# Castelion

> Hypersonic weapons and defense manufacturing startup in the American Dynamism set.

## Why it is interesting

Castelion represents the hard-tech end of a16z’s American Dynamism thesis — manufacturing speed for hypersonics. Useful contrast to software-defined defense like Anduril.

## Profile

- **Stage:** series-a
- **Status:** private
- **Industries:** defense-tech, space-tech, deep-tech
- **Coverage:** full
- **Last updated:** 2026-07-24

## Key facts

- Series B (Jul 2025): $350M co-led by Altimeter Capital and Lightspeed Venture Partners; a16z, General Catalyst, and Cantos participated (Castelion press)
- Series A (2024): $70M led by Lightspeed with a16z, Cantos participation (Crunchbase News)
- Source: https://www.castelion.com/news/series-b/

## Investors in our directory

- https://venturecapitaltracker.com/fund/andreessen-horowitz
- https://venturecapitaltracker.com/fund/lightspeed-venture-partners-nyc
- https://venturecapitaltracker.com/fund/altimeter-capital
- https://venturecapitaltracker.com/fund/general-catalyst
- https://venturecapitaltracker.com/fund/cantos

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Source: https://venturecapitaltracker.com/startup/castelion