Twenty, a defense technology startup that calls itself America's first venture-backed cyber warfare company, has raised a $100 million Series B at a $1 billion valuation, becoming one of the most richly valued offensive-cyber startups in the United States. The round was led by Accel, with participation from Friends & Family Capital, Point72 Ventures and Caffeinated Capital, and brings the Arlington, Virginia company's total funding to $138 million.
Industrializing offensive cyber
Founded in 2024, Twenty builds AI-enabled, end-to-end systems for the U.S. military and Intelligence Community, aiming to give cyber operators the speed and scale needed to deter and defeat adversaries in cyberspace. The company frames its mission as "industrializing" offensive cyber, replacing slow, bespoke tooling with software-defined pipelines that can be produced and deployed at scale. Crucially, Twenty says its systems are designed to keep human judgment at the center, pairing advanced AI and automation with rigorous evaluation, controlled deployment and mission alignment.
A surge of capital into defense AI
The financing lands amid a record year for defense-technology investment, with more than $14 billion flowing into national-security startups in 2026 as venture firms chase the next generation of autonomous and AI-driven systems. Twenty's jump to unicorn status, just months after a $38 million round, reflects how aggressively investors are now backing dual-use AI built explicitly for government missions. The pattern echoes other recent rounds, from Dream's $260M sovereign AI cyber-defense raise to Machina Labs' $124M Series C for defense manufacturing.
Defense meets agentic security
Twenty's rise also tracks a broader shift toward agent-based and runtime security approaches, a theme visible in deals such as Tenet Security's seed round for AI-agent runtime protection. As AI compresses the time between an adversary's action and its impact, both offensive and defensive vendors are racing to embed machine reasoning directly into their platforms. Twenty plans to use the new capital to expand its engineering and research teams and accelerate deployment of AI-driven cyber systems for the U.S. and allied governments.
Reporting based on coverage from PR Newswire, Axios and TechCrunch.