Castelion, founded in 2022, raised a $360 million Series B round in July 2025, reaching a $2.8 billion valuation. The company has raised $504 million across Seed, Series A, and Series B funding rounds. Backed by Lightspeed Venture Partners, Altimeter Capital, and SVB, Castelion develops advanced military hypersonic, vehicle, and strike systems. With modern hardware development and manufacturing processes, the company delivers high-performance defense solutions for national security. Castelion is positioned to scale production, expand research and development, and strengthen global defense capabilities.