Castelion

El Segundo, CA · Founded 2022 · Privately Held (backing)

Manufacturer of advanced hypersonic weapon systems designed to strengthen conventional deterrence through rapid, scalable production. Castelion is based in El Segundo, CA and was founded in 2022. It was valued at $2.8 billion at its early-stage round in Dec 2025, the last priced event on record. It has raised $464 million across 3 recorded rounds; the latest was a $360 million later-stage round in Aug 2025.

PMV mark · valuation
$2.8B
Oct 2026
Priced at
its early-stage round
Dec 2025
Total raised
$464.1M
Last round
Later Stage VC
Aug 2025

Who backs Castelion?

26 investors
InvestorType
Andreessen HorowitzVenture capital
General CatalystVenture capital
Lightspeed Venture PartnersVenture capital
Quiet Capital—
Avenir Growth CapitalGrowth equity
7percent VenturesVenture capital
IPO CLUBVenture capital
Altimeter Capital ManagementVenture capital
BlueYard CapitalVenture capital
Datapower VenturesVenture capital
+ 16 more investors · a free account shows the complete list
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Castelion investors

26 investors are on record for Castelion, including Andreessen Horowitz, General Catalyst, Lightspeed Venture Partners and Quiet Capital. By type, the record holds 16 venture capital firms and 1 growth equity firm. The later-stage round in Aug 2025 drew 30 investors.

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