AI businesses received 44% of all equity investment into UK smaller businesses in 2025, the highest share on record. But that increase came as overall funding fell 4% to £12.3 billion, according to a report by the British Business Bank. AI-related deals rose by 48% year-on-year, the study said, although these were driven by a handful of “megadeals” There were weaker funding conditions for smaller businesses overall, with investors putting capital into fewer, larger transactions.