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A capitalization-weighted (or cap-weighted) index, also called a market-value-weighted index is a stock market index whose components are weighted according to the total market value of their outstanding shares. Every day an individual stock's price changes and thereby changes a stock index's value.
Stock market indices may be categorized by their index weight methodology, or the rules on how stocks are allocated in the index, independent of its stock coverage. For example, the S&P 500 and the S&P 500 Equal Weight each cover the same group of stocks, but the S&P 500 is weighted by market capitalization, while the S&P 500 Equal Weight places equal weight on each constituent.
The S&P 500 index is a free-float weighted/capitalization-weighted index. As of September 30, 2024, the nine largest companies on the list of S&P 500 companies accounted for 34.6% of the market capitalization of the index and were, in order of highest to lowest weighting: Apple , Microsoft , Nvidia , Amazon.com , Meta Platforms , Alphabet ...
For example, if Company A had 20 million shares outstanding and a share price of $500, its market cap is as follows: $500 x 20,000,000 = $10,000,000,000 market capitalization
Until 15 years ago, capitalization-weighted index funds were the only way to invest with this passive approach. Investors playing the odds tend to invest in passively managed index funds, growing ...
S&P 500 Market Cap Weighted vs. Equal Weighted The above chart shows that large caps dominated early in the pandemic in 2020, but were taking a back seat to the rest of the market by the ...
Both the cap-weighted market portfolio and the CAPM model are inefficient. If we assume that the capitalization-weighted market portfolio is not efficient, assuming a pricing inefficiency, capitalization-weighting might be sub-optimal and the degree of sub-performance might be proportional to the degree of random noise. [3] [10] [11]
A price-weighted index is a stock market index where each constituent makes up a fraction of the index that is proportional to its component, the value would be: [1] Adjustment Factor = Index specific constant "Z" / (Number of shares of the stock * Adjusted stock market value before rebalancing)