Vanta to Acquire AI Agent Security Firm Pillar Security

What happened

Founded in 2023 by Ziv Karliner and Dor Sarig, Pillar Security gives companies one platform to discover, test, secure and govern AI agents. After the deal, Pillar's runtime protection and adversarial testing join Vanta's Trust Platform, connecting the policies that define how AI should operate with guardrails that enforce what agents do.

The integration lands in stages through 2027: AI Inventory and runtime monitoring and detection in January 2027, red-teaming in spring 2027, and runtime enforcement in summer 2027. Vanta says the early access program for the AI governance offering it introduced in July 2026 has become its most requested to date, with a waitlist now six times oversubscribed.

Vanta now serves more than 20,000 customers, up from 16,000 in Q1 2026; in April 2026 it announced it had surpassed $300 million in ARR, growing 63% year over year. This is Vanta's third acquisition, following Riskey in July 2025 and Trustpage in January 2023.

Key facts

1. Deal: Vanta announced on Nov 9 it has signed a definitive agreement to acquire Pillar Security
2. Price: Reported at about $150 million in cash and stock; the official announcement did not disclose a price
3. Target: Pillar, founded in 2023, safeguards agents across their entire lifecycle
4. Integration schedule: AI Inventory and runtime monitoring and detection in January 2027, red-teaming in spring 2027, runtime enforcement in summer 2027
5. Vanta scale: More than 20,000 customers, up from 16,000 in Q1 2026
6. Revenue: Announced in April it had surpassed $300 million in ARR, up 63% year over year
7. Acquisition history: Vanta's third acquisition, following Riskey (July 2025) and Trustpage (January 2023)
8. Demand signal: The waitlist for Vanta's July 2026 AI governance early access program is six times oversubscribed