What is Horizon3.ai?
Headquartered in San Francisco, Horizon3.ai operates at the intersection of artificial intelligence and offensive security. The company provides an autonomous penetration testing solution that allows organizations to identify, prioritize, and remediate vulnerabilities from the perspective of a real-world attacker. By eliminating the reliance on manual code reviews or external consultants, the platform offers a proactive security posture that is essential for modern, cloud-native enterprises. The firm's unique approach, developed by former U.S. Special Operations cyber operators, has established it as a critical player in the cybersecurity ecosystem, focusing on the automation of complex security assessments to mitigate emerging digital threats.
How much funding has Horizon3.ai raised?
Horizon3.ai has raised a total of $401.5M across 6 funding rounds:
Angel/Seed
$3.5M
Series A
$5M
Series B
$30M
Series C
$40M
Private Equity
$73M
Series E
$250M
Angel/Seed (2020): $3.5M with participation from SignalFire and Ridge Ventures
Series A (2021): $5M led by SignalFire
Series B (2021): $30M supported by SignalFire
Series C (2023): $40M featuring Craft Ventures and Signal Fire
Private Equity (2025): $73M backed by New Enterprise Associates
Series E (2026): $250M with participation from Ridge Ventures, New Enterprise Associates, PSG, SAIC, Qualcomm Ventures, Craft Ventures, EDBI, Acrew Capital Management, Blue Cloud Ventures, NightDragon, Prosperity7 Ventures, Sapphire Ventures, and SignalFire
Key Investors in Horizon3.ai
SignalFire
A venture capital firm designed as a technology company, utilizing a proprietary AI platform called Beacon AI to provide data-driven support and market intelligence to early-stage teams.
Ridge Ventures
An early-stage venture capital firm that invests in experienced founders transforming the software industry, emphasizing product-market fit and long-term revenue growth.
Craft Ventures
A venture firm founded by former operators that focuses on building B2B technology companies by providing strategic insights and access to senior talent.
What's next for Horizon3.ai?
With this latest round of financing, Horizon3.ai is poised to scale its operations and deepen its technological moat. The company is expected to leverage this capital to expand its market reach, enhance the capabilities of its NodeZero platform, and further integrate AI-driven insights into its security assessment workflows. As the demand for automated, continuous security validation grows, Horizon3.ai is strategically positioned to capture significant market share, transitioning from a high-growth innovator to a foundational pillar of enterprise cybersecurity infrastructure.
See full Horizon3.ai company page
