Capitalization-Weighted Index

Capitalization-Weighted Index

A capitalization-weighted (or cap-weighted) index, also known as a market-value-weighted index, is a stock market index in which each component is weighted in relation to the overall market capitalization of the index. The market capitalization of a firm is derived by multiplying its outstanding shares by the current share price. Consistently an individual stock’s value changes and consequently changes a stock list’s worth. The effect that individual stock’s value change has on the file is relative to the organization’s general market esteem, in a capitalization-weighted index.

Companies with a larger market capitalization have a bigger impact on the index value in a capitalization-weighted index. The market capitalization of each security is divided by the total market capitalization of all constituent securities to determine its weight. A securities exchange file estimates a subset of the financial exchange and assists financial backers with contrasting current value levels and past costs to gather data about the current market execution. Organizations with a more modest market capitalization convey less importance.

Example of Capitalization-Weighted Index

Economic indexes include stock market indices. The prices of selected equities are used to create an index using several ways (including the capitalization-weighted technique). The capitalization-weighted index is the most widely used stock market index currently. Capitalization-weighted indices, such as the S&P 500, the NASDAQ Composite, and the FTSE 100, are the largest and most well-known market indices. The following formula can be used to produce a market-capitalization weighted index value at any time.:

Market Capitalization-weighted Index = w1×p1 + w2×p2 + … + wn×pn


w1 is the weight of first stock,

p1 is the price of first stock,

w2 is the weight of second stock,

p2 is the price of second stock,

wn is the weights of nth stock and

pn is the price of nth stock and so on.

Weight of each security can be calculated as follows:

wn = Market Cap of Security n / Total Market Capitalization

wn =     qn × pn / q1 × p1 + q2 × p2 + … + qn × pn

A typical form of capitalization weighting is the free-glide weighting. With the capitalization-weighted strategy, the record parts with a higher market cap will get a higher weighting in the list. Because the values change proportionally to the price fluctuations of each component, these indexes are commonly employed (since market capitalization is determined by the stock price multiplied by the number of shares outstanding). Each component’s shareholder base is also taken into account by the indices. A float factor is applied to each stock using this method to account for the proportion of outstanding shares held by the general public versus “closely held” shares owned by the government, royalty, or corporate insiders.

Relatively, the presentation of organizations with a little market cap will an affect the exhibition of the general file. Since certain organizations own offers that are not completely accessible to general society, the greater part of the lists utilizes the free buoy factor to change computations. The free float is the percentage of a company’s stock that can be traded. Price-weighted, fundamental-weighted, and equal-weighted index construction methods are also used to calculate the value of stock market indexes.

In addition to being cap-weighted, an index that is weighted in this way is called “float-adjusted” or “float-weighted.” Capitalization-weighted indices are criticized by some investors for offering a misleading perspective of the stock market. Many accept that the essential justification the mutilation is the overweighting toward organizations with the biggest market capitalization. Market capitalization is gotten from the benefit of exceptional offers. Instead of utilizing revenue or total assets, the investment community might use market capitalization to evaluate a company’s size.

The method used to compute the price of an index can also be classed. Large swings in the price of shares for the largest index businesses can have a considerable impact on the value of the overall index in the composition of a capitalization-weighted index. In a price-weighted index like the Dow Jones Industrial Average, the cost of every segment stock is the lone thought while deciding the worth of the list. Big companies with a large number of outstanding shares, on the other hand, tend to be more stable revenue providers, thus they can help the index develop steadily.

Thus, even if the dollar shift is less large in a relatively high-value name, even a single security’s price fluctuation will have a big impact on the index’s worth. The overweighting of the largest businesses, according to critics of capitalization-weighted indexes, might lead to a misleading perspective of the market. In any case, the biggest organizations additionally have the biggest investor bases, which puts forth a defense for having a higher weighting in the file. In an in a general sense weighted list, stocks are weighted by key components like deals or book esteem.

Because the weight of any security included in the index is based on the price of the stock, a market-capitalization-weighted index weights the component stocks or bonds in proportion to their total value. Securities with higher prices are overweighted in the index, while those with lower prices are underweighted. Also, list assets and trade exchanged assets purchase extra portions of a stock as its market capitalization increments or as the offer cost increments. As such, as the stock cost is rising, these assets buy more offers at greater costs; this can be strange to the contributing mantra of purchasing low and selling high.

Information Sources:

  4. wikipedia