Business 4 min read By Bethany Hadley
Mach Industries Raises $600M at $3.7B Valuation as 22-Year-Old CEO Targets Production
Mach Industries, the autonomous defence systems company founded by 22-year-old Ethan Thornton, has raised $600 million in a Series C extension at a $3.7 billion valuation, more than doubling its valuation in three months as it shifts from development to production.
Mach Industries, the autonomous defence systems company founded and led by 22-year-old Ethan Thornton, has raised $600 million in a Series C extension at a $3.7 billion valuation. The new funding more than doubles the $1.8 billion valuation the company reached just three months earlier, when it raised an initial $300 million Series C led by Ribbit Capital, Infinite Capital, Bedrock Capital and Sequoia Capital.
The Huntington Beach, California-based company now operates six weapons programmes from a 115,000-square-foot headquarters and manufacturing facility. Its ambitions extend beyond airframes to jet engines, solid rocket motors, energetic systems and autonomous technologies. Thornton launched Mach in 2023 at the age of 19, after developing an interest in defence as a teenager growing up in a military family in Texas.
That interest took root well before he was old enough to drive. Concerned by China's rise and what he described as an impending great power conflict, Thornton was prototyping defence applications on his parents' property by the age of 16, experimenting with hydrogen-powered weapons using materials sourced from Home Depot and Amazon. He later studied aerospace at MIT and worked with the university's federally funded Lincoln Laboratory before receiving a Thiel Fellowship and leaving after his first year to focus on Mach full-time.
Silicon Valley took notice quickly. In June 2023, Sequoia Capital led a $5.7 million funding round in Mach, marking the venture firm's first investment in a hardware defence technology company. Stephanie Zhan, the Sequoia partner who led the deal, described Thornton at the time as «a force of nature», citing his technical depth, obsession with the problem and maturity beyond his years. She added that defence technology is central to safety and security and that Mach represented a step-function advancement for the industry.
By 2024, Mach had secured a deal with the Army Applications Laboratory to develop a vertical-takeoff precision cruise missile. The company's momentum has accelerated since, against the backdrop of a broader boom in defence technology investment. A record $19.8 billion was deployed into the sector in the first quarter of 2026 alone.
Thornton is betting Mach can do more than ride that wave. After several years of developing and testing its technology, the company is now shifting its focus towards production. «For a company like Mach, private capital lets us take risk earlier,» Thornton said. «We can build before there's a massive programme behind something, test it, learn from it and change it quickly.» He added that because Mach thinks about manufacturing from the beginning, it is not designing something and figuring out how to produce it years later. «We're building the product and the production capability at the same time,» he said.
The pace of the company's fundraising has been striking, but Thornton's approach to running a business at 22 is pragmatic rather than precocious. «You're never going to know everything, especially when you're starting young, and you shouldn't expect to,» he said. «If you wait until you have all the answers, you'll probably never start.»
His advice to other young people with ambitious ideas is similarly direct: don't be afraid to fail. «You have to be willing to learn as you go, make mistakes and keep moving,» he said. «Have conviction in the problem you're trying to solve, and then surround yourself with people who can help you solve it.» For Thornton, the lessons from building Mach so young have been less about having all the answers than about knowing who to surround himself with. «Find people who are better than you at the things you don't know, who will challenge you and who believe in what you're trying to build,» he said.
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