Fractile raises USD 720m at a USD 7bn valuation to build faster AI inference chips
The London and Bristol based chip designer has raised more than three times what it took in its Series B in May. UK government funds joined US growth investors, and the first commercial chip is planned for 2027.
Fractile, a London and Bristol based start-up that designs chips for running AI models, has raised USD 720 million in a Series C round at a post-money valuation of USD 7 billion, its investor Balderton announced on Wednesday 11 November. The round was co-led by Thrive Capital, Founders Fund, Lightspeed and Redpoint.
The UK government's Sovereign AI Venture Fund and the British Business Bank also invested, the government said, describing a round worth more than GBP 500 million that values the company at over GBP 5 billion. Fractile told Reuters the round was led by the four US firms, making it one of Britain's most valuable technology start-ups.
Who is investing
Besides the four co-leads, the investors include Google's venture arm CapitalG, BlackRock, DST Global, Dragoneer, T. Rowe Price, Elad Gil, SV Angel and Balderton, according to Balderton, Reuters and EU-Startups. EU-Startups also lists Bain Capital Ventures, Shopify Ventures, Felicis, Gigascale Capital and 20VC. Growth investor Georgian said it joined as well and named Accel, Conviction and Felicis as returning investors.
The government did not disclose how much its funds put in. Its notes to editors say Sovereign AI's typical equity investments are around GBP 1 million to GBP 10 million and that, like most venture funds, it does not comment on specific investment figures. Sifted, which first reported the raise weeks ago, put the confirmed round at about GBP 540 million.
A fast step up
Fractile was founded in 2022 by Walter Goodwin, the chief executive, and Yuhang Song. Goodwin previously did doctoral research in robotics and AI at the University of Oxford, EU-Startups reported. The company raised a USD 15 million seed round in 2024 and a USD 220 million Series B in May 2026, according to EU-Startups. The new round is more than three times the size of the Series B.
What Fractile is building
Fractile designs hardware for AI inference, the stage at which a trained model produces answers, rather than for training models. Its bet, Balderton said, is that the most capable AI systems will be held back by how long they take to generate useful outputs, and that fixing this means rethinking the chip itself.
Most AI accelerators today rely on high-bandwidth memory (HBM) placed next to the processor. Fractile instead packages DRAM directly on top of its logic. According to Balderton, this gives far higher memory bandwidth than HBM and much more capacity than on-chip SRAM, so that large models can run at thousands of tokens per second even with very long contexts. The company designs its own chips, systems and software and does its own machine learning research.
"By stacking DRAM directly on top of logic, and owning every layer from silicon to systems, software and core ML research, they have built an architecture that delivers both speed and scale," said Phil Chambers, partner at Balderton.
Still pre-revenue hardware
The claims have yet to be proven at scale. Fractile plans to launch its first commercial chip next year, Reuters reported, and EU-Startups noted that the promised performance and efficiency gains still await validation in widespread production use. The market it is entering is dominated by Nvidia and a small number of Asian chip manufacturers, according to Reuters.
Why London cares
The government presents the deal as part of its plan to keep more of the value from British research in the country. "For too long, Britain has produced some of the world's best scientific ideas, only to see too much of the technology, industry and wealth they create built elsewhere," AI minister Kanishka Narayan said. Business secretary Jonathan Reynolds said Fractile plans to expand its presence in Bristol.
The announcement comes two weeks after the UK Budget, in which the government confirmed a further GBP 140 million for Sovereign AI and expanded the British Business Bank's investment capacity by GBP 5 billion to GBP 30.6 billion. We covered those measures in our report on the Budget's national wealth fund and British Business Bank plans.
What it means for European founders and investors
Fractile's round is far larger than the other European AI hardware rounds that EU-Startups lists for 2026. This week alone we reported on Tendrils' USD 30 million seed round, also backed by the UK Sovereign AI Fund, and Sparxity's Series A in Dresden. In Spain, Openchip's larger round has stalled even as it secured public loans, a reminder that capital is concentrating in a few names.
For founders, the round shows that US growth funds will pay up for European deep tech when the technical bet is clear and the team is strong, and that government co-investment now often sits alongside them rather than replacing private money. For investors, the valuation leaves little room for delays: Fractile has to deliver working silicon on schedule in 2027 and win customers in a market where Nvidia sets the pace.
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