US market's tech dominance sparks renewed focus on global diversification strategies

The S&P 500’s increasing dependence on a handful of large technology and growth stocks is reviving an old lesson for investors: diversification can matter most when a market is working best. According to VanEck, the index’s 10 biggest constituents now account for about 40% of its weight, roughly double their share a decade ago, leaving many portfolios more exposed to a narrow group of names than they may realise.

That concentration has helped power strong returns in recent years, but it also means a standard passive allocation to the benchmark is no longer as broad as it once was. In practice, investors who think they own a wide slice of the US market may instead be taking a large implicit bet on a small cluster of mega-cap stocks and the sectors they dominate. VanEck argues that this can cut both ways: the same names that have driven gains could also amplify losses if sentiment turns.

One response gaining renewed attention is developed international equities. MSCI data show the MSCI EAFE index, which tracks large and mid-cap companies in developed markets outside the US and Canada, had 689 constituents and a forward price-to-earnings ratio of 15.54 as of 29 May 2026. That is meaningfully lower than the roughly 22 times forward earnings cited for the S&P 500 in VanEck’s analysis, underscoring the valuation gap that has brought global diversification back on to the agenda.

The case for looking abroad is not only about cheaper valuations. Analysts also point to the risk of unintended sector concentration in US-heavy portfolios, particularly where artificial intelligence enthusiasm has pushed exposure further into technology and semiconductor names. At the same time, corporate reform in parts of Europe and Asia, along with fiscal support in some markets, has improved the fundamental backdrop for developed international equities.

The MSCI EAFE universe is hardly a speculative corner of the market. It includes established global businesses across Europe, Japan and Australasia, with names such as Nestlé, Toyota, ASML and Novo Nordisk. MSCI’s own data show that related strategies, such as the EAFE Value index and the equal-weighted EAFE index, also trade at lower forward multiples than the US market, reinforcing the point that international diversification can add both valuation and style balance.

Against that backdrop, VanEck is pitching VEFA as a way to move beyond pure market-cap exposure. The fund seeks exposure to around 100 large and mid-cap developed market companies outside the US and Canada, while using analyst sentiment signals to tilt towards firms with improving revisions. It tracks the MSCI EAFE Analyst Sentiment Select Index and rebalances quarterly, with the aim of keeping ex-ante tracking error below 4% versus the parent EAFE benchmark.

The appeal of that structure is straightforward: it tries to reduce the concentration risk embedded in an S&P 500-only portfolio without simply replacing it with a generic overseas allocation. By adding a sentiment screen, the strategy aims to pair geographic diversification with a modest fundamental tilt. The trade-off is that it introduces an active element relative to a plain index fund, but that may be a compromise some advisers are willing to consider as US market leadership becomes ever more narrow.

For investors who have grown accustomed to treating the S&P 500 as a complete equity solution, the message is less about abandoning the benchmark than about recognising what it now represents. A top-heavy index can still be a useful core holding, but it may no longer be enough on its own if the aim is to spread risk more evenly across regions, sectors and company types.