Filigran Raises $35 Million in Series B to Enhance OpenCTI and Broaden Cybersecurity Offerings

Filigran, a Paris-based cybersecurity startup, has made headlines by raising $35 million in a Series B funding round, just months after securing $16 million in Series A funding. This latest investment, led by Insight Partners with contributions from existing investors Accel and Moonfire, marks a significant milestone for the company as it aims to solidify its position in the competitive and rapidly evolving cybersecurity landscape.

Filigran’s Flagship Product: OpenCTI

At the core of Filigran’s growth strategy is its flagship product, OpenCTI, an open-source threat intelligence platform designed to centralize, manage, and enrich cybersecurity threat data from various sources. OpenCTI empowers organizations—ranging from private enterprises to public sector entities—to import threat data from multiple channels and augment that data with insights from top-tier providers such as CrowdStrike, SentinelOne, and Sekoia. This capability enables users to compile comprehensive threat intelligence and maintain a robust defense against ever-evolving cyber threats.

The platform’s open-source model has attracted an extensive and active community, with over 4,300 cybersecurity professionals contributing to its ongoing development. OpenCTI has been downloaded millions of times, reflecting its popularity and widespread use. Notable users include the European Commission, the FBI, and the New York City Cyber Command, underscoring OpenCTI’s global reach and effectiveness across diverse sectors.

In addition to its open-source model, Filigran offers an enterprise version of OpenCTI, available as either a Software-as-a-Service (SaaS) solution or for on-premises deployment. This enterprise edition is utilized by major global organizations, including Airbus, Marriott, Thales, Hermès, Rivian, and Bouygues Telecom, further establishing OpenCTI’s value for high-profile clients requiring robust threat intelligence capabilities.

Building a Comprehensive Cybersecurity Suite: The XTM Vision

Filigran’s successful foundation with OpenCTI has paved the way for additional product offerings and a broader vision: the eXtended Threat Management (XTM) suite. The XTM suite aims to provide organizations with a full spectrum of cybersecurity tools that address various aspects of threat detection, simulation, and management.

An integral part of this vision is OpenBAS, Filigran’s second flagship product. OpenBAS is a breach and attack simulation platform that enables organizations to evaluate their security defenses by simulating potential cyberattack scenarios. By integrating OpenCTI and OpenBAS, Filigran offers users a comprehensive view of potential vulnerabilities, allowing them to assess their risk exposure and fortify their defenses accordingly.

While OpenCTI and OpenBAS can function independently, Filigran believes that using them together enhances organizations’ understanding of their cybersecurity posture. This integration exemplifies the XTM suite’s mission: to deliver end-to-end cybersecurity solutions that respond to the complexities of modern cyber threats. CEO Samuel Hassine notes that the company is already working on a third product to further strengthen the XTM suite, aiming to offer a comprehensive suite of three complementary products by 2026.

Fostering Community Collaboration with the XTM Hub

To augment its product offerings, Filigran is developing a collaborative space for cybersecurity professionals, inspired by successful community-driven platforms like GitHub and Hugging Face. The planned XTM Hub will serve as a central forum where users can access resources, share best practices, and connect with others in the cybersecurity space. Filigran envisions the XTM Hub as a valuable resource, not only for sharing tradecraft but also for strengthening the ecosystem around its products and reinforcing a culture of collaboration within the cybersecurity community.

As the cybersecurity industry faces increasingly complex and frequent attacks, collaborative platforms like the XTM Hub could prove invaluable. Hassine emphasizes the Hub’s role in empowering the cybersecurity community by fostering knowledge sharing and innovation, helping members stay at the forefront of threat detection and management. “The Hub will serve as a central forum where users can access resources, share tradecraft, and connect with others in the Filigran ecosystem,” Hassine added. The platform is expected to launch by the end of the year, aligning with Filigran’s goal of building a connected and well-informed cybersecurity community.

Strategic Expansion and International Growth

A significant portion of the $35 million Series B funding will support Filigran’s expansion into new regions, part of its strategy to increase its global footprint and meet the growing demand for cybersecurity solutions. Currently, the company operates in France, the United States, and Australia. With the latest investment, Filigran plans to extend its reach to key international markets, including Germany, Japan, and Singapore.

These regions represent important opportunities for growth. In Germany, there is a strong demand for cybersecurity solutions due to the country’s large industrial sector and the rapid digitalization of its economy. Japan, another key market, has been emphasizing cybersecurity measures in preparation for global events like the 2025 Osaka Expo and increasing regulatory focus on data protection. Singapore, often seen as the cybersecurity hub of Southeast Asia, presents a gateway to further expansion in Asia.

Investors Bet Big on Filigran’s Potential

Leading the Series B round is Insight Partners, a New York-based venture capital firm known for investing in high-growth software and technology companies. The participation of Insight Partners, along with returning investors Accel and Moonfire, signals confidence in Filigran’s potential and strategic direction. With this additional funding, Filigran is well-positioned to accelerate product development, strengthen its XTM suite, and establish itself as a prominent player in global cybersecurity.

Future Outlook: Innovating for a Safer Cyber Landscape

The rapid growth of Filigran speaks to the company’s ability to identify and address critical needs within the cybersecurity landscape. By expanding its XTM suite, Filigran aims to offer organizations a robust, interconnected system of cybersecurity tools that provide comprehensive threat management solutions.

The planned XTM Hub is a noteworthy initiative, as it not only reinforces Filigran’s product lineup but also demonstrates the company’s commitment to community and collaboration. By creating a space where cybersecurity professionals can connect and share insights, Filigran fosters an environment of continuous learning and innovation. In an industry where threats are always evolving, the collaborative aspect could be a vital factor in ensuring that users remain one step ahead of cyber attackers.

Filigran’s approach—combining popular open-source solutions with enterprise-level offerings—positions it uniquely in the cybersecurity market. By providing free and accessible tools alongside a robust paid suite, Filigran meets the needs of a wide audience, from individual cybersecurity experts to large-scale enterprises.

With the backing of Insight Partners, Accel, and Moonfire, Filigran is scaling its operations, expanding its product suite, and preparing to enter new international markets. OpenCTI and OpenBAS have already proven successful, establishing a strong foundation for Filigran’s comprehensive XTM suite and community-oriented XTM Hub. As the company continues to innovate and expand, it is poised to make a significant impact on the cybersecurity landscape, helping organizations stay secure in an increasingly digital world.