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MSCI World vs S&P 500: differences and which to choose

July 10, 2026 7 min read

If you are considering index funds, sooner or later the question arrives: MSCI World or S&P 500? Both are excellent, low-cost indices, but they represent different things.

What each one holds

S&P 500: the ~500 largest listed companies in the United States. Concentrated in a single country (though many of those companies are multinationals selling worldwide).
MSCI World: over 1,000 large and mid-cap companies across 23 developed countries (US, Europe, Japan, etc.). It is global, though it does not include emerging markets.

The key difference: geographic diversification

The MSCI World spreads your investment across more countries, reducing the risk of depending on a single economy (see what diversification is). The S&P 500 bets everything on the US.

Here is the nuance that surprises many people: the US makes up around 70% of the MSCI World itself. In other words, even though the MSCI World is "global", a large part is already the United States. That is why the two indices overlap heavily and their historical behaviour is more similar than you might expect.

Currency

As a euro-based investor, in both cases you take on exchange-rate risk (mainly EUR/USD). It is not exclusive to either; currency-hedged versions exist if you want to neutralise it, usually in exchange for a slightly higher TER.

What about historical returns?

We don't invent figures: you can see each one's real year-by-year return in our "How much would you have?" simulator. The general takeaway is that in recent decades the S&P 500 has run very strong, but past returns don't guarantee future returns, and concentrating everything in one country means taking on more specific risk.

Try it yourself: use the compound interest calculator to simulate your case with your own numbers, see the charts and find your break-even point.

How to choose (without the drama)

If you want maximum diversification and simplicity, the MSCI World (or a "global" that includes emerging markets) is a very reasonable all-in-one core option.
If you believe in the weight of the US and accept the concentration, the S&P 500 is valid and usually has very low TERs.
Many investors combine a global fund with some emerging markets; others stick to the MSCI World only. There is no single right answer: what matters is low cost, consistency, and not switching strategy at every swing.

Compare specific funds for each index, with their TER and ISIN, in our fund catalog.