PortWhat Is a Stock Market Index?
An indicator showing the change in value of a basket of companies representing the market or a part of it.
Explanation
An index is not an instrument that can be bought—it is a measure. You can buy a fund that tracks it.
The composition of an index and the weighting method of its constituent companies are very important. A market-cap-weighted index is dominated by the largest companies, so the performance of a few firms can determine the behavior of the entire index.
Example
In the WIG20, a few of the largest companies account for a greater portion of the index's changes than the other dozen or so combined.
Related Terms
See Live Stock Market Index
Portevo displays this and dozens of other metrics for specific companies, along with an earnings calendar and your portfolio.
Portevo is not an investment advisor. The data and analyses are for informational and educational purposes only and do not constitute a recommendation or an offer to buy or sell financial instruments. Quotes are from external providers and may be delayed. You make investment decisions at your own risk.
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