California · Nonprofit
TMT INTERNATIONAL OBSERVATORY LLC
TMT INTERNATIONAL OBSERVATORY LLC (California) receives grants from 1 organization whose IRS filings report $5,000 to it, the largest being MITHUN FAMILY FOUNDATION ($5,000). 1 of them have funded it in more than one year.
Against its field
TMT INTERNATIONAL OBSERVATORY LLC holds deeper cash reserves than three-quarters of the 149 science & tech nonprofits its size.
this organization peer median middle 50% of peers· 149 science & tech nonprofits $10M–$100M, FY2024
Three funders worth looking at
Grantmakers with no record of funding this organization, ranked by how strongly the co-funder graph and the mission embeddings agree. The evidence is in section 03.
- The John C Mithun Foundationshared funders
- Schmidt Ocean Instituteportfolio match
- The Kavli Foundationportfolio match
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.
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: 2023 2% · 2024 33%. Grants only. Government contracts and fees sit inside program revenue.
94% of TMT INTERNATIONAL OBSERVATORY LLC’s revenue is contributions — more reliant on donations than three-quarters of its peers (51% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 8 reported years ran a deficit.
reserve
Who funds it, year by year
2018 → 2023: the base held at 1 funder, grant income held at $1k.
From the IRS filings of TMT INTERNATIONAL OBSERVATORY LLC’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.
Where its funders are
TMT INTERNATIONAL OBSERVATORY LLC draws 100% of its grant income from funders outside California, across 1 state in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. 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.
Funders to approach
Grantmakers that don’t fund you yet, surfaced two ways: they back organizations that share your funders, or their grantees resemble your mission. The ones both signals agree on come first.
- The John C Mithun Foundationshared fundersCA · backs 28 organizations that share your funders
- Schmidt Ocean Instituteportfolio matchits grantees resemble your mission
- The Kavli Foundationportfolio matchits grantees resemble your mission
- The Grass Foundationportfolio matchits grantees resemble your mission
- Revive & Restoreportfolio matchits grantees resemble your mission
- The Shurl and Kay Curci Foundationportfolio matchits grantees resemble your mission
- The Agouron Instituteportfolio matchits grantees resemble your mission
- Seti Instituteportfolio matchits grantees resemble your mission
- Bell Family Foundationportfolio matchits grantees resemble your mission
- Gordon Foundation Bernard M Gordon Et Al Trusteesportfolio matchits grantees resemble your mission
- Center For the Advancement of Science In Space Incportfolio matchits grantees resemble your mission
- The McKnight Endowment Fund for Neuroscienceportfolio matchits grantees resemble your mission
From the co-funder graph (funders backing at least two comparable organizations, shrunk for grantee count, donor-advised and mega-funds excluded) and the universe embeddings. A research starting point; overlap is association, not a guarantee of fit.
Government funding TMT INTERNATIONAL OBSERVATORY LLC receives
Grants and contracts to this organization from federal (USASpending) and state checkbooks, reconciled to its EIN. $13.0M on record.
- National Science Foundation$13.0M
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 TMT INTERNATIONAL OBSERVATORY LLC
Nonprofits whose mission and program text most resemble this one, by semantic similarity over the universe of 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
77% of spending goes to programs.
Governance
Public support
93%
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 TMT INTERNATIONAL OBSERVATORY LLC: 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. How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds TMT INTERNATIONAL OBSERVATORY LLC?
- TMT INTERNATIONAL OBSERVATORY LLC (California) receives grants from 1 organization whose IRS filings report $5,000 to it, the largest being MITHUN FAMILY FOUNDATION ($5,000). 1 of them have funded it in more than one year.
- How many funders does TMT INTERNATIONAL OBSERVATORY LLC have?
- IRS filings report 1 organization giving $5,000 in grants to TMT INTERNATIONAL OBSERVATORY LLC, 1 of which have funded it in more than one year.
- Who is the largest funder of TMT INTERNATIONAL OBSERVATORY LLC?
- MITHUN FAMILY FOUNDATION is the largest funder on record, with $5,000 in grants. The full list of funders is on this page.
- How can an organization like TMT INTERNATIONAL OBSERVATORY LLC 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 FY2024 (financials across 2017–2024), and the filings of 1funders 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 August 27, 2026. What this page cannot tell you · view filing