Complete Guide to the Three Major U.S. Stock Market Indices (2024): Dow Jones, S&P 500, and NASDAQ Compared with ETF Investments
In this article, you'll learn:
What Are the Three Major U.S. Stock Market Indices?
Dow Jones Industrial Average (DJIA)
The Dow Jones Industrial Average (DJIA) is one of the oldest and most well-known stock market indices in the United States. It tracks the performance of 30 large publicly traded companies. Although “Industrial” appears in its name, over time, many other types of companies have been included. The word “Industrial” is now more of a historical legacy than an actual description. Most of the companies in the index today have little to do with traditional industry.
Standard & Poor’s 500 Index (S&P 500)
The S&P 500 Index has been tracking the U.S. stock market since 1957, covering 500 large companies that represent approximately 80% of the total market capitalization of U.S. publicly traded companies. As of January 2024, the total market cap exceeds $43 trillion. It is maintained by S&P Dow Jones Indices, and its stocks are traded on the NYSE and NASDAQ.
Compared to the Dow Jones, the S&P 500 includes more companies and industries, offering greater risk diversification and a more comprehensive reflection of the market. It uses market-cap weighting, which more accurately reflects each company’s actual market significance. There are also the S&P MidCap 400 and S&P SmallCap 600, which together form the S&P 1500 Composite Index.
The S&P 500, alongside the Dow Jones Industrial Average and the NASDAQ 100 Index, are collectively known as the three major indices — America’s most important stock market benchmarks.
NASDAQ Composite Index
The NASDAQ Composite Index (ticker: ^IXIC) covers nearly all stocks listed on the NASDAQ stock exchange. It ranks alongside the Dow Jones Industrial Average and the S&P 500 as one of the three most closely watched stock market indices in the United States. The NASDAQ Composite is heavily weighted toward information technology companies. Notably, the NASDAQ 100 Index (which includes the 100 largest non-financial companies in the NASDAQ Composite) accounts for approximately 80% of the composite index’s weight.
As a market-cap-weighted index, the NASDAQ Composite’s value is calculated by multiplying each security’s closing price by its index shares, then summing the results. This total is then divided by a divisor to reduce the magnitude, making the index value more manageable for reporting.
What Are the Differences Between the Three Major U.S. Indices?
The three major U.S. stock market indices — the Dow Jones Industrial Average (DJIA), the S&P 500, and the NASDAQ Composite — each have distinct characteristics:
Dow Jones Industrial Average (DJIA)
• Composed of 30 large blue-chip stocks representing America’s largest and most well-known companies
• Uses “price-weighted average” calculation — higher-priced stocks have greater influence on the index
• Component changes are infrequent, offering relatively stable representation
• Primarily covers information technology, healthcare, industrials, and consumer discretionary sectors
S&P 500 Index
• Includes 500 large U.S. publicly traded companies, offering much broader coverage
• Uses “market-cap-weighted average” calculation, better reflecting actual market trends
• Components are adjusted quarterly, making representation more dynamic
• Primarily covers information technology, financial, and healthcare sectors
NASDAQ Composite Index
• Includes approximately 3,000 stocks listed on the NASDAQ exchange
• Primarily features tech, biotech, and other high-tech companies
• Has the most components with the broadest coverage
• Spawned the NASDAQ 100 Index, selecting the top 100 components
How Have the Three Major U.S. Indices Performed in 2024?
| Index | Year-to-Date Performance | Key Characteristics |
|---|---|---|
| Dow Jones Industrial Average | 17.73% | Reflects 30 large blue-chip stocks, the oldest index |
| S&P 500 Index | 24.21% | Covers 500 large companies, more broadly representative |
| NASDAQ Composite | 26.16% | Tech-stock focused, reflects innovation industry dynamics |
This table shows the year-to-date performance of the three major U.S. stock indices in 2024. The NASDAQ Composite performed best with 26.16% growth, likely reflecting the strong development of tech and innovation industries. The S&P 500 followed closely at 24.21%, showing solid overall market performance. While the Dow Jones had relatively smaller gains, 17.73% growth is still impressive, indicating steady development among traditional large enterprises.
What Can the Three Major Indices Tell Us?
The three major U.S. stock indices — the DJIA, S&P 500, and NASDAQ Composite — provide crucial insights into the U.S. economy and stock market conditions. Here are several key takeaways these indices can offer:
Overall Economic Health
These three indices are widely used to assess the health of the U.S. economy. Rising indices typically indicate growing market confidence and possible economic expansion; conversely, declining indices may reflect economic slowdown or increased uncertainty. For example, the S&P 500 covers 500 large enterprises representing about 80% of total U.S. stock market capitalization, so its movements provide a relatively comprehensive picture of the overall economy.
Market Sentiment Indicator
These indices also reflect market sentiment. Investors often judge the market’s risk appetite based on index movements. For example, the NASDAQ primarily reflects the performance of tech stocks — when it rises, it may indicate growing investor confidence in the tech sector, and vice versa.
The Dow Jones is an earlier index that currently covers only 30 U.S. companies. Personally, I think its historical reference value is far lower than the S&P 500.
Industry Trend Analysis
Different indices concentrate on different industries, allowing them to reflect performance trends across sectors. For example, the Dow Jones is mainly composed of blue-chip stocks reflecting the health of traditional industries, while the NASDAQ focuses on tech stocks, better capturing the dynamics of emerging technologies and innovative industries. The S&P 500 serves as a health indicator for the top 500 companies — when large enterprises do well or poorly, it usually reflects on their entire industry. For instance, if Apple’s stock price drops significantly, related software, hardware, assembly, and manufacturing sectors won’t be doing well either.
ETFs That Track the Three Major Indices
The mature U.S. ETF market offers products from various companies tracking all three major indices. Here are some of the largest ETFs for your reference:
Dow Jones Industrial Average (DJIA)
| ETF Name | Ticker | Market Cap (USD) | Expense Ratio |
|---|---|---|---|
| SPDR Dow Jones Industrial Average ETF Trust | DIA | ~$30.86 billion | 0.16% |
| iShares Dow Jones U.S. ETF | IYY | ~$10.12 billion | 0.20% |
| Invesco Dow Jones Industrial Average Dividend ETF | DJD | ~$3.24 billion | 0.50% |
S&P 500 Index
| ETF Name | Ticker | Market Cap (USD) | Expense Ratio |
|---|---|---|---|
| SPDR S&P 500 ETF Trust | SPY | ~$400 billion | 0.09% |
| iShares Core S&P 500 ETF | IVV | ~$300 billion | 0.03% |
| Vanguard S&P 500 ETF | VOO | ~$300 billion | 0.03% |
NASDAQ Composite
| ETF Name | Ticker | Market Cap (USD) | Expense Ratio |
|---|---|---|---|
| Invesco QQQ Trust | QQQ | ~$140 billion | 0.20% |
| Fidelity Nasdaq Composite Index ETF | ONEQ | ~$6.74 billion | 0.21% |
Note that QQQ excludes financial stocks and tracks the NASDAQ 100 Index.
Info
Further Reading:
Long-Term U.S. Stock Investing: Sub-Brokerage Is Better Than Overseas Brokerages (For fee questions, please leave a message)
Affordable ETF 0050 vs. Luxury ETF VOO: Which Is Better for Long-Term Investment?
Further Reading
Lazy Da’s Conclusion
Is investing in the U.S. a good idea?
Whoever is the world’s leader right now — invest in them. The U.S. hasn’t always been the ideal investment destination; it just so happens that you and I were born in an era where America is on top.
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