S&P 500

S&P 500
source
Name	S&P 500
Foundation	04 March 1957
Operator	S&P Dow Jones Indices
Exchanges	New York Stock Exchange, Nasdaq
Constituents	500
Cap	US$45.5 trillion (April 2024)
Website	https://www.spglobal.com/spdji/en/indices/equity/sp-500/

S&P 500. The S&P 500 is a stock market index tracking the stock performance of 500 of the largest companies listed on stock exchanges in the United States. It is one of the most commonly followed equity indices and is often used as a benchmark for the overall performance of the U.S. stock market and the American economy. The index is maintained by S&P Dow Jones Indices, a joint venture majority-owned by S&P Global.

Overview

The index is widely regarded as the best single gauge of large-cap U.S. equities, encompassing approximately 80% of the total market capitalization of the U.S. stock market. Its components are selected by a committee based on criteria including market size, liquidity, and industry representation. The performance of the index is closely monitored by investors, economists, and policymakers worldwide as a barometer of corporate America's health. Many exchange-traded funds and mutual funds, such as those offered by Vanguard Group and BlackRock, are designed to track its returns.

History

The origins of the index trace back to 1923 when Standard Statistics Company introduced a series of indices. The modern S&P 500 was introduced on March 4, 1957, by Standard & Poor's, allowing for the automated calculation of the index in real-time. Key milestones in its history include its role during the Black Monday crash and the dot-com bubble of the late 1990s. The index has undergone significant evolution, such as the inclusion of Nasdaq-listed companies in the 1970s and the shift to a free-float methodology in 2005. Major constituent changes have reflected broader economic shifts, like the rise of technology giants such as Apple and Microsoft.

Composition and methodology

Constituents are selected by the S&P Dow Jones Indices Index Committee, which considers factors like market capitalization, financial viability, and adequate liquidity. The index uses a market-capitalization weighting methodology, meaning companies with larger market values exert a greater influence on the index's movement. Sector classification follows the Global Industry Classification Standard, with significant weightings in Information technology, Health care, and Financials. Regular rebalancing occurs quarterly, and the committee can make changes at any time, such as the notable addition of Tesla to the index in 2020.

Performance and returns

Long-term historical performance has shown an average annualized total return of approximately 10% before inflation since its 1957 inception. The index has experienced major downturns during events like the 2008 financial crisis and the COVID-19 pandemic market crash, followed by strong recoveries. Its performance is often compared to other major indices like the Dow Jones Industrial Average and the Nasdaq Composite. Total returns for investors include both capital gains and dividend reinvestment, which are captured by indices like the S&P 500 Total Return Index.

Role in investing

The index serves as a primary benchmark for the performance of active fund managers, with a majority historically failing to outperform it over long periods. This observation underpins the rise of passive investing strategies. It forms the basis for a vast array of financial products, most notably exchange-traded funds like the SPDR S&P 500 ETF Trust and index funds from providers like Fidelity Investments. Furthermore, it is a key underlying asset for derivatives such as futures contracts traded on the Chicago Mercantile Exchange and options on the Chicago Board Options Exchange.

Criticism and limitations

Critics argue that its market-cap weighting creates excessive concentration risk, as top holdings like Apple and Microsoft can disproportionately drive performance. The selection process by a committee, rather than purely objective rules, has also drawn scrutiny. Some economists note it does not represent the entire U.S. economy, as it excludes thousands of smaller public and private companies. Alternatives like the Russell 3000 Index or equal-weighted versions such as the S&P 500 Equal Weight Index are sometimes proposed to address these perceived biases and limitations.

Category:Stock market indices Category:S&P Dow Jones Indices Category:1957 establishments in the United States