Funding
Series E · Cybersecurity

Horizon3 raises $250m Series E for autonomous security testing

NightDragon, NEA, Acrew Capital and other investors participated in the August financing.

Updated Oct 16, 2026By RoundOS Funding desk

Horizon3 raised $250 million in Series E financing on August 3. Participants included NightDragon, New Enterprise Associates, Acrew Capital, Blue Cloud Ventures, Demeter Group, EDBI, PSG, SAIC, Sapphire Ventures, Craft Ventures, Prosperity7 Ventures, Qualcomm Ventures, Ridge Ventures and SignalFire.

The company develops autonomous penetration-testing technology for enterprise networks.

Funding history

Series E · This round$250M
UndisclosedUndisclosed

Sources

  1. Horizon3projectstartups.com
  2. businesswire.com

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