Vanta to acquire Pillar Security to add AI agent security

Vanta, which describes itself as the leading Trust Platform, said on November 9, 2026 that it has signed a definitive agreement to acquire Pillar Security. The deal had not closed at the time of the announcement.

Pillar Security is described as an AI security platform that safeguards agents across their entire lifecycle. Its runtime protection and adversarial testing capabilities are intended to connect the policies that define how AI should operate with guardrails that enforce what agents do.