Where is Castelion headquartered?

Castelion is headquartered in El Segundo, CA and was founded in 2022.

How much funding has Castelion raised?

Castelion has raised $464M in disclosed funding, at a most recent valuation of $2.8B (Series B, Dec 2025).

What does Castelion specialize in?

Castelion works across Hypersonic weapons, Solid rocket motors, Defense manufacturing.

Does Castelion hold government contracts?

Defense Tech Atlas links Castelion to 4 government contracts.

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CompanyVerified

Castelion

Hypersonic long-range strike weapons manufacturer for deterrence and defense.

Castelion develops mass-producible hypersonic long-range strike weapons using vertical integration, hardware-rich development, and high-cadence testing. Founded by former SpaceX executives, the company builds solid rocket motors, low-cost missile avionics, and thermal protection materials in-house at its El Segundo, CA headquarters and its Project Ranger manufacturing campus in Rio Rancho, NM. Castelion holds active US Navy and Army contracts for its Blackbeard hypersonic strike weapon and the HIMARS-compatible Blackbeard GL variant, and signed a production framework agreement with the Department of War guaranteeing a minimum of 500 Blackbeard missiles per year once testing concludes.

Overview

Headquarters: El Segundo, CA
Founded: 2022
Employees: 89
Total funding: $464M
Valuation: $2.8B (Series B, Dec 2025)
Stage: Series B
Status: active
Domains: Hypersonic weapons, Solid rocket motors, Defense manufacturing
LinkedIn: www.linkedin.com/company/castelion
X / Twitter: x.com/Castelion
Website: castelion.com

Founders3

Investors2

Cap table8

Approximate ownership by holder. Indexed holders link to their records.

Raised per round

Valuation over time

Valuation: $2.8BRaised: $350M

Percentages marked ~ are not disclosed. Some are a generic VC-pattern model (founders/team weighted heaviest, option pool lightest, other holders evenly) sized to whatever's left undisclosed — a standard industry shape, not this company's actual cap table.

Holder	Instrument	Ownership
Founders & early team	Common	~21.9%
Lightspeed Venture PartnersReinvested	Preferred (Series B)	~14.6%
Andreessen HorowitzReinvested	Preferred (Series B)	~14.6%
Other investors	Preferred	~14.6%
Lavrock VenturesReinvested	Preferred (Series B)	~14.6%
Employee option pool	Options	~7.3%
Silicon Valley Bank / venture debtNew	Debt	~6.3%
Altimeter CapitalNew	Preferred (Series B)	~6.3%

Contracts4

Programs0

No linked records yet.

Frequently asked

What does Castelion do?: Castelion develops mass-producible hypersonic long-range strike weapons using vertical integration, hardware-rich development, and high-cadence testing. Founded by former SpaceX executives, the company builds solid rocket motors, low-cost missile avionics, and thermal protection materials in-house at its El Segundo, CA headquarters and its Project Ranger manufacturing campus in Rio Rancho, NM. Castelion holds active US Navy and Army contracts for its Blackbeard hypersonic strike weapon and the HIMARS-compatible Blackbeard GL variant, and signed a production framework agreement with the Department of War guaranteeing a minimum of 500 Blackbeard missiles per year once testing concludes.
Where is Castelion headquartered?: Castelion is headquartered in El Segundo, CA and was founded in 2022.
How much funding has Castelion raised?: Castelion has raised $464M in disclosed funding, at a most recent valuation of $2.8B (Series B, Dec 2025).
What does Castelion specialize in?: Castelion works across Hypersonic weapons, Solid rocket motors, Defense manufacturing.
Does Castelion hold government contracts?: Defense Tech Atlas links Castelion to 4 government contracts.

Sources & citations5

Each claim links to its underlying source. Confidence reflects how directly the source supports the claim.

1
Founded 2022 by Bryon Hargis, Sean Pitt, Andrew Kreitz (ex-SpaceX); HQ El Segundo, CA
BusinessWire: Castelion Announces $100M Financing
Verified2025-01-29
2
Raised $350M Series B led by Lightspeed and Altimeter in July 2025; total $464M
TechCrunch: Castelion is raising a $350M Series B to scale hypersonic missile business
Reported2025-07-03
3
Castelion and Department of War sign framework agreement guaranteeing a minimum of 500 Blackbeard missiles per year, supporting the Arsenal of Freedom initiative
Castelion: Castelion and Department of War Sign Agreement
Verified2026-05-13
4
Castelion's Project Ranger: over $250M in private-capital investment for a 1,000-acre manufacturing campus in Rio Rancho, New Mexico
Castelion: Castelion Announces Project Ranger
Reported2026-08-16
5
Castelion and Saronic Technologies to pair Saronic's Marauder medium unmanned surface vessel with Blackbeard hypersonic capability, targeting a first-of-its-kind maritime hypersonic launch demonstration in 2027
Breaking Defense: Saronic, Castelion to pair Marauder MUSV with Blackbeard hypersonic capability
Verified2026-06-11