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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.

1StartupFox story
2019Founded
CybersecuritySector
Aug 2026Latest coverage

Funding

Horizon3 has raised $429M across 6 disclosed rounds.

$429MRaised
$250MLatest round
6Events
RoundAug 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
Tap any bar to see that round
Not disclosed
Aug 2026Round$250MNightDragon, NEA, Acrew, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, SignalFire Not disclosed
Jun 2025Round$100MNEA, SignalFire, Qualcomm Ventures, Craft Ventures, 9Yards Capital Not disclosed
Aug 2023Round$40MCraft Ventures, SignalFire Not disclosed
Oct 2021Round$30MSignalFire Not disclosed
Feb 2021Round$5MSignalFire Not disclosed
Jan 2020Round$4MSignalFire, 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

SASnehal AntaniCo-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
Round — $4M at Not disclosed, led by SignalFire.
Feb 2021 · funding
Round — $5M at Not disclosed, led by SignalFire.
Oct 2021 · funding
Round — $30M at Not disclosed, led by SignalFire.
Aug 2023 · funding
Round — $40M at Not disclosed, led by Craft Ventures.
Jun 2025 · funding
Round — $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
Round — $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. ↗

The rest of Horizon3's profile is free

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Latest on Horizon3

Funding
Horizon3 Raises $250 Million Series E at Over $2 Billion Valuation Led by NightDragon and NEA
4 AUG 2026 · 5 MIN READ

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Frequently Asked

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 is associated with Snehal Antani, Anthony Pillitiere.

How much funding has Horizon3 raised?

Horizon3 has raised $429M across 6 disclosed rounds. The most recent was a $250M round 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 round 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.