Nasdaq vs. S&P 500: what's the difference?

How do the Nasdaq and the S&P 500 differ?

The S&P 500 and the Nasdaq-100 are two of the best-known US stock market indexes, but they do not represent the same group of companies.

The S&P 500 is often used as a broad measure of large US companies. It includes about 500 companies from many sectors, such as technology, financials, healthcare, consumer goods, industrials and energy.

Nasdaq, on the other hand, is the name of a stock exchange. When investors talk about "the Nasdaq" in the context of ETFs or indexes, they usually mean the Nasdaq-100. The Nasdaq-100 tracks about 100 large non-financial companies listed on the Nasdaq exchange, so it tends to be more concentrated in technology, innovation and growth companies.

The point is not to decide which index is "better". The point is to understand what each one measures.

S&P 500 vs. Nasdaq-100 at a glance

This table does not say that the S&P 500 is better than the Nasdaq-100, or the other way round. It only shows that the two indexes reflect different parts of the US market. The volatility row describes a typical pattern linked to sector concentration, not a rule that holds in every period.

Why do the Nasdaq and the S&P 500 appear in so many ETFs?

Once you have learned about stocks and ETFs, you will often see an index named in a fund's description.

That is because many ETFs are designed to track a specific index. For example:

• One ETF may track the S&P 500.

• Another may track the Nasdaq-100.

• Yet another may track the whole US market or a single sector.

An ETF does not pick companies at random. Many ETFs use an index as a "map" that defines the portfolio the fund aims to replicate.

Put simply: the index is the measuring stick, and an ETF is a product that can be designed to follow that stick.

If you are learning about ETFs, understanding the index behind a fund matters more than memorizing its ticker.

What is a stock market index?

A stock market index is a tool for tracking the performance of a group of stocks. Instead of watching each company separately, an index lets you follow a group of companies at once.

For example:

• If the index rises, many stocks in that group may be rising in value.

• If the index falls, many stocks in that group may be falling in value.

• If a few very large companies move sharply, they can have a bigger effect on the index when it is weighted by market capitalization (company size by market value).

An index is not a stock, and it is not an investment fund. You cannot buy "the index" directly the way you buy a share. In practice, investors usually get exposure to an index through an ETF, an index fund or another product that tracks it.

This matters for beginners: when someone says they "invest in the S&P 500" or "invest in the Nasdaq", they usually do not own the index itself. They mean a product that tracks that index. The core lesson "What is a stock market index?" covers this idea in more detail.

What is the S&P 500?

The S&P 500 is an index that tracks about 500 large US companies. These companies come from many sectors, including:

• Technology

• Financials

• Healthcare

• Consumer goods

• Industrials

• Energy

Some large technology companies may be in the S&P 500, but it is not a technology index. It can also include banks, healthcare companies, consumer businesses, industrial firms and many other groups.

That is why the S&P 500 is often used as a relatively broad view of large companies in the US market.

However, the S&P 500 is not the entire US market. It does not include every company listed in the US, and it is not simply a list of "the 500 largest companies" at any given moment. Its membership is managed according to a set of criteria and can change over time.

What is the Nasdaq?

The word "Nasdaq" can be confusing because it is used in several ways.

First and foremost, Nasdaq is the name of a US stock exchange. But when beginners hear phrases like "Nasdaq ETF", "the Nasdaq index" or "the Nasdaq is up sharply", the speaker often means the Nasdaq-100.

The Nasdaq-100 is an index that tracks about 100 large non-financial companies listed on the Nasdaq exchange. It tends to include many companies in technology, communications, online retail, software, semiconductors and other growth areas.

For example, beginners often come across names such as Apple, Microsoft, Nvidia, Amazon or Meta when reading about the Nasdaq-100. The index's membership can change over time, so these names only help you picture what the index looks like. They are not a fixed list, and they are not recommendations.

Remember: the Nasdaq-100 is not the whole Nasdaq exchange, and it is not the whole US stock market.

Where does the biggest difference lie?

Many people think the main difference is the number of companies: about 500 in one, about 100 in the other.

That is true, but it is not the most important part. The bigger difference is the mix of companies inside.

The S&P 500 usually covers a wider range of sectors. It can help beginners see many different parts of the US economy, not just technology.

The Nasdaq-100 is more concentrated. Because it excludes financial companies and includes many large Nasdaq-listed firms, it tends to reflect technology, innovation and growth companies more strongly.

You can picture it like this:

• The S&P 500 is a wider picture of large US companies.

• The Nasdaq-100 is a more focused picture of large Nasdaq-listed companies, especially in technology and growth.

