U.S. startup funding rounds favor defense tech, AI infrastructure

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US startup funding in AI & defense

Highlights

Castelion secures $800 million Series C equity and $250 million debt for its hypersonic missile program, reaching a $13 billion valuation led by JPMorgan Chase, Andreessen Horowitz, and Carlyle.
Etched closes a $700 million round led by Jane Street, valuing the AI inference cluster developer at $21 billion, while Higgsfield and Groq raise $400 million and $350 million, respectively.
Investor interest concentrates on AI infrastructure and defense tech, with significant funding for capital-intensive sectors like data center operations, compute acceleration, aerospace, and enterprise automation.

Largest rounds across defense and AI segments

As reported by Crunchbase News, the week's biggest announced startup financings among U.S.-based companies are led by Castelion, which raises a Series C package of $800 million in equity and $250 million in debt for its hypersonic strike missile program. JPMorgan Chase, Andreessen Horowitz and Carlyle lead the equity portion, giving the Torrance, California-based defense tech company a $13 billion valuation.

Etched follows with a $700 million round led by Jane Street, valuing the San Jose, California-based AI inference cluster developer at $21 billion. Higgsfield secures $400 million in Series B funding at a $5.4 billion valuation for its AI video and image creation platform, while Groq raises $350 million in a new round led by Disruptive, with planned participation from Nvidia, at a $3.5 billion valuation.

Other large financings include Wispr Flow's $280 million Series B round at a $2 billion valuation for its voice-to-text AI tool, Muon Space's $250 million Series C for satellite constellations, and Also's $150 million Series D for electric bikes and small micromobility vehicles. Velaura AI raises $110 million in Series A funding at a valuation above $1 billion, Rillet lands $100 million in Series C at a $1 billion valuation, and Happy Health brings in $75 million for its sleep apnea diagnosis and treatment device.

Investor focus points to infrastructure-heavy demand

The list shows investor appetite remains strongest for businesses building underlying AI computing capacity, defense systems and industrial platforms rather than only consumer-facing software. Several of the largest rounds back compute acceleration, data center operations, silicon, enterprise automation and aerospace manufacturing, indicating continued demand for capital-intensive technology plays.

Some companies also pair fundraising with expansion plans. Muon Space recently opens a manufacturing facility in San Jose designed to produce up to 500 satellites annually by 2027, while Also says part of its new financing will help accelerate development of its autonomous vehicle platform. Crunchbase's methodology tracks the largest announced rounds recorded in its database for U.S.-based companies between Aug. 15 and Aug. 21, noting that some financings can appear with a short reporting delay.

In our earlier article on AI funding moving beyond software into physical and regulated industries, we highlighted a wave of deals backing AI systems used in recycling operations, robotics for GPS-denied environments, medical devices and construction workflows. We noted that this shift reflects growing investor preference for AI tied to equipment and real-world operations, where automation, compliance and efficiency gains can directly impact costs and performance.

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