Sarasota cybersecurity firm raises $20M, plans to scale

A Sarasota-based cybersecurity firm recently closed its Series C funding round, securing $20 million. The latest capital raise for Nucleus Security was led by venture capital firm Delta-v Capita, headquartered in Denver,.

Nucleus Security specializes in exposure management. It integrates data from more than 200 tools into a shared, up-to-date view of exposure to drive “prioritized action and measurable risk reduction” across organizations, according to a statement.

Founded in 2019 by former Department of Defense security experts, the company now has more than 400 clients in the public and private sectors. Current users include companies like MasterCard, Motorola and Paychex, according to its website. 

"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,” Connor Heard, principal at Delta-v Capital, says in a statement. “Vulnerability and exposure management is increasingly a board-level responsibility; we believe Nucleus is uniquely positioned to define the next phase of this market.”

With the funding, Nucleus plans to scale to meet what it calls surging demand for its services.

The $20 million capital raise is a “milestone … not a finish line,” Nucleus Security CEO and co-founder Steve Carter says in the statement. “This investment lets us scale alongside [clients]. It allows us to deepen the intelligence and automation required to operate in cloud- and AI-driven environments. And it gives us the ability to invest in the long-term resilience of the platform without losing focus on outcomes.”

Nucleus Security — which is headquartered at 71 Alafia Drive off Fruitville Road east of Interstate 75 — is among the nation’s fastest-growing companies in terms of revenue, according to Inc. The magazine ranked Nucleus Security No. 770 on the Inc. 5000 list in 2025, due to the company’s 545% revenue growth over the last three years.

In the last year, Nucleus Security reports it has seen growth specifically as enterprise customers replace “expensive, homegrown vulnerability management tools” with the scalable system of record that the Sarasota company provides.

"We invested in Nucleus because the team understood that exposure management is about driving action," Ryan Kruizeng, general partner at Minneapolis-based Arthur Ventures, says in a statement. "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."