Rebalancing Day Approaches for the World’s Largest ETF, Where Tech Giants Already Call the Shots

The iShares Core MSCI World UCITS ETF, a behemoth with more than $140bn in assets (€119.1bn), is about to undergo a scheduled index reshuffle that will bring in a fresh batch of US stocks while the fund’s existing tech-heavy tilt takes centre stage. On 29 May, MSCI will implement its latest quarterly review, forcing the ETF to execute hundreds of trades to align with the updated benchmark.

Three US companies are set to enter the MSCI World Index as the largest additions: Medline A, MasTec and TechnipFMC. Simultaneously, a number of equities are dropping out as market capitalisations shift across the developed markets the index covers. The fund currently tracks roughly 1,300 individual names using an optimised sampling methodology, but the new entrants will not dilute the overwhelming influence of its top holdings.

That influence is laid bare in the portfolio data from 19 May 2026. Nvidia leads the pack with a 6.14% weighting, followed by Apple at 4.95% and Microsoft at 3.34%. Amazon accounts for 2.85%, and Alphabet Class A for 2.59%. Broadcom, Meta, Tesla and JPMorgan Chase also feature among the ten largest positions, which together claim 27.91% of the fund’s net assets. For a product holding 1,308 stock positions, that concentration is striking and underscores the practical limits of broad index diversification.

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The ETF’s sector breakdown reinforces the same picture. As of 24 April, sensitive sectors represented 54.60% of the portfolio, cyclical industries 29.28% and defensive sectors just 16.12%. That leaves the vehicle acutely exposed to the forces that move growth stocks – chiefly inflation expectations, bond yields and sentiment out of Wall Street. Dividends are automatically reinvested inside the fund, a design that suits long-term total return investors but offers no income stream.

Despite the index overhaul, the ETF’s underlying performance remains compelling. The shares recently changed hands at €120.85, a whisker below the 52-week high and up roughly 8% since the start of the year. The long-term uptrend stays intact, with the price comfortably above its 50-day moving average. The rebalancing will take effect after the close on 29 May, and from the next trading day the fund’s weights will reflect the updated market reality.

All this comes at a time when the valuation of the portfolio is far from cheap. The price-to-earnings ratio sits at nearly 25, while the price-to-book multiple approaches four. Yet the iShares ETF continues to command market leadership with an annual total expense ratio of 0.20% – a fee that some European rivals undercut by almost half. What it lacks in cost advantage it makes up for in liquidity, with deep order books on exchanges such as Xetra and the London Stock Exchange.

The dominance of US technology in the MSCI World is not a flaw in the product; it is a direct consequence of market-cap weighting in a benchmark that covers 23 developed countries and roughly 85% of their listed equities. That structural feature will persist long after the May rebalancing is done. Investors who buy this ETF for global diversification are, in practice, making a big bet on a handful of American tech titans – a bet that will only grow larger if those stocks keep climbing.

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