MSCI World ETF’s Tech-Led Rally Confronts Earnings and Index Overhaul

A significant methodological shift is set to reconfigure one of the world’s most-tracked equity benchmarks, directly impacting the $8 billion iShares Core MSCI World ETF. MSCI will implement changes to its free-float calculation methodology starting with the May 2026 index review, potentially increasing portfolio turnover for funds that track it. The reform, finalized after a consultation in January 2026, will classify equity total return swaps between non-free-float and free-float shareholders as non-free-float and update threshold calculations for insurance companies in certain European nations and sovereign wealth funds outside their home countries.

This structural change arrives as the ETF, which holds approximately 1,300 stocks from 23 developed markets, navigates a pivotal earnings season dominated by its largest holdings. The fund’s performance is heavily concentrated, with over 70% of its weight in US equities and the technology sector alone accounting for about 26%. Its top positions—NVIDIA, Apple, and Microsoft—collectively make up nearly 14% of the portfolio.

The immediate market focus, however, is on Tesla’s first-quarter 2026 results. The electric vehicle maker delivered roughly 358,000 vehicles for the period, missing market expectations. Analysts project revenue of $22.3 billion and earnings per share of $0.36. More concerning was a 38% quarter-over-quarter collapse in energy storage deployments to 8.8 gigawatt-hours. In Tesla’s crucial California market, vehicle registrations fell by almost a quarter as hybrids gained significant share. Despite these challenges, the stock trades at 185 times expected earnings, a premium almost entirely reliant on its Robotaxi project, which faces established competition from Waymo in newly expanded markets like Dallas and Houston.

Financial stocks, the fund’s second-largest sector allocation, provide a counterbalance. Major US banks including JPMorgan Chase and Morgan Stanley have already posted strong quarterly results, fueled by record equity trading revenue and double-digit revenue jumps.

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

The earnings spotlight shifts next week to portfolio heavyweights Microsoft and Apple. Microsoft reports on April 29, with TD Cowen recently lowering its price target on the software giant to $540, citing tight graphics processing unit capacity. Apple follows on April 30, with analysts forecasting revenue growth of up to 16%. These reports will test the drivers behind the ETF’s 21.36% total return in 2025, which has been powered by artificial intelligence, semiconductor demand, solid corporate fundamentals, and expectations for lower interest rates.

Currently trading at $194.75—just 0.53% below its 52-week high—the ETF shows signs of being overbought, with its Relative Strength Index at 94.6. The broader outlook for developed markets in 2026 remains constructive, supported by fiscal policy, deregulation, and AI-driven profit growth, though geopolitical risks and supply chain concerns persist.

Meanwhile, a fee war is applying pressure, with some competitors lowering their expense ratios. The iShares ETF maintains an annual fee of 0.24%. The fund’s future trajectory now hinges on both the immediate verdict from tech earnings and the longer-term compositional shifts mandated by MSCI’s May 2026 index overhaul.