21SEP

AI takes record 44% of UK equity market

2 min read

16:52UTC

AI companies took a record 44% of UK smaller-business equity value in 2025, even as the total market shrank 4% to £12.3bn.

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Key takeaway

Record AI concentration is hollowing out the UK's seed and spinout funding beneath a shrinking total market.

AI companies took a record 44% of UK smaller-business equity value in 2025, from a market that shrank 4% to £12.3bn, the British Business Bank (BBB), the UK government's development bank, reported on 2 July 2026 ¹. AI investment rose 48% over the year while every other sector contracted in both share and cash. The top 10 fundraisings absorbed 23% of all investment, the highest concentration since 2020, and seed deals fell 27%.

The BBB's chief investment officer, Leandros Kalisperas, said the concentration into AI reflects both the scale of the opportunity and the challenges across the wider market ². The tracker measures the value of equity raised, not the number of companies funded, so a record share can sit on top of fewer names taking larger cheques.

A 48% rise in AI money against a 4% fall in the total meant growth-stage rounds pulled capital up and out of everything beneath them. The same barbell shape carried PhysicsX to a $300m round at a $2.4bn valuation in June . Fewer companies, larger cheques, one sector.

Deep Analysis

In plain English

The British Business Bank, the government's own economic development bank, publishes an annual scorecard on how much money young British companies raise by selling shares, known as equity funding. Its 2025 edition found AI companies grabbed a record 44p of every pound invested, even though the total pot shrank 4% to £12.3bn. That matters because seed rounds, the small first cheques that get a brand-new company off the ground, fell 27% over the same year. Money is increasingly flowing to already-large AI companies rather than to first-time founders starting from nothing.

Deep Analysis

Root Causes

AI-stage companies need far larger cheques than software-only peers at the same maturity, because training and inference compute costs push burn rates several times higher for the same set of milestones. That mechanical cost structure, not investor taste alone, pulls a disproportionate share of total capital toward AI even when deal counts stay flat.

The 27% fall in seed deals compounds the effect from the other end: removing smaller, cheaper first cheques shrinks the denominator, so a thinner bottom of the market mechanically inflates AI's percentage share of what remains.

What could happen next?

Risk
A sustained funding squeeze on non-AI seed-stage founders could thin the pipeline of future UK scale-ups outside artificial intelligence.
Consequence
Institutional and pension-linked funds carrying UK venture exposure are increasingly betting on one sector's valuations holding up.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The UK's 2000-2001 dot-com contraction saw internet-sector deals halve while telecoms and infrastructure funding held broadly flat, the same divergence visible now between AI's rising 44% share and the market's 4% overall decline: one narrative concentrating capital even as the wider base shrinks.

Counter-parallel: The 2015-2018 UK fintech run shows the opposite path: a single sector's dominance coincided with a growing overall market, not a shrinking one, so concentration alone does not prove the base is weakening.

Consensus view: Beauhurst's deal-tracking team reads the 44% AI share as a round-size effect rather than a demand shift: AI's share of deal count barely moved on 2024, but its cheques got far larger, the same barbell pattern PhysicsX's $2.4bn Series C showed in June .

Counter-view: Onward's enterprise policy team argues the concentration is a genuine reallocation, not statistical noise, because UK model and infrastructure firms only became investable at scale this year, pulling in capital that previously spread across fintech and consumer software.

Key tension: Whether the 44% figure reverts once this year's handful of mega-rounds cycle out of the count, or marks a lasting narrowing of what British venture capital is prepared to fund.

Sources:British Business Bank

Mentions:Beauhurst →Onward →British Business Bank →Small Business Equity Tracker →PhysicsX →CuspAI →

First Reported In

Update #10 · AI takes record 44% as UK equity shrinks

British Business Bank· 4 Jul 2026

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Causes and effects

Caused by

PhysicsX hits $2.4bn on Temasek cash

PhysicsX's $300m Series C exemplified the AI-concentration barbell the BBB tracker now confirms nationally.

Occurred 8 Jun 2026

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UKRI confirms 58% cut to STFC labs

The STFC cuts extend the market-narrowing pattern the Bank's 2 July tracker showed in AI's record equity share.

Occurred 9 Jul 2026

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This Event

AI takes record 44% of UK equity market

AI megarounds are draining capital from the seed and spinout tiers, the first hard 2025 dataset to show it.

Led to

Dealroom projects $34.2bn for UK tech

The 44% AI equity-share record set the concentration pattern Dealroom's week-on-week figures now repeat.

Occurred 23 Jul 2026

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UK chip exits hit six, a five-year low

AI's record 44% equity share last year sits behind this year's uneven semiconductor and robotics figures.

Occurred 24 Aug 2026

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Ten raises took 75.2% of life sciences

The life-sciences concentration mirrors the British Business Bank's finding that AI took 44% of smaller-business equity value last year.

Occurred 10 Sept 2026

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Different Perspectives

Nscale and Open Cosmos

Nscale chose the New York Stock Exchange for its listing on 18 September, putting Britain's largest AI infrastructure bet to American public investors rather than British ones. Open Cosmos took the opposite route four days earlier, raising nine figures from an all-domestic syndicate on five years of profit, evidence that staying is possible when the balance sheet allows it.

Dame Chi Onwurah and the Science, Innovation and Technology Committee

Committee chair Dame Chi Onwurah wrote to government on 7 September asking how Matt Clifford's conflict at ARIA arose and what safeguards protect its governance, and expects a detailed response. Her question has not yet been put to the Sovereign AI Unit, whose own chair sits at a venture capital firm while overseeing state AI equity.

The Entrepreneurs Network

The Entrepreneurs Network's founder survey found 65% say Britain is easy to start a business in but only 14% say it is easy to scale one, with 82% negative on tax and 74% finding investment hard to access. On this reading the constraint is regulation and tax, not the capital-vehicle design the state keeps adjusting.

New Economics Foundation

The New Economics Foundation argues fiscal accounting rules, not political will, cap what Britain's state capital vehicles can do. Matching the KfW and Bpifrance benchmark of 1% of GDP would need the National Wealth Fund to deploy roughly GBP21bn a year by 2028-29, about four times its current capacity.

Competition and Markets Authority

The CMA's 8 September report on public procurement asked whether Britain's roughly GBP400bn state-spending system is built to grow high-potential firms rather than simply widen SME participation. Its Recommendation 5 calls for a dedicated frontier-technology procurement framework, an official acknowledgement that today's design may serve the wrong target.

Highland Europe

Highland Europe, the growth-equity firm behind a €1bn-plus fund, took €65m from the British Business Bank into its Technology Growth Fund VI on 30 July via British Patient Capital. For a Geneva-based growth investor, the Bank's cheque is routine cornerstone capital, unrelated to which Whitehall department currently claims to sponsor UKRI.