WORLDTECHFractile Secures Over £500M in Series C With UK State Backing
What happened
The UK government announced on November 11, 2026 that its Sovereign AI Venture Fund and the British Business Bank are backing Fractile in a Series C (an early stage of company funding) round worth more than £500 million, valuing the London- and Bristol-based AI chip startup at more than £5 billion. The Series C follows Fractile’s May 2026 announcement that it had raised $220 million to build next-generation inference hardware.
CapitalG, Lightspeed and Redpoint are also investing. The British Business Bank said its backing is intended to help Fractile access long-term capital to scale its AI hardware technology in the UK, while Business Secretary Jonathan Reynolds said the company plans to expand its presence in Bristol.
The release does not break out the public investors’ individual contributions, describing them as commercially sensitive. Sovereign AI’s typical equity investments are around £1 million to £10 million, although each company’s circumstances differ.
Hardware Designed for Long-Running Inference Fractile was founded in summer 2022 around the premise that the time AI systems take to produce useful outputs would limit their impact. The company says it is building chips and systems to generate thousands of tokens (the small pieces of text a model reads and writes)—the units of output produced by a model—per second while supporting large models at very long contexts.
Its full-stack work spans chips, software and machine-learning research. The objective is faster, more energy-efficient and less costly hardware for inference (running a trained model to get an answer, rather than training it), the stage at which a model generates output.
The earlier company essay illustrated the scale Fractile is targeting. It said a model generating 100 million tokens at roughly 40 tokens per second would take about a month, while approximately 1,200 tokens per second would be needed to reduce that to a day.