Castelion raises $1 billion for hypersonic weapons
By The BriefBrief
Hypersonic missile startup Castelion, founded by former SpaceX executives, raised $1 billion. The company says it plans to produce a low-cost hypersonic weapon and expand into longer-range strike and missile defense systems.
WHO:Castelion
WHAT:Raised $1 billion to develop low-cost hypersonic weapons and a broader portfolio of longer-range strike and missile defense systems
WHEN:Reported Aug 19, 2026 at 7:12 PM ET
WHERE:Location not specified
WHY:Cause not yet established.
Reporting from 2 identified publishers across this event arc.
