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California · Nonprofit

MARIN HORIZON SCHOOL INC

MARIN HORIZON SCHOOL INC (California) receives grants from 47 organizations whose IRS filings report $8,551,552 to it, the largest being LEONARD & BERYL BUCK FOUNDATION ($2,525,000). 28 of them have funded it in more than one year.

Revenue FY2025
$17M
Funders on record
47
Grants received
$8.6M
Net assets
$23M
28/47 repeat funderspeak grant-dependency 13%
01What it does

What Marin Horizon School Inc does

Mission

We ground students in a deep sense of belonging so they become enthusiastic learners, develop confident voices, and emerge as beacons of kindness in their communities.

As stated on its FY2025 Form 990.

Program

  1. Marin horizon school is an independent, coed day school for students in toddler through grade 8. Located in mill valley, california, our curriculum is designed to inspire students to embrace challenges, think critically, and become compassionate advocates. We prioritize class sizes to allow the development of exceptional teacher-student relationships and individualized attention. Within our inclusive community, every student is seen, heard, and valued, fostering a sense of ownership over their education and an exploration of their unique interests.

    $12,260,038 spentof which $2,575,275 as grants$12,308,707 earned by the program
    100% of program spending

The program described on its FY2024 Form 990. Program spending in total: $12,260,038.

02The organization over time

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.

100 = 20172017 Revenue 100 ($11M) Expenses 100 ($10M) Net assets 100 ($9.8M)2018 Revenue 104 ($11M) Expenses 106 ($11M) Net assets 108 ($11M)2019 Revenue 104 ($11M) Expenses 101 ($10M) Net assets 116 ($11M)2020 Revenue 108 ($12M) Expenses 107 ($11M) Net assets 123 ($12M)2021 Revenue 122 ($13M) Expenses 113 ($12M) Net assets 162 ($16M)2022 Revenue 118 ($13M) Expenses 119 ($12M) Net assets 156 ($15M)2023 Revenue 125 ($14M) Expenses 126 ($13M) Net assets 170 ($17M)2024 Revenue 149 ($16M) Expenses 136 ($14M) Net assets 203 ($20M)2025 Revenue 154 ($17M) Expenses 142 ($15M) Net assets 231 ($23M)
'17'18'19'20'21'22'23'24'25
Revenue (154)Expenses (142)Net assets (231)Peer revenue range

Balance sheet

Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2019 to 2020, from $31M to $34M (+12%).

$29M
$29M
$31M
$34M
$38M
$41M
$43M
$46M
$50M
'17'18'19'20'21'22'23'24'25
Total assetsTotal liabilities

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.

2017
2018
2019
2020
2021
2022
2023
2024
2025
ContributionsProgram revenueInvestmentOther

Government-grant reliance: 2022 2% · 2024 7% · 2025 8%. Grants only. Government contracts and fees sit inside program revenue.

22% of MARIN HORIZON SCHOOL INC’s revenue is contributions — about as donation-reliant as the typical peer (23% for the typical peer).

This organization
Typical peer · 4,251 orgs

Surplus & reserves

Operating surplus or deficit each year, and months of liquidity in hand. 0 of the last 9 reported years ran a deficit.

$703k
’17
$488k
’18
$1.0M
’19
$930k
’20
$1.8M
’21
$684k
’22
$829k
’23
$2.4M
’24
$2.3M
’25
4.6
months of
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.

Board chair

Peter Bryan

Chair

As listed on its FY2025 Form 990.

'17'18'19'20'21'22'23'24'25
Listed252526222525262726
Joined·+9+6+3+6+11+5+5+6
No longer listed·957311447
03Who funds it

Who funds it, year by year

2017 → 2023: the base broadened from 7 funders to 27 funders, grant income rose $162k → $1.8M.

16 of 47 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 42% 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 MARIN HORIZON SCHOOL INC’s funders (the co-funder graph). Top 30 of 47 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

MARIN HORIZON SCHOOL INC has a broad base — no single funder exceeds 30% of grant income, and it takes 4 funders to reach half.

the vertical line marks half of all grant income — 4 funders to its left

76% 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 MARIN HORIZON SCHOOL INC.

30%
largest funder
49%
top three
~8
effective funders

Largest funder’s share by year: 2017 27% · 2018 48% · 2019 60% · 2020 50% · 2021 36% · 2022 28% · 2023 20% — diversifying over time.

“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

71% of MARIN HORIZON SCHOOL INC's funders are still giving 3 years after their first grant; 60% give in more than one year at all.

first grant+1y+2y+3y+4y+5y+6y

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

MARIN HORIZON SCHOOL INC draws 61% of its grant income from funders outside California, across 13 states in all.

MN
IL
WI
NY
PA
CA
CO
MO
MD
NC
DC
GA
TX

In-state vs out-of-state, by year

’17
’18
’19
’20
’21
’22
’23
California out of state home

Funder states come from each funder’s own filing. $3.6M arriving through sponsors registered in 12 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.

04Its place in the field

Against its field

MARIN HORIZON SCHOOL INC runs a healthier operating margin than three-quarters of the 3,758 education nonprofits its size.

Operating margin14% · top quartile
Months of reserve4.6mo · above the median
Revenue growth (annualized)6% · below the median

this organization peer median middle 50% of peers· 3,758 education nonprofits $10M–$100M, FY2025

Organizations like MARIN HORIZON SCHOOL INC

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

05Profile & governance

Read directly from this organization’s own Form 990, as neutral context.

Where the money goes

84% of spending goes to programs.

Program 84%Management 13%Fundraising 3%

Governance

20
board members
85%
independent
✓Conflict-of-interest policy✓Whistleblower policy✓Document retention✓Board reviewed the 990✓Audited financials

Footprint & structure

Files a return copy in 1 state

CA

Screen this organization

A dated, signed PDF of the compliance screen for MARIN HORIZON SCHOOL 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.

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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 MARIN HORIZON SCHOOL INC?
MARIN HORIZON SCHOOL INC (California) receives grants from 47 organizations whose IRS filings report $8,551,552 to it, the largest being LEONARD & BERYL BUCK FOUNDATION ($2,525,000). 28 of them have funded it in more than one year.
How many funders does MARIN HORIZON SCHOOL INC have?
IRS filings report 47 organizations giving $8,551,552 in grants to MARIN HORIZON SCHOOL INC, 28 of which have funded it in more than one year.
Who is the largest funder of MARIN HORIZON SCHOOL INC?
LEONARD & BERYL BUCK FOUNDATION is the largest funder on record, with $2,525,000 in grants. The full list of funders is on this page.
How can an organization like MARIN HORIZON SCHOOL INC 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 Marin Horizon School →

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 47 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