8 Benchmark Indices to Know Before Buying Global ETFs

Before You Compare ETFs, Check the Index Behind the Name

When comparing global-index ETFs, start with the underlying index's country mix, sectors, weighting method, and volatility rather than the fund's name.

When you pick an overseas ETF, the first thing to check is not the fund's name but the index it tracks. A fund with "global" or "U.S." in its title can hold very different countries, sectors, and levels of volatility depending on that index. Most of the confusion between look-alike products starts right here.

This guide picks the eight benchmarks that come up most often when comparing global-index ETFs and explains which market each one covers and how. The order starts with the main U.S. indices, then widens to developed markets, emerging markets, Japan, and Europe, so the ranking reflects a reading path more than a verdict.

How we chose

Frequently cited in global-index ETF descriptions
Different enough in country and sector mix to be worth comparing
Clear weighting method and volatility drivers we can explain

If you're new, begin with ranks 1 and 2; if regional diversification is your question, jump to ranks 5 through 8. This article is for information only, and investment decisions and their results are the investor's own responsibility.

S&P 500 Index

Tracking roughly 500 large-cap U.S. companies by market cap, the S&P 500 is the baseline most global-index ETFs are compared against. Technology carries the largest weight, but financials, healthcare, and consumer names round out the mix, giving it more diversification than a single-sector fund. It's a sensible starting yardstick for long-term exposure to large, established U.S. businesses. Just remember that it concentrates on one country.

Nasdaq 100 Index

Heavy on large technology and growth names like Apple, Microsoft, and Nvidia, the Nasdaq 100 tends to stand out when big tech is rallying. That same concentration can mean sharper drawdowns when rates rise or growth stocks correct. It's worth comparing against the S&P 500 if you want more aggressive growth exposure, and if your portfolio is already tech-heavy, check for overlapping holdings before adding more.

Dow Jones Industrial Average

Built from just 30 blue-chip companies, the Dow has long served as shorthand for the health of the U.S. market. Because it is price-weighted rather than market-cap weighted, it doesn't move in lockstep with the S&P 500. It gives a quick read on large-cap sentiment, but it isn't designed to represent the broader market. When choosing a product, keep its small number of holdings in mind.

Russell 2000 Index

As the go-to benchmark for U.S. small caps, the Russell 2000 often moves differently from large-cap tech indices. It can draw attention when hopes for an economic recovery build, but smaller companies with thinner balance sheets add to its volatility. It can add variety to a large-cap portfolio, though investors usually treat it as a supporting holding rather than a core one. Sensitivity to interest rates is worth checking too.

MSCI World Index

Spanning the U.S., Japan, Europe, and other developed markets, MSCI World offers broader geographic diversification than a single-country fund. The U.S. still carries a heavy weight within it, so it isn't an evenly balanced global mix. It also excludes emerging markets entirely, which matters if you want full global coverage. It suits anyone looking to widen exposure beyond the U.S. into other developed economies.

MSCI Emerging Markets Index

This index is a common entry point for diversified exposure to developing economies, with growth potential as the main draw. Political risk, currency swings, regulation, and commodity prices can all move returns significantly. Because any single country's weight can shift over time, look at the actual country and stock breakdown instead of relying on the label "emerging markets." Start by asking whether you can live with the volatility.

Nikkei 225 Index

One of the most-cited gauges of large Japanese companies, the Nikkei 225 is price-weighted, so it can diverge from cap-weighted measures of the Japanese market. Yen exchange rates, Bank of Japan policy, and exporter earnings all feed into its moves. When comparing Japan ETFs, watch currency, policy conditions, and hedging along with the index itself. It fits investors who want to carve out a dedicated Japan allocation.

EURO STOXX 50 Index

Made up of 50 large eurozone companies, this index frequently comes up when comparing European equity ETFs. It can add regional diversification to a U.S.-heavy portfolio, but it is sensitive to European growth, energy prices, interest rates, and the euro's exchange rate. With so few constituents, it is also more concentrated than broader European market indices. Companies outside the eurozone, such as those in the U.K., may not be included.

How to choose

If you want a base for U.S. exposure, rank 1, the S&P 500, is the starting point. For a heavier growth tilt, compare rank 2, the Nasdaq 100, but first check how much technology you already hold. Rank 5, MSCI World, widens the view to developed markets, and rank 6, MSCI Emerging Markets, to developing ones.

Once you've settled on an index, compare the products themselves: total expense ratio, tracking difference, currency hedging, fund size, and how distributions are paid. Two funds on the same index can end up with different results because of these terms. All of this reflects the research date and may change, so check the prospectus and your financial institution's official channels before investing.

Frequently asked questions

Do global-index ETFs tracking the same index deliver identical returns?

Not necessarily. Even funds tracking the same benchmark can differ in fees, currency hedging, and tracking error. Compare the prospectus and net asset value history before assuming two products perform the same.

Is the Nasdaq 100 or the S&P 500 the safer choice?

Neither can be called inherently safer. The Nasdaq 100's heavier tech weighting tends to add volatility, while the S&P 500 spreads exposure across more sectors. Review the prospectus and weigh your own risk tolerance before deciding.

Why are emerging-market ETFs typically more volatile?

Political risk, currency moves, regulatory shifts, and commodity prices all play a bigger role. Country weightings can also shift over time, so check the actual composition rather than assuming stable diversification.

Does MSCI World include emerging markets?

No. MSCI World covers developed markets such as the U.S., Japan, and Europe only. If you want exposure that includes emerging economies, you need to check an emerging-markets index separately.

How is the Dow Jones different from the S&P 500?

The Dow is a price-weighted index of 30 large companies, while the S&P 500 is a market-cap-weighted index of about 500. Their moves are not identical, and the S&P 500 covers the broader market.

Do Japan or Europe ETFs require watching exchange rates?

Yes. The yen or euro exchange rate can affect results in won terms. Hedging differs from product to product, so check how a given fund handles currency in its prospectus.

NEWSLETTER

Get new lists before anyone else

Once a week — only the new lists worth your time.

No spam · unsubscribe in one click

This page contains affiliate links. We may earn a commission from qualifying purchases.

How we chose

S&P 500 IndexUpvote

Nasdaq 100 IndexUpvote

Dow Jones Industrial AverageUpvote

Russell 2000 IndexUpvote

MSCI World IndexUpvote

MSCI Emerging Markets IndexUpvote

Nikkei 225 IndexUpvote

EURO STOXX 50 IndexUpvote