Act Security
Summary active Updated Jul 28, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
Investors
Founders
About
Act Security is a Tel Aviv-based cybersecurity company building an “action-centric” security platform that addresses AI agent access sprawl at the infrastructure layer, focusing on removing unused and excessive access permissions before they can be exploited 123. Founded in 2025 by Jonathan Langer (CEO), Itay Kirshenbaum (CTO), Stephan Goldberg (CPO), and Ilai Fallach (VP R&D) — the same team that founded Medigate in 2017 and sold it to Claroty for $400 million in January 2022 — the company emerged from stealth on 2026-07-28 with $60 million in total funding across a previously undisclosed $20 million seed round and a fresh $40 million Series A 123. The seed round was co-led by Team8 and Bessemer Venture Partners with participation from Hetz Ventures and Caltech; the Series A was led by Notable Capital with participation from Startpoint Capital and SVCI 123.
Disclaimer: This is a lean profile built from initial round coverage and may be expanded as more information becomes available.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-07-28 | Seed | $20M | Team8, Bessemer Venture Partners | Hetz Ventures, Caltech 13 |
| 2026-07-28 | Series A | $40M | Notable Capital | Startpoint Capital, SVCI 123 |
What Investors Say
“Cloud security has spent a decade telling organizations where their risk is. Act is the first platform that actually removes it.”
— Liran Grinberg, Managing Partner, Team8, July 2026 2.
What Founders Say
“They’re inheriting the same old human permissions, running around the clock at machine speed, with none of the judgment a person would apply.”
— Jonathan Langer, CEO & Co-Founder, on AI agents, July 2026 2.
Sources
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“Act Security Raises $60M in Total Funding,” FinSMEs, July 28, 2026. Accessed July 2026. https://www.finsmes.com/2026/07/act-security-raises-60m-in-total-funding.html↩↩↩↩↩
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“Act Security raises $60M to take action against agentic access sprawl at the infrastructure layer,” SiliconANGLE, July 28, 2026. Accessed July 2026. https://siliconangle.com/2026/07/28/act-security-raises-60m-take-action-agentic-access-sprawl-infrastructure-layer/↩↩↩↩↩↩
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“Act Security Emerges from Stealth to Fight the Patch Problem,” SecurityWeek, July 28, 2026. Accessed July 2026. https://www.securityweek.com/act-security-emerges-from-stealth-to-fight-the-patch-problem/↩↩↩↩↩