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Milton & Harriet Sioles Family Foundation at a glance

· Private foundation

Milton & Harriet Sioles Family 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.

$146k
Granted FY2025still arriving
4
Grants FY2025still arriving
2
States reached
$100k
Largest
01What it fundsRead
02The needRead
03Its granteesRead
04Its fieldRead
05Through PlinthRead
01What it funds
01100% classified

What it funded, over time

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

Health$1.5MEducation$70kReligion$31kFood & Nutrition$5kPhilanthropy$2k
02FY2025 · 4 grants

Where the money goes

Grants by size, and the largest recipients.

By grant size · FY2025

  • $10k–50k3 grants · $46k
  • $50k–250k1 grant · $100k
$25,000
Median grant
2
States reached
$3.0M
Total assets
Largest grants
RecipientAmount
MAYO CLINIC$100,000
STEPHEN SILLER TUNNEL TO TOWERS FOUNDATION$25,000
MOST HOLY TRINITY ROMAN CATHOLIC PARISH PHOENIX$11,000
TUCSON TORAH DAY SCHOOL$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:

Its human-services grants (FY20–20, $10k) land where the poverty rate runs at 11%, against an area that typically sits at 11%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of its grants land in higher-need ZIPs.

area typical 11%HOSPICE OF THE VALLEY: $10k → 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.

90%of every dollar goes to organizations it has funded before.
$1.4M · 4 repeat orgs$151k to everyone else

Grantees it renews have grown median revenue +392% since the first grant, against +41% for those funded once.

4 repeat relationships: 3 still active in FY2025, 1 since wound down; 1 grantees were first funded in FY2025 (too recent to call).

How the two cohorts compare

Re-uppedFunded once

Organizations

4
9

Total granted

$1.4M
$141k

Median revenue growth · since first grant

+392%
+41%

Still filing today

50%
56%

New vs renewed · share of each year

In FY2025, 93% of grant dollars renewed an existing relationship; $10k went to new ones.

50%100%’17’18’19’20’21’22’23’24’25
RenewedFirst-time

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

’17’18’19’20’21’22’23’24’25
HealthEducationHuman 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

  • MC
    MAYO CLINIC
    8× · 2018–2025 · $685k
  • PC
    Phoenix Children's Hospital Foundation
    7× · 2018–2024 · $658k · revenue +52%
  • STEPHEN SILLER TUNNEL TO TOWERS FOUNDATION
    3× · 2020–2025 · $60k · revenue +392%

Funded once

  • PC
    Phoenix Children's Hospitalgraduated
    one grant, 2017 · $115k · revenue +98%
  • HO
    Hospice of the Valleygraduated
    one grant, 2020 · $10k · revenue +41%
  • SM
    ST MICHAELS CHAPEL AND MISSION INC
    one grant, 2020 · $5k
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
Honorhealth

Honorhealth's mission is to improve the health and well-being of those we serve.

Health
2
Children's Health Care

We champion the health needs of children and families. we are committed to improving children's health by providing the highest-quality, family centered care, advanced through research and education.

Health
3
The Shriners' Hospital for Children

Shriners children's is committed to compassionate, high-quality care that improves children's lives, in a family-centered and collaborative environment. (continued on schedule o)

Health
4
East Tennessee Children's Hospital Association Inc

East tennessee children's hospital is a free-standing, independent, not-for-profit pediatric health care system which serves the east tennessee region. children's hospital is certified by the state of tennessee as a comprehensive regional…

Health
5
Children's Hospital & Research Center At Oakland

The mission of children's hospital & research center at oakland is to protect and advance the health and well-being of children through clinical care, teaching and research.

Health
6
Memorial Sloan-Kettering Cancer Center

Leadership in the prevention, treatment, and cure of cancer through excellence, vision and cost effectiveness in patient care, outreach programs, research, and education.

Health
7
Children's Clinics for Rehabilitative Services

The children's clinics provides a family centered comprehensive medical home to meet the special needs of children and families.

Health
8
The Children's Hospital of Philadelphia

The children's hospital of philadelphia, the oldest hospital in the united states dedicated exclusively to pediatrics, strives to be the world leader in the advancement of health care for children by integrating excellent patient care,…

Health
9
The Translational Genomics Research Institute

Please see schedule o

Health
10
Children's Hospital Corporation

Provider of pediatric healthcare, education, research & community service

Health
11
Shriners Hospital for Children
Philanthropy
12
The Johns Hopkins Hospital

For more than 125 years, the mission of the johns hopkins hospital has been to lead the world in the diagnosis and treatment of disease and to train tomorrow's great physicians, nurses and scientists. above all, we aim to provide the…

Health
How this is measured
The grantee most central to the portfolio’s shape is Shriners Hospitals for Children; the most unlike its peers is Tucson Torah Day School. 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 15 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
8/9
Grew since first funded

Where the money sits, by cause and then by grantee

Phoenix Children's Hospital Foundation: $657,500 · HealthPhoenix Children's Hospital FoundationPhoenix Children's Hospital: $115,000 · HealthPhoenix Children's HospitalMAYO CLINIC: $65,000 · HealthMAYO CLINIC+2 more: $2,000 · HealthMAYO CLINIC: $685,000 · OtherMAYO CLINIC+5 more: $35,500 · OtherSTEPHEN SILLER TUNNEL TO TOWERS FOUNDATION: $60,000 · EducationTUCSON TORAH DAY SCHOOL: $10,000 · EducationHospice of the Valley: $10,000 · Human ServicesAMERICA GIVES INC: $1,500 · Philanthropy
Health$839,500Other$720,500Education$70,000Human Services$10,000Philanthropy$1,500

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

25%50%75%100%$100Mgrantee revenue →↑ funder's share of their budgetPhoenix Children's Hospital Foundation: $657,500 over 7y, 0.3% of budgetPhoenix Children's Hospital: $115,000 over 1y, 0.0% of budgetMAYO CLINIC: $65,000 over 1y, 0.0% of budgetSTEPHEN SILLER TUNNEL TO TOWERS FOUNDATION: $60,000 over 3y, 0.0% of budgetHospice of the Valley: $10,000 over 1y, 0.0% of budgetAMERICA GIVES INC: $1,500 over 1y, 0.0% of budgetSHRINERS HOSPITALS FOR CHILDREN: $1,000 over 1y, 0.0% of budgetALZHEIMER'S DISEASE & RELATED DISORDERS ASSOCIATION INC: $1,000 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.

  • Who funds Phoenix Children's Hospital Foundation ↗
  • Who funds Phoenix Children's Hospital ↗
  • Who funds MAYO CLINIC ↗
  • Who funds STEPHEN SILLER TUNNEL TO TOWERS FOUNDATION ↗
  • Who funds Hospice of the Valley ↗
  • Who funds TUCSON TORAH DAY SCHOOL ↗
  • Who funds AMERICA GIVES INC ↗
  • Who funds SHRINERS HOSPITALS FOR CHILDREN ↗
  • Who funds ALZHEIMER'S DISEASE & RELATED DISORDERS ASSOCIATION INC ↗

How much its grantees rely on government

Each dot is one organization Milton & Harriet Sioles Family Foundation funds: left to right is the share of its income from government, bottom to top the share from Milton & Harriet Sioles Family Foundation. Bigger dots raise more.

2024
’20’21’22’23’24
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 →median 0%
  • Shriners Hospitals for Children: 0% of income from government
no gov moneyreceives it· size = income
0get no government money at all
1report 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, FY20–24
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 Milton & Harriet Sioles Family Foundation?

Find your warmest path to Milton & Harriet Sioles Family 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 15 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
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