Founder · Horizon3

Anthony Pillitiere

Co-founder & CTO of Horizon3, a cybersecurity company based in San Francisco.

Co-founder · CTOSan FranciscoCybersecurity
Founded
2019
San Francisco, United States
Raised to date
$428.5M
6 rounds on record
Latest round
Series E
$250M · Aug 2026
Team
201–500

About

Anthony Pillitiere is Co-founder & CTO of Horizon3, a cybersecurity company based in San Francisco, founded in 2019. Horizon3's most recent disclosed round was a Series E of $250M in Aug 2026.

Compiled from StartupFox records · updates as coverage is published

Company

Est. 2019
Horizon3
Cybersecurity · San Francisco · 201–500 people · Active

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
2026-08-03Series E$250MNightDragon, NEA, Acrew, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures, SignalFire
2025-06Series D$100MNEA, SignalFire, Qualcomm Ventures, Craft Ventures, 9Yards Capital
2023-08Series C$40MCraft Ventures, SignalFire
2021-10Series B$30MSignalFire
Company profile →6 rounds on record

Journey with Horizon3

5 milestones
  1. 2019Founded

    Founded by Snehal Antani and Anthony Pillitiere, who met serving at Joint Special Operations Command, to automate repetitive security assessments.

  2. Jun 2025Milestone

    Closes $100 million Series D at a $650 million valuation.

  3. Jun 2026Milestone

    Opens Amsterdam office as EMEA headquarters, with further expansion planned into Australia and Singapore.

  4. Aug 2026Milestone

    Dave DeWalt of NightDragon and Morgan Kyauk join the board of directors as part of the Series E investment.

  5. 3 Aug 2026Milestone

    Raises $250 million Series E at a stated valuation of more than $2 billion, tripling from $650 million in fourteen months.

Also building Horizon3

Snehal AntaniCo-founder · CEO→

Coverage

1 story
Funding · 4 Aug 2026 · 5 min read
Horizon3 Raises $250 Million Series E at Over $2 Billion Valuation Led by NightDragon and NEA

Quick answers

Who is Anthony Pillitiere?

Anthony Pillitiere is a Co-founder & CTO of Horizon3, a cybersecurity company based in San Francisco, founded in 2019.

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 $428.5M across 6 disclosed rounds on record. The latest was a Series E of $250M in Aug 2026, with NightDragon, NEA, Acrew.

Where is Horizon3 based?

Horizon3 is headquartered in San Francisco, United States.

What has StartupFox reported about Anthony Pillitiere?

StartupFox has published 1 story naming Anthony Pillitiere; the most recent is “Horizon3 Raises $250 Million Series E at Over $2 Billion Valuation Led by NightDragon and NEA”.

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Sources & updates

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