S&P 500 vs MSCI World: Key Differences and Performance Data (2026)

Indexes such as the S&P 500 and the MSCI World track the performance of a specific group of stocks and serve as benchmarks for broad markets.

Both are widely used as the core of long-term portfolios, but which one suits yours better? And are they even that different?

In this article, we explore the differences between the S&P 500 and the MSCI World so you can make a better-informed decision: performance, country and sector exposure, concentration, currency risk, the ETFs available to European investors and where to buy them. All index data comes from the official factsheets as of 31 August 2026.

S&P 500 vs MSCI World (summary)

• S&P 500: 503 US large-cap stocks, 100% US. Its top 10 holdings represent 37.8% of the index, and the cheapest UCITS ETFs charge from 0.03% a year.
• MSCI World: 1,280 stocks across 23 developed markets, but still 72% US because of market-cap weighting. Its top 10 holdings represent 26.6%, and UCITS ETFs charge from about 0.10%.
• Performance: the S&P 500 has beaten the MSCI World over the past 10 years, driven by US tech, but not every year: in 2025 the MSCI World was ahead. Past performance does not guarantee future returns.
• Overlap: with 72% of the MSCI World already in US stocks, owning both adds little diversification.
• Currency: both are mostly USD exposure, which matters for EUR and GBP investors.
• The right choice depends on: your view on continued US outperformance, your comfort with concentration in a few mega-cap tech stocks and whether you want exposure to Japan, Europe and other developed markets.

Below, we break down each of these points in detail.

MSCI World vs S&P 500 compared in a nutshell

Here is the key data from this article in one table.

What are the S&P 500 and the MSCI World indices?

The Standard & Poor’s 500, known as the S&P 500, is the main benchmark for US equities. It includes 500 leading US companies (503 stocks, because some have two share classes) and covers about 80% of the US market’s available capitalisation. Many of its companies earn a large share of their revenue abroad, but the stocks themselves are US-listed and priced in USD.

The MSCI World Index tracks large and mid-cap stocks across 23 developed markets, covering about 85% of the free-float market capitalisation in each country. These are Australia, Austria, Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the UK and the US. It does not include emerging markets such as China, India or Brazil: for that, you need the MSCI ACWI (which adds emerging markets) or a separate MSCI Emerging Markets ETF.

Both indices use float-adjusted market-capitalisation weighting: larger companies get larger weights, and only freely tradable shares are counted. This is the industry standard, but it concentrates exposure in the biggest companies, as we’ll see below.

Performance

The S&P 500 has outperformed the MSCI World over the past decade, driven mainly by US large-cap technology stocks. However, this is not guaranteed to continue: there have been long periods (notably 2000 to 2009) when the MSCI World did better, and it was ahead again in 2025.

Be careful when reading this table: the two factsheets measure different things. The MSCI World figures include dividends, while the S&P 500 figures do not. Even without its dividends, the S&P 500 roughly matched the MSCI World’s total return over 10 years, so once dividends are included, the S&P 500 comes out ahead over the decade. Over the last one to five years, however, the gap has been small, and in calendar year 2025 the MSCI World returned 21.6% (with dividends) against 16.4% for the S&P 500 (without dividends, or about 18% with them).

To show the difference for a European investor, we compared two of the most popular UCITS ETFs: the iShares Core S&P 500 UCITS ETF (CSPX) and the iShares Core MSCI World UCITS ETF (IWDA). Both are Irish-domiciled and accumulating, so dividends are reinvested and the comparison reflects total return. In the chart below, orange is CSPX (S&P 500) and blue is IWDA (MSCI World).

Remember that past performance does not indicate future returns, and these results may not persist.

Country diversification

The MSCI World includes large and mid-cap stocks from 23 developed countries. Country weights follow float-adjusted market capitalisation, which is why the US dominates: American companies make up most of the value of developed-market equities.

