AI Security Funding Surge Exposes Cracks in Old Cybersecurity Model
AI threats are straining human-led cybersecurity as Index Ventures backs younger startups and Google’s $32 billion Wiz deal resets market stakes worldwide.
Summary
Cybersecurity stocks are rising and investors are pouring substantial capital into AI-native security startups as concern grows over AI safety and rogue agents. Instinct and Simile have secured nine-figure checks and valuations that would have seemed implausible several years ago, signaling a sharp repricing of young security companies.
On September 23, 2026, Index Ventures partner Shardul Shah argued that periodic, human-in-the-loop security can no longer keep pace. Shah has invested in cybersecurity and enterprise software for nearly two decades, including six consecutive rounds in cloud-security startup Wiz before Google acquired it for $32 billion earlier in 2026, one of Google’s largest acquisitions. Index is now backing AI-native security companies at stages that previously required much more proof, although exact funding terms and technical details for Instinct and Simile remain limited.
Positives
- Google’s $32 billion Wiz acquisition became one of the company’s largest deals after Index Ventures backed the cloud-security startup across six consecutive rounds.
- Instinct and Simile secured nine-figure checks and valuations as investors pursued security products designed for an AI-native world.
- Cybersecurity stocks are rising as concern about AI safety and rogue agents increases demand for new defenses.
- Index Ventures continues funding AI-native security companies at stages that historically required substantially more evidence.
Risks & concerns
- AI-safety and rogue-agent concerns are exposing weaknesses in security processes built around periodic human intervention.
- Periodic, human-in-the-loop security can no longer keep pace, according to Index Ventures partner Shardul Shah.
- Index Ventures is investing before companies reach the level of proof previously expected, increasing uncertainty around younger businesses.
- Exact funding terms and technical details for Instinct and Simile remain unspecified despite their nine-figure checks and valuations.