European AI stocks soar as investors hunt for the continent’s few winners

TL;DR:

• The top four performers in the Stoxx Europe 600 this year are all AI infrastructure plays: STMicroelectronics (more than doubled), Aixtron (+168%), BE Semiconductor (+87%) and Nokia (nearly +100%).
• The Stoxx Europe Total Market Semiconductors index is up roughly 74% in 2026, against around 2% for the broad Stoxx Europe 600 — a striking divergence inside a flat market.
• For UK pension funds and discretionary managers running European mandates, the AI trade has narrowed to a handful of names, with valuation pressure already visible (STM on a forward P/E of about 37, Aixtron about 47).

European AI exposure has moved from US-only to global, with investors picking through the continent’s smaller chip and equipment names in search of “picks and shovels” for the AI buildout. Emmanuel Cau, head of European equity strategy at Barclays, called it a “gold rush” in the sector, telling the FT that “whoever is investing in Europe is desperate to get a claim on this AI trade”.

What is actually rallying

The leaders are deeply technical names: STM and BE Semiconductor make analog chips and back-end packaging tools, Aixtron sells deposition equipment for compound semiconductors, and Nokia provides the optical and data-centre connectivity hardware behind cloud workloads. Smaller, mid- and micro-cap French firms have rallied even harder: Soitec, Kalray and Riber have all at least tripled this year, with Soitec up more than five-fold from a base where it had previously lost 90% of its value.

Kasper Elmgreen of Nordea Asset Management told the FT investor attention has shifted away from the Goldman Sachs-coined “Granolas” — the 11 European mega-caps in healthcare and luxury — toward “strategic autonomy” exposures including tech. Electrification and grid plays such as Prysmian (+71%) and Siemens Energy (+43%) have also benefited as a derivative AI bet.

UK context and what is missing

For UK readers, the rally underscores a structural problem the British government’s Sovereign AI Fund is explicitly trying to address: the London market has very little direct large-cap AI exposure of its own. The FTSE 100’s largest tech name remains data-and-events group RELX, not a chip or infrastructure play, and ARM Holdings — the most natural UK-listed AI beneficiary — is listed in New York. UK active managers wanting “European AI” are effectively forced into the same narrow Dutch, French and German basket every other investor is buying, with Nokia and ASML as the only liquid large-cap options.

Looking forward

Crowding is now the dominant risk. Hedge funds including Two Sigma have already built a roughly 4.5% short position in Soitec, and Cau warned of crowding in specific stocks. With STM and Aixtron trading on forward multiples that price in years of capex-cycle continuity, any softening of US hyperscaler order books — or a slip in next-leg AI capex commentary from Nvidia in late May — would hit this group disproportionately. UK trustees and fund selectors carrying European AI overweights should expect their managers to start lightening these positions before the market does it for them.