The “Others” group includes the remaining 18 developed markets, such as Switzerland, Germany, the Netherlands, Australia, Italy, Spain, Sweden, Denmark, Hong Kong and Singapore. Despite the “World” name, nearly three-quarters of the MSCI World is in a single country, which matters if you are looking for real geographic diversification.

The S&P 500, by contrast, only includes large US companies listed on US exchanges.

But does a US-listed company carry 100% US country risk? Around 40% of S&P 500 companies’ revenues come from outside the US, so looking at where companies actually earn their money gives a better picture of your real country and currency exposure. Read more in our article on understanding your country and currency exposure.

Sector diversification

Both indices have a similar sector structure, with Information Technology in first place. The main differences: the S&P 500 has a much higher weight in Information Technology (about 8 percentage points more), while the MSCI World has more in Financials and Industrials, sectors that weigh more in Europe and Japan.

A few observations:

• Information Technology dominates both indices, but the S&P 500’s weight of about 38% is well above the MSCI World’s 30%, reflecting the US concentration in mega-cap tech (Nvidia, Apple, Microsoft, Broadcom, Micron).
• Including tech-adjacent sectors (Communication Services, which contains Alphabet and Meta, and Consumer Discretionary, which contains Amazon and Tesla), more than half of the S&P 500 is in “broadly tech” companies.
• The MSCI World has more Financials and Industrials: these sectors are more prominent in European and Japanese markets, which are in the MSCI World but not in the S&P 500.
• Energy and Materials are small in both indices, reflecting the shrinking weight of commodity-heavy sectors in developed markets.

Number of holdings

The MSCI World has 1,280 stocks across 23 developed markets, while the S&P 500 has 503 in a single market. The S&P 500 has more than 500 stocks because some companies have two share classes that are counted separately, such as Alphabet’s Class A (GOOGL) and Class C (GOOG) shares.

The MSCI World has about 2.5 times as many stocks, but the diversification benefit is smaller than that suggests. Because both indices are weighted by market cap, the largest companies dominate regardless of how many smaller stocks are included, and, as the next section shows, the same handful of US mega-caps top both lists.

Top 10 holdings

Both indices have exactly the same top 10 constituents, all US-listed mega-caps. The difference is the weight: each stock is a bigger share of the S&P 500 than of the MSCI World.

A few observations:

• Identical constituents: no non-US company appears in the MSCI World’s top 10, despite the “World” name.
• Concentration: the S&P 500’s top 10 weight (37.8%) is about 1.4 times the MSCI World’s (26.6%), and both are historically high.
• The “Magnificent 7” (Nvidia, Apple, Microsoft, Amazon, Alphabet, Meta and Tesla) make up 23.6% of the MSCI World, so even the “global” index has almost a quarter of its weight in seven US tech stocks. In the S&P 500, they account for most of the 37.8% top 10 weight.
• What this means for diversification: holding both an S&P 500 ETF and an MSCI World ETF mostly doubles your exposure to the same handful of stocks.

Concentration risk in the S&P 500

One of the biggest changes in equity investing over the past decade has been the rising concentration of the S&P 500 in a few mega-cap technology stocks. It matters because it changes the risk profile of what most investors assume is a broadly diversified index.

The concentration data

• The S&P 500’s top 10 holdings represent 37.8% of the index, and the largest, Nvidia, 8.1% on its own.
• Information Technology accounts for 37.9% of the index, before counting the tech-adjacent companies in Communication Services (Alphabet, Meta) and Consumer Discretionary (Amazon, Tesla).
• The MSCI World reduces this through geographic diversification, but its top 10 still represent 26.6%, because the same US mega-caps dominate global market cap.

Why this matters

Concentration creates three concrete risks for investors who believe they are broadly diversified:

• Single-company risk: an earnings miss or regulatory event at one of the top names can move the whole index. With Nvidia at 8.1% of the S&P 500, the index is significantly tied to one company.
• The passive concentration trap: of every €100 you put into an S&P 500 ETF, almost €38 goes into just 10 companies.
• Common-theme risk: the top holdings are no longer spread across unrelated industries. Today’s leaders are linked by artificial intelligence and the infrastructure behind it, so a change in sentiment on AI could hit several of them at once.

