Analysis
Six financings of $1 billion or more have closed in just the past 30 days, per Pulse's own funding tracker -- a concentration of mega-checks that would have looked unusual even at the height of 2021's zero-rate boom:
- [Crusoe](/pulse/crusoe-3-9-billion-series-f-close-30-9b-2026) -- $3.9B Series F close (Sept 17), AI-focused cloud and data-center infrastructure.
- Mistral AI -- $3.23B Series D (Sept 8), the French sovereign-AI foundation model lab.
- The Boring Company -- $3B Series D at a $23B valuation (Sept 10), Elon Musk's tunnel-infrastructure company.
- Cognition -- $2B round at a $48B valuation (Sept 8-9), maker of the Devin AI coding agent.
- Instinct -- $1B raise at a $10B valuation (Sept 10), AI security.
- Stoke Space -- $1B Series E (Sept 8), reusable-rocket startup.
Four of the six are AI infrastructure or AI-native products; the other two are pitching a version of the same inevitability story for tunnels and orbit instead of compute. Together they total roughly $14.1 billion in a single month -- nearly a third of the $17.77 billion Pulse has tracked in AI infrastructure funding alone since August 2025 across 37 disclosed deals.
“- Crusoe -- $3.9B Series F close (Sept 17), AI-focused cloud and data-center infrastructure.”
The pace matches what Crunchbase News has been tracking in its own weekly biggest-rounds coverage this month: large, AI-adjacent infrastructure checks dominating the list week after week, with few sub-$500 million rounds cracking the top ten at all.
What the list doesn't show is genuine sector diversification. A fund that claims broad 'AI exposure' this quarter may, in practice, hold positions concentrated in a small handful of names that all raised in the same 30-day window -- diversification by logo count, not by underlying bet.
The test for LPs isn't whether these six checks were individually justified -- each has real revenue, contracted demand, or a working product behind it, unlike large parts of the 2021 vintage. The test is whether a fund's 'AI thesis' actually diverges from this list, or whether writing the thesis down and reading this month's biggest checks produce the same six names.