Act Security has closed a swift Series A funding round just four months after completing a $20 million seed raise, highlighting the continued momentum of Israeli cybersecurity startups. Since its launch, the company has now secured a total of $60 million in funding.
Notably, Act Security raised $40 million in its Series A round only months after its seed financing, underscoring strong investor confidence in the company’s early execution and market opportunity. The startup is developing a platform to secure cloud infrastructure and data centers and currently employs a team of 30 professionals.
The latest funding round was led by US-based Notable Capital. In addition, Startpoint, the investment arm of Clal Insurance’s Claltech Capital, participated alongside existing investors that led the seed round. These returning backers include Bessemer Venture Partners, Team8, Hetz Ventures, and Brightmind.
The company completed its seed round in August. Since then, Act Security has moved quickly to scale its technology and operations, prompting the rapid follow-on investment.
Act Security was founded by an experienced leadership team comprising Jonathan Langer (Chief Executive Officer), Itay Kirshenbaum (Chief Technology Officer), Stephen Goldberg (Chief Product Officer), and Ilai Fallach (Chief Research and Development Officer). Previously, Langer and Kirshenbaum co-founded Medigate in 2017, a medical device security and management company, with Goldberg joining as one of its earliest employees.
In 2021, Claroty acquired Medigate for approximately $400 million, providing the founding team with a strong track record in building and scaling cybersecurity platforms. Consequently, Act Security’s rapid fundraising reflects both the founders’ prior success and sustained investor appetite for cloud and data center security solutions.











