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The Michael and Paula Rantz Foundation at a glance

· Private foundation

The Michael and Paula Rantz 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.

$1.1M
Granted FY2024still arriving
44
Grants FY2024still arriving
9
States reached
$150k
Largest
01What it fundsRead
02Its granteesRead
03Its fieldRead
01What it funds
0189% classified

What it funded, over time

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

Education$2.0MHuman Services$263kArts & Culture$256kEnvironment$242kHealth$215kPublic Benefit$75kReligion$70kPhilanthropy$38kOther$0
02FY2024 · 44 grants

Where the money goes

Grants by size, and the largest recipients.

How this is measured
The 44 grants below total $913,300, the rows itemized in this filing. The $1,113,300 headline is the total grant expense on the return; the other $200,000 is giving the schedule does not break out (grants under the $5,000 itemization floor, grants to individuals, grants on other schedules). Every figure below describes the itemized rows only.

By grant size · FY2024

  • Under $10k15 grants · $59k
  • $10k–50k25 grants · $454k
  • $50k–250k4 grants · $400k
$10,000
Median grant
9
States reached
$6.9M
Total assets
Largest grants
RecipientAmount
Cornell University$150,000
College Track$100,000
Castilleja School Foundation$100,000
PBS Foundation$50,000
FAME$36,000
Volcan Mountain Foundation$25,000
Foundation For College Education$25,000
University of Chicago$25,000
San Francisco Museum Of Modern Art$25,000
Verified Voting Foundation$25,000
Menlo School$25,000
San Francisco Museum Of Modern Art$25,000
Embarcadero Media Foundation$25,000
College Track$25,000
Avenidas$25,000
02Its grantees
repeat funding

Who it funds again

Organizations funded in more than one year, against those funded once.

80%of every dollar goes to organizations it has funded before.
$2.9M · 25 repeat orgs$703k to everyone else

Grantees it renews have grown median revenue +52% since the first grant, against +23% for those funded once.

25 repeat relationships: 18 still active in FY2024, 7 since wound down; 14 grantees were first funded in FY2024 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

25
24

Total granted

$2.9M
$400k

Median revenue growth · since first grant

+52%
+23%

Still filing today

72%
50%

New vs renewed · share of each year

In FY2024, 67% of grant dollars renewed an existing relationship; $303k went to new ones.

50%100%’20’21’22’23’24
RenewedFirst-time

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

’20’21’22’23’24
EducationHealthArts & CultureEnvironmentHuman ServicesPhilanthropyOther
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

  • MS
    MENLO SCHOOL
    5× · 2020–2024 · $330k · revenue +55%
  • Cornell University
    2× · 2020–2024 · $310k · revenue +46%
  • CS
    CASTILLEJA SCHOOL FOUNDATION
    4× · 2020–2024 · $241k · revenue +90%

Funded once

  • FU
    Fordham Universitygraduated
    one grant, 2020 · $50k · revenue +31%
  • UF
    UCFS FOUNDATION
    one grant, 2021 · $50k
  • UO
    U.S. OLYMPICS + PARALYMPICS
    one grant, 2020 · $25k
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.

03Its 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 Trustees of Princeton University

Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…

Education
2
Massachusetts Institute of Technology

The mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.

Education
3
Stony Brook Internists University Faculty Practice Corporation

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
4
The Uc Davis Foundation

The mission of the uc davis foundation is to secure, steward and manage private gifts for uc davis.

Education
5
Stony Brook Surgical Associates University Faculty Practice Corporation

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
6
President-Board of Trustees Santa Clara College

Scu is a catholic and jesuit institution that makes student learning its central focus, promotes faculty and staff learning in its various forms, and exhibits organizational learning.

Education
7
Stony Brook Urology University Faculty Practice Corporation

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
8
Stony Brook Ophthalmology University Faculty Practice Corporation

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
9
President and Fellows of Harvard College

Undergraduate, graduate, and professional education and research across a broad array of academic domains.

Education
10
Stony Brook Childrens Services University Faculty Practice Corporation

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
11
Neurology Associates of Stony Brook University Faculty Practice Corp

Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.

