Vanta has signed a definitive agreement to acquire Pillar Security, an Israeli start-up that secures AI applications and agents at runtime, the US company said on 9 November 2026. Israeli business daily Calcalist reported the price at about US$150m in cash and shares.
Why Vanta is buying Pillar Security
Vanta said that legacy compliance systems were built to check risk at human speed and cannot govern autonomous AI agents. Combining Pillar's runtime protection and adversarial testing with Vanta's Trust Graph would let the platform block unauthorised agent actions and generate audit trails.
“An agent can cross a line in a single action, long after its last review.”
Deal terms and financing
The companies did not disclose financial terms. Calcalist said Pillar's more than 20 employees will join Vanta and that the founders will lead its AI security business, with Pillar becoming Vanta's Israeli R&D centre.
Market context
Pillar was founded in 2023 and raised a US$9m seed round led by Shield Capital in April 2025. Vanta plans to roll out Pillar-based AI inventory and runtime monitoring in January 2027, red-teaming in spring 2027 and runtime enforcement in summer 2027.
