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

Ahlstrom Corporation STOCK EXCHANGE RELEASE June 27, 2013 at 17.50

Pursuant to Chapter 2, Section 9 of the Securities Market Act, Ahlstrom Corporation has received an announcement from Antti Ahlström Perilliset Oy, dated June 27, 2013, regarding a change in the shareholding of the said shareholder.

According to the announcement, Antti Ahlström Perilliset Oy has on June 27, 2013 signed a demerger plan relating to the company. On the expected registration date of the demerger, December 30, 2013, the 4,674,802 shares in Ahlstrom Corporation owned by Antti Ahlström Perilliset Oy, representing a total of 10.02% of the share capital and voting rights in Ahlstrom Corporation, will be transferred to Ahlström Capital Oy. According to the announcement, the shareholding of Antti Ahlström Perilliset Oy in Ahlstrom Corporation will on the date of the demerger fall below 10% (1/10) and below 5% (1/20).

Ahlstrom Corporation's share capital consists of 46,670,608 shares, each entitling to one vote.

For more information, please contact:
Liisa Nyyssönen
Vice President, Communications
Tel. +358 10 888 4757

Ahlstrom in brief
Ahlstrom is a high performance fiber-based materials company, partnering with leading businesses around the world to help them stay ahead. Our products are used in a large variety of everyday applications, such as filters, medical gowns and drapes, diagnostics, wallcoverings, flooring and food packaging. We have a leading market position in the businesses in which we operate. In 2012, Ahlstrom's net sales from the continuing operations (excluding Label and Processing business) amounted to EUR 1 billion. Our 3,800 employees serve customers in 28 countries on six continents. Ahlstrom's share is quoted on the NASDAQ OMX Helsinki. More information available at www.ahlstrom.com.

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