California · Nonprofit
ONE EARTH PHILANTHROPY
ONE EARTH PHILANTHROPY (California) receives grants from 38 organizations whose IRS filings report $13,858,422 to it, the largest being HOPPER-DEAN FOUNDATION ($3,544,353). 21 of them have funded it in more than one year.
- Revenue FY2025
- $9.6M
- Funders on record
- 38
- Grants received
- $14M
- Net assets
- $6.3M
What One Earth Philanthropy does
Mission
One Earth connects thinkers, doers, activists, and knowledge holders from around the world to solve humanity's greatest ecological challenges--together. Our belief is simple: The solutions to the climate crisis already exist. By connecting people, resources, and ideas, we can unlock humanity's full problem-solving potential to build a just and thriving future for all.
As stated on its FY2025 Form 990.
Programs
Guided by a comprehensive Solutions Framework, a roadmap of 75+ proven pathways across Energy Transition, Nature Conservation, and Regenerative Agriculture, we turn knowledge into impact. By connecting local solutions to global systems, we support coordinated, place-based action through a suite of tools, a robust grantmaking strategy, and storytelling platforms that inform, guide, and inspire change. Our core insight is that solving the climate crisis requires shifting both culture and capital. Narratives shape priorities, and priorities shape where resources flow. To scale the solutions our planet needs, we must change both the story people tell about climate action and the systems that determine where investment goes. To do this, One Earth has built a set of interconnected tools that answer three foundational questions: what to invest in, where it matters most, and how capital needs to shift to support them. WHAT TO INVEST IN: The One Earth Solutions Framework identifies more than 75 science-based pathways across Energy Transition, Nature Conservation and Regenerative Agriculture that are required to stabilize the climate and protect biodiversity. WHERE IT MATTERS MOST: The…
$5,318,227 spentof which $4,002,206 as grants$26,099 earned by the program100% of program spendingOther program services, not described on the e-filed return.
$0 spent0% of program spending
The 2 programs described on its FY2025 Form 990, listed largest first by expense. Program spending in total: $5,318,227.
The organization over time
Each line starts at 100 in 2020, so what you read is the shape rather than the size: 150 means half as much again as 2020, 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 2020 to 2021, from $10k to $3.7M (+37224%).
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.
100% of ONE EARTH PHILANTHROPY’s revenue is contributions — more reliant on donations than three-quarters of its peers (88% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 6 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
Brad Leibov
Board Chair
As listed on its FY2025 Form 990.
Who funds it, year by year
2021 → 2023: the base broadened from 9 funders to 20 funders, grant income rose $1.1M → $4.2M.
15 of 38 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 33% 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 ONE EARTH PHILANTHROPY’s funders (the co-funder graph). Top 30 of 38 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
ONE EARTH PHILANTHROPY has a broad base — no single funder exceeds 26% 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
36% 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 ONE EARTH PHILANTHROPY.
Largest funder’s share by year: 2021 44% · 2022 40% · 2023 48% — 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
58% of ONE EARTH PHILANTHROPY's grant income comes from California funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $4.6M arriving through sponsors registered in 9 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
ONE EARTH PHILANTHROPY runs a healthier operating margin than three-quarters of the 1,209 environment nonprofits its size.
this organization peer median middle 50% of peers· 1,209 environment nonprofits $1M–$10M, FY2025
Organizations like ONE EARTH PHILANTHROPY
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
89% of spending goes to programs.
Governance
Public support
79%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 30 states
Screen this organization
A dated, signed PDF of the compliance screen for ONE EARTH PHILANTHROPY: 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 ONE EARTH PHILANTHROPY?
- ONE EARTH PHILANTHROPY (California) receives grants from 38 organizations whose IRS filings report $13,858,422 to it, the largest being HOPPER-DEAN FOUNDATION ($3,544,353). 21 of them have funded it in more than one year.
- How many funders does ONE EARTH PHILANTHROPY have?
- IRS filings report 38 organizations giving $13,858,422 in grants to ONE EARTH PHILANTHROPY, 21 of which have funded it in more than one year.
- Who is the largest funder of ONE EARTH PHILANTHROPY?
- HOPPER-DEAN FOUNDATION is the largest funder on record, with $3,544,353 in grants. The full list of funders is on this page.
- How can an organization like ONE EARTH PHILANTHROPY 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 2020–2025), and the filings of 38 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