Health
12
Golden Gate University

Golden gate university prepares individuals to lead and serve by providing high quality, practice-based educational programs in law, taxation, business and related professions - as a nonprofit institution - in an innovative and challenging…

Education
How this is measured
The grantee most central to the portfolio’s shape is Kipp Nyc Public Charter Schools; the most unlike its peers is Tragedy Assistance Program for Survivors Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
03the grantee network

41 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. 41 of the 64 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)
6
Early backer (in before they grew)
41/41
Grantees still filing
30/41
Grew since first funded

Where the money sits, by cause and then by grantee

Cornel University: $610,000 · OtherCornel UniversityMENLO SCHOOL: $330,000 · OtherMENLO SCHOOLVOLCAN MOUNTAIN FOUNDATION: $135,000 · OtherVOLCAN MOUNTAIN FOUNDATIONFAME: $108,000 · OtherFAMERoyersford United Methodist Church: $70,000 · OtherSAN MATEO COUNTY HISTORICAL ASSOCIATION: $70,000 · OtherVerified Voting Foundation: $65,000 · Other+25 more: $393,500 · Other+25 moreCornell University: $310,000 · EducationCornell UniversityCASTILLEJA SCHOOL FOUNDATION: $241,000 · EducationCASTILLEJA SCHOOL FOUNDATIONCOLLEGE TRACK: $125,000 · EducationCOLLEGE TRACKUniversity of Chicago: $125,000 · EducationUniversity of ChicagoKIPP BAY AREA SCHOOLS: $100,000 · EducationKIPP BAY AREA SCHOOLSTHE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY: $100,000 · EducationTHE BOARD OF TRUSTEES OF THE LELAN…Fordham University: $50,050 · Education+4 more: $47,500 · EducationAVENIDAS: $230,000 · Human Services+1 more: $5,000 · Human ServicesCHILD MIND INSTITUTE INC: $75,000 · HealthAMYOTROPHIC LATERAL SCLEROSIS ASSN: $25,000 · HealthSTEADMAN PHILIPPON RESEARCH INSTITUTE: $25,000 · HealthPLANNED PARENTHOOD MAR MONTE INC: $20,000 · HealthCOLORECTAL CANCER ALLIANCE: $15,000 · HealthPLANNED PARENTHOOD FEDERATION OF AMERICA INC: $15,000 · HealthCHILDREN'S HEALTH COUNCIL INC: $10,000 · Health+2 more: $10,000 · HealthSAN FRANCISCO MUSEUM OF MODERN ART: $106,300 · Arts & CulturePBS FOUNDATION: $50,000 · Arts & CultureEMBARCADERO MEDIA FOUNDATION: $25,000 · Arts & Culture+2 more: $10,000 · Arts & CulturePEPPERWOOD FOUNDATION: $60,000 · EnvironmentSAN DIEGUITO RIVER VALLEY LAND CONSERVANCY: $48,250 · EnvironmentSIERRA CLUB FOUNDATION: $25,000 · EnvironmentELIZABETH F GAMBLE GARDEN: $5,000 · EnvironmentCalMatters: $20,000 · Civil Rights
Other$1,781,500Education$1,098,550Human Services$235,000Health$195,000Arts & Culture$191,300Environment$138,250Civil Rights$20,000

