Defense technology startup Mach Industries announced on Thursday that it has secured an additional $600 million in a Series C extension round, pushing its valuation to $3.7 billion. This marks a rapid doubling of the company’s worth in just three months, following an initial Series C announcement in June valued at $1.8 billion.
The investment round includes participation from Ribbit Capital, Infinite Capital, Bedrock Capital, and Sequoia. The current funding represents a significant acceleration in capital growth; the June announcement itself had already quadrupled the valuation from an $100 million round at a $470 million valuation reported in March 2025.
Mach Industries specializes in manufacturing unmanned military systems, including vertical takeoff and landing drones, long-range strike platforms, and counter-drone defenses. The company operates out of a 115,000-square-foot facility in Huntington Beach, California, with additional sites across the state. Its competitive strategy centers on producing highly integrated systems at lower costs than traditional defense contractors.
In May, Mach acquired solid rocket motor (SRM) startup Exquadrum for $50 million in cash and equity, outbidding at least eight other interested parties. The purchase addressed a growing industry bottleneck caused by increased drone usage and limited SRM supply dominated by two major incumbents. The acquisition has since evolved into a new business division, Mach Energetics, which produces SRMs, jet engines, and energetic systems for external clients.
Founded and led by 22-year-old Ethan Thornton, Mach Industries has become a notable example of the defense tech startups attracting substantial venture capital from traditional Silicon Valley firms. Thornton, who left MIT at age 19 to focus on the company, secured early backing from Sequoia’s Stephanie Zhan and Shaun Maguire, marking the firm’s first investment in the defense sector. The company also gained the attention of Ribbit Capital after landing a U.S. Army contract earlier this year, expanding Ribbit’s portfolio beyond its fintech roots into high-profile AI and infrastructure ventures.
The acquisition of Exquadrum makes total sense. Fixing the solid rocket motor bottleneck was a smart move to secure their supply chain.
Wait, they just doubled in three months? That kind of growth rate feels more like crypto than aerospace. Anyone else skeptical about the sustainability?
Sequoia’s first defense sector bet is a massive signal. Are traditional VCs finally waking up to military tech as a viable growth asset?
A 22-year-old running a $3.7B defense firm? That is genuinely wild. The youth in this industry is accelerating fast.