A Shift in Global Exposure: MSCI World ETF Trims US Holdings

The world’s largest equity ETF is signaling a notable strategic pivot. During its first quarterly rebalancing for 2026, the iShares Core MSCI World UCITS ETF has decreased its allocation to American stocks for the first time in years. This adjustment, which took effect in early March, comes as the fund integrates companies from emerging sectors like AI hardware and space infrastructure. Meanwhile, the index provider is preparing for a more substantial methodological overhaul later in the year.

The recent changes reveal a clear asymmetry in portfolio management. The fund added 18 new holdings while removing 27 existing ones. The rebalancing was particularly pronounced for US equities, where 15 deletions outweighed just eight additions. This has resulted in a slight yet symbolically significant reduction in US dominance. Despite this shift, the American market retains its overwhelming influence, accounting for over 70% of the portfolio and driven by technology giants such as Nvidia, Apple, and Microsoft.

Elevated Trading and Thematic Additions

Trading activity around the rebalancing date surged, with volume spiking to more than 486,000 ETF shares—nearly double the average. Such spikes are typical for passive funds, which are obligated to adjust their holdings to mirror their benchmark index precisely. The ETF absorbed this volume surge without issue, closing at a price of 111.61 Euros and showing a solid 12-month gain of 15.44%.

The most prominent new additions are firms positioned to benefit from growing demand for AI hardware and satellite-based communications. Concurrently, the fund divested from several international names.

Should investors sell immediately? Or is it worth buying iShares Core MSCI World UCITS ETF USD (Acc)?

• Key Additions (US): AST SpaceMobile A, Coherent Corp, FTAI Aviation
• Key Additions (Japan): Ibiden, Shimizu
• Notable Exclusions: Edenred (France), Trend Micro, Tokyo Metro (both Japan)

May’s Overhaul and the Immediate Fed Focus

Market observers interpret the relatively moderate March adjustments as strategic caution. The index provider aims to avoid major disruptions ahead of a comprehensive methodological revision scheduled for May 2026. At that time, a new calculation logic for the free float adjustment will be implemented. This technical change is expected to alter the weighting of individual mega-cap stocks far more dramatically than the current reshuffling.

A previously debated change did not materialize in this rebalancing. MSCI has definitively abandoned plans to ban companies with substantial cryptocurrency holdings from the index. Firms whose crypto assets constitute more than 50% of their balance sheet will remain eligible for inclusion.

Before the structural realignment in May, immediate market attention turns to the US Federal Reserve. The central bank’s policy decision on March 17-18 will be a primary short-term performance driver for the ETF, given its continued heavy US concentration. The key question is whether the Fed will maintain its course toward potential interest rate cuts despite recent oil price shocks or pause its easing cycle.