US500 | SPX | SP500 SHORT 3H

The S&P 500 Index is a market-capitalization-weighted index of 500 leading publicly traded companies in the U.S. The index actually has 503 components because three of them have two share classes listed.

It is not an exact list of the top 500 U.S. companies by market cap because there are other criteria that the index includes. Still, the S&P 500 index is regarded as one of the best gauges of prominent American equities' performance, and by extension, that of the stock market overall.
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