What is Castelion developing for the Pentagon?

Castelion is developing and producing hypersonic weapons to enhance the Pentagon's capabilities.

Why did Castelion raise $350 million?

Castelion raised $350 million to accelerate high-volume production of hypersonic weapons and close America's capability gap.

Where will Castelion build its new campus?

Castelion is building a new 1,000-acre campus in New Mexico for next-generation hypersonic systems.

Home / Business and Economy / Ex-SpaceX Team Raises $350M for Hypersonic Missile Production

Ex-SpaceX Team Raises $350M for Hypersonic Missile Production

6 Dec, 2025

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Summary

Castelion secured $350 million in Series B funding for hypersonic weapons.
The startup aims to close America's hypersonic capability gap.
A new 1,000-acre campus in New Mexico will support production.

Ex-SpaceX Team Raises $350M for Hypersonic Missile Production

Defense technology startup Castelion, led by former SpaceX engineers, announced on December 5 that it has raised $350 million in Series B financing. This significant capital infusion is earmarked to accelerate the high-volume production of hypersonic weapons for the Pentagon, addressing a critical U.S. defense need.

The California-based company is vertically integrated in its approach to building hypersonic missiles, a field where U.S. officials acknowledge a strategic lag behind China and Russia. Castelion's initial weapon is being developed for the U.S. Army and Navy. The firm has also secured multiple research and development contracts from the Air Force Research Laboratory, underscoring its strategic importance.