Horizon3 Secures $250M Series E, Valuation Tops $2B

Cybersecurity firm Horizon3 announced a $250 million Series E financing that lifts its valuation to more than $2 billion, tripling the figure from a $650 million valuation just 14 months earlier. The round was co‑led by existing backers NightDragon and NEA and included several new investors.

The San Francisco‑based company, which markets the autonomous penetration‑testing platform NodeZero, says the funding will accelerate growth as AI‑driven cyber threats increase. Horizon3 reports that its platform has performed over 310,000 production security tests without disruption, supports continuous scanning of entire infrastructures, and serves more than 7,000 organizations worldwide, including multinational banks, major healthcare networks and four Fortune 10 enterprises. The firm is FedRAMP High authorized and complies with regulations such as DORA, NIS 2, NIST CSF 2.0, HIPAA, SOC 2 and GDPR.