# Fluidstack secures $1.5 billion Series funding

> Fluidstack has secured $1.5 billion in new funding, led by Jane Street Capital, at an $18 billion valuation. The company provides AI inference infrastructure, the compute layer that actually runs trained models when users send them requests, as opposed to the separate and often larger job of training those models in the first place. The lead investor is worth noting. Jane Street is a quantitative trading firm, not a traditional venture backer, and its appetite for a compute provider signals how mainstream financial players now view AI infrastructure as a core asset class rather than a speculative tech bet. As deployed AI shifts from training runs to serving billions of daily queries, inference is where the recurring costs and the recurring revenue increasingly live. A raise this size suggests investors expect that serving layer to be one of the most durable, and most lucrative, pieces of the entire AI stack.

_Section: [AI Funding Tracker](https://www.wortins.com/funding) · Source: Crunchbase News · Published Friday, September 11, 2026_

## Wortins' read

Fluidstack has secured $1.5 billion in new funding, led by Jane Street Capital, at an $18 billion valuation. The company provides AI inference infrastructure, the compute layer that actually runs trained models when users send them requests, as opposed to the separate and often larger job of training those models in the first place. The lead investor is worth noting. Jane Street is a quantitative trading firm, not a traditional venture backer, and its appetite for a compute provider signals how mainstream financial players now view AI infrastructure as a core asset class rather than a speculative tech bet. As deployed AI shifts from training runs to serving billions of daily queries, inference is where the recurring costs and the recurring revenue increasingly live. A raise this size suggests investors expect that serving layer to be one of the most durable, and most lucrative, pieces of the entire AI stack.

## Source

[Read the full story at Crunchbase News](https://news.crunchbase.com/venture/biggest-funding-rounds-crusoe-fluidstack-multibillion-dollar-ai-infrastructure/)

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