Cybertech company Filigran hailing from Paris has completed a Series C funding round worth €49 million, bringing its total fundraising to over €85 million in just three years since its founding.
This fundraising was led by Eurazeo’s Growth team, part of the leading European investment group Eurazeo, with the support of Deutsche Telekom (T.Capital) and its long-standing investors Accel and Insight Partners.
“This Series C round is an important milestone in Filigran’s journey. We are extremely proud of the collective commitment that brought us here, with one clear mission: enabling organisations everywhere to be more proactive against threats and to leverage intelligence at every level of their security strategy,” said Samuel Hassine, CEO of Filigran. “It reflects everyone’s commitment to achieving our mission, which is to make threat intelligence accessible and actionable for all organisations worldwide.”
Filigran’s Series C positions it among the largest European cybersecurity fundraises of 2025. Within the sector, only Blackwall’s €45 million Series B approaches a similar scale, while most other cyber-focused startups such as Dedge Security and WiseBee secured early-stage rounds in the low-million-euro range.
Alongside these company fundraises, capital is also flowing into specialised investment vehicles such as TIN Capital’s €15 million top-up and Expeditions Fund II’s €100 million close, indicating broader investor confidence in the European cyber ecosystem.
Against this backdrop, Filigran’s open-source-driven approach – centred on OpenCTI, OpenBAS and the forthcoming OpenGRC module – illustrates a more mature phase of growth in a field otherwise dominated by early-stage, proprietary-tool startups.
“We’re thrilled to back Filigran as it enables leading organizations worldwide to take a proactive approach to cyber defense. With AI accelerating both the scale and sophistication of cyberattacks, companies need solutions that can turn vast amounts of threat intelligence into actionable insights to prevent future incidents.
“Filigran’s best-in-class platform delivers exactly that. We’re also excited about the powerful AI capabilities on the horizon, which will further solidify Filigran’s position as the category-defining platform for threat intelligence,” said Raluca Ragab, Partner and Alexandra Pederzani, Director at Eurazeo Growth.
Founded in 2022 by Samuel Hassine and Julien Richard, Filigran seeks to revolutionize proactive cyber threat anticipation with its XTM suite. The XTM suite integrates platforms such as OpenCTI, which helps structure and operationalise global threat intelligence, and OpenBAS, an adversary emulation and security validation solution that leverages real-time threat data to identify security gaps.
Filigran says they stand out in the CyberTech ecosystem for its commitment to revolutionising threat intelligence and its use within cybersecurity teams. Its mission is to develop innovative open source solutions specifically designed to meet the complex challenges organisations face in anticipating cyber risks and threats.
According to the company, their solutions are used by more than 6,000 public and private organisations worldwide, including Rivian, and Bouygues Telecom. Filigran’s users also include public sector organisations such as the European Commission, the FBI, numerous US and Australian federal agencies, and a number of European institutions.
“The progress Sam, Julien, and the Filigran team have made since we led their Series A last year has been remarkable,” said Andrei Brasoveanu, Partner at Accel. “Today, more than 6,000 public and private sector organisations around the world rely on Filigran’s OpenCTI platform to proactively defend against cyber threats. Coupled with a passionate and fast-growing open-source community, Filigran is clearly redefining and democratising access to threat management.”
This new financing aims to support and accelerate Filigran’s growth and expansion into new regions such as the Pacific and the Middle East, with planned expansions into Japan and Saudi Arabia.
Filigran will also strengthen its presence, expanding US and European markets, with plans to onboard new talent from France and Germany to support its growth and strengthen its collaboration with the open-source community, which has doubled in two years.
This new round also supports the development of OpenGRC, a third module for Filigran’s platform, that will complement the eXtended Threat Management suite and enable organisations to prioritise their cyber risks and take the most effective actions first. The company will accelerate its integration of AI with the creation of an AI Agent platform, XTM One, and strengthen its R&D teams at OpenCTI and OpenBAS to drive the continued development of these long-standing solutions.
“Filigran’s expansion across Europe, combined with Deutsche Telekom’s customer base, creates a unique opportunity: delivering advanced cyber defense to organisations of all sizes. Together, we are setting a new benchmark for actionable threat intelligence and resilience,” said Thomas Tschersich, CSO at Deutsche Telekom AG.
EU-Startups has followed Filigran’s trajectory closely over the past two years. We first highlighted the company in early 2024 when they secured a €15 million Series A round to expand its open-source threat intelligence platform. Later that year, Filigran was featured among the “10 European startups driving cybersecurity innovation”, recognising its growing role in the continent’s cyber ecosystem.
Most recently, in mid-2025, EU-Startups again spotlighted the firm in its “Guardians of the grid” list of cybersecurity startups to watch, underlining Filigran’s continued prominence and consistent visibility within Europe’s digital security landscape.
Read the orginal article: https://www.eu-startups.com/2025/10/frances-filigran-nets-e49-million-to-scale-cyber-defence-solutions-used-by-the-fbi-and-european-commission/
