New OMX Helsinki Benchmark Portfolio Selected - The New Portfolio Of The Omx Helsinki Benchmark Index Will Become Effective On December 1, 2011

The NASDAQ OMX Group, Inc. (NASDAQ:NDAQ) announces today the results of the semi-annual review of the OMX Helsinki Benchmark index, (NASDAQ OMX Helsinki: OMXHB), which will become effective with the market open on Thursday, December 1, 2011.

There will be three new additions to the index; Ahlstrom Corporation (AHL1V), Ilkka-Yhtymä Oyj 2 (ILK2S) and Lännen Tehtaat Plc (LTE1S).

Atria Plc A (ATRAV) and Digia Plc (DIG1V) will be removed from the index.

The OMXHB index is a free float-capitalization index designed to act as a transparent and liquid benchmark with low transaction costs for the investors. OMXHB includes 54 securities compared with 129 in the All share index, and shows a high correlation of 99,6% with the main market.

OMXHB is sector diversified and major sectors represented are Information Technology, Industrials, Financials and Materials. The securities must also meet other eligibility criteria including a turnover limit. The OMXHB index is evaluated on a semi-annual basis in May and November, and the new index portfolio becomes effective on the first trading day in June and December respectively.