Fractile raises £540m led by Thrive and Founders Fund
This article covers Fractile, a hardware startup, raising £540m in a Series C growth funding round co-led by Thrive, Founders Fund, Lightspeed and Redpoint, valuing the startup at more than £5 billion. The funding will be used to scale a vertically integrated approach to AI inference hardware from London and Bristol, aiming to improve inference throughput and cost efficiency and affecting AI startups, cloud providers and data-centre operations across the UK and Europe.
Fractile has raised £540 million in a growth funding round — reported as a Series C — co-led by Thrive, Founders Fund, Lightspeed and Redpoint, valuing the hardware startup at more than £5 billion. The cash will be used to scale a vertically integrated approach to AI inference hardware from London and Bristol, at a time when memory bandwidth is becoming a bottleneck for next-generation models.
Why it matters
The announcement matters because inference — the work AI models do when they generate answers — is expanding far faster than raw compute. Frontier models now process many more tokens per year, and applications such as agents, heavy reasoning and coding tools use far larger contexts than chat. That shift exposes a longstanding hardware constraint: memory bandwidth has not kept pace with compute, slowing real-world performance.
Fractile’s funding signals renewed appetite for companies that tackle the physical limits of AI, not just model architectures or cloud services. If its claims hold, faster inference at lower cost could change where and how European and UK AI workloads run, with implications for cloud providers, AI startups and data-centre economics.
Inside the product
Fractile builds inference accelerators and rack-scale systems and insists on owning the full stack: chip design, systems engineering, software and in-house machine learning research. Unlike many AI chip makers that use high-bandwidth memory (HBM) and rely on similar architectures, Fractile stacks DRAM directly on top of its logic. The company says this provides much higher memory bandwidth than HBM and greater capacity than SRAM-based alternatives, enabling large models to run at thousands of tokens per second even with very long contexts.
The approach targets inference throughput and cost efficiency. Investors in the round claim Fractile’s accelerators can serve the most advanced models more than ten times faster at a fraction of the cost, a performance delta that would be material for services where latency and token throughput determine user experience and operating expense.
Who are the investors?
The round was co-led by Thrive, Founders Fund, Lightspeed and Redpoint. Other participants include Balderton, the UK Government’s Sovereign AI Venture Fund, the British Business Bank and CapitalG. The raise follows a £160 million round six months earlier and a £5 million award from the Advanced Research and Invention Agency two years ago.
In the announcement, Joséphine Kant, Investment Partner at Sovereign AI, said:
Walter and the team at Fractile are taking on an ambitious challenge, with the potential to make a significant contribution to the global future of AI hardware. Their approach brings together deep expertise across chip design, software, and machine learning, and we believe it has the potential to compete with the very best globally.
In the announcement, Leandros Kalisperas, Chief Investment Officer at British Business Bank, said:
Fractile is pushing the frontier of AI forward by rearchitecting the hardware stack. Walter and his team are building chips designed to work faster and at greater capacity, allowing AI to reach new potential, scaling faster and more cost effectively. This is British innovation at its best - exceptional technical minds focused on building technology that can compete and win on a global stage. We’re proud to be backing them at this critical stage of growth.
In the announcement, Kanishka Narayan, AI Minister, said:
Fractile represents the very best of British ambition, bringing together world-class chip design, engineering and AI expertise to develop faster, cheaper and more energy-efficient hardware.
In the announcement, Phil Chambers, Partner at Balderton, said:
Walter and the Fractile team made a bold bet back in 2022: that the real limit on frontier AI would be how fast it can produce useful outputs, and that the only way to fix that at scale was to rebuild the hardware itself. 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. That kind of full-stack ambition is rare for a chip company, and it makes Fractile one of the most exciting places in the world right now for engineers who want to work on AI's hardest problems.
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Founder perspective
Fractile was founded in 2022 by Walter Goodwin. The team has focused on recruiting industry veterans with experience shipping silicon at scale and building out software, hardware, operations and supply-chain capabilities. The company’s strategy is uncommon in chips: instead of splitting design and system integration across partners, Fractile retains control of the entire stack to optimise for inference throughput and long-context performance.
The bigger picture
This raise arrives as UK industrial policy moves to back sovereign AI capabilities. The Budget confirmed a further £140 million for Sovereign AI and emphasised Physical and Industrial AI, a signal that hardware projects are now a policy priority as well as a commercial bet. For the UK and wider Europe, Fractile’s expansion highlights the region’s potential to host more than software-focused AI companies; it suggests opportunities for jobs across chip design, systems engineering and data-centre operations.
If Fractile can translate its architecture into reliable, mass-deployable hardware, it could shift some inference workloads away from incumbents or at least introduce meaningful competition. Either way, the deal underlines growing investor interest in hardware-first approaches to AI within the UK and European ecosystem.
They've invested in Fractile
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 Balderton Capital( ) Balderton Capital is a venture capital firm focusing primarily on technology and... London  | ||||
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