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Steven Prewitt Skull Base Disease Foundation at a glance

· Private foundation

Steven Prewitt Skull Base Disease 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.

$51k
Granted FY2025still arriving
4
Grants FY2025still arriving
2
States reached
$16k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
0194% classified

What it funded, over time

Every grant placed by its stated purpose and the recipient’s mission, by year, FY2018 to 2025.

Health$205kArts & Culture$51kInternational$15kEducation$5kPublic Benefit$5kOther$0
02FY2025 · 4 grants

Where the money goes

Grants by size, and the largest recipients.

$15,000
Median grant
2
States reached
$780k
Total assets
Largest grants
RecipientAmount
SCRIPPS HEALTH FOUNDATION$15,800
RESOURCE EXCHANGE INTERNATIONAL INC$15,000
SAN DIEGO AUTOMOTIVE MUSEUM$10,000
SAN DIEGO AIR & SPACE MUSEUM$10,000
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:

Dollar for dollar, its grants (FY18–25) land where the poverty rate runs at 11%, against an area that typically sits at 11%. 93% of its dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 11%SHARP HEALTHCARE FOUNDATION: $34k → 11%NORTH AMERICAN SKULL BASE SOCIETY: $30k → 14%RESOURCE EXCHANGE INTERNATIONAL INC: $15k → 9%SHARP HEALTHCARE FOUNDATION: $24k → 11%NORTH AMERICAN SKULL BASE SOCIETY: $24k → 14%SCRIPPS MERCY HOSPITAL FOUNDATION: $15k → 11%SAN DIEGO AUTO MUSEUM: $10k → 11%SD SPACE AIR MUSEUM: $8k → 11%SCRIPPS HEALTH FOUNDATION: $16k → 11%SPIRIT OF LIBERTY FOUNDATION: $5k → 11%UC SAN DIEGO FOUNDATION: $5k → 11%SAN DIEGO AUTOMOTIVE MUSEUM: $10k → 11%SAN DIEGO AIR & SPACE MUSEUM: $10k → 11%SAN DIEGO AUTOMOTIVE MUSEUM: $10k → 11%SAN DIEGO AIR & SPACE MUSEUM: $4k → 11%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.

73%of every dollar goes to organizations it has funded before.
$208k · 5 repeat orgs$78k to everyone else

Grantees it renews have grown median revenue +22% since the first grant, against +20% for those funded once.

5 repeat relationships: 2 still active in FY2025, 3 since wound down; 2 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

5
6

Total granted

$208k
$48k

Median revenue growth · since first grant

+22%
+20%

Still filing today

100%
33%

New vs renewed · share of each year

In FY2025, 39% of grant dollars renewed an existing relationship; $31k went to new ones.

50%100%’18’19’20’21’22’23’24’25
RenewedFirst-time

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

’18’19’20’21’22’23’24’25
HealthArts & CultureInternationalEducationPublic BenefitOther
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

  • GH
    Grossmont Hospital Foundation
    2× · 2022–2023 · $63k · revenue +22%
  • SH
    Sharp Healthcare Foundation
    2× · 2020–2021 · $58k · revenue +29%
  • NA
    NORTH AMERICAN SKULL BASE SOCIETY
    2× · 2018–2019 · $54k · revenue +71%

Funded once

  • SM
    SCRIPPS MERCY HOSPITAL FOUNDATION
    one grant, 2024 · $15k
  • SD
    SAN DIEGO AUTO MUSEUM
    one grant, 2024 · $10k
  • SS
    SD SPACE AIR MUSEUM
    one grant, 2024 · $8k
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
Sharp Memorial Hospital

Sharp Memorial Hospital provides comprehensive medical services to the San Diego Community.

Health
2
Sharp Coronado Hospital & Healthcare Center

To operate and maintain a general acute care hospital and related facilities for the acute care of persons suffering from illnesses or disabilities, and for the continuing care of persons needing rehabilitation and the custodial care of…

—
3
Grossmont Hospital Corporation

Grossmont Hospital provides inpatient and outpatient medical services to the community.

Health
4
Sutter Bay Hospitals

MISSION STATEMENT: MISSION: CARING FOR OUR PATIENTS FIRST AND OUR PEOPLE ALWAYS. VISION: TO BE THE MOST COMPREHENSIVE, INTEGRATED AND CONNECTED HEALTH SYSTEM FOR GETTING AND STAYING WELL. VALUES: EXCELLENCE - We deliver high-quality,…

Health
5
Sharp Healthcare

To promote health care through supporting and/or operating, directly or through wholly-owned subsidiaries and other appropriate management arrangements, hospitals and other medically-related facilities and activities in the State of…

Health
6
American Museum of Natural History

The museum's mission statement is: "to discover, interpret, and disseminate - through scientific research and education - knowledge about human cultures, the natural world, and the universe."

