AI captures record 44% of UK smaller business equity in 2025
The UK's startup equity market is concentrating fast around artificial intelligence, according to the British Business Bank's Small Business Equity Tracker 2026, published Thursday. AI companies claimed 44% of all equity investment into UK smaller businesses in 2025, the highest share on record, even as total market funding slipped 4% to £12.3bn. The figure marks a near-doubling of AI's deal-count share since 2022, with investment into AI-related transactions rising 48% year on year.
The data captures something structurally significant: investor capital is not simply flowing into AI as a sector preference. It is actively withdrawing from everything else. Growth-stage AI deals proved resilient, but early-stage activity across the broader market fell sharply, with seed deals down 27% and venture-stage deals down 13% in 2025. The top ten fundraisings alone accounted for 23% of all investment, the highest concentration since 2020, a barbell effect that leaves most sectors and stages competing for a diminishing share of available capital.
The spinout paradox
One of the report's more nuanced findings concerns university spinouts. On a five-year view, the UK's record is genuinely strong: VC deal volumes for spinouts rose 95% between 2021 and 2025 compared with the prior five-year period, outpacing the United States, Germany and France on a research-base-adjusted basis. The UK had more VC-backed spinouts per unit of research base than any of its major comparators. Yet 2025 itself told a different story, with spinout equity deals falling 33% and investment value collapsing 51% year on year, suggesting the pipeline is healthy but near-term funding conditions are difficult.
For cross-sector investors, this divergence matters. Deep-tech and life-sciences spinouts, which historically represent the most capital-efficient path from academic IP to commercialisation, are facing the same funding squeeze as the broader early-stage market. The structural pipeline is intact; the near-term capital flow is not.
Regional rebalancing and the wider capital picture
Beyond the AI concentration story, the data points to a quiet but meaningful geographic rebalancing. The North West of England recorded an 82% rise in equity investment, Scotland was up 74%, and the South West surged 104%, driven in part by a small number of large AI and energy deals. London's share of total UK equity investment fell from 60% to 57%, a shift that, while modest in percentage terms, represents real capital moving into regional ecosystems that have historically been underfunded.
Leandros Kalisperas, Chief Investment Officer at the British Business Bank, noted that concentration into AI reflects both the scale of the opportunity and the challenges in the wider market, adding that ensuring capital is available across sectors and stages will be critical to maintaining a diverse and competitive pipeline of UK companies.
The British Business Bank's own role is worth contextualising. The government-backed institution supported 15% of all deals and 16% of investment between 2023 and 2025. Its new Five-Year Strategic Plan commits to increasing annual deployment by two-thirds, unlocking an estimated £26bn of private capital alongside £13bn of its own funding, with £4bn earmarked for the government's eight Industrial Strategy priority sectors.
For macro investors, the strategic read-across extends beyond the UK. The AI concentration in smaller business equity mirrors dynamics in US and European VC markets, where megadeals in foundation-model infrastructure and applied AI are compressing available capital for adjacent sectors including life sciences, clean energy and advanced manufacturing. The British Business Bank's data suggests that without deliberate counter-cyclical intervention, from development banks, sovereign vehicles or patient corporate capital, the convergence era risks producing a funding monoculture: deep in AI, thin everywhere else.