California · Nonprofit
MONTESSORI SCHOOL OF SONOMA INCORPORATED
MONTESSORI SCHOOL OF SONOMA INCORPORATED (California) receives grants from 2 organizations whose IRS filings report $7,260 to it, the largest being HEFFERNAN GROUP FOUNDATION ($6,850). 1 of them have funded it in more than one year.
- Revenue FY2025
- $1.3M
- Funders on record
- 2
- Grants received
- $7k
- Net assets
- $439k
What Montessori School of Sonoma Incorporated does
Mission
To operate a licenced Montessori School for students 12 months to 10 years old.
As stated on its FY2025 Form 990.
Programs
To operate a licenced Montessori School serving children 12 months to 10 years
$1,301,256 spent$1,285,475 earned by the program100% of program spendingNo second
$0 spent0% of program spendingNone
$0 spent0% of program spendingOther program services, not described on the e-filed return.
$0 spent0% of program spending
The 4 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $1,301,256.
The organization over time
Each line starts at 100 in 2021, so what you read is the shape rather than the size: 150 means half as much again as 2021, 50 means half. The number beside each label in the key is where it ended.
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 $509k to $647k (+27%).
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.
Government-grant reliance: 2021 10% · 2022 0% · 2023 0%. Grants only. Government contracts and fees sit inside program revenue.
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 5 reported years ran a deficit.
reserve
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
2020 → 2023: the base held at 1 funder, grant income fell $7k → $136.
1 of 2 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 6% 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 MONTESSORI SCHOOL OF SONOMA INCORPORATED’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
MONTESSORI SCHOOL OF SONOMA INCORPORATED leans on a few funders — its largest provides 94% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
Largest funder’s share by year: 2020 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
100% of MONTESSORI SCHOOL OF SONOMA INCORPORATED's grant income comes from California funders.
Funder states come from each funder’s own filing. $410 arriving through sponsors registered in 1 state 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.
Organizations like MONTESSORI SCHOOL OF SONOMA INCORPORATED
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.
Where the money goes
100% of spending goes to programs.
Governance
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for MONTESSORI SCHOOL OF SONOMA INCORPORATED: 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 MONTESSORI SCHOOL OF SONOMA INCORPORATED?
- MONTESSORI SCHOOL OF SONOMA INCORPORATED (California) receives grants from 2 organizations whose IRS filings report $7,260 to it, the largest being HEFFERNAN GROUP FOUNDATION ($6,850). 1 of them have funded it in more than one year.
- How many funders does MONTESSORI SCHOOL OF SONOMA INCORPORATED have?
- IRS filings report 2 organizations giving $7,260 in grants to MONTESSORI SCHOOL OF SONOMA INCORPORATED, 1 of which have funded it in more than one year.
- Who is the largest funder of MONTESSORI SCHOOL OF SONOMA INCORPORATED?
- HEFFERNAN GROUP FOUNDATION is the largest funder on record, with $6,850 in grants. The full list of funders is on this page.
- How can an organization like MONTESSORI SCHOOL OF SONOMA INCORPORATED 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 Montessori School of Sonoma →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2021–2025), and the filings of 2 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