The AI Boom Reshapes a Core Global ETF

Often positioned as a foundational tool for global diversification, the iShares MSCI World ETF (URTH) presents a more concentrated reality upon closer inspection. Its performance, boasting a gain of over 20.5% year-to-date (as of December 10, 2025), is being propelled not by broad international exposure but primarily by the formidable strength of U.S. technology giants. This raises a critical question for investors: how globally diversified is a portfolio increasingly dominated by a handful of American megacaps?

A Portfolio Dictated by Top Holdings

The fund’s trajectory is overwhelmingly steered by its largest constituents. While it technically holds over 1,300 securities, the top ten positions now account for approximately 27% to 28% of the entire portfolio. Nvidia has emerged as the dominant holding with a 5.34% weighting, closely followed by Apple at 4.98% and Microsoft at 4.11%. This heavy tilt means the ETF’s strategy increasingly resembles a “U.S.-plus” approach rather than a genuinely global portfolio, with around 70% of assets invested in the United States.

This concentration has effectively shielded investors from volatility in emerging markets but has simultaneously created a significant dependence on the U.S. economic cycle. Other developed nations play markedly smaller roles: Japan represents about 6% of the fund, with the United Kingdom at roughly 4%.

Should investors sell immediately? Or is it worth buying MSCI World ETF?

Strategic Shift Toward AI Infrastructure

A pivotal change driving this composition was the index’s semi-annual review in November 2025. The inclusion of CoreWeave, a U.S. digital infrastructure specialist, directly responded to the sustained artificial intelligence boom. This move signals that the technology sector’s “infrastructure supercycle” is far from over. Consequently, the ETF is evolving away from broad diversification toward a more targeted weighting of tangible technology beneficiaries, extending beyond pure software companies.

Performance and Market Perception

The focus on high-quality U.S. equities has delivered strong results for investors. The fund’s 20.5% advance this year largely mirrors the momentum of the S&P 500, with its international components providing only a mild dampening effect on volatility. Market confidence is further evidenced by trading dynamics; the ETF trades nearly at par with its net asset value, indicating robust market mechanisms without liquidity concerns.

A clear conclusion remains: the iShares MSCI World ETF is not a true “All World” product, as emerging markets like China and India are excluded by definition. It serves primarily as a vehicle for exposure to developed economies, but its returns remain inextricably linked to the fortunes of major U.S. technology corporations.