Why does the Nasdaq-100 often move differently from the S&P 500?

A more concentrated index can move differently from a more diversified one.

When technology and growth companies do well, the Nasdaq-100 may rise more than the S&P 500. But when technology stocks come under pressure, the Nasdaq-100 can also fall further or swing more.

This does not mean the Nasdaq-100 is always riskier in every situation, and it does not mean the S&P 500 is always safe. Both are stock indexes, and both can fall.

The key lesson:

What is inside an index shapes how that index moves.

If an index depends more on one group of sectors, the results of that group will have a bigger effect on the whole index.

Does the Nasdaq earn more than the S&P 500?

This is a very common question, and it can easily point beginners in the wrong direction.

There have been periods when the Nasdaq-100 performed better than the S&P 500. There have also been periods when the gap narrowed or reversed.

If you look only at the last few years, it is tempting to conclude that the index that rose more in the past will be the better choice in the future. Investing does not work that simply. Past performance does not guarantee future results.

Instead of asking "Which index has risen more?", ask yourself:

• Which group of companies does this index represent?

• How concentrated is it in particular sectors?

• If technology stocks fall sharply, do I understand why my portfolio would be affected?

• Am I learning about indexes and ETFs, or chasing recent results?

These questions give you a sounder basis for learning than picking an index just because it has risen sharply over one period.

How do Nasdaq-100 ETFs and S&P 500 ETFs differ?

When an ETF tracks the S&P 500, its results are usually tied to the companies in the S&P 500, after fees, tracking differences, dividends and trading conditions.

When an ETF tracks the Nasdaq-100, its results are usually tied to the companies in the Nasdaq-100.

So the difference between an S&P 500 ETF and a Nasdaq-100 ETF comes mainly from the index each fund tracks:

• An S&P 500 ETF usually gives broader exposure to many sectors among large US companies.

• A Nasdaq-100 ETF usually gives more concentrated exposure to large Nasdaq-listed companies, especially in technology and growth.

That is why, before you look at an ETF's name, fees or ticker, it helps to understand the index underneath it first.

Common beginner mistakes

Thinking the Nasdaq is an upgraded S&P 500

The Nasdaq-100 is not a "premium" version of the S&P 500. The two indexes are built for different purposes and reflect different groups of companies.

Looking only at recent performance

An index that has risen strongly for a few years will not necessarily keep rising strongly. If you choose an index only because its recent performance looks attractive, you may be deciding based on short-term results instead of understanding what the asset is made of.

Not knowing which index an ETF tracks

Many people remember an ETF's name but do not know whether it tracks the S&P 500, the Nasdaq-100, the whole US market or a single sector. That makes it hard to understand which companies they are really exposed to.

Thinking a broader index means no risk

The S&P 500 is broader than the Nasdaq-100, but it is still a stock index and can fall when the US market falls. Diversification reduces some concentration risk, but it does not remove market risk.

Which suits you better: the Nasdaq or the S&P 500?

Tekoversity does not treat this as a question with one right answer. Instead of asking "Should I pick the Nasdaq or the S&P 500?", start with these learning questions:

• Do I understand which group of companies this index represents?

• Do I understand why the Nasdaq-100 is often linked with technology and growth?

• Do I understand why the S&P 500 is usually seen as broader?

• Can I accept that a stock index may fall in the short term?

• Am I choosing because I understand the structure, or because recent performance looks attractive?

If you cannot answer these questions yet, it is completely normal to keep learning before you invest.

Key points to remember

The Nasdaq-100 and the S&P 500 are both well-known US market indexes, but they are not the same.

The S&P 500 usually gives a broader view of large US companies. The Nasdaq-100 usually reflects large Nasdaq-listed companies more strongly, especially in technology, innovation and growth.

Neither index is always better than the other. Which one is more useful to study depends on which part of the US market you want to understand.

If you are looking into this from Vietnam, remember that products tracking US indexes are usually priced in USD, not VND. So beyond the index's own movements, you also need to understand the exchange rate, fees, taxes, custody and product structure. Investing in US stocks from Vietnam explains these in more detail.

Next step

The Nasdaq-100 and the S&P 500 measure different groups of companies, and that difference in breadth and concentration shapes how each one moves. But most people never hold an index directly. They hold a fund that tracks one. The next lesson on the main path explains what an ETF is, how it packages an index into something you can buy, and what to check inside it.

Continue the main path: What is an ETF?

Back to the core lesson: What is a stock market index?

This content is for personal finance education only and does not constitute personalized investment advice. Consider your own goals, time horizon, ability to bear losses, and financial circumstances before investing.