Jun 27, 2025

This funding round scales the company's valuation to $1.1 billion, an increase from the $650M valuation achieved three months prior in Onebrief's Series C. “Becoming the newest unicorn in a small group for defense tech is an incredible milestone. This new funding enables us to deepen our investments in wartime resilience, reach, and AI, so our platform can keep pace with the demands of modern conflict.” Share The announcement marks a major milestone for Onebrief. This growth comes at a time when the U.S. Department of Defense (DoD) is accelerating and prioritizing the need for commercial off-the-shelf software to transform and support the warfighter. “Becoming the newest unicorn in a small group for defense tech is an incredible milestone,” said Onebrief CEO Grant Demaree. “This new funding enables us to deepen our investments in wartime resilience, reach, and artificial intelligence (AI), so our platform can keep pace with the demands of modern conflict. Battery Ventures is the ideal partner to help us realize that vision. We're pleased to partner with them, leveraging their experience in defense tech as we progress toward this next phase.” “We were drawn to Onebrief's experienced team and the company's powerful vision,” said Michael Brown, a Battery Ventures general partner. “Onebrief's technology consolidates several key elements of war planning into one platform. It's an intuitive model that has been organically adopted in a viral, bottom-up manner in many corners of the U.S. military, including four of the seven geographic combatant commands and other important units in the critical Indo-Pacific region. We're excited to see Onebrief continue to expand its reach and help the DoD deliver on its stated agenda of operating faster, more efficiently, and cost-effectively.” Onebrief transforms military collaboration from a fragmented, manual process into an integrated, intelligent workspace. Before Onebrief, military staff work was slow, inefficient, and resource-intensive due to legacy tools. Staff would spend weeks or months building tens of thousands of slides. This process would be done without version control or a way to coordinate across commands in real time. Onebrief plans to use the funding to accelerate its engineering and expand its infrastructure to support allied and joint operations worldwide. These advancements will help drive broader utilization and readiness for potential future conflict, with the ability to support 100,000 simultaneous collaborators and remain operational under adversarial conditions. Onebrief also will focus on advancing AI and integration capabilities to enhance decision-making. Users today report 2x efficiency and productivity gains when using the platform. This investment and focus on AI development will help Onebrief scale user productivity by 100x within the next three years. This announcement reinforces Onebrief's leadership in a growing defense tech market, exceeding $140 billion in annual spend. The platform is aligned with the federal government's modernization priorities; military staff optimization has the potential to unlock over $100 billion in savings over the Future Years Defense Program. As one of the fastest-growing defense tech startups in the U.S. – with user hours growing at a 19,600% annualized rate – Onebrief is becoming the platform of choice for planning across the Department of Defense. “Our mission is to make the military staff smaller, smarter, and faster,” Demaree added. “Now, we're one step closer to making that vision a reality.” About Onebrief Onebrief is a transformative cloud-native platform for operational planning and military staff workflows. Currently live on SIPR, NIPR, and JWICS, the software is designed to enable smarter, real-time decisions. With unparalleled collaboration features, AI-enhanced tools, and customizable workflows, Onebrief enables users to double their productivity and make critical decisions in seconds. Learn more at onebrief.com. Contacts Melissa Miller melissa.miller@onebrief.com (c)2025 Business Wire, Inc., All rights reserved.