Castellion, founded in 2022, builds military systems designed to scale the manufacturing of advanced strike technologies. The company has raised more than $460 million in total funding, including a $350 million Series B that gave it a $2.8 billion valuation. Backed by a16z and Lightspeed Venture Partners, Castellion focuses on high volume production, rapid deployment, and next generation defense capabilities. Headquartered in Austin, Texas, the company is rapidly expanding its manufacturing systems to meet increasing global defense demand.