Act Security

Act Security is built on the premise that cloud security has focused too long on identifying vulnerabilities without addressing the excessive access permissions that make those vulnerabilities exploitable in the first place. Rather than reporting a finding for a human to patch, Act’s platform places contextual boundaries across a customer’s cloud environment and continuously removes unnecessary access paths as the environment changes — targeting the access sprawl that sits behind most cloud breaches, whether the attacker is human or an AI agent.

Act was founded in 2025 by Jonathan Langer, Itay Kirshenbaum, Stephan Goldberg, and Ilai Fallach — the team behind Medigate, the medical-device cybersecurity company acquired by Claroty for roughly $400 million. The Tel Aviv-based company emerged from stealth in July 2026 with $60 million in total funding: a $20 million seed round led by Team8 and Bessemer Venture Partners, followed by a $40 million Series A led by Notable Capital.

The founding team’s prior successful exit and the scale of funding secured before any public product launch reflect strong investor conviction in the “action-centric” thesis, even though the platform’s real-world impact on breach rates has not yet been independently measured.