Horizon3.ai
Makes NodeZero, an autonomous penetration testing platform that attacks networks the way adversaries do, used by enterprises, federal agencies and national defense organizations.
Tactical operations center during Saber Junction 19, Hohenfels, Germany. Photo: U.S. Army JMRC photo by Spc. Hayden Allega, Public domain (PD-USGov-Military-Army).
Funding history
| Date | Round | Amount |
|---|---|---|
| Aug 2026 | Series E | $250M |
Why it matters
NodeZero Federal holds FedRAMP High authorization; more than 3,000 organizations use the platform.
Is Horizon3.ai publicly traded?
Horizon3.ai is privately held as of November 14, 2026: there is no ticker and no announced IPO. Shares are not available on public exchanges.
Information only, not investment advice.
Some figures rest on a single report. Treat them as indicative.Last verified November 14, 2026
Horizon3.ai: key questions
What does Horizon3.ai do?
Makes NodeZero, an autonomous penetration testing platform that attacks networks the way adversaries do, used by enterprises, federal agencies and national defense organizations.
What does Horizon3.ai make?
Products named by Horizon3.ai include NodeZero.
Where is Horizon3.ai based?
Horizon3.ai is headquartered in San Francisco, California. It was founded in 2019.
What is Horizon3.ai's valuation?
Horizon3.ai was valued at $2B+ as of Aug 2026, after a $250M Series E (Aug 2026).
How much funding has Horizon3.ai raised?
Total funding is ~$428.5M, based on announced and reported rounds. Latest round: Series E, $250M, Aug 2026.
Who are Horizon3.ai's investors?
Notable investors include NEA, NightDragon, SignalFire, Craft Ventures, 9Yards Capital.
Is Horizon3.ai publicly traded?
Horizon3.ai is privately held as of November 14, 2026: there is no ticker and no announced IPO. Shares are not available on public exchanges.
Can you buy Horizon3.ai stock?
Not on a public exchange: Horizon3.ai is a private company. Shares of private companies change hands only in private transactions open to accredited investors, when the company allows it. This is not investment advice.
Sources
- securityweek.com/horizon3-ai-raises-100-million-in-series-d-funding/
- runtimewire.com/es/article/horizon3-raises-250-million-series-e-autonomous-cybersecurity
Figures come from company announcements, government sources and press reports. Spot an error? Send a correction. Nothing here is investment advice.
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