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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 Russell 3000 Index is a capitalization-weighted stock market index that seeks to be a benchmark of the entire U.S. stock market.It measures the performance of the 3,000 largest publicly held companies incorporated in America as measured by total market capitalization, and represents approximately 97% of the American public equity market.
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
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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]
The Nasdaq-100, which includes 100 of the largest non-financial companies in the Nasdaq Composite, accounts for about 80% of the index weighting of the Nasdaq Composite. [ 1 ] The Nasdaq Composite is a capitalization-weighted index ; its price is calculated by taking the sum of the products of closing price and index share of all of the ...
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)