/Companies

Valthos

New York, US · Founded 2024 · Delaware corporation · 14 employees on LinkedIn · 4 known investors

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Valthos develops AI systems to identify biological threats and design medical countermeasures in real time for biodefense applications.

Founders & leadership

KMKathleen McMahon
Kathleen McMahonCo-Founder & CEO
TV
Tess van StekelenburgFounder

Board

TVTess Van Stekelenburg
Tess Van StekelenburgCo-Founder & PresidentPartner at Lux Capital

Investors · 4

Also in the syndicate · 1

OpenAI

Reported raises · per SEC filings

Form D private placements

$27.3M disclosed across 1 round · 2025

▶$27.3MraisedApr 2026 · 5 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Tess Van StekelenburgDirector
  • Kathleen McMahonExecutive Officer, Director
Offering amount
$27.5M
Amount sold
$27.3M
First sale
Aug 2025
Incorporated
Corporation, Delaware, 2024
Federal exemptions
06b
Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

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In the news

Frequently asked questions

What does Valthos do?
Valthos develops AI systems to identify biological threats and design medical countermeasures in real time for biodefense applications.
Who are Valthos's investors?
Valthos's investors include Lux Capital, Founders Fund, OpenAI Startup Fund.
How much funding has Valthos raised?
Valthos has disclosed $27.3M raised across 1 round.
Where is Valthos headquartered?
Valthos is headquartered in New York, US.