S&P 500 vs. Russell 1000: What’s the Difference?


S&P 500 vs. Russell 1000: An Overview

The Standard & Poor’s 500 Index (S&P 500) and the Russell 1000 Index both track stocks of publicly traded companies and are both considered large-cap stock indices, with stocks of companies valued at more than $10 billion. That said, there are some differences between the two, including how well they reflect the current market, composition, qualifications for stock inclusion in each index, and risks related to all of those factors.

Key Takeaways

  • The S&P 500 and Russell 1000 are both large-cap stock indices.
  • The S&P 500 skews slightly larger, while the Russell 1000 contains some companies in the mid-cap range.
  • The Russell 1000 is considered higher risk/higher reward.

S&P 500 vs. Russell 1000

Outside of the Dow Jones Industrial Average (DJIA), the S&P 500 is the best-known barometer for large-cap stocks in the United States. The index has been around since 1923 but assumed its present format in 1957. As the name suggests, it’s composed of 500 of the largest publicly-traded companies in the country. The index is used as the benchmark for dozens of mutual funds and exchange-traded funds (ETFs).

The Russell 1000 is a relatively newer index, having started in 1984. It is also less well-known than the S&P 500, but it represents a similarly broad stock market performance. Administered by FTSE Russell, it is a subset of the broader Russell 3000 Index, which includes 3,000 stocks accounting for more than 98% of total stock market capitalization. The largest 1,000 stocks go into the Russell 1000 Index, and the smaller 2,000 go into the more well-known Russell 2000 small-cap index.

With one index holding 500 stocks and the other holding 1,000, the composition of the two indices are clearly different. While the S&P 500 is composed primarily of large-cap stocks, the Russell 1000 collects more mid-cap stocks to fill out its portfolio composition.

The S&P 500 and Russell 1000 determine inclusion using relatively similar methodologies. To be included, both indices require that their components be defined as “U.S. companies.” They both look at factors such as where the company is headquartered, where it derives revenue, and where most of its assets are located. Stocks must also trade on either the New York Stock Exchange (NYSE) or the NASDAQ.

Stock prices change every minute of every business day. Therefore, publicly-traded company values are constantly changing, and it is up to an index’s administrators to keep up with these changes to reflect the current times. The process of changing the weighting of assets in a portfolio is called rebalancing. However, the S&P 500 and Russell 1000 change on different schedules.

The S&P 500 re-balances its portfolio on a quarterly basis, while the Russell 1000 is only re-balanced once a year at the end of the second quarter. Although it may not seem like a big issue, update frequency can affect how well mutual funds and ETFs bench-marked to the index can perform relative to the market. The slower an index re-balances, the longer it takes for it to be representative of the current market.

The Russell 1000’s mid-cap composition is shown by the median market capitalization of its stocks. As of November 2020, the S&P 500 had a $25.5 billion median market cap, compared to the Russell 1000’s $12.4 billion median market cap. This distinction is important because mid-cap stocks generally maintain a higher-risk, higher-return potential profile. Therefore, the Russell 1000 Index should be considered slightly more risky than the S&P 500.

Closed-end funds, mutual funds, ETFs, and thinly traded stocks are ineligible for inclusion in either index. The only minor difference between the indices here is that Business Development Corporations (BDCs) are eligible for the S&P 500, but not for the Russell 1000.

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