Castelion

CastelionCastelion
Castelion

Castelion

Defense startup mass-producing affordable hypersonic missile systems for the U.S. military, founded by ex-SpaceX engineers.

DR 422022Active100El Segundo, United States
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About

Castelion designs, tests, and manufactures next-generation military systems at massive scale to deter future wars. They build hardware optimized for cost, manufacturability, and rapid deployment, focusing on affordable hypersonic weapons. Castelion serves national security needs by preserving peace through credible, non-nuclear deterrence.
HEADCOUNT
100
DOMAIN RATING
42
Comments
(6)
1 positive2 mixed3 negative
Reddit
r/UkraineWarRoomu/DefenseExpressApr 26, 2026Mixed

Blackbeard Hypersonic Missile From Startup Castelion Gets Multi-Year Procurement Plan as U.S. Navy's Primary System, 43kg Warhead Raises Questions.

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Reddit
r/LessCredibleDefenceu/UpTheRiffMateApr 25, 2026Mixed

Hypersonic weapon startup Castelion wins $105 million Navy contract for F/A-18 integration. Is the US Navy jumping the gun in pursuing carrier based hypersonics while there's still no tried and true defences against land based, antiship hyp…

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Reddit
r/FighterJetsu/Vegetable_Captain886Apr 25, 2026Positive💎

Hypersonic weapon startup Castelion wins $105 million Navy contract for F/A-18 integration. Castelion, a small California defense startup, has won a $105 million U.S. Navy contract to ready ‌its Blackbeard hypersonic missile for use aboard…

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Reddit
r/RioRanchou/Background_Drive_156Dec 13, 2025Negative

The Project: Castelion plans to build a hypersonic missile assembly plant just 2.8 miles from our community, Northern Meadows. The Core Issue: While the company has stated they will not be launching missiles from this site, the facility wil…

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Reddit
r/Albuquerqueu/Background_Drive_156Dec 12, 2025Negative

The job numbers. It started at 1,000 employees. Now recently, it is down to 300 employees. Guess by when? 5 years after start up which means they won't reach the 300 level for another six years. You know how many jobs they plan to have at t…

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Reddit
r/RioRanchou/Background_Drive_156Dec 12, 2025Negative

The job numbers. It started at 1,000 employees. Now recently, it is down to 300 employees. Guess by when? 5 years after start up which means they won't reach the 300 level for another six years. You know how many jobs they plan to have at t…

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Frequently asked

What does Castelion do?

Castelion designs, tests, and manufactures next-generation military systems at massive scale to deter future wars. They build hardware optimized for cost, manufacturability, and rapid deployment, focusing on affordable hypersonic weapons. Castelion serves national security needs by preserving peace through credible, non-nuclear deterrence.

How much funding has Castelion raised?

Castelion has raised a total of $50M in funding. The most recent round on record is Series A.

Where is Castelion headquartered?

Castelion is headquartered in El Segundo, United States.

When was Castelion founded?

Castelion was founded in 2022.

What industry does Castelion operate in?

Castelion operates in Defense, Hypersonic, Missiles, Aerospace, Defense Tech, Hypersonic Weapons.

How many employees does Castelion have?

Castelion has approximately 100 people on record.

What is Castelion's revenue?

StartupHub estimates Castelion's annual revenue at $55.2M (range $41.1M to $76.1M, 66% confidence), based on comparable companies in the sector.

What is Castelion's valuation?

StartupHub estimates Castelion's effective valuation at $193.2M (range $125.0M to $300.0M, 10% confidence), based on comparable companies in the sector.