Best US Stock Market Indices to Track
The best US stock market index to track is the S&P 500 because it offers a broad, balanced view of the largest American companies. For investors focused on technology, the Nasdaq-100 is an excellent alternative, while the Wilshire 5000 provides the most comprehensive market overview.
The Best US Stock Market Indices to Follow
Many people think you need to follow hundreds of individual stocks to understand the US stock market. This is a common myth. It's not only difficult but also inefficient. A much smarter way to get a clear picture of the market's health is by tracking a few key stock market indices. These indices act as a snapshot of a specific part of the market, making it easy to see the big picture.
An index bundles a group of stocks together and tracks their combined performance. It's like checking the average grade for a whole class instead of looking at every single student's report card. By following the right indices, you can quickly gauge market trends, measure your own portfolio's performance, and make more informed investment decisions.
Quick Picks: The Top Indices at a Glance
- Best Overall: S&P 500
- Best for Tech & Growth: Nasdaq-100
- Best for a Total Market View: Wilshire 5000 Total Market Index
How to Choose a US Market Index to Track
Not all indices are created equal. The best one for you depends on your goals and what you want to measure. Before you pick one to follow, consider these factors:
What Does it Represent?
Some indices, like the S&P 500, represent a broad slice of the market. Others are highly specialized. For example, some indices track only small companies, while others focus on specific sectors like technology, healthcare, or energy. Ask yourself: do you want a general overview or a deep dive into a particular industry?
How Are the Stocks Weighted?
Weighting determines how much influence each company has on the index's value. The two main types are:
- Market-Cap Weighted: Most indices, including the S&P 500 and Nasdaq-100, use this method. Larger companies have a bigger impact on the index's movement. If Apple's stock goes up, it moves the S&P 500 more than a smaller company in the index would.
- Price-Weighted: This is a simpler but less common method used by the Dow Jones Industrial Average. Companies with higher stock prices have more influence, regardless of the company's actual size. This can sometimes give a distorted view.
Think of an index not as something to buy, but as a ruler. You use it to measure the performance of the market or your own investments. Choosing the right ruler is the first step to accurate measurement.
The Top 5 US Stock Market Indices, Ranked
Here is our ranked list of the most useful and popular indices for tracking the American stock market.
1. The S&P 500
Why it's the best: The Standard & Poor's 500 is the gold standard. It tracks the performance of 500 of the largest publicly-traded companies in the United States. Because it covers about 80% of the entire US stock market's value, it is widely considered the best single gauge of large-cap American equities. It is broad, diversified across all major sectors, and used as a primary benchmark by professionals worldwide.
Who it's for: Everyone. If you are a beginner, the S&P 500 gives you a reliable and easy-to-understand view of the market. If you are an experienced investor, it serves as the most important benchmark to compare your portfolio against.
2. The Nasdaq-100
Why it's good: The Nasdaq-100 is all about technology and innovation. It includes the 100 largest non-financial companies listed on the Nasdaq stock exchange. This index is home to giants like Apple, Microsoft, Amazon, and Google. It has a heavy focus on high-growth sectors, making it a great indicator of market trends driven by technology.
Who it's for: Growth-oriented investors and anyone with a strong interest in the tech sector. If you want to know how the most innovative companies are performing, this is the index to watch. Be aware that its concentration in tech makes it more volatile than the S&P 500.
3. The Dow Jones Industrial Average (DJIA)
Why it's good: The Dow is the oldest and most famous index. While it only contains 30 large, well-established companies (often called "blue-chip" stocks), it holds significant historical and cultural weight. It’s the index you most often hear quoted on the evening news. It provides a simple snapshot of the health of America's most iconic corporations.
Who it's for: Those who want a quick pulse on the biggest names in American business. It's a good starting point, but its small size and price-weighted methodology mean it shouldn't be the only index you track.
4. The Russell 2000
Why it's good: While the S&P 500 and Dow focus on large companies, the Russell 2000 tracks 2,000 small-cap companies. These smaller businesses are often more sensitive to the domestic economy's health. Following the Russell 2000 gives you insight into a completely different segment of the market and can be a good indicator of economic growth.
Who it's for: Investors looking for diversification and a more complete picture of the US economy beyond large corporations. It's also for those with a higher tolerance for risk, as smaller companies tend to be more volatile.
5. The Wilshire 5000 Total Market Index
Why it's good: Want to track everything? The Wilshire 5000 is for you. Despite its name, it currently includes several thousand stocks—essentially all publicly traded companies in the US. It is the broadest of all major indices, offering the most comprehensive view of the entire American stock market, including large, mid, and small-cap stocks.
Who it's for: Investors and analysts who want the most complete and unfiltered view of the US equity market. It's the ultimate benchmark for total market performance.
Beyond the Big Five
While the five indices above are the most important, you can also track sector-specific indices. These zoom in on one part of the economy. For example, the Dow Jones US Real Estate Index tracks real estate investment trusts (REITs) and other real estate companies. The S&P 500 Utilities Sector ETF (XLU) follows companies in the utility sector.
Tracking these can be useful if you are invested in or interested in a specific industry. For most people, however, starting with the S&P 500 provides more than enough information to stay on top of the market.
Frequently Asked Questions
- What is the difference between the S&P 500 and the Dow Jones?
- The main differences are size and weighting. The S&P 500 tracks 500 large companies and is weighted by market capitalization, meaning larger companies have more impact. The Dow Jones tracks only 30 large companies and is price-weighted, meaning companies with higher stock prices have more influence, regardless of their overall size.
- Can I invest directly in a stock market index?
- You cannot invest directly in an index itself, as it is just a mathematical measurement. However, you can easily invest in funds that are designed to replicate the performance of an index. These are called index funds or exchange-traded funds (ETFs).
- Which US stock market index is best for beginners?
- The S&P 500 is widely considered the best index for beginners. It's broad, diversified, easy to understand, and represents a huge portion of the US market. It serves as an excellent benchmark for the overall health of the economy and large American companies.
- Why is the Nasdaq-100 so popular?
- The Nasdaq-100 is popular because it is heavily focused on the technology sector, which has been a major driver of market growth for decades. It includes many of the world's most innovative and well-known companies, like Apple, Amazon, and Microsoft, making it a key indicator for growth-oriented investors.