Diligence memo · auto-generated · as of July 2, 2026
Airthium Inc.
Airthium Inc. has raised $800K over 2 rounds; too few niche peers to rank its valuation yet.
Businessfiled
Airthium Inc. operates in Climate / Cleantech, based in Austin, Île-de-France, France. Decarbonized heat and power cheaper than fossil fuels
Sub-sector tags: Climate, Energy, Energy Storage, Hard Tech, Hardware, climate/cleantech, energy.
Capital & rounds (filed)filed
Airthium Inc. has raised $800K in disclosed capital across 2 recorded rounds, aggregated from public filings. Its latest round is modeled as Pre-Seed (a round under $1.0M).
Largest single filing: $500K on 2017-06-14.
Most recent recorded round closed around 2021-04-30.
Valuation (modeled)modeled
Provath models Airthium Inc. at approximately $6.6M (range $184K–$58M). This is an algorithmic estimate from round sizes and same-niche peers — not a quoted or reported figure.
Too few comparable companies in this niche to rank the valuation fairly yet.
Financing rhythm & timingmixed
Historic cadence: a new round about every 47 months.
Last raise 5.2 yr ago; this sector typically re-raises about every 9 months.
Silent for over 3× the sector's normal cadence.
The last round was 1.7× smaller than the prior — a bridge or down round.
Comparablesmixed
Capital scale ranks ahead of 50% of Climate / Cleantech peers (207 compared).
Modeled value ranks above 53% of those peers.
Closest niche peers: Energy+, Patriot Battery Metals Inc., Climate Every Mountain Ltd Liability Co.
Peoplefiled
2 named people on file across officers, directors and signatories.
Risks & flagsmixed
Financing has been silent well beyond sector cadence — possibly defunct, acquired, or paused.
No clearly named CEO/founder/principal in the surfaced records — key-person evidence is thin.