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 budgetMENLO SCHOOL: $330,000 over 5y, 0.2% of budgetCornell University: $310,000 over 2y, 0.0% of budgetCASTILLEJA SCHOOL FOUNDATION: $241,000 over 4y, 0.3% of budgetAVENIDAS: $230,000 over 5y, 0.9% of budgetVOLCAN MOUNTAIN FOUNDATION: $135,000 over 2y, 3.7% of budgetCOLLEGE TRACK: $125,000 over 1y, 0.2% of budgetUniversity of Chicago: $125,000 over 5y, 0.0% of budgetSAN FRANCISCO MUSEUM OF MODERN ART: $106,300 over 3y, 0.1% of budgetKIPP BAY AREA SCHOOLS: $100,000 over 3y, 0.0% of budgetTHE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY: $100,000 over 2y, 0.0% of budgetCHILD MIND INSTITUTE INC: $75,000 over 2y, 0.1% of budgetSAN MATEO COUNTY HISTORICAL ASSOCIATION: $70,000 over 5y, 0.9% of budgetVerified Voting Foundation: $65,000 over 4y, 1.2% of budgetPEPPERWOOD FOUNDATION: $60,000 over 2y, 1.2% of budgetFordham University: $50,050 over 1y, 0.0% of budgetPBS FOUNDATION: $50,000 over 1y, 0.2% of budgetSAN DIEGUITO RIVER VALLEY LAND CONSERVANCY: $48,250 over 3y, 3.9% of budgetEMBARCADERO MEDIA FOUNDATION: $25,000 over 1y, 0.3% of budgetSIERRA CLUB FOUNDATION: $25,000 over 1y, 0.0% of budgetAMYOTROPHIC LATERAL SCLEROSIS ASSN: $25,000 over 1y, 0.0% of budgetTHE GIRLS' MIDDLE SCHOOL: $25,000 over 1y, 0.3% of budgetSTEADMAN PHILIPPON RESEARCH INSTITUTE: $25,000 over 1y, 0.2% of budgetCANCER RESEARCH AND TREATMENT FUND INC: $25,000 over 1y, 2.4% of budgetPLANNED PARENTHOOD MAR MONTE INC: $20,000 over 4y, 0.0% of budgetCalMatters: $20,000 over 2y, 0.1% of budgetCOLORECTAL CANCER ALLIANCE: $15,000 over 3y, 0.0% of budgetPLANNED PARENTHOOD FEDERATION OF AMERICA INC: $15,000 over 1y, 0.0% of budgetEAST PALO ALTO TENNIS & TUTORING: $11,000 over 2y, 0.3% of budgetFLORIDA INTERNATIONAL UNIVERSITY FOUNDATION INC: $10,000 over 1y, 0.0% of budgetSIGMA PI EDUCATIONAL FOUNDATION INC: $10,000 over 1y, 0.9% of budgetTHE PENINSULA BRIDGE PROGRAM: $10,000 over 1y, 0.2% of budgetCHILDREN'S HEALTH COUNCIL INC: $10,000 over 1y, 0.0% of budgetROBIN HOOD FOUNDATION: $7,500 over 1y, 0.0% of budget42ND STREET MOON: $5,000 over 1y, 0.5% of budgetTHE FIT KIDS FOUNDATION INC: $5,000 over 1y, 0.8% of budgetPRO PUBLICA INC: $5,000 over 1y, 0.0% of budgetAMERICAN FOUNDATION FOR SUICIDE PREVENTION: $5,000 over 1y, 0.0% of budgetELIZABETH F GAMBLE GARDEN: $5,000 over 4y, 0.1% of budgetTRAGEDY ASSISTANCE PROGRAM FOR SURVIVORS INC: $5,000 over 1y, 0.0% of budgetFAIRVOTE WASHINGTON FOUNDATION: $5,000 over 1y, 1.2% of budgetKIPP NYC PUBLIC CHARTER SCHOOLS: $2,500 over 1y, 0.0% 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.

Silicon Valley Commun…Jewish Community Fede…Marin Community Found…Gs Donor Advised Phil…The Bisconti Family F…The San Francisco Fou…Morgan Stanley Global…The William & Flora H…The Bessemer Giving F…The Ayco Charitable F…Stephen S Smith and P…Tomlinson Family Foun…
Silicon Valley Community FoundationCA20.8× affinity11 shared granteesties to 11 of 11Hover any node to trace its alignments.Compare side by side →

Open a dossier: Silicon Valley Community Foundation · Jewish Community Federation of San Francisco the Peninsula Marin & Sonoma · Marin Community Foundation · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · The Bisconti Family Foundation · The San Francisco Foundation · Morgan Stanley Global Impact Funding Trust Inc · The William & Flora Hewlett Foundation · The Bessemer Giving Fund · The Ayco Charitable Foundation · Stephen S Smith and Paula K Smith Family Foundation · Tomlinson Family 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.

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 64 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 2024, released 2024. Filings run roughly 12 to 24 months behind; figures are dated accordingly.

Possibly out of date. A more recent filing (FY2025) is on record and reports $1.2M of grant expense with no grantee named in the published copy. A private foundation itemizes every grant it makes, so a return carrying none has filed its list as an attachment that the public copy does not include. The figures above are therefore from FY2024, the most recent year this funder’s grantee list reached the public record.

Source object · view filing

Play a game based on Michael and Paula Rantz’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