How does the MSCI World compare?

The MSCI World’s diversification advantage is real but more modest than “1,280 stocks” suggests. Because of market-cap weighting, the US mega-caps that dominate the S&P 500 are also its largest holdings, just at lower weights.

If concentration worries you, alternatives include:

• Equal-weight ETFs: such as the Xtrackers S&P 500 Equal Weight UCITS ETF (XDEW) or the Invesco S&P 500 Equal Weight UCITS ETF (SPEX), which give each company about the same weight (around 0.2%).
• MSCI World ex USA: developed markets without the US.
• MSCI ACWI: adds emerging markets to the MSCI World.
• Factor ETFs: value, quality or small-cap tilts that weight away from mega-cap growth stocks.

None of this means the S&P 500 is a bad investment: it has delivered exceptional returns precisely because of its concentration in the winners. But you should choose it knowingly, rather than assume you are getting broad diversification.

Currency exposure and risk

For European investors, currency is one of the most overlooked aspects of these indices. Both are dominated by USD assets, so EUR and GBP investors take currency risk on top of equity risk.

What’s the actual currency exposure?

• S&P 500: 100% USD. Many of its companies earn revenue worldwide, but the stocks are priced and settled in USD.
• MSCI World: about 72% USD, 6% JPY, 3.5% GBP, 3.5% CAD, with the rest spread across EUR, CHF, AUD and other developed-market currencies.

For a European investor holding CSPX, the return in euros is the S&P 500’s return plus or minus the change in the USD/EUR exchange rate. A 10% gain in the index combined with a 5% fall in the dollar against the euro leaves you with about 5% in euros.

Currency-hedged ETF options

If you want to remove this currency risk, EUR-hedged versions exist, such as the iShares S&P 500 EUR Hedged UCITS ETF (IUSE), the Xtrackers S&P 500 EUR Hedged ETF and the iShares MSCI World EUR Hedged UCITS ETF (IBCH). They cost more than their unhedged equivalents, so check the TER on the issuer’s website.

Should you hedge currency exposure?

The trade-off isn’t straightforward:

• Hedged ETFs have higher TERs than their unhedged equivalents.
• Hedging has a running cost (or benefit), which depends on the interest rate difference between the two currencies.
• Over long horizons, hedging does not usually improve equity returns much: it mainly smooths short-term volatility.
• For shorter horizons (under 5 years) or retirees living on euro income, hedging can reduce one source of volatility.

For most long-term European investors, the common approach is to accept the USD exposure as part of investing in global equities, since the underlying companies earn revenue worldwide. Either way, it is a decision worth making consciously.

Which index should you choose?

There’s no objectively better index: the right choice depends on your horizon, your view on US outperformance and your tolerance for concentration.

Choose the S&P 500 if

• You believe US large caps will keep outperforming global equities over your horizon.
• You want the lowest costs: the cheapest S&P 500 ETFs charge from 0.03% a year.
• You are comfortable with concentration in US mega-cap tech and understand it is effectively a bet on a small group of companies.
• You hold other ETFs for diversification, such as European, emerging market or factor ETFs.

Choose the MSCI World if

• You want a single ETF for all developed markets, with geographic diversification built in.
• You want significant US exposure but not 100%: the MSCI World is 72% US.
• You want exposure to Japan, the UK, Canada and Europe without buying separate regional ETFs.
• You invest for the very long term: over 20 to 30 years, leadership between markets can change, and the MSCI World adjusts automatically.
• You prefer not to make country bets.

Consider alternatives if

• You want truly global exposure, including emerging markets: MSCI ACWI ETFs (such as SSAC) or FTSE All-World ETFs (such as VWRA).
• You are worried about mega-cap concentration: equal-weight S&P 500 ETFs (XDEW, SPEX) or factor ETFs.
• You want to reduce US exposure on purpose: MSCI World ex USA, MSCI Europe or MSCI Japan ETFs.

