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Airthium (YC S17)

Raising nowOperating

Airthium Inc.

Energy & Cleantech · Bee Cave · Founded 2017

Visit website2,763 followers on WeFunder · as of Oct 9, 2026

100x cheaper battery to stop Climate Change

Raising nowRaising now on WeFunder

This company has an open fundraising round.

$466K raised379 investors204 days left
View the live round
Valuation cap ⓘ
$25.0M
As of Jun 2026 · from Reg CF Offering (2026) · a SAFE/note conversion ceiling, not a priced valuation
Total raised
$3,953,284
Crowd $3.2M · Private $800K · 6 rounds since 2017

Financials

FY2018–FY2025 · from SEC filings · hover any figure for its source
$115K
−$123K
2018
$170K
−$164K
2019
$197K
−$176K
2020
$231K
−$536K
2021
$366K
−$831K
2022
$374K
−$1.2M
2023
$1.2M
−$1.5M
2024
$1.5M
−$1.6M
2025
RevenueNet income — beside revenue when positive, below the line when a loss
Metric
FY2018 reviewed*
FY2019 reviewed*
FY2020 audited
FY2021 audited
FY2022 audited
FY2023 audited
FY2024 audited
FY2025 audited
Income statement
Revenue
$115,090
$169,548
$196,621
$230,796
$365,549
$374,275
$1,232,953
$1,519,556
Cost of goods sold
$0
$0
$0
$0
$0
$0
$0
$0
Gross margin
100%
100%
100%
100%
100%
100%
100%
100%
Net income
-$122,884
-$164,091
-$176,074
-$536,360
-$830,966
-$1,223,955
-$1,452,577
-$1,603,653
Taxes paid
$13,501
$32,704
-$118,908
-$157,945
-$336,103
-$321,933
$0
$0
Balance sheet
Cash
$241,616
$158,683
$315,548
$947,199
$309,071
$3,170,156
$2,130,040
$677,715
Accounts receivable
$0
$0
$0
$0
$0
$0
$0
$21,069
Total assets
$386,144
$259,313
$504,695
$1,220,548
$2,167,296
$5,026,816
$5,426,773
$3,822,557
Short-term debt
$33,169
$74,700
$65,198
$106,131
$296,316
$317,121
$829,839
$934,580
Long-term debt
$491,975
$491,538
$922,496
$2,133,776
$3,820,122
$7,828,024
$9,266,749
$8,941,481
Total liabilities
$525,144
$566,238
$987,694
$2,239,907
$4,116,438
$8,145,145
$10,096,588
$9,876,061
Other
Headcount
—
4
—
11
11
13
—
14

Figures as reported by the issuer in the filing shown on hover. Each year’s pill shows the assurance level of its filed statements — audited, reviewed (CPA review, less than an audit), or unaudited, as the filing’s own report or certification states it. A dashed pill marked * is inferred instead: the SEC minimum for an offering that size, which the issuer may have exceeded. No pill means we couldn’t tell. Headcount is the filing’s point-in-time count, not a year-end average. Manually corrected figures are marked “Corrected”.

Valuation over rounds

Valuation caps on SAFE / convertible note rounds
$17.0M
Valuation cap
$20.0M
Valuation cap
$25.0M
Valuation cap
Reg CF · SAFE · Mar 2021
Reg CF · SAFE · Jul 2022
Reg CF · SAFE · Jun 2026

Dashed amber bars are a SAFE or convertible note's valuation cap — the most it converts at, not what the company is worth.

Cap table

Principal holders% as the filing states it, Jun 11, 2026

  • Andrei Klochko50%+of votes
  • Franck Lahaye20%+of votes

Sold to the crowd

From the company's SEC filings: share counts per class, each class's voting and conversion terms, and the holders of 20% or more that Form C requires (officers and 10%+ holders on Form 1-A). Filings name only large holders, so most owners — including crowd investors — are not listed, and a holder's percentage may be of its own class rather than of the whole company. Prices and crowd share counts are in today's share terms — adjusted for splits and conversions since they were sold. Hover a figure for its filing.

Fundraising history

Raised $465.6K / $1MInvestors 379Valuation cap $25M
Reg CF · SAFE · Jul 2022Closedvia WeFunder
Raised $1.4M / $5MInvestors 1,620Valuation cap $20M
Reg CF · SAFE · Apr 2023Withdrawnvia WeFunder
Raised $0 / $5M
Reg CF · SAFE · Mar 2021Closedvia WeFunder
Raised $1.3M / $1.1MInvestors 1,437Valuation cap $17M
Raised $300KInvestors 3
Raised $500KInvestors 10

Team

3 people
Andrei KlochkoFounder
Co-Founder, CEO & CSO

Creator of the engine at the core of Airthium’s technology. PhD in plasma physics. Mechanical engineering from École Polytechnique. Designed the proprietary compression cycle that no competitor has replicated.

Franck LahayeFounder
Co-Founder, COO

Y Combinator 2017 alum. Former EMEA Sales Director at Intelsat. Ran a satellite capacity brokerage company. Leads strategy and operations from the US.

Houssam Houssein
Multiphysics Simulation Engineer

PhD in applied mathematics, Sorbonne Université. Former engineer at STRUSIM. M2 from École Centrale Paris and Université Paris-Diderot.

Names and titles as disclosed on SEC Form C, WeFunder. Bios and photos come from the platform campaign page and may be out of date.

Reg CF annual-report compliance

Not requiredFiled Form C-TR (terminated reporting)

Filed 2 of 6 annual reports (FY2020–FY2025)

1,620 investors
holder-count proxy

Reg CF issuers must file a Form C-AR each year until a Rule 202(b) termination trigger is met.

  • Form CJun 11, 20260001833928-26-000001
    EDGAR
  • Form C-TRMay 1, 20240001670254-24-000541
    EDGAR
  • Form C-ARMay 1, 20240001670254-24-000540
    EDGAR
  • Form C-TRNov 16, 20230001670254-23-001050
    EDGAR
  • Form C/AApr 28, 20230001670254-23-000461
    EDGAR
  • Form C-WApr 28, 20230001670254-23-000460
    EDGAR
  • Form CApr 28, 20230001670254-23-000459
    EDGAR
  • Form C/ASep 27, 20220001670254-22-000997
    EDGAR
Source: ManualCIK 0001833928

About this data. Figures are compiled from public sources — SEC EDGAR filings (Form C, C-AR, 1-A, 1-K) and funding-platform pages — and may be delayed, incomplete, or restated by the issuer. Financial statements are as reported by the issuer; each year is labeled with its assurance level (audited / reviewed / unaudited). A valuation cap is the conversion ceiling of a SAFE or convertible note, not an agreed company valuation; post-money figures are computed as pre-money plus amount raised and are not a traded price. Crowdonomics is not a broker-dealer, funding portal, or investment adviser; nothing here is investment advice or an offer to sell securities. Verify all figures against the linked EDGAR filings.