Author
Samuel Hassine is CEO and co-founder of Filigran, the French cybersecurity company behind OpenCTI, OpenAEV and OpenCRQ. He co-founded it in October 2022 with Julien Richard, now Filigran's CTO.
Under his leadership Filigran has grown fast: the company has raised several significant rounds (a €15M Series A in 2024, a $35M Series B at the end of 2024, then a $58M Series C in 2025, the largest round ever raised by a French cybersecurity company) while keeping the open source DNA of its products and a user community spread across more than 50 countries.
Samuel speaks regularly in the media and at conferences for an approach to cyber intelligence built on Continuous Threat Exposure Management (CTEM), and for the conviction that open source accelerates rather than hinders the adoption of robust cybersecurity by organisations.
Articles by Samuel Hassine
Fueling our next chapter: Filigran raises $58M in Series C
Filigran secures $35M Series B to drive global expansion and fuel product innovation
Bringing life to Filigran eXtended Threat Management platform with OpenAEV first releases
Combining Sekoia.io Threat Intelligence and OpenCTI
Filigran raises €15M in Series A funding, set to expand to the United States and Australia
Imposing consequences on cyber adversaries
Introducing threat intelligence automation and playbooks in OpenCTI
OpenCTI case management is ready for takeoff: what is available and what’s next
Filigran Series Seed: €5 Million to build the next-generation open source eXtended Threat Management ecosystem
Progressive rollout of the OpenCTI Enterprise Edition: why, what and how?
How OpenCTI helps to fight disinformation and foreign interferences
New OCTI dashboards: the first graph dashboarding engine for the STIX model
