Horizon3
CybersecuritySan Francisco, United States
Horizon3 builds NodeZero, an autonomous penetration testing platform that runs continuous, authorised attacks against customers' live production networks to find and verify exploitable attack paths. Its customers include enterprises, managed service providers and government agencies.
Funding
Horizon3 has raised $429M across 6 disclosed rounds, most recently a Series E in Aug 2026.
$429MRaised
Series ELatest round · Aug 2026
6Events
Series EAug 2026confirmed
$250M
InvestorsNightDragon, NEA, Acrew, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, SignalFire
ValuationNot disclosed
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Not disclosed
Aug 2026Series E$250MNightDragon, NEA, Acrew, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, SignalFire Not disclosed
Jun 2025Series D$100MNEA, SignalFire, Qualcomm Ventures, Craft Ventures, 9Yards Capital Not disclosed
Aug 2023Series C$40MCraft Ventures, SignalFire Not disclosed
Oct 2021Series B$30MSignalFire Not disclosed
Feb 2021Series A$5MSignalFire Not disclosed
Jan 2020Seed$3.5MSignalFire, Ridge Ventures Not disclosed
Investor roster
Every disclosed backer and how often they've written a cheque — repeat names are the strongest conviction signal on the cap table.
New · Latest leadNightDragon1 round · 2026
SignalFire6 rounds · since 2020
Craft Ventures3 rounds · since 2023
NEA2 rounds · since 2025
Qualcomm Ventures2 rounds · since 2025
Ridge Ventures2 rounds · since 2020
Acrew1 round · 2026
Blue Cloud Ventures1 round · 2026
Demeter Group1 round · 2026
EDBI1 round · 2026
Prosperity7 Ventures1 round · 2026
PSG1 round · 2026
SAIC1 round · 2026
Sapphire1 round · 2026
9Yards Capital1 round · 2025
Aggregated automatically from the disclosed rounds above.
Leadership
Snehal Antani Co-founder · CEOAPAnthony PillitiereCo-founder · CTO
MHMatt HartleyChief Revenue Officer
The Horizon3 journey
2019 · founded
Founded by Snehal Antani and Anthony Pillitiere, who met serving at Joint Special Operations Command, to automate repetitive security assessments. ↗
Jan 2020 · funding
Seed — $3.5M at Not disclosed, led by SignalFire.
Feb 2021 · funding
Series A — $5M at Not disclosed, led by SignalFire.
Oct 2021 · funding
Series B — $30M at Not disclosed, led by SignalFire.
Aug 2023 · funding
Series C — $40M at Not disclosed, led by Craft Ventures.
Jun 2025 · funding
Series D — $100M at Not disclosed, led by NEA.
Jun 2025 · milestone
Closes $100 million Series D at a $650 million valuation. ↗
Jun 2026 · milestone
Opens Amsterdam office as EMEA headquarters, with further expansion planned into Australia and Singapore. ↗
Aug 2026 · funding
Series E — $250M at Not disclosed, led by NightDragon.
Aug 2026 · milestone
Dave DeWalt of NightDragon and Morgan Kyauk join the board of directors as part of the Series E investment. ↗
3 Aug 2026 · milestone
Raises $250 million Series E at a stated valuation of more than $2 billion, tripling from $650 million in fourteen months. ↗
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What is Horizon3?
Horizon3 builds NodeZero, an autonomous penetration testing platform that runs continuous, authorised attacks against customers' live production networks to find and verify exploitable attack paths. Its customers include enterprises, managed service providers and government agencies.
Who founded Horizon3?
Horizon3's founders and leadership on record at StartupFox are Snehal Antani and Anthony Pillitiere.
How much funding has Horizon3 raised?
Horizon3 has raised $429M across 6 disclosed rounds. The most recent was a $250M Series E in Aug 2026.
Who are Horizon3's investors?
Disclosed investors in Horizon3 include NightDragon, NEA, Acrew, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures.
What is Horizon3's valuation?
Horizon3 was last reported at Not disclosed, at the time of its Series E in Aug 2026.
What is the latest news on Horizon3?
The most recent StartupFox coverage is “Horizon3 Raises $250 Million Series E at Over $2 Billion Valuation Led by NightDragon and NEA” (4 August 2026). All stories are listed on this page.
Sources & updates
This profile is compiled by the StartupFox desk from company announcements, regulatory and exchange filings (RoC/MCA, NSE/BSE) and our own reporting. 0 of 6 funding rounds link to a named source.
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