Arizona · Nonprofit
Skystone Foundation Inc
Skystone Foundation Inc (Arizona) receives grants from 24 organizations whose IRS filings report $72,678,250 to it, the largest being CALIFORNIA COMMUNITY FOUNDATION ($51,400,000). 6 of them have funded it in more than one year, and 81% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
Three funders worth looking at
Grantmakers with no record of funding this organization, ranked by how strongly the co-funder graph and the mission embeddings agree. The evidence is in section 03.
- Women Donors Networkshared funders
- Utah Humanities Councilportfolio match
- Southwest Foundation for Education & Historical Preservationportfolio match
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended.
Who funds it, year by year
2017 → 2023: the base broadened from 5 funders to 6 funders, grant income rose $360k → $2.0M.
11 of 24 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 81% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of Skystone Foundation Inc’s funders (the co-funder graph). Top 23 of 24 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
Skystone Foundation Inc leans on a few funders — its largest provides 71% of grant income and the top three 88%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
88% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund Skystone Foundation Inc.
Largest funder’s share by year: 2017 28% · 2018 56% · 2019 71% · 2020 96% · 2021 92% · 2022 81% · 2023 76% — growing more concentrated.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
50% of Skystone Foundation Inc's funders are still giving 3 years after their first grant; 25% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
81% of Skystone Foundation Inc's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Of the $14M that is directly attributable, 100% of it comes from funders outside Arizona, across 7 states.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $59M arriving through sponsors registered in 6 statesis excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Funders to approach
Grantmakers that don’t fund you yet, surfaced two ways: they back organizations that share your funders, or their grantees resemble your mission. The ones both signals agree on come first. Your 24 funders put you under-funded among the 400 organizations that share them.
- Women Donors Networkshared fundersCA · backs 55 organizations that share your funders
- Utah Humanities Councilportfolio matchits grantees resemble your mission
- Southwest Foundation for Education & Historical Preservationportfolio matchits grantees resemble your mission
- Eleanor and Henry Hitchcock Charitable Foundationportfolio matchits grantees resemble your mission
- The Leon Smith Polk Foundation Incportfolio matchits grantees resemble your mission
- Al Held Foundation Incportfolio matchits grantees resemble your mission
- The James Howell Foundation Incportfolio matchits grantees resemble your mission
- The Curry Stone Foundationportfolio matchits grantees resemble your mission
- Sam Francis Foundationportfolio matchits grantees resemble your mission
- Frederick Hammersley Foundationportfolio matchits grantees resemble your mission
- Wade Family Foundationportfolio matchits grantees resemble your mission
- Solidaire Network Incshared fundersCA · backs 66 organizations that share your funders
From the co-funder graph (funders backing at least two comparable organizations, shrunk for grantee count, donor-advised and mega-funds excluded) and the universe embeddings. A research starting point; overlap is association, not a guarantee of fit.
Organizations like Skystone Foundation Inc
Nonprofits whose mission and program text most resemble this one, by semantic similarity over the universe of US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Arizona
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Screen this organization
A dated, signed PDF of the compliance screen for Skystone Foundation Inc: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds Skystone Foundation Inc?
- Skystone Foundation Inc (Arizona) receives grants from 24 organizations whose IRS filings report $72,678,250 to it, the largest being CALIFORNIA COMMUNITY FOUNDATION ($51,400,000). 6 of them have funded it in more than one year, and 81% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does Skystone Foundation Inc have?
- IRS filings report 24 organizations giving $72,678,250 in grants to Skystone Foundation Inc, 6 of which have funded it in more than one year.
- Who is the largest funder of Skystone Foundation Inc?
- CALIFORNIA COMMUNITY FOUNDATION is the largest funder on record, with $51,400,000 in grants. The full list of funders is on this page.
- How can an organization like Skystone Foundation Inc find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Arizona. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 24funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported August 27, 2026. What this page cannot tell you · view filing