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This is the formula that was used for the old Financial Times stock market index (the predecessor of the FTSE 100 Index). It was inadequate for that purpose. In particular, if the price of any of the constituents were to fall to zero, the whole index would fall to zero.
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
Market cap is given by the formula =, where MC is the market capitalization, N is the number of common shares outstanding, and P is the market price per common share. [ 8 ] For example, if a company has 4 million common shares outstanding and the closing price per share is $20, its market capitalization is then $80 million.
A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time.
Adjustment Factor = Index specific constant "Z" / (Number of shares of the stock * Adjusted stock market value before rebalancing) A stock trading at $100 will thus be making up 10 times more of the total index compared to a stock trading at $10. The Dow Jones Industrial Average and Nikkei 225 are examples of price-weighted stock market indexes.
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.
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.
The PSI-20 is a capitalization-weighted index. The market capitalisation used to calculate the weightings of each stock is the so-called free-float band adjusted market cap, where the free float factor (fraction of shares actively available for trade on Euronext Lisbon) is rounded up to the nearest 5%. [12]