Tekla - Major shareholder announcements

Notification of a change in shareholding according to Securities Markets Act 2:10

Tekla Corporation       Stock Exchange Announcement   5.8.2008    at
1 p.m.

Notification of a change in shareholding according to Securities
Markets Act 2:10
Tekla Corporation has received the following notification on August
4, 2008: Threadneedle Asset Management Holdings Limited's holdings in
Tekla Corporation have crossed above the 10% threshold on August 1,
2008. According to the notification, their holdings are now in total
2,264,730 shares, which represent 10.027% of Tekla's shares and
voting rights.

According to Threadneedle's previous notification of January 15,
2008, their holdings were 5.098%.

The stock of Tekla Corporation comprises a total of 22,586,200
shares.

Tekla Corporation

Ari Kohonen, CEO

phone +358 30 661 1468, +358 50 64124
ari.kohonen (at) tekla.com

Distribution:     OMX Nordic Exchange Helsinki, Main media

Tekla is an international software product company whose model-based
software solutions make customers' core processes more effective in
building and construction, energy distribution, infrastructure
management and water supply. Tekla has customers in more than 80
countries. Tekla Group's net sales for 2007 were nearly 60 million
euros and operating result approximately 20 million euros.
International operations account for more than 80% of net sales.
Tekla Group currently employs more than 400 people, of whom
approximately 170 work outside Finland. Tekla was established in
1966, making it one of the longest operating software companies in
Finland. www.tekla.com