NASDAQ OMX changes index algorithm for the OMX Copenhagen 20 Index effective March 1st, 2010

On March 1st, 2010 NASDAQ OMX will change the index algorithm used when
calculating the OMX Copenhagen 20 Index. The same algorithm is currently used
for calculating the VINX30 index and this is a step in harmonizing the index
algorithms for the indexes in the Nordic region. 

The result of the calculation will be unchanged, no new fields, columns or rows
will be added or deleted to the reports. The change only refers to the
presentation of the index in the morning weight report. 

The only effect this change has is how the price in column “Old Price” is
presented in the OMXC20 morning weight report whenever there is a corporate
action, for example a rights issue. On the ex-date, the current algorithm
displays “Old price” as the theoretical ex-rights price of the effected
constituent. The new algorithm displays the last paid price on the cum-date,
but the “Old Market Cap” is however adjusted for the rights issue through the
correction factor. 

For further information concerning this notice please contact Michael Olsson or
Erik Hågemo, telephone + 46 8 405 6296, e-mail index@nasdaqomx.com