Six-month-old AIR Security raises $50 million to build a firewall for AI agents

Cybersecurity company AIR Security, which develops a security platform for the supply chain of AI agents, has raised $50 million in funding led by Sequoia Capital and Greenoaks.

Swish Ventures and Netz also participated, alongside private investors including Zach Frankel (President, Cognition), Yinon Costica (Co-founder, Wiz), Ofir Ehrlich (Co-founder, Eon), Anne Neuberger, Omer Adam, Varun Anand (Co-founder, Clay); and other senior figures from the cybersecurity and AI industries.

AIR emerged from stealth alongside the funding. The company was founded in February 2026 by Yair Saban and Niv Hoffman, who met about a decade ago in the military. The two have backgrounds in offensive cybersecurity, enterprise infrastructure and AI security research.

The company currently employs 40 people in Israel, with a focus on building a research laboratory dedicated to AI and the behavior of AI agents. Ryan Knisley, the former chief information security officer of The Walt Disney Company and Costco Wholesale, has also joined AIR as chief strategy officer.

The size of the round is notable given how recently the company was founded. AIR is betting that as companies move from experimenting with AI agents to relying on them for increasingly important tasks, a new security layer will be needed to protect the tools, information and instructions those agents encounter.