Irish Stock Exchange to change index weighting calculations

The Irish Stock Exchange (ISE) is to change the way it calculates its benchmark Iseq index to reduce the weighting of companies whose shares suffer from lower liquidity.

17th February, 2007

The exchange will move to the so-called ‘free float’ basis for calculating the importance of individual stocks when compiling the Iseq at the end of June, bringing it into line with most international indices.

The free float calculation cuts the weighting of companies that feature major shareholders whose investments are considered to be strategic or long term in nature. Companies whose Iseq weightings will suffer include Aer Lingus, Independent News & Media, Kerry...

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