markets
What is S&P 500?
The S&P 500 tracks about 500 large U.S. companies, weighted by market value, which means the biggest companies move it the most. It is the most widely followed measure of the U.S. stock market and the index behind many retirement-plan funds.
Related terms
How it works
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Nasdaq-100 slide, oil price climb, and Eli Lilly's weight-loss pill
Fed Chair Warsh has not ruled out an October rate increase, and card balances could feel it.