Nasdaq Composite Versus Nasdaq-100: Why the Names Matter
Two familiar technology-heavy benchmarks have different membership rules and can behave differently.
Nasdaq's own methodology describes the Nasdaq Composite as a capitalization-weighted gauge of thousands of companies listed on the Nasdaq exchange. The Nasdaq-100 is a narrower selection and has its own eligibility and rebalancing rules. Calling both simply 'the Nasdaq' conceals differences relevant to a headline about technology stocks.
Constituent selection changes exposure to smaller listings, finance companies and concentrated megacap groups. Index values also have different baselines, so their point changes cannot be compared directly. Percentage returns over matching dates are more informative than comparing the number of points gained or lost.
Before interpreting a market report, identify its exact index, ticker, price-return or total-return treatment, and timestamp. Examine the leading constituents rather than assuming every listed technology company participated. A benchmark is an analytical tool, not a tradeable security by itself.
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