Horizon3
Runs autonomous AI-driven penetration testing to secure enterprise networks
$250MSeries E
Role not disclosedSV
Sapphire Ventures
Activity from announced rounds
Activity in this selectionOct 15, 2026 · Cybersecurity · Jul 18, 2026
Sapphire Ventures invests in enterprise software and AI companies after product-market fit, focusing on expansion-stage businesses building toward category leadership.
The firm concentrates on a selected group of companies and works on scaling go-to-market, operations and leadership. Its platform includes executive talent introductions and connections to prospective customers and partners.
This model addresses the transition from a working product to an organisation capable of sustained enterprise growth: recruiting leadership, expanding distribution and building the operating capability around a larger customer base.
Sources
- Rounds participated in
- 1
- Confirmed lead rounds
- — 1 roles undisclosed
- New companies
- 1 First participation on record · 0 follow-on
- Funding in participating rounds
- $250M 1 disclosed · full round size, not this investor’s share