Castelion · Series B

Mass-producing affordable hypersonic weapons for defense

Amount

$350M

Round

Series B

Valuation

—

Announced

Dec 2025

Investors

Lead investor

Altimeter Capital

Participating investors

Andreessen Horowitz

General Catalyst

Lightspeed Venture Partners Lavrock Ventures

Other Castelion rounds

Date	Round	Amount
Aug 2026	Series C	$800M	Details →
Jan 2025	Series A	$70M	Details →