European stock indices have been climbing steadily in 2026, powered by a surprisingly potent force: the continent’s AI hardware and infrastructure companies. The STOXX Europe 600 has risen approximately 10-11% year-to-date as of early August, with AI enablers like ASML and Infineon acting as significant contributors to that growth.
The numbers behind the rally
European AI-related stocks in the semiconductor supply chain have gained over 100% year-to-date by mid-2026. Sweden’s Sivers Semiconductors has been the standout performer, soaring more than 2,000%.
According to analysis from TS Lombard, AI-themed stock baskets contributed to over two-thirds of the positive performance in European equities during a period ending in May 2026. Those gains matched what investors saw in the Nasdaq over the same stretch.
The DAX, CAC 40, and FTSE MIB have all reached or approached record highs, lifted by the same tailwind.
Why Europe, and why now
ASML is the clearest example. The Dutch company holds a near-monopoly on extreme ultraviolet lithography machines, the tools required to manufacture the most advanced chips on the planet. In July 2026, ASML adjusted its full-year revenue forecast upward, citing robust AI-driven demand for its equipment.
Infineon, the German semiconductor manufacturer, has similarly benefited from the surge in demand for chips that power AI workloads.
The EU has been actively courting AI investment with targeted initiatives aimed at channeling roughly €200 billion into the sector. In July 2026, proposals emerged for up to seven AI Gigafactories designed to enhance the continent’s computing capabilities and support industrial AI adoption.
What this means for markets
If AI-themed baskets are driving two-thirds of European equity performance, any fund manager underweight these names is effectively betting against the dominant market force.
A stock gaining 2,000% in half a year, as Sivers Semiconductors has, invites scrutiny about whether the underlying business can grow into that price. Small-cap names at the fringes of the AI supply chain are particularly vulnerable to sharp corrections if sentiment shifts.
For the larger players like ASML and Infineon, the thesis rests on concrete demand signals rather than narrative alone. ASML’s upward revenue revision in July was not a vibes-based forecast. It reflected actual order flow from chipmakers scrambling to build capacity for AI workloads.