Sector
A broad classification of companies by the kind of business they run. There are three competing taxonomies in common use: GICS (Global Industry Classification Standard, used by S&P + MSCI -- 11 sectors), ICB (Industry Classification Benchmark, used by FTSE -- 11 sectors with different boundaries), and SIC (Standard Industrial Classification, the older US-government taxonomy still used in SEC filings). The three do NOT always agree -- a company can be Tech under GICS and Industrial under ICB. Always check which taxonomy a screen or peer-set uses.
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