The “own both” question

Some investors hold both S&P 500 and MSCI World ETFs without realising they are doubling up on the same US mega-caps. With 72% of the MSCI World already in US stocks, largely the same companies, owning both adds little diversification and complicates your portfolio.

A more sensible combination is usually an MSCI World (or ACWI) ETF as the core, plus an emerging markets ETF and, if you like, a small-cap or factor tilt.

Availability of ETFs

You cannot buy an index directly: you need a fund that tracks it, such as an exchange-traded fund (ETF) or an index fund.

S&P 500

The S&P 500 is tracked by an almost endless list of ETFs worldwide, so here is a selection of the most relevant UCITS ETFs for European investors:

A few notes on S&P 500 ETFs:

• Costs are extremely low: from 0.03% (SPDR SPY5) and 0.05% (Invesco SPXS), one of the most competitive segments of the ETF market.
• Physical vs synthetic: physical ETFs hold the underlying stocks and are more transparent. Synthetic ETFs use swaps and can track US equities slightly better thanks to the tax treatment of US dividends, but they add counterparty risk.
• Accumulating vs distributing: accumulating ETFs (CSSPX, SPXS, XSPX) reinvest dividends automatically, while distributing ETFs (VUSA, SPY5) pay them out. The choice depends on whether you want income and on how your country taxes each type.

MSCI World

There are fewer MSCI World ETFs than S&P 500 ETFs, but still plenty of choice, mainly listed on Xetra, Euronext Amsterdam, Borsa Italiana and the London Stock Exchange:

Key points on MSCI World ETFs:

• Competition has lowered costs: TERs start at 0.10% (UBS WRDA) and 0.12% (SPDR SWRD), well below the most popular option, iShares SWDA, at 0.20%.
• The iShares premium: SWDA is by far the largest and most traded MSCI World ETF, with the tightest bid-ask spreads. The TER difference versus WRDA is about €10 a year per €10,000 invested: meaningful over decades, modest in absolute terms.
• Distributing vs accumulating: the older iShares IWRD (0.50%) is a legacy fund that makes little sense for new investments when SWDA (accumulating) or HMWD (distributing) offer the same exposure for less.
• Synthetic alternative: Invesco’s SMSWLD uses swaps, which can slightly improve tracking on US dividends, but most European investors prefer physical replication.

Best brokers to invest in S&P 500 and MSCI World ETFs

Once you know which ETF you want, the next step is choosing a broker. We looked at ETF selection, fees, minimum deposits and supported currencies, and shortlisted five European brokers:

• eToro: best for social trading and commission-free ETF investing. Listed on Nasdaq (ticker ETOR) since May 2025.
• Interactive Brokers: best for the widest ETF offering and global market access, with 160+ markets. Listed on Nasdaq and part of the S&P 500 since 2025.
• DEGIRO: best for low-cost ETF investing, with no commission on its Core Selection of ETFs (a €1 handling fee applies). Part of flatexDEGIRO Bank SE.
• Trading 212: best for commission-free stock and ETF investing, with Pies, AutoInvest and fractional shares for regular investors.
• Freedom24: best for access to a very wide ETF and bond universe. Part of Nasdaq-listed Freedom Holding Corp (FRHC).

Conclusion

The S&P 500 and the MSCI World are more alike than their names suggest: 72% of the MSCI World is US stocks, and both share exactly the same top 10 holdings. The S&P 500 is cheaper and has done better over the past decade, but it is a concentrated bet on the US and on a small group of tech giants. The MSCI World costs a little more and has lagged over ten years, but it adds Japan, Europe, Canada and other developed markets, and it adjusts automatically if US leadership fades.

If you want one simple, broadly diversified core holding, the MSCI World (or an all-world index that adds emerging markets) is the more balanced choice. If you are comfortable with US concentration and want the lowest cost, the S&P 500 remains a strong option. What rarely makes sense is holding both.