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Castelion

Defence · Torrance, United States · Founded 2022

A modern defense production company building the next generation of military hypersonic, vehicle, and strike systems to deter future wars MoreLess

Castelion is a forward-thinking startup focused on enhancing global stability through advanced military technology. The company designs, tests, and manufactures next-generation military systems at a rapid pace and on a large scale. Their mission is to maintain a global technical edge for America and its allies, ensuring peace through deterrence.

Castelion's primary offerings include ultra-high-performance thermal protection systems and avionics, which are essential components of modern military vehicles and aircraft. These systems help protect and enhance the performance of military equipment, making them more effective in various operational scenarios.

The company primarily serves government clients, including the U.S. Department of Defense and allied nations' defense agencies. By providing cutting-edge technology, Castelion helps these clients maintain a strategic advantage in global defense.

Operating in the defense technology market, Castelion's business model revolves around research and development, followed by large-scale manufacturing. They invest heavily in innovation to stay ahead of potential threats and ensure their products meet the highest standards of performance and reliability.

Castelion makes money through government contracts and partnerships with defense agencies. These contracts often involve long-term agreements, providing a steady revenue stream. Additionally, the company may engage in collaborative projects with other defense contractors, further expanding its market reach and financial stability.

In summary, Castelion is a key player in the defense technology sector, dedicated to developing advanced military systems that support global stability and peace through deterrence.

Keywords: military technology, defense systems, thermal protection, avionics, rapid manufacturing, government contracts, defense market, innovation, global stability, deterrence.

Company overview

Castelion company information

The essential company record, classifications and operating signals in one place.

Status
Operational
Founded
2022
Headquarters
Torrance, United States
Employees
174
Open positions
101
Dealroom signal
95.8
client focusb2btechnologyHardwaretechnologyDeep TechsectorDefencebusiness modelManufacturingindustrySecuritysectorMilitarysectorWeaponssectorAviation and AerospacesectorSpace TechsectorRumoured $1BsectorHypersonic FlightsectorSpace UpstreamsectorDual-Use Tech

Valuation & funding

Castelion funding history

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES BOther financing Dec 2025 $350M $1.4B General Catalyst · BlueYard Capital · Lavrock Ventures · First In Capital
DEBTDebt Jan 2025 $30M Silicon Valley Bank
SERIES AOther financing Jan 2025 $70M $280M Andreessen Horowitz · Lavrock Ventures · First In Capital · Lightspeed Venture Partners
EARLY VCOther financing Oct 2023 $14M $57M First In Capital · Andreessen Horowitz · Lavrock Ventures · BlueYard Capital
GRANTOther financing Sep 2023 $1.8M US Department of War · Small Business Innovation Research
GRANTOther financing Sep 2023 US Department of War · Small Business Innovation Research
EARLY VCOther financing Apr 2023 Undisclosed
Showing 7 recorded eventsUnlock the complete deal history →

Growth signals

Castelion website traffic

Latest recorded traffic for Castelion is 25K monthly website visits, up 78.6% over the last three months. Castelion's team grew 30.8% over the past year.

Latest monthly visits25K 3-month web change+78.6% 1-year team growth+30.8%
Monthly website visits34 observations · Oct 2023–Jul 2026
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Comparisons

Castelion compared with similar companies

Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.

Showing 8 of the closest matchesCompare every metric →

Talent graph

Castelion's talent

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Team profiled 10 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 3 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

16 investors on Castelion's cap table

Sourced from Dealroom's funding and investor records. Investor profile links are shown where available.

Seed 2 investors entered at this stage
Series A 13 investors entered at this stage
Andreessen Horowitz
Lavrock Ventures
First In Capital
BlueYard Capital
Champion Hill Ventures
Lightspeed Venture Partners
Interpagos
Cantos Ventures
Interlagos Capital
Altimeter Capital
General Catalyst
Space VC
Avenir
Series B+ 1 investor entered at this stage

Global footprint

Where Castelion has talent and traffic

Workforce by country
🇺🇸 United States · Torrance HQ
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In the news

Latest news about Castelion

Recent press, funding announcements, and product moves mentioning Castelion — open to read from the original sources.

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Market sentiment

What the market is saying about Castelion

An AI-synthesized read of the highest-engagement posts about Castelion on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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