Castelion joined the Unicorn Club on July 03, 2025 after raising a $360 million Series B funding round, reaching a $2.8 billion valuation. Headquartered in El Segundo, California, United States, Castelion specializes in building advanced military hypersonic, vehicle, and strike systems for national security and future war deterrence.
The company applies modern hardware development and manufacturing processes to produce cutting-edge defense technology and ensure scalable, high-performance military solutions.
Keep reading to learn how Castelion scaled into a leading defense technology unicorn.
What Is Castelion and What Does It Do?
Founded in 2022, Castelion is a modern defense contractor focused on developing advanced military systems, including hypersonic vehicles, strike technologies, and next-generation defense hardware.
The company integrates state-of-the-art hardware development, testing, and manufacturing processes to provide high-performance systems for national security applications. Castelion’s platforms are designed to enhance defense capabilities, operational readiness, and strategic deterrence.
How Much Funding Has Castelion Raised?
1. Seed Round
- Amount Raised: $72 million
- Date: 2022
- Lead Investors: Early stage defense and technology investors
- Purpose: Build core defense technologies, hardware prototypes, and initial operations
2. Series A Round
- Amount Raised: $72 million
- Date: 2023
- Lead Investors: SVB, Altimeter Capital
- Purpose: Expand R&D, develop prototype systems, and grow engineering team
3. Series B Round
- Amount Raised: $360 million
- Date: July 2025
- Valuation: $2.8 billion
- Lead Investors: Lightspeed Venture Partners, Altimeter Capital
- Purpose: Scale production, enhance advanced hypersonic and vehicle systems, and accelerate deployment
Total Funding Raised: $504 million Latest Funding Date: July 2025 Latest Known Valuation: $2.8 billion
Key Investors
- Lightspeed Venture Partners
- Details: Venture capital firm investing in high growth technology companies
- Focus Areas: Frontier technology, defense innovation, and hardware platforms
- Altimeter Capital
- Details: Growth-focused investment firm backing technology and defense companies
- Focus Areas: Advanced hardware, defense systems, and scalable technology platforms
- SVB
- Details: Global banking and venture capital partner supporting technology and defense startups
- Focus Areas: Early stage innovation, hardware development, and high growth companies
Where Is Castelion’s Headquarters?
Castelion is headquartered in El Segundo, California, United States, supporting its defense R&D, engineering, and production operations.
What’s Next for Castelion?
Castelion plans to scale its advanced military system production, develop next-generation hypersonic and strike technologies, and expand operational readiness solutions for national security. The company aims to strengthen its engineering and manufacturing capabilities while delivering cutting-edge defense solutions globally.
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