# Castelion

**Source:** https://geo.sig.ai/brands/castelion  
**Vertical:** Defense  
**Subcategory:** Hypersonic Missiles  
**Tier:** Emerging  
**Website:** castelion.com  
**Last Updated:** 2026-04-14

## Summary

Raised $350M Series B (Dec 2025). $50M US Navy contract for Blackbeard hypersonic prototyping. 1,000-acre solid rocket motor facility under construction.

## Company Overview

Castelion is a defense startup developing the Blackbeard hypersonic missile system, one of the few startups with an active US Navy contract for hypersonic weapons full-scale prototyping and early operational fielding. The company raised $350 million in Series B financing in December 2025 and secured a $50 million US Navy contract for Blackbeard prototyping, directly addressing the DoD's urgency to field hypersonic strike capability as China and Russia have demonstrated operational hypersonic weapons.

The company is constructing a 1,000-acre solid rocket motor manufacturing facility — Project Ranger — targeting the industrial-scale production capability needed to field hypersonic weapons in meaningful numbers rather than demonstration quantities. This vertical integration of propulsion manufacturing signals ambitions beyond initial prototyping toward a genuine weapons production enterprise.

The US hypersonic program has been plagued by repeated test failures and schedule slippage, creating strong demand for commercial alternatives with faster development timelines and more flexible contracting. Castelion's startup structure allows it to move faster than traditional defense primes on hardware development, while the Navy contract provides the customer validation needed to attract institutional capital for the capital-intensive production scale-up ahead.

## Frequently Asked Questions

### What does Castelion do?
Develops the Blackbeard hypersonic missile system — one of the only startups with a US Navy contract for hypersonic prototyping and early operational fielding.

### How much has Castelion raised?
$350M Series B in December 2025, plus a $50M US Navy contract for Blackbeard hypersonic prototyping.

### What is Project Ranger?
Castelion's 1,000-acre solid rocket motor manufacturing facility under construction in 2026 — targeting industrial-scale hypersonic propulsion production.

### Why does the US need commercial hypersonic programs?
US government hypersonic programs have repeatedly failed tests and slipped schedules while China and Russia field operational weapons — creating urgency for faster commercial alternatives.

### What is Castelion?
Castelion is a defense technology company developing hypersonic weapons and missile systems for the US military, applying commercial aerospace manufacturing techniques to produce precision strike capabilities at lower cost and higher production rates than traditional defense contractors.

### How much has Castelion raised?
Castelion has raised approximately $100M from investors including Founders Fund and 8VC, founded by veterans of SpaceX and other aerospace companies applying commercial manufacturing approaches to defense weapons.

### What is the hypersonic weapons market?
Hypersonic weapons (Mach 5+) are a national security priority for the US DOD as Russia and China have deployed hypersonic capabilities. The US has accelerated hypersonic development programs across multiple services, creating a multi-billion dollar acquisition opportunity.

### What is Castelion's manufacturing approach?
Castelion applies rapid iteration, commercial-off-the-shelf components, and advanced manufacturing techniques from commercial aerospace to produce hypersonic missile systems faster and cheaper than traditional defense prime contractors using cost-plus contracting.

## Tags

hardware, manufacturing, b2b

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*