Defense Tech and AI Infrastructure Dominate Latest U.S. Venture Capital Megadeals

Defense and Inference Chips Grab the Lion's Share

That single deal dwarfs most full-quarter totals in defense tech — and it set the tone for a week where U.S. venture capital poured billions into infrastructure plays, AI tooling, and national-security hardware.

The Week's Heavy Hitters

Crunchbase's weekly megadeals board tells the story in cold numbers. Etched, a four-year-old inference-chip startup out of San Jose, pulled in $700 million at a $21 billion valuation — led by Jane Street, no less, a firm better known for quantitative trading than semiconductor bets. Higgsfield, the AI video-creation platform, closed a $400 million Series B at $5.4 billion with DST Global anchoring a syndicate of at least 18 investors. Groq, which operates 13 data centers globally, added $350 million at a $3.5 billion valuation, led by Disruptive with Nvidia joining the table — this on the heels of a $650 million round just two months prior.

Further down the stack, Wispr Flow secured $280 million at a $2 billion valuation for its voice-to-text tool. Muon Space, designing satellite constellations, raised $250 million in Series C capital led by Eclipse and is ramping a San Jose factory targeting 500 units a year by 2027. Velaura AI, focused on ultra-low-power silicon for AI compute, crossed the billion-dollar mark with a $110 million Series A led by Seligman Ventures. Even Rillet, building agentic ERP software, hit $100 million in Series C funding led by Iconiq Capital.

Capital Flows Reveal the Thesis

The pattern is unmistakable. Investors are pricing in two converging bets: that AI inference demand will keep compounding, and that the U.S. defense industrial base is overdue for a venture-scale overhaul. Etched's $21 billion valuation on a company barely out of its infancy signals that the market expects inference hardware margins to rival those of the hyperscalers themselves. Castelion's $13 billion mark on a pre-revenue missile program tells you how much geopolitical risk premium LPs are willing to underwrite.

Meanwhile, the infrastructure-tech dominance across recent funding rounds extends beyond chips and weapons. Groq's back-to-back raises — $650 million in June, $350 million now — suggest data-center capacity is still the bottleneck everyone wants to own. Nvidia's reported interest in Mercor, an AI startup helping develop open-source models, adds another layer: the GPU giant is quietly building an equity moat around the ecosystem that consumes its silicon.

The sobering reality check: these valuations assume sustained demand growth and a capital-markets window that stays open. Defense contracts move slowly. Inference margins compress as competition scales. And a $21 billion price tag on a four-year-old chip company leaves zero room for execution stumbles. The money is flowing — but the multiples already price in perfection.