Tieto Oyj - Major shareholder announcements

Solidium's holding in Tieto at 10%

Tieto Corporation STOCK EXCHANGE RELEASE 28 May 2010, 9.00 am EET

Tieto Corporation has received an announcement pursuant to the Securities Market
Act regarding a change in its shareholding. Solidium Oy has announced that its
current holding in Tieto Corporation has exceeded the 10% threshold.

Target company: Tieto Corporation, Business Identity Code: 0101138-5

Date of change in holding: 27 May 2010

Portion of the shares and votes: Solidium Oy's (Business Identity Code:
2245475-9) current holding in Tieto Corporation is 7 205 918 shares, which
represents 10.0% of the shares and voting rights.

The registered number of shares of Tieto Corporation is 72 023 173, which
entitles to a total of 72 023 173 votes.



For further information, please contact

Reeta Kaukiainen, VP, Communications and Investor Relations, tel. +358
2072 68711,
+358 50 5220924, reeta.kaukiainen@tieto.com



TIETO CORPORATION





DISTRIBUTION
NASDAQ OMX Helsinki
NASDAQ OMX Stockholm
Principal Media





Tieto is an IT service company providing IT, R&D and consulting services. With
approximately 17 000 experts, we are among the leading IT service companies in
Northern Europe and the global leader in selected segments. We specialize in
areas where we have the deepest understanding of our customers' businesses and
needs. Our superior customer centricity and expertise in digital services set us
apart from our competitors.

www.tieto.com <http://www.tieto.com/>



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