Defense startup mass-producing affordable hypersonic missile systems for the U.S. military, founded by ex-SpaceX engineers.
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Castelion, founded in 2022 by former SpaceX engineers and headquartered in El Segundo, CA, develops "Blackbeard," an affordable, mass-produced hypersonic weapon system for the U.S. Department of Defense. The company closed a $350M Series B led by Lightspeed Venture Partners and Altimeter Capital in July 2025, bringing total funding to ~$450M. Investors include a16z, Cantos Ventures, and BlueYard Capital.
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Frequently Asked Questions
What does Castelion do?
Castelion, founded in 2022 by former SpaceX engineers and headquartered in El Segundo, CA, develops "Blackbeard," an affordable, mass-produced hypersonic weapon system for the U.S. Department of Defense. The company closed a $350M Series B led by Lightspeed Venture Partners and Altimeter Capital in July 2025, bringing total funding to ~$450M. Investors include a16z, Cantos Ventures, and BlueYard Capital.
How much funding has Castelion raised?
Castelion has raised a total of $450M in funding. The most recent round on record is Series B.
Where is Castelion headquartered?
Castelion is headquartered in El Segundo, United States.
When was Castelion founded?
Castelion was founded in 2022.
What industry does Castelion operate in?
Castelion operates in Defense, Hypersonic, Missiles, Aerospace.
How many employees does Castelion have?
Castelion has approximately 100 people on record.