Index Weight Explained
A constituent's weight estimates its share of the index's weighted market value under that index's methodology.
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Understanding a Stock Card
A stock card brings a symbol's price action and index context together. Read its ticker, change, available quote fields, reference weight, estimated contribution, and small chart as distinct pieces of information.
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Start with the symbol and price
A ticker identifies a security, not necessarily a unique company; Alphabet's GOOG and GOOGL are two share classes. The displayed last price can differ from bid and ask, and from another platform using a different feed or session.
Read influence separately
The card's Index weight comes from IVV holdings; Pts/$1 estimates S&P points for a hypothetical one-dollar stock move; SP500 shows that stock's estimated S&P point effect. These are different units. The app follows the S&P 500 basket only.
Use the chart as context
The mini-chart shows that stock's move against its previous close. Click the ticker, or focus it and press Enter or Space, to open a native stock chart. Confirm the final release layout before relying on a screenshot.
Sources and further reading
- S&P DJI Index Mathematics MethodologyOfficial index calculation and divisor reference
- Alpaca Latest QuotesBid and ask quote fields and feed selection