Ahlstrom's announcement under Securities Markets Act (chapter 2, section 10) regarding a change in shareholding

Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 29.4.2008
Pursuant to Chapter 2, Section 9 of the Securities Market Act, Ahlstrom Corporation has received an announcement from Vilha Intressenter Ab dated April 28, 2008 regarding a change in the shareholding of said shareholder.
According to the announcement, Vilha Intressenter Ab's shareholding in Ahlstrom Corporation has on April 28, 2008 exceeded 5 % (1/20) of the share capital and voting rights of Ahlstrom Corporation. Vilha Intressenter Ab now owns 2,336,312 shares of Ahlstrom Corporation, which represent 5.01 % of the share capital and voting rights of Ahlstrom Corporation.
Ahlstrom's share capital consists of 46,670,608 shares, each entitling to one vote.
Ahlstrom Corporation
For further information, please contact:
Jaana Klinga, Director, Assistant General Counsel, tel. +358 10 888 4743
OMX Nordic Exchange Helsinki
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Ahlstrom in brief
Ahlstrom is a global leader in the development, manufacture and marketing of high performance fiber-based materials. Nonwovens and specialty papers, made by Ahlstrom, are used in a large variety of everyday products, such as filters, wipes, flooring, labels, and tapes. Based upon its unique fiber expertise and innovative approach, the company has a strong market position in several business areas in which it operates. Ahlstrom's 6,500 employees serve customers via sales offices and production facilities in more than 20 countries on six continents. In 2007, Ahlstrom's net sales amounted to EUR 1.8 billion. Ahlstrom's share is listed on the OMX Nordic Exchange Helsinki. The company website is www.ahlstrom.com.