Definition
A group of companies in the same broad line of business, such as technology, energy or health care.
The story
The S&P 500's companies are sorted into 11 sectors. Sectors often react differently to the same news: higher oil prices can lift energy stocks while hurting airlines. That's why coverage says things like "tech led the gains."
Why markets watch it
Sector moves show which parts of the market are driving the day.
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Last seen in
We explain why it moves markets. What you do with it is your call. Commentary and education only. Not financial advice. All terms