California · Nonprofit
SONOMA COUNTY PHILHARMONIC
SONOMA COUNTY PHILHARMONIC (California) receives grants from 7 organizations whose IRS filings report $136,769 to it, the largest being MARIN COMMUNITY FOUNDATION ($64,900). 2 of them have funded it in more than one year, and 85% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $100k
- Funders on record
- 7
- Grants received
- $137k
- Net assets
- $99k
What Sonoma County Philharmonic does
Mission
The Sonoma County Philharmonic serves as a community based model for small regional orchestras. All members serve on a volunteer basis and perform 4-5 free concerts per year. Pro forma performing costs are maintained for comparison to traditional orchestra models.
As stated on its FY2025 Form 990-EZ.
Programs
Individual grants - musicians
$96,713 spent100% of program spendingPublic concerts & events expenses
The 2 programs described on its FY2024 Form 990-EZ. Program spending in total: $96,713.
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 at each year end, in dollars. The largest one-year move in total assets was 2019 to 2020, from $38k to $74k (+94%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
97% of SONOMA COUNTY PHILHARMONIC’s revenue is contributions — more reliant on donations than three-quarters of its peers (64% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 9 reported years ran a deficit.
Leadership and staff
Chief executive
Stephen Peterson
President & CEO
As listed on its FY2024 Form 990-EZ.
Who funds it, year by year
2020 → 2023: the base narrowed from 5 funders to 1 funder, grant income fell $30k → $97.
4 of 7 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 85% 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 SONOMA COUNTY PHILHARMONIC’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
SONOMA COUNTY PHILHARMONIC leans on a few funders — its largest provides 47% of grant income and the top three 95%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
85% 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 SONOMA COUNTY PHILHARMONIC.
Largest funder’s share by year: 2020 67% · 2021 55% · 2022 100% · 2023 100% — 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.
Where its funders are
85% of SONOMA COUNTY PHILHARMONIC'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 $21k that is directly attributable, 97% of it comes from California funders.
Funder states come from each funder’s own filing. $116k arriving through sponsors registered in 3 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
SONOMA COUNTY PHILHARMONIC's revenue grew 29% between 2017 and 2025.
this organization peer median middle 50% of peers· 11,634 arts & culture nonprofits $100k–$1M, FY2025
Organizations like SONOMA COUNTY PHILHARMONIC
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.
Public support
100%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for SONOMA COUNTY PHILHARMONIC: 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 SONOMA COUNTY PHILHARMONIC?
- SONOMA COUNTY PHILHARMONIC (California) receives grants from 7 organizations whose IRS filings report $136,769 to it, the largest being MARIN COMMUNITY FOUNDATION ($64,900). 2 of them have funded it in more than one year, and 85% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does SONOMA COUNTY PHILHARMONIC have?
- IRS filings report 7 organizations giving $136,769 in grants to SONOMA COUNTY PHILHARMONIC, 2 of which have funded it in more than one year.
- Who is the largest funder of SONOMA COUNTY PHILHARMONIC?
- MARIN COMMUNITY FOUNDATION is the largest funder on record, with $64,900 in grants. The full list of funders is on this page.
- How can an organization like SONOMA COUNTY PHILHARMONIC 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.
Play a game about who funds Sonoma County Philharmonic →
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 7 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