Market
Statistics > Market Indices > Index Calculation Formula
The SEMDEX is an index of prices of all listed
shares and each stock is weighted according to its share in the total market
capitalisation.
Thus, changes, in the SEMDEX are dominated by changes
in the prices of shares with relatively higher market capitalisation.
In its computation, the current value of SEMDEX, is expressed in
relation to a base period, which is chosen as the 5th July 1989, with
an index value of 100.
The index formula is as follows:
SEMDEX = Current Market Value of
All Listed Shares x 100
Base Market Value of All Listed Shares
where the market value of any class of shares is equal to
the number of shares outstanding times its market price.
The base value of listed shares is adjusted to reflect new
listings, rights issues and other capital restructurings.
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