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

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

Helsinki, July 13, 2011 — The NASDAQ OMX Group, Inc. (NASDAQ:NDAQ) announced
today 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. 

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