California · Nonprofit
RIVERSTYX FOUNDATION
RIVERSTYX FOUNDATION (California) receives grants from 6 organizations whose IRS filings report $390,567 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($281,358). 1 of them have funded it in more than one year, and 78% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2024
- $1.2M
- Funders on record
- 6
- Grants received
- $391k
- Net assets
- $6.5M
What Riverstyx Foundation does
Program
To support other qualified charities deemed appropriate by the board of trustees. The board made charitable contributions to 46 different charities during 2024.
$674,416 spent
The program described on its FY2024 Form 990-PF.
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. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2022 to 2023, from $30M to $7.4M (−75%).
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Who funds it, year by year
2018 → 2023: the base held at 1 funder, grant income rose $21k → $255k.
2 of 6 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 78% 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 RIVERSTYX FOUNDATION’s funders (the co-funder graph). 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
RIVERSTYX FOUNDATION leans on a few funders — its largest provides 72% of grant income and the top three 85%; 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 RIVERSTYX FOUNDATION.
Largest funder’s share by year: 2018 100% · 2019 100% · 2021 100% · 2022 100% · 2023 100% — broadly stable.
“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.
Where its funders are
78% of RIVERSTYX FOUNDATION'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 $84k that is directly attributable, 100% of it comes from funders outside California, across 4 states.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $306k arriving through sponsors registered in 2 states is 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.
Against its field
RIVERSTYX FOUNDATION is better cushioned than half of the 5,127 arts & culture nonprofits its size.
this organization peer median middle 50% of peers· 5,127 arts & culture nonprofits $1M–$10M, FY2024
Organizations like RIVERSTYX FOUNDATION
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In California
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 RIVERSTYX FOUNDATION: 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. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds RIVERSTYX FOUNDATION?
- RIVERSTYX FOUNDATION (California) receives grants from 6 organizations whose IRS filings report $390,567 to it, the largest being FIDELITY INVESTMENTS CHARITABLE GIFT FUND ($281,358). 1 of them have funded it in more than one year, and 78% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does RIVERSTYX FOUNDATION have?
- IRS filings report 6 organizations giving $390,567 in grants to RIVERSTYX FOUNDATION, 1 of which have funded it in more than one year.
- Who is the largest funder of RIVERSTYX FOUNDATION?
- FIDELITY INVESTMENTS CHARITABLE GIFT FUND is the largest funder on record, with $281,358 in grants. The full list of funders is on this page.
- How can an organization like RIVERSTYX FOUNDATION find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in California. 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 FY2024 (financials across 2017–2024), and the filings of 6 funders 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 October 14, 2026. What this page cannot tell you · view filing