Castelion
formerly CastellionPeace Through Deterrence
El Segundo, United States · Founded 2022 · $1.9B raised
- Headquarters
- El Segundo, California
- Employees
- 51–200
- Founded
- 2022
- Business Model
- B2G
- Website
- castelion.com
- Total Funding
- $1.9B
- Last Round
- $1.0B Series CAug 2026
- Rounds
- 6
About
Castelion designs and manufactures affordable hypersonic strike weapons for the US military, combining rapid iteration, vertical integration, and scalable manufacturing inspired by the WWII and Apollo engineering eras. Founded by former SpaceX executives, the company focuses on restoring America's conventional deterrence capabilities through credible, non-nuclear long-range strike systems. The company raised $350M in a December 2025 Series B and secured a $49.9M Navy contract in early 2026.
Summary
Castelion is an Aerospace company based in El Segundo, United States, founded in 2022. It has raised $1.9B in total across 6 rounds, most recently a $1.0B Series C round in Aug 2026. Investors include Lightspeed VP, Altimeter Capital and Andreessen Horowitz.
Tech & App Stack
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Funding History
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Aug 2026
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Seed through Series C — per-round amounts, valuations, and who invested in each round.
Investors
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