Defense tech startup Onebrief has raised another $200 million and acquired a small battle simulation company, Axios reported. The deals follow on the heels of a record-setting year for venture investment into defense tech startups, per Crunchbase data.
Battery Ventures and Sapphire Ventures led the Series D funding for Honolulu-based Onebrief. Investors including Salesforce Ventures 1, General Catalyst and Insight Partners joined. An updated valuation was not reported, but the company raised its Series C just seven months ago at a $1.1 billion pre-money valuation, per Crunchbase.
Onebrief has now raised $311 million in total, per Crunchbase data. Along with the funding, the company acquired Battle Road Digital, a startup that makes simulation and wargaming software for the military and raised a $5 million seed round in 2023.
The company’s AI-driven collaborative and planning software is used by the U.S. Department of Defense to design, coordinate and brief complex military operations more efficiently, functions previously done on paper, through email and hand-written notes.
“Staffs are too slow. They’re just too slow for how fast our adversaries move now; they’re too slow for how complex the modern battlefield is. We need things to move hundreds of times faster than they do, and that takes automation,” Onebrief CEO Grant Demaree, a former Army officer, told Axios.
With conflicts brewing around the world, venture investment in defense tech startups has soared in recent years, Crunchbase data shows. Funding to VC-backed startups in defense — defined by us as the industries of military, national security and law enforcement — hit $7.7 billion across close to 100 deals in 2025, per Crunchbase data. That was a record high for investment in the space and more than double 2024’s tally.
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