Castelion
Agent39Agent Readiness: 39/100. Below median. Measured by StartupHub.ai. Median 41.Trust75Data Trust: 75/100. Above median. Measured by StartupHub.ai. Median 61.Defense startup mass-producing affordable hypersonic missile systems for the U.S. military, founded by ex-SpaceX engineers.
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.
Listed competitors
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Key facts
- Website
- castelion.com
- Headquarters
- El Segundo, United States
- Founded
- 2022
- Employees
- 100
- Total funding
- $1.1B (Series C)
- Business model
- B2G
Funding rounds
| Date | Round | Amount | Post-money | Lead investors |
|---|---|---|---|---|
| 20 Aug 2026 | Series C | $1.0B | $13.0B | Carlyle, JPMorgan Chase, AH American Dynamism Fund II-B |
| 1 Jun 2022 | Series A | $50M | Lightspeed Venture Partners |
Tech stack
Detected on castelion.com, last scanned 10 Aug 2026. Run your own scan
- Frontend
- jQuery, Bootstrap
- Analytics
- Google Tag Manager
- SEO
- Yoast SEO
- CMS / Builders
- WordPress
- CDN
- Cloudflare
Castelion scores 52. Does yours?
That is its Ahrefs DR: the backlink strength of a domain, on the Ahrefs 0 to 100 scale. Paste your website and you get yours in about a minute.
5 reviews from Reddit gathered in one place
Blackbeard Hypersonic Missile From Startup Castelion Gets Multi-Year Procurement Plan as U.S. Navy's Primary System, 43kg Warhead Raises Questions.
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…
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…
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…
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…
Each quote is copied word for word and links to where it was posted. Promotion and off-topic posts are filtered out.
Frequently asked
Is Castelion trustworthy and reputable?
StartupHub's Data Trust & Reputation score for Castelion is 75 out of 100, a generally safe rating, based on site security posture, privacy practices, malware and phishing checks, and public reputation signals.
How much funding has Castelion raised?
Castelion has raised a total of $1.1B in funding. The most recent round on record is Series C.
How many employees does Castelion have?
Castelion has approximately 100 people on record.
