Home/Companies/Boom Technology vs Castelion

Company pair · Aerospace & Defense

Boom Technology vs Castelion

Aerospace & Defense Both private US-headquartered No Canborsa market

This comparison puts Boom Technology next to Castelion within aerospace-defense on size, funding and trajectory.

On this pageSide by side Valuation marks What each discloses Verdict FAQ

Boom TechnologyPRIVATE · US

CastelionPRIVATE · US

Last valuation$1.5B$2.8B

Basis Post-money Post-money

Founded20142022

Employees≈25≈225

On CanborsaNo marketNo market

Head-to-head · field by field

Boom Technology vs Castelion — side by side

Field

Boom TechnologyPRIVATE · FOUNDED 2014

CastelionPRIVATE · FOUNDED 2022

Last valuation

$1.5B Post-money

$2.8B Post-money

Valuation basis

Post-money

Latest round

Funding Round (same entity as Boom Supersonic)

Series B

Round size

$300M

$350M

Named investors

ARK Invest Bessemer Venture Partners Darsana Capital Partners Robinhood Ventures

Lightspeed Venture Partners Andreessen Horowitz Altimeter Capital

Founded

2014

2022

Employees (est.)

≈25

≈225

Sector & HQ

Aerospace & Defense · US

Aerospace & Defense · 🇺🇸 US

Status & market

Private — no Canborsa market

Valuation · both companies on one scale

Valuation marks

Each bar is the last disclosed mark — $1.5B for Boom Technology (post-money, Dec 2025) and $2.8B for Castelion (post-money).

Boom Technology

$1.5BPost-money · Dec 2025

Castelion

$2.8BPost-money · undated

BOOM TECHNOLOGY · $1.5B · DEC 2025CASTELION · $2.8B · UNDATED

Boom Technology vs Castelion · what each company discloses

What each company discloses, and what it leaves out

Boom TechnologyPRIVATEAerospace & Defense · US · 2014

+Last disclosed mark $1.5B — post-money, Dec 2025.

+Founded 2014 .

+≈25 employees.

+Latest round: Funding Round (same entity as Boom Supersonic), $300M raised, led by Darsana Capital Partners.

CastelionPRIVATEAerospace & Defense · US · 2022

+Last disclosed mark $2.8B — post-money.

+Founded 2022 .

+≈225 employees.

+Latest round: Series B, $350M raised.

Verdict

Verdict

The $1.5B tells you…

What an investor paid for newly issued shares — a primary round, priced post-money.

How much capital arrived with it:$300M, led by Darsana Capital Partners in Dec 2025.

A dated print: it moves only when a newer round is announced.

The $2.8B tells you…

What an investor paid for newly issued shares — a primary round, priced post-money.

How much capital arrived with it:$350M.

A dated print: it moves only when a newer round is announced.

Both marks are post-money, so 1.87× compares like with like. Both are private: there is no public quote and no Canborsa market on either name.

Frequently asked questions

Are Boom Technology and Castelion in the same sector?›

Boom Technology operates in Aerospace & Defense, and Castelion operates in Aerospace & Defense.

How do Boom Technology and Castelion compare in valuation?›

Boom Technology is valued at $1.5B, and Castelion at $2.8B.

How much funding have Boom Technology and Castelion raised?›

Boom Technology has raised $645.1M across 5 rounds, and Castelion has raised $434.2M across 4 rounds.

Who are the lead investors in Boom Technology and Castelion?›

Darsana Capital Partners and Altimeter Capital led the round for Boom Technology; JPMorganChase Strategic Investment Group and Andreessen Horowitz led for Castelion.

Which was founded first, Boom Technology or Castelion?›

Boom Technology was founded in 2014, and Castelion was founded in 2022.