M$10M$100Mgrantee revenue →↑ funder's share of their budgetWILLIAM PENN CHARTER SCHOOL INC: $500,000 over 1y, 0.6% of budgetTHE PUBLIC SCHOOL OF GERMANTOWN: $350,000 over 3y, 0.5% of budgetTHE FRANKLIN INSTITUTE: $183,000 over 4y, 0.1% of budgetWOODMERE ART MUSEUM: $130,000 over 4y, 0.7% of budgetFACE TO FACE INC: $115,000 over 4y, 2.0% of budgetSCIENCE HISTORY INSTITUTE: $100,000 over 1y, 1.1% of budgetHighlands Historical Society: $100,000 over 1y, 1.1% of budgetThe Whitemarsh Foundation: $100,000 over 3y, 5.8% of budgetLeadership Institute: $90,000 over 3y, 0.1% of budgetCONSUMER BANKRUPTCY ASSISTANCE PROJECT: $55,000 over 4y, 4.5% of budgetWISSAHICKON VALLEY PUBLIC LIBRARY: $50,000 over 3y, 1.3% of budgetZOOLOGICAL SOCIETY OF PHILADELPHIA: $50,000 over 4y, 0.1% of budgetFAMILY PROMISE MONTCO PA: $32,500 over 4y, 0.7% of budgetFOUNDATION FOR FREE ENTERPRISE EDUCATION: $27,000 over 4y, 0.4% of budgetWORLD AFFAIRS COUNCIL OF PHILADELPHIA: $25,000 over 1y, 1.5% of budgetGemma Services: $22,500 over 4y, 0.0% of budgetROCK TO THE FUTURE INC: $20,000 over 4y, 1.1% of budgetMUSICWORKS: $17,500 over 3y, 0.6% of budgetCHRISTS HOME: $15,000 over 1y, 0.1% of budgetHOPE SPRINGS EQUESTRIAN THERAPY INC: $15,000 over 3y, 2.9% of budgetCHILDREN'S SCHOLARSHIP FUND PHILADELPHIA: $15,000 over 3y, 0.0% of budgetCradle of Hope Inc: $15,000 over 3y, 1.6% of budgetGIRLS ROCK PHILLY: $10,000 over 2y, 3.6% of budgetGIRL SCOUTS OF EASTERN PENNSYLVANIA INC: $10,000 over 1y, 0.1% of budgetBETHESDA PROJECT: $7,500 over 1y, 0.1% of budgetENCHANTMENT THEATRE COMPANY: $6,000 over 2y, 2.0% of budgetSpecial Equestrians Inc: $6,000 over 2y, 0.6% of budgetKENCREST SERVICES: $5,000 over 1y, 0.0% of budgetCCSA FOUNDATION: $5,000 over 1y, 0.1% of budgetBABY BUREAU: $2,500 over 1y, 2.0% of budget
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.

The Philadelphia Foun…Henry Dolfinger 2 Tru…Connelly FoundationLindback Cr & Mf Foun…Wsfs Cares FoundationUnited Way of Greater…The William Penn Foun…The Cedarcrest Charit…The Gordon Charter Fo…Independence Foundati…W W Smith Charitable …Chubb Charitable Foun…
The Philadelphia FoundationPA34.1× affinity15 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: The Philadelphia Foundation · Henry Dolfinger 2 Trust Uw · Connelly Foundation · Lindback Cr & Mf Foundation Tw Main · Wsfs Cares Foundation · United Way of Greater Philadelphia and Southern New Jersey · The William Penn Foundation · The Cedarcrest Charitable Foundation Aka Blbb Charitable · The Gordon Charter Foundation · Independence Foundation · W W Smith Charitable Trust · Chubb Charitable 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 The Mill Spring Foundation 084206-000 funds: left to right is the share of its income from government, bottom to top the share from The Mill Spring Foundation 084206-000. Bigger dots raise more.

2024
’20’21’22’23’24’25
no gov · 00%1%3%6%10%funder's share of their income ↑0%4%8%11%15%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get 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 · 0–15%
    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 The Mill Spring Foundation 084206-000?

    Find your warmest path to The Mill Spring Foundation 084206-000 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.

    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 39 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

    Play a game based on Mill Spring Foundation 084206-000’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