California · Nonprofit
PENINSULA OPEN SPACE TRUST
PENINSULA OPEN SPACE TRUST (California) receives grants from 200 organizations whose IRS filings report $63,464,023 to it, the largest being GORDON E AND BETTY I MOORE FOUNDATION ($15,430,200). 139 of them have funded it in more than one year, and 54% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $62M
- Funders on record
- 200
- Grants received
- $63M
- Net assets
- $359M
What Peninsula Open Space Trust does
Mission
Post protects open space on the peninsula and in the south bay for the benefit of all. Post is creating a network of protected lands where people and nature connect and thrive. These lands are preserved forever so present and future generations benefit from the careful... Balance of rural and urban landscapes that make our region extraordinary.
As stated on its FY2025 Form 990.
Programs
Land acquisition & transfer:in fiscal year 2025, post completed and assisted a total of 9 transactions that protected 5,538 acres. Purchased 2,467 acres of sargent ranch in southern santa clara county, a key wildlife linkage and part of the juristac tribal cultural landscape. Purchased the 1,340-acre pescadero ranch adjacent to sargent ranch, rich in biodiversity and cultural importance. Purchased 503 acres through two transactions in the upper pajaro valley across santa clara and san benito counties, enhancing wildlife connectivity in this vital region... Purchased 207 acres on the northwestern ridge of coyote valley, adding to a network of protected lands that will help wildlife move between mountain ranges. Conserved an additional 365 acres of estrada ranch through a complex transaction in partnership with the land trust of santa cruz county and the estrada family. Assisted the conservation fund's purchase of the 586-acre san antonio ranch in san benito county, helping secure an essential connection with the gabilan range. Accepted a donation of 70 acres adjacent to bear creek redwoods for eventual incorporation into the preserve. Transferred 517 acres in coyote valley to the…
$21,084,293 spentof which $3,893,450 as grants60% of program spendingLand management:post currently holds 18,444 acres in fee ownership and holds conservation easements and deed restrictions on 15,024 acres. The organization has an established stewardship program for the lands it owns that includes resource conservation planning and management, along with active uses of land for conservation grazing and agriculture, sustainable forest management and restoration where appropriate, and development of compatible recreational opportunities. Post works to protect and manage lands in its possession through site-specific stewardship plans for the natural resources on each... Property as well as having broader community and regional impacts. Post staff and volunteers actively monitor the acreage on which post holds easements or restrictions. Volunteers also assist with stewardship projects on post-owned land. In total, post land volunteers contributed an impressive 1,634 hours of work time on post-protected land including conservation easement monitoring, participating in highway clean-ups, and mapping and treating invasive plants that degrade natural systems. These are some of the most impactful projects we implemented during fy25 to care for the lands we…
$10,671,661 spentof which $5,310,175 as grants$245,944 earned by the program30% of program spendingCommunity outreach and education:post continued our community growth and engagement efforts in fiscal year 2025 growing the list of community members by 36.4k new contacts. These contacts were gathered via content, general awareness paid advertising, social media, and events. Post's community database now includes 146k community members. This is 9% larger than the previous year. Content marketing campaigns (guides, blogs, general awareness, and annual giving) generated 67% of all new contacts, followed by outreach events at 28%. Contacts engage with the post website via the monthly email newsletter, which featured about 40 new stories over the year, as well as annual giving campaigns. The website saw 644k total... Users in fy 2025.post's social media following grew significantly due to paid advertising, content production, and experimentation. Collectively, our social media channels grew from 78k to 99k followers (+27% yoy). Overall there were 12% more impressions, 13% more reach, and 30% more "clicks" from paid social media which in turn led to increased engagement on post's website for downloads, informational visits, donations, and the like. Post hosted 100 public events that…
$3,391,004 spentof which $5,500 as grants$3,854 earned by the program10% of program spending
The 3 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $35,146,958.
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 2024 to 2025, from $339M to $374M (+10%).
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: 2017 1% · 2019 6% · 2020 1% · 2021 2% · 2022 2% · 2023 13% · 2024 2% · 2025 2%. Grants only. Government contracts and fees sit inside program revenue.
88% of PENINSULA OPEN SPACE TRUST’s revenue is contributions — more donation-reliant than the typical peer (87% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 8 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.
Board chair
Rajesh Mashruwala
Chair & director
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2023: the base broadened from 62 funders to 87 funders, grant income fell $6.4M → $6.2M.
33 of 200 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 54% 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 PENINSULA OPEN SPACE TRUST’s funders (the co-funder graph). Top 30 of 200 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
PENINSULA OPEN SPACE TRUST has a broad base — no single funder exceeds 24% of grant income, and it takes 3 funders to reach half.
the vertical line marks half of all grant income — 3 funders to its left
57% 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 PENINSULA OPEN SPACE TRUST.
Largest funder’s share by year: 2017 64% · 2018 39% · 2019 37% · 2020 23% · 2021 32% · 2022 27% · 2023 34% — 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
52% of PENINSULA OPEN SPACE TRUST's funders are still giving 3 years after their first grant; 70% 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
54% of PENINSULA OPEN SPACE TRUST'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 $29M that is directly attributable, 85% of it comes from California funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $34M arriving through sponsors registered in 15 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
PENINSULA OPEN SPACE TRUST runs a healthier operating margin than half of the 210 environment nonprofits its size.
this organization peer median middle 50% of peers· 210 environment nonprofits $10M–$100M, FY2025
Government funding PENINSULA OPEN SPACE TRUST receives
Grants and contracts to this organization from federal (USASpending) and state checkbooks, reconciled to its EIN. $2.0M on record.
- Department of Agriculture$2.0M
Federal grants vs contracts are distinguished; state line items keep their reported category. Matched by name + geography (the BMF), so coverage is partial and precision-first.
Organizations like PENINSULA OPEN SPACE TRUST
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
81% of spending goes to programs.
Governance
Public support
65%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 22 states
Part of a family of 3 related entities
- Verdantis LLC · disregarded
- Silvix LLC · disregarded
- Lake Lucerne Mutual Water Company · exempt
Screen this organization
A dated, signed PDF of the compliance screen for PENINSULA OPEN SPACE TRUST: 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 PENINSULA OPEN SPACE TRUST?
- PENINSULA OPEN SPACE TRUST (California) receives grants from 200 organizations whose IRS filings report $63,464,023 to it, the largest being GORDON E AND BETTY I MOORE FOUNDATION ($15,430,200). 139 of them have funded it in more than one year, and 54% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does PENINSULA OPEN SPACE TRUST have?
- IRS filings report 200 organizations giving $63,464,023 in grants to PENINSULA OPEN SPACE TRUST, 139 of which have funded it in more than one year.
- Who is the largest funder of PENINSULA OPEN SPACE TRUST?
- GORDON E AND BETTY I MOORE FOUNDATION is the largest funder on record, with $15,430,200 in grants. The full list of funders is on this page.
- How can an organization like PENINSULA OPEN SPACE TRUST 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 FY2025 (financials across 2017–2025), and the filings of 200 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 22, 2026. What this page cannot tell you · view filing