Funding Round · Pentagon · Wall Street · Nvidia · Crunchbase News
The Week’s 10 Biggest Funding Rounds: Defense Tech, AI Tools And Infrastructure Lead The Way
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This is a weekly feature that runs down the week’s top 10 announced funding rounds in the U.S. Check out last week’s biggest funding deal roundup here.
Key facts
- Wispr Flow, $280M, voice-to-text AI: Wispr Flow, a provider of an AI-powered voice-to-text tool called Flow, picked up $280 million in Series B funding at a $2 billion valuation
- Higgsfield, $400M, AI video tools: AI video- and image-creation platform Higgsfield closed on $400 million in Series B financing at a $5.4 billion valuation
- Muon Space, $250M, satellites: Muon Space, a designer, builder and operator of satellite constellations, closed on $250 million in Series C funding led by Eclipse
- Happy Health, $75M, sleep testing: Happy Health, and Austin-based developer of a ring device for diagnosis and treatment of sleep apnea, raised $75 million from Arch Venture Partners and OpenLoop
Summary
Want to keep track of the largest startup funding deals in 2026 with their curated list of $100 million-plus venture deals to U.S.-based companies? Startup investors were busily closing on big rounds this week, with AI and defense among their favored target sectors. Castelion, $800M, defense tech: Castelion, a defense tech startup developing a hypersonic strike missile, raised new Series C funding consisting of $800 million in equity capital along with $250 million in debt financing. Etched, $700M, semiconductors: San Jose, California-based Etched, a developer of inference clusters to accelerate AI computing, secured $700 million in a new funding round led by Jane Street and joined by a long list of prominent investors.