Twenty (twenty.io), an Arlington-based developer of autonomous offensive cyber warfare systems, has raised $100 million in Series B funding led by Accel. The company builds intelligent agentic platforms that automate reconnaissance, exploitation, and multi-stage attacks at industrial scale for U.S. military and intelligence customers. The capital will accelerate platform development and operational deployments.
Defense Tech Funding Signals Category Validation
The round follows Twenty’s $38 million Series A in late 2025 and brings total funding to $138 million at a $1 billion valuation. It arrives as policymakers debate expanding private-sector roles in cyber operations, with CEO Joe Lin recently testifying before Congress on the need for industrialized capabilities.
Legacy Cyber Tools Constrain Scale
Current offensive cyber operations remain largely manual and bespoke, limiting the number of targets operators can handle simultaneously. Twenty’s platform encodes operator tradecraft into software agents that run continuous operations across hundreds of targets, addressing the gap between adversary industrialization and U.S. force capacity.
Agentic Systems Encode Operator Tradecraft
Twenty’s end-to-end platform automates the full offensive lifecycle rather than bolting AI onto existing workflows. Leadership with deep experience from USCYBERCOM, NSA, and Expanse gives the system credibility with cleared operators who require tools that match real mission constraints.
"Twenty is the only venture-backed offensive cyber warfare company, and we've reached operational deployment at a pace rarely seen in defense tech."
Accel Validates Offensive Cyber Thesis
Accel led the round, joined by existing investors including Friends & Family Capital and Point72 Ventures. The participation of a top-tier growth investor alongside prior defense backers such as In-Q-Tel signals conviction that software-defined offensive capabilities represent a durable category.
Policy Access Accelerates Adoption
Twenty’s founders have testified before both House and Senate committees within months, and the CEO shared stages with the White House National Cyber Director. These engagements position the company to influence doctrine while scaling engineering hubs in New York and forward-deployed roles at Fort Meade and other cyber commands.
Talent Pipeline Matches Mission Tempo
With dozens of active clearances-required roles and a new partnership with Marshall University, Twenty is building the bench needed for sustained operational support. The company has already moved from stealth to deployed capability in under two years.