Defense Unicorns, the US startup that builds environments for defence and other industries to build and use open source and other software in cloud and air-gapped environments, has raised $136 million in a Series B round. The investment pushes its valuation past the $1 billion mark, finally making its boldly named ambition official.
The round was led by Bain Capital’s Tech Opportunities Fund, with participation from existing investors Ansa Capital, Sapphire Ventures, Valor Equity Partners, AVP, Uncorrelated Ventures, and retired US Army general and former CIA director David H. Petraeus. The funding cements Defense Unicorns’ position among a small but growing club of venture-backed defence technology firms that have crossed the unicorn threshold.
Founded in 2021 and headquartered in San Antonio, Texas, the company builds open source, air-gap-native software designed to get modern code into the kinds of disconnected, contested environments where militaries actually operate. Its tooling is used across multiple branches of the US Department of Defense, including the Navy, Army, Air Force, and Space Force, to deliver updates to mission systems that have historically lagged far behind commercial software.
Defense Unicorns and competitors like Second Front are building next-generation software platforms for organisations that have traditionally been slow to adopt more modern computing due to security risks. That , logic has started to hit a wall in the worlds of military and defence, however, due to the rapidly evolving demands of warfare and the tools that adversaries are developing.
Announcing the raise, co-founder and CEO Rob Slaughter pitched the company’s technology as a strategic necessity rather than a nice-to-have.
“Defense Unicorns gives our nation a wartime software advantage,” Slaughter said. “The US has significant commercial software advantages, but the systems we go to war with are typically outdated. At Defense Unicorns, we make software a strategic deterrent by making it easy to deploy and operate software in any mission environment.”
The new capital will be used to expand the firm’s core platforms, including its so-called flagship Unicorn Delivery Service (UDS), a secure and portable system for shipping software into classified or disconnected networks.
The company is also scaling its UDS Registry and UDS Army offerings, which are designed to standardise secure DevSecOps pipelines across Army programmes and reduce the friction involved in fielding new digital capabilities.
From the investor side, Bain Capital partner Dewey Awad framed the deal as a bet on software’s growing role in military readiness.
“Defense Unicorns plays a vital role in helping the military modernise mission systems, enabling capabilities that directly improve readiness, resilience, and operational advantage in the field,” he said.
Defence Unicorns’ entry into the billion-dollar club comes amid a broader surge in VCl interest in defence tech startups.
In Europe this week, Paris-based Harmattan AI also achieved unicorn status, raising $200 million at a $1.4 billion valuation in a Series B round led by Dassault Aviation. The French company develops autonomous drones and AI-enabled mission systems and has already attracted strategic backing from national defence ministries.
With fresh funding and expanded backing, Defence Unicorns is poised to deepen its footprint across mission domains where secure, scalable software delivery can deliver real field advantage.
