Vanta agrees to acquire AI agent security startup Pillar Security for $150M
On November 9, 2026, Vanta, a security, risk and compliance platform, said it had signed a definitive agreement to buy Pillar Security, an Israeli startup founded in 2023 that builds tools to find, test and control AI agents. CTech (Calcalist) reported the value at about $150 million, split between cash and Vanta shares. A Dealroom note says the terms were not disclosed, so the price rests on Calcalist's reporting. Pillar's software locates agents, subjects them to attack simulations and stops actions they are not permitted to take as they occur.
Pillar's team of more than 20 people will join Vanta and form its research and development center in Israel. Co-founders Ziv Karliner and Dor Sarig will remain to run the AI security business. Pillar has raised about $9 million, including an April 2025 seed round led by Shield Capital. Its customers include Fortune 500, technology and financial firms, according to Dealroom.
Vanta plans to fold Pillar's capabilities into its platform across 2027. Its announcement points to January 2027 as the start, with AI inventory tools and runtime monitoring first, and AI Governance becoming a paid product that month. A Beri analysis places runtime enforcement in summer 2027, and the sources reviewed do not reconcile the two timelines. Vanta, which serves more than 20,000 customers, passed $300 million in annual recurring revenue in April 2026, up 63%. Pillar is its third acquisition, after Trustpage in January 2023 and Riskey in July 2025.
Why it matters
For teams building agents, buyers are starting to ask for proof rather than policy documents. Compliance platforms now sell evidence of what an agent did and which actions were blocked, alongside enforcement. Expect security reviews to request red-teaming results, runtime logs and records of blocked actions. Agent builders that cannot produce those records may find enterprise deals slower to close.
For founders and investors, the reported price signals strong strategic demand for agent security. A company with about 20 staff and roughly $9 million raised reportedly drew about $150 million, but part of that is paid in acquirer stock, so its value moves with Vanta's share price. Standalone agent security startups now have a clearer exit route, though they also face the risk that platform vendors bundle similar features into existing products.
Key points
- 1Vanta signed a definitive agreement to acquire Pillar Security on November 9, 2026.
- 2Calcalist reported the price at about $150 million, split between cash and Vanta shares.
- 3Pillar's roughly 20 employees become Vanta's research and development center in Israel, and founders Karliner and Sarig stay on.
- 4Pillar has raised about $9 million, including an April 2025 seed round led by Shield Capital.
- 5Vanta's AI Governance becomes a paid offering in January 2027, with runtime enforcement timing reported as summer 2027.
