California · Nonprofit
OPEN EARTH FOUNDATION
OPEN EARTH FOUNDATION (California) receives grants from 7 organizations whose IRS filings report $2,493,000 to it, the largest being THE WILLIAM & FLORA HEWLETT FOUNDATION ($1,000,000). 4 of them have funded it in more than one year.
- Revenue FY2025
- $990k
- Funders on record
- 7
- Grants received
- $2.5M
- Net assets
- $2.6M
What Open Earth Foundation does
Mission
The Open Earth Foundation is dedicated to creating and deploying open source digital systems and solutions to mitigate climate challenges and support a thriving planet.
As stated on its FY2025 Form 990.
Programs
Citycatalyst is our flagship open-source platform for city-level climate action, with tools to develop ghg inventories, climate change risk assessments and action planning. This year, it was deployed across over 5,000 cities in latin america, improving data accuracy and accessibility, reducing costs and helping municipalities to identify priority reduction actions. It also launched initiatives to leverage ai for analyzing the city climate action plan across 112 cities in europe.
$1,433,394 spent$211,000 earned by the program90% of program spendingOpenearth lab - as a research and deployment climate tech nonprofit,the openearth lab is where innovation across all projects occurs. The lab supports collaboration among existing projects and is where new innovative ideas emerge that will help openearth foundation move the needle in our mission and develop new programs. This year it focused on new research areas on ai architecture for planetary resilience.
$153,571 spent10% of program spendingOpenclimate is an open source and digitally integratedclimate accounting system designed to help the world achieve theemission reduction targets set by the paris agreement. Its purpose isto remove friction between different standards, reducing doublecounting and catalysing coordination towards climate goals. Wemaintain a public dashboard helping track progress on emission goals.
$3,698 spent0% of program spending
The 3 programs described on its FY2025 Form 990, listed largest first by expense. Program spending in total: $1,590,663.
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. 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 2021 to 2022, from $6.5M to $3.6M (−45%).
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.
73% of OPEN EARTH FOUNDATION’s revenue is contributions — about as donation-reliant as the typical peer (79% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 4 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.
Chief executive
Martin Wainstein
Board chair/executive director
As listed on its FY2025 Form 990.
Who funds it, year by year
2022 → 2023: the base broadened from 4 funders to 6 funders, grant income rose $440k → $1.3M.
2 of 7 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 11% 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 OPEN EARTH FOUNDATION’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
OPEN EARTH FOUNDATION leans on a few funders — its largest provides 40% of grant income and the top three 88%; half comes from just 2 funders.
the vertical line marks half of all grant income — 2 funders to its left
Largest funder’s share by year: 2022 65% · 2023 39% — 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.
Where its funders are
OPEN EARTH FOUNDATION draws 55% of its grant income from funders outside California, across 5 states in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $270k arriving through sponsors registered in 2 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
OPEN EARTH FOUNDATION's funding base is broadening — from 4 funders to 6 as grant income climbed.
this organization peer median middle 50% of peers· 453 science & tech nonprofits $100k–$1M, FY2025
Organizations like OPEN EARTH FOUNDATION
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
86% of spending goes to programs.
Governance
Public support
24%
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 OPEN EARTH FOUNDATION: 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 OPEN EARTH FOUNDATION?
- OPEN EARTH FOUNDATION (California) receives grants from 7 organizations whose IRS filings report $2,493,000 to it, the largest being THE WILLIAM & FLORA HEWLETT FOUNDATION ($1,000,000). 4 of them have funded it in more than one year.
- How many funders does OPEN EARTH FOUNDATION have?
- IRS filings report 7 organizations giving $2,493,000 in grants to OPEN EARTH FOUNDATION, 4 of which have funded it in more than one year.
- Who is the largest funder of OPEN EARTH FOUNDATION?
- THE WILLIAM & FLORA HEWLETT FOUNDATION is the largest funder on record, with $1,000,000 in grants. The full list of funders is on this page.
- How can an organization like OPEN EARTH FOUNDATION 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 2021–2025), 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