What is Castelion?
Castelion is a defense technology company headquartered in El Segundo, California, with additional facilities in Texas. The company's core mission is to drastically reduce the cost and time required to bring new long-range strike weapons to market. By employing a strategy of hardware-rich development, vertical integration, and rigorous, high-cadence testing, Castelion aims to revolutionize defense manufacturing. The company is actively testing prototypes and has long-range flight demonstrations planned throughout 2025, positioning itself as a key player in the defense sector's evolution.
How much funding has Castelion raised?
Castelion has raised a total of $464.2M across 3 funding rounds:
Other Financing Round
$14.2M
Series A
$100M
Series B
$350M
Other Financing Round (2023): $14.2M with participation from Andreessen Horowitz, Lavrock Ventures, Champion Hill Ventures, and BlueYard Capital
Series A (2025): $100M led by Andreessen Horowitz, BlueYard Capital, Cantos Ventures, and Lightspeed Venture Partners
Series B (2025): $350M supported by Altimeter Capital and Lightspeed Venture Partners
Key Investors in Castelion
Altimeter Capital
Altimeter Capital is an investment firm that partners with technology companies from early growth through public markets, focusing on concentrated, long-term portfolios and supporting founders in product and strategy.
Lightspeed Venture Partners
Lightspeed Venture Partners is a global multistage venture capital firm investing in early and growth-stage technology companies across enterprise software, consumer, fintech, and infrastructure.
Andreessen Horowitz
Andreessen Horowitz is a prominent American venture capital firm that invests in both early-stage startups and established growth companies, headquartered in Menlo Park, California.
What's next for Castelion?
With a significant infusion of capital and a clear strategic investment, Castelion is poised for accelerated growth and the maturation of its long-range strike weapon prototypes. The company's focus on vertical integration and rapid testing cycles suggests an aggressive timeline for product deployment. This enterprise-level funding indicates confidence from investors in Castelion's ability to execute its ambitious roadmap and capture a significant share of the defense market. Future developments will likely center on scaling production capabilities and securing further contracts, solidifying its position as an innovator in defense technology.
See full Castelion company page
