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Defense tech startups claimed the largest US venture check of the week, according to Crunchbase’s August 21 roundup, which tracked deals announced between August 15 and August 21, 2026. Castelion, based in Torrance, California, closed a Series C worth $800 million in equity plus $250 million in debt. JPMorgan Chase, Andreessen Horowitz and Carlyle led the equity portion, setting a $13 billion valuation for the hypersonic strike missile developer.
That single deal says more about capital allocation than about missiles. Money is flowing toward companies building physically hard things with contracted demand behind them. If you are raising in 2026, the comparison set investors carry into your meeting has shifted, and it helps to know what they are measuring you against.
Inside the Castelion Round
The structure matters as much as the headline number. Castelion split its raise between equity and debt, which suggests lenders were comfortable underwriting the company’s order book rather than only its story. Debt is cheaper than equity when revenue is contracted, so founders with predictable customers should ask whether part of their next round belongs on the credit side.
The $13 billion valuation also lands in a week where several other rounds carried billion-dollar marks. Velaura AI, a low-power silicon developer, crossed $1 billion on a $110 million Series A. Rillet, which builds AI-driven ERP tools, hit the same mark with a $100 million Series C led by Iconiq Capital. Both figures came from the same Crunchbase tally.
Where Last Week’s Money Actually Went
Grouping the week’s deals by problem type is more useful than reading them in size order. Three clusters stand out.
Selected US rounds announced August 15 to 21, 2026 (Crunchbase)
Cluster
Company
Amount
Physical and defense systems
Castelion
$800M equity
Physical and defense systems
Muon Space
$250M
Physical and defense systems
Also
$150M
Creative and… Read More
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