Talvivaara Mining Company Plc to Join the OMX Helsinki 25 Index Beginning August 1, 2011

Helsinki - The NASDAQ OMX Group, Inc. (NASDAQ: NDAQ) announced the result of the semi-annual review of the OMX Helsinki 25 Index (NASDAQ OMX Helsinki: OMXH25). Talvivaara Mining Company Plc (TLV1V) will become a component of the OMXH25 Index prior to market open on Monday, August 1, 2011. Talvivaara Mining Company Plc will replace Tieto Oyj (TIE1V).

Talvivaara Mining is headquartered in Espoo, Finland, and has a market capitalization of approximately EUR 1.1 billion and was listed on NASDAQ OMX Helsinki in 2009. For more information about the company, go to www.talvivaara.com.

The OMX Helsinki 25 Index, launched in 1988, is the leading equity index for the Finnish equity market including the 25 most traded Blue chip companies on NASDAQ OMX Helsinki. The index is designed to track the Finnish equity market and act as underlying for financial products such as options, futures, exchange-traded funds and mutual funds.

The OMX Helsinki 25 index constituents effective August 1, 2011 are:

Cargotec Oyj
Elisa Corporation
Fortum Corporation
Kemira Oyj
Kesko Corporation B
KONE Corporation
Konecranes Plc
Metso Corporation
Neste Oil Corporation
Nokia Corporation
Nokian Tyres Plc
Nordea Bank AB FDR
Orion Corporation B
Outokumpu Oyj
Outotec Oyj
Pohjola Bank A
Rautaruukki Corporation
Sampo Plc A
Sanoma Corporation
Stora Enso Oyj R
Talvivaara Mining Company Plc
TeliaSonera AB
UPM-Kymmene Corporation
Wärtsilä Oyj
YIT Corporation


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