New OMX Helsinki Benchmark Portfolio Selected - The New Portfolio Of The OMX Helsinki Benchmark Index Will Become Effective On June 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 Wednesday, June 1, 2011.

There will be no additions to the index.

Technopolis Plc (TPS1V) 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 132 in the All share index, and shows a high correlation of 99,6% with the main market.

During the selection process the OMXHB is sector diversified. Major sectors 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.

OMX Helsinki Benchmark constituents after review effective June 1, 2011: