Why Do the Biggest Movers Differ From the Biggest Contributors?
The largest price change does not necessarily produce the largest index contribution.
Read the draftMarket Watch 360 Guides
Understanding the Five Market Tabs
The desktop reference view presents All, Down, Up, Impact, and Biggest Movers. The tabs give different ways to inspect the selected basket; they do not represent five separate market-data feeds.
Draft updated · owner review pending
Begin with All
All displays the current basket. Down and Up narrow attention to securities moving in each direction under the app's chosen reference. A tab count describes the selected securities and can differ from the number of companies when multiple share classes are present.
Compare Impact with Movers
Impact lists the stocks with the largest estimated S&P point effects; Settings → Stocks & Tabs → Biggest Impact stocks controls how many appear (default eight). Biggest Movers can rank by S&P Points, % Change, or $ Change. A large percentage mover need not have a large weighted effect.
Keep the context
Read the tab summary, Sort By choice, basket, and feed when switching. The current desktop app has one S&P 500 market basket; exact release behavior should be checked again before this guide is approved.
Sources and further reading
- S&P DJI Index Mathematics MethodologyOfficial index calculation and divisor reference
- Dow Jones Averages MethodologyOfficial Dow 30 price-weighting methodology