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

Ahlstrom Corporation STOCK EXCHANGE RELEASE 30.9.2010 at 10.40

Ahlstrom Corporation has received an announcement from Vilha Intressenter Ab, dated September 30, 2010, regarding a change in the shareholding of said shareholder.

According to the announcement, Vilha Intressenter's shareholding in Ahlstrom Corporation has on September 29, 2010, fallen below 5 % (1/20) of the share capital and voting rights of Ahlstrom Corporation. Vilha Intressenter now owns 2,333,249 shares of Ahlstrom Corporation, which represent 4.999% 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.

For further information, please contact:
Seppo Parvi
Tel. +358 10 888 4768

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Ahlstrom in brief
Ahlstrom is a global leader in the development, manufacture and marketing of high performance nonwovens and specialty papers. Ahlstrom´s products are used in a large variety of everyday applications, 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 5,800 employees serve customers via sales offices and production facilities in more than 20 countries on six continents. In 2009, Ahlstrom's net sales amounted to EUR 1.6 billion. Ahlstrom's share is quoted on the NASDAQ OMX Helsinki. The company website is at www.ahlstrom.com.