Shares in Nebius Group, the Amsterdam-listed technology firm formerly known as Yandex, climbed sharply in after-hours trading on Tuesday, 21 July 2026, after a leaked internal memo revealed plans for a major artificial intelligence data centre expansion in Northern Europe.
According to sources familiar with the matter, Nebius intends to invest heavily in a new facility in Finland, designed to host high-performance computing clusters for AI training workloads. The project is expected to significantly boost the company's cloud infrastructure capacity, positioning it to compete with larger rivals such as Amazon Web Services and Microsoft Azure in the growing European AI market.
The after-hours surge saw Nebius stock rise by approximately 8.4%, adding roughly €1.2bn to its market capitalisation. The broader tech sector remained relatively flat, with the Nasdaq 100 edging up just 0.2% in regular trading. Analysts at Berenberg noted that the move reflects 'a renewed appetite for pure-play AI infrastructure plays' among institutional investors.
For UK investors and pension holders, the development underscores the increasing importance of AI infrastructure as a long-term growth theme. Many UK pension funds hold indirect exposure to Nebius through global technology exchange-traded funds. However, the stock remains highly volatile, with a beta of 1.8, meaning it tends to move nearly twice as much as the broader market.
Industry observers caution that while the expansion plan is ambitious, execution risks remain. 'Building out AI data centres requires enormous capital expenditure and specialised engineering talent,' said Sophie Clarke, an analyst at Peel Hunt. 'Nebius will need to demonstrate it can deliver on time and on budget to justify the current valuation.'