Ahlstrom Corporation STOCK EXCHANGE ANNOUNCEMENT 26.3.2007 A total of 72,858 new shares of Ahlstrom Corporation have been subscribed with option rights under the company's stock option programs I (2001) and II (2001). A corresponding increase of EUR 109,287 in