Arts & Culture
7
Sharp Chula Vista Medical Center

Sharp chula vista medical center provides inpatient and outpatient medical services to the community.

Health
8
Schmidt Ocean Institute
Science & Tech
9
San Diego Society of Natural History

Conserving nature through science and discovery.

Arts & Culture
10
University of Southern California

The central mission of the university of southern california is the development of human beings and society as a whole through the cultivation and enrichment of the human mind and spirit. the principal means by which our mission is…

Education
11
Sutter Bay Medical Foundation

Mission statement: mission: caring for our patients first and our people always. vision: to be the most comprehensive, integrated and connected health system for getting and staying well. values: excellence - we deliver high-quality,…

Health
12
Coronado Hospital Foundation

Coronado hospital foundation is a non profit benefit corporation dedicated to enhancing the health of the community by supporting solutions to coronado's unique health care needs.

Health
How this is measured
The grantee most central to the portfolio’s shape is Uc San Diego Foundation; the most unlike its peers is Resource Exchange International Inc. 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

9 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. 9 of the 13 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)
1
Early backer (in before they grew)
9/9
Grantees still filing
6/9
Grew since first funded

Where the money sits, by cause and then by grantee

Grossmont Hospital Foundation: $63,000 · HealthGrossmont Hospital FoundationSharp Healthcare Foundation: $57,500 · HealthSharp Healthcare FoundationNORTH AMERICAN SKULL BASE SOCIETY: $54,000 · HealthNORTH AMERICAN SKULL BASE SOCIETYSCRIPPS HEALTH: $15,800 · HealthSCRIPPS HEALTHSCRIPPS MERCY HOSPITAL FOUNDATION: $15,000 · OtherSCRIPPS MERCY …SAN DIEGO AUTO MUSEUM: $10,000 · OtherSAN DIEGO AUTO…SD SPACE AIR MUSEUM: $7,500 · OtherSD SPACE AIR M…Individual grant recipient: $5,000 · OtherIndividual gra…SAN DIEGO AUTOMOTIVE MUSEUM: $20,000 · Arts & CultureSAN DIEGO AUT…SAN DIEGO AIR & SPACE MUSEUM INC: $13,950 · Arts & CultureSAN DIEGO AIR…Resource Exchange International Inc: $15,000 · InternationalUC SAN DIEGO FOUNDATION: $5,000 · EducationTHE SPIRIT OF LIBERTY FOUNDATON: $5,000 · Public Benefit
Health$190,300Other$37,500Arts & Culture$33,950International$15,000Education$5,000Public Benefit$5,000

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

25%50%75%100%$10M$100Mgrantee revenue →↑ funder's share of their budgetGrossmont Hospital Foundation: $63,000 over 2y, 0.6% of budgetSharp Healthcare Foundation: $57,500 over 2y, 0.1% of budgetNORTH AMERICAN SKULL BASE SOCIETY: $54,000 over 2y, 2.6% of budgetSAN DIEGO AUTOMOTIVE MUSEUM: $20,000 over 2y, 0.5% of budgetSCRIPPS HEALTH: $15,800 over 1y, 0.0% of budgetResource Exchange International Inc: $15,000 over 1y, 0.6% of budgetSAN DIEGO AIR & SPACE MUSEUM INC: $13,950 over 2y, 0.1% of budgetUC SAN DIEGO FOUNDATION: $5,000 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.

Vanguard Charitable E…Donor Advised Charita…Fidelity Investments …Amazonsmile Foundation
Vanguard Charitable Endowment ProgramPA8.8× affinity4 shared granteesties to 3 of 3Hover any node to trace its alignments.Compare side by side →

Open a dossier: Vanguard Charitable Endowment Program · Donor Advised Charitable Giving 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 Steven Prewitt Skull Base Disease Foundation funds: left to right is the share of its income from government, bottom to top the share from Steven Prewitt Skull Base Disease Foundation. Bigger dots raise more.

2023
’20’21’22’23’24’25
no gov · 00%0%1%3%5%funder's share of their income ↑0%3%5%8%10%share of the org’s income from government →
    no gov moneyreceives it· size = income
    0get no government money at all
    3report 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 Steven Prewitt Skull Base Disease Foundation?

    Find your warmest path to Steven Prewitt Skull Base Disease 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.

    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 13 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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    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
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    $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