Nucleus Security, a cybersecurity company specialising in unified vulnerability and exposure management, has secured funding of $20m.
The company has raised $20m in a Series C funding round led by Delta-v Capital. Arthur Ventures also participated in the round, reinforcing backing from existing investors as the business scales to meet growing demand from large enterprises.
Founded to address what it describes as a widening gap between risk data and practical remediation, Nucleus has positioned itself as a system of record for assets, vulnerabilities and exposures. Rather than relying solely on traditional vulnerability scanning, the company has built an exposure management orchestration platform designed to bring together fragmented data and translate it into prioritised, measurable action.
Its technology integrates security and asset information from more than 200 tools, combining that with business context and AI-driven exploit intelligence. The result, according to the firm, is a single, continuously updated view of exposure across IT, cloud, application and operational technology environments. This unified approach is intended to help organisations focus on the vulnerabilities that matter most, rather than being overwhelmed by raw data.
The new funding will be used to accelerate growth as enterprise demand increases. Nucleus says it has been at the forefront of a significant replacement cycle over the past year, with customers moving away from costly, internally developed vulnerability management systems that no longer scale effectively. By offering what it calls a proven and scalable system of record, the company believes it is well placed to capitalise on this shift in 2026 and beyond.
The broader market context has also played in its favour. As exposure management becomes more closely tied to business resilience and board-level oversight, companies are under pressure to demonstrate measurable risk reduction. Nucleus argues that its platform supports that objective by operationalising context and automating remediation workflows, helping teams reduce exposure more quickly in cloud- and AI-driven environments.
Nucleus Security co-founder and CEO Steve Carter said, “This investment reinforces what our customers already know: security teams need speed, clarity, and real outcomes, not more data. We’re helping organizations cut through the noise, prioritize the risks that matter most, and reduce exposure faster in today’s cloud and AI-driven environments.”
Connor Heard, principal at Delta-v Capital, said, “Built by practitioners, the platform has emerged as the orchestration platform organizations need to unify risk across the growing sources of exposure data across IT, cloud, application, and OT environments, without vendor lock-in. Vulnerability and exposure management is increasingly a board-level responsibility; we believe Nucleus is uniquely positioned to define the next phase of this market.”
Ryan Kruizenga, general partner at Arthur Ventures, added, “We invested in Nucleus because the team understood that exposure management is about driving action. Over time, they’ve proven they can execute, building a platform that scales with modern organizations, delivers real operational rigor, and consistently turns complex risk signals into measurable outcomes. Nucleus has evolved from a strong vision into a category-defining company.”
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