Castelion raises $350 million in Series B funding to enhance U.S. hypersonic weapon production, led by Altimeter Capital and Lightspeed Venture Partners.
Amount Raised
$350 Million
Round Type
Series B
TorranceManufacturingInformation TechnologyInvestors
Description
Castelion, a defense technology company, announced it raised $350 million in Series B financing to accelerate hypersonic munitions production. The funding supports critical production milestones and the integration of the Blackbeard weapon with U.S. military platforms. Led by Altimeter Capital and Lightspeed Venture Partners, this investment enables expansion and workforce development across the U.S
Quick answer
Castelion raised $350 Million in a Series B round, dated December 5, 2025. Investors: Cantos, First In, General Catalyst, Andreessen Horowitz, Altimeter Capital, Blueyard, Champion Hill and Avenir. Castelion is based in Torrance, California, United States.
- How much did Castelion raise?
- Castelion raised $350 Million in a Series B round on December 5, 2025.
- Who invested in Castelion?
- Cantos, First In, General Catalyst, Andreessen Horowitz, Altimeter Capital, Blueyard, Champion Hill and Avenir are named as investors in this round.
- What does Castelion do?
- Castelion builds American hypersonic deterrence through rapid, affordable, and scalable production of advanced strike weapons.
- Where is Castelion based and how big is it?
- Castelion is based in Torrance, California, United States. Fundz records about 121 employees.
- Who are the decision-makers at Castelion?
- Fundz holds 3 contacts at Castelion, including the Recruiting. Names and contact details are shown to Fundz members.
Source: Fundz verified event record.
Who else raised in Manufacturing around the same time
Companies in the same sectors as Castelion that raised within 45 days of this round, from Fundz verified event records.
- Hadrian raised $131M on December 19, 2025.
- insideFPV raised $655K (Pre-Series A) on January 19, 2026.
- Anzen Industries raised $2.2M (Pre-Seed) on January 19, 2026.
- one.five raised $16M (Series A) on January 19, 2026.
- Noveon Magnetics raised $215M (Series C) on January 19, 2026.
- CoolSem Technologies raised an undisclosed amount (Pre-Seed) on January 19, 2026.
Who to call at Castelion, and when
A new round usually means Castelion is about to hire and buy. The teams that reach out first get the meeting.
- An alert the day Castelion raises, hires an executive or expands, scored against what you sell
- The decision-makers there, with verified emails
- Who you already know at Castelion, from your own LinkedIn network
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Funding Insights
What this usually meansCastelion raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.
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