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Castelion

A venture-backed defense tech company building mass-producible hypersonic weapons systems using modern hardware development and manufacturing processes.

Defense TechSeries B$464M raised

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Frequently Asked Questions about Castelion

What does Castelion do?

A venture-backed defense tech company building mass-producible hypersonic weapons systems using modern hardware development and manufacturing processes.

How many employees does Castelion have?

Castelion has 120 employees as of 2026.

How much funding has Castelion raised?

Castelion has raised $464M in total funding. Their most recent round was a Series B.

What technologies does Castelion use?

Castelion works with technologies including Defense Tech, Aerospace, Manufacturing, Robotics, Infrastructure.

More About Castelion

Company Info

San Francisco, CA

Founded 2022

120 employees

$464M total raised

Technologies

Defense TechAerospaceManufacturingRoboticsInfrastructureAIAutomationEnterprise