Castelion

Castelion has raised $1B in total funding. The most recent round was Series C. The last funding was announced in August 2026.

Altimeter, Andreessen Horowitz, Carlyle, General Catalyst, Interlagos, JP MorganChase’s Strategic Investment Group, Lavrock Ventures, Lightspeed Venture Partners, T. Rowe Price Associates, Inc.

Castelion is headquartered in Torrance, CA.

Castelion is a Torrance-based defense startup that mass-produces hypersonic missiles, aiming to shorten development cycles and reduce costs compared to traditional defense programs.

The U.S. needs affordable, rapidly deployable non-nuclear deterrence capability to keep pace with rivals who can out-innovate and out-produce it militarily.

Castelion designs, tests, and manufactures next-generation military hardware, including hypersonic weapons, built for rapid iteration and large-scale production.

They vertically integrate core technologies and design every system for manufacturability from day one, letting them pair speed and rapid test/iteration with affordability at scale rather than treating cost and speed as tradeoffs.

Founded in 2022 by three former SpaceX executives (Bryon Hargis, Sean Pitt and Andrew Kreitz); raised a $1 billion Series C led by Carlyle, JPMorgan Chase and Andreessen Horowitz.