Onebrief, a startup reshaping operational planning and staff collaboration in the military domain, has announced a $20 million Series C extension round led by Battery Ventures. The raise brings the company’s valuation to $1.1 billion—an extraordinary leap from $650 million just three months ago—cementing its position among a select group of unicorns in the U.S. defense technology sector.
This funding milestone arrives as the Department of Defense (DoD) pushes to integrate more commercial, off-the-shelf software into its operations. At the core of Onebrief’s success is its platform’s ability to streamline and modernize how military staff collaborate. Traditionally, mission planning has relied on slow, siloed, slide-based workflows with little capacity for real-time coordination. Onebrief replaces these outdated methods with a unified, intelligent workspace where collaboration is faster, centralized, and version-controlled—reducing what once took weeks or months into a far more agile and scalable process.
The new capital will be deployed to bolster the platform’s core capabilities, expand engineering, and build infrastructure robust enough to support joint and allied operations worldwide. The company plans to scale the system to support up to 100,000 concurrent users while maintaining operational resilience even under adversarial conditions. A critical part of this investment includes deepening the integration of AI, aiming to enhance decision-making and drive a 100-fold productivity increase over the next three years—up from the current 2x efficiency gains reported by users.
Battery Ventures partner Michael Brown highlighted the platform’s growing adoption within the military: Onebrief is already being used organically across four of the seven geographic combatant commands, including in the strategically sensitive Indo-Pacific region. Its bottom-up adoption—gaining traction through use rather than top-down mandates—has reinforced its credibility as a solution that solves real problems for staff officers under pressure.
Onebrief’s growth reflects broader momentum in the $140 billion defense tech sector, particularly in areas prioritized by U.S. modernization strategies. The company’s tools are aligned with federal goals to streamline operations and reduce waste, with estimates suggesting military staff optimization could yield more than $100 billion in savings over the course of the Future Years Defense Program.
CEO Grant Demaree summed up the company’s vision by stating, “Our mission is to make the military staff smaller, smarter, and faster.” With its latest funding and the backing of a seasoned investor like Battery Ventures, Onebrief is preparing not only to scale but to embed itself as the foundational layer of planning and collaboration in modern warfare.
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