European equities declined as investors adjusted their outlook on the Federal Reserve’s interest rate trajectory and questioned whether planned investments in artificial intelligence (AI) will yield timely returns. The pan-European STOXX 600 index fell by nearly 0.9%, reflecting a broader reassessment of growth prospects tied to easy money and AI-related spending.

Traders now anticipate the Federal Reserve to raise rates by half a percentage point by year-end, according to futures-based data from the CME Group’s FedWatch Tool. Higher rates increase borrowing costs and pressure companies heavily reliant on debt for expansion, particularly in sectors such as AI where spending has surged but profitability remains uncertain.

The European Central Bank (ECB) added to market unease after raising its deposit facility rate by 25 basis points earlier in the month to 2.25%, marking its first hike since late 2023. Although ECB officials noted inflation remains contained without threatening longer-term price stability, investors expect another rate increase this year, further tightening financial conditions and weighing on equities and bond yields.

These developments highlight the vulnerability of the AI investment boom, which involves roughly $600 billion in capital expenditures projected for 2026. As financing costs rise, markets are increasingly scrutinizing whether the rapid pace of AI spending will translate into sufficient earnings growth to justify the risks.

The strain extends beyond Europe. Asian markets, including South Korea’s Kospi index, have seen sharp declines tied to the semiconductor sector, a major driver of AI technology. Heavyweights like Samsung Electronics and SK Hynix experienced significant sell-offs, exemplifying how sensitive AI-related equities are to shifts in monetary policy.

For global investors, the recent market moves represent more than short-term volatility; they point to a fundamental recalibration of growth expectations. The sustained upward pressure on rates tests whether AI-driven expansion can maintain momentum under tighter financial conditions, with potential implications far beyond technology stocks, affecting broad market indices and long-term investment portfolios reliant on steady earnings growth.