Startup profile · funding coverage
Castelion
Hypersonic weapons and defense manufacturing startup in the American Dynamism set.
Stage
series a
Status
private
Coverage
full
Why Castelion is interesting
Castelion represents the hard-tech end of a16z’s American Dynamism thesis — manufacturing speed for hypersonics. Useful contrast to software-defined defense like Anduril.
Key facts
- Series B (Jul 2025): $350M co-led by Altimeter Capital and Lightspeed Venture Partners; a16z, General Catalyst, and Cantos participated (Castelion press)
- Series A (2024): $70M led by Lightspeed with a16z, Cantos participation (Crunchbase News)
- Source: https://www.castelion.com/news/series-b/
Investors in our directory
Funds linked from Castelion's profile — open a fund page for stage focus and related deal articles.
Industries
Defense Tech Space Tech Deep Tech
Industry hub pages are rolling out from our fund-derived baseline taxonomy.
FAQs about Castelion
Funding context and why this company shows up in venture coverage.
Castelion is listed among Andreessen Horowitz (a16z) investments on a16z’s public investment list.
We track a16z-backed companies that are strategically relevant for founders and investors following AI, American Dynamism, crypto, bio, and enterprise software.
Last updated: 2026-07-24