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Investopedia explains 'Sector Breakdown'
Sectors are a broader classification than industries, although some companies (especially more modern ones) can make a case for being "counted" in several different sectors. Companies within the same sector tend to have relatively high correlations in their rate of revenue and earnings growth, stock price performance, and earnings forecasts - especially over short- and medium-term time periods.
A diversified stock portfolio should hold stocks across most, if not all, sectors. Market weightings of sectors can be found by looking at the composition of a broad index like the S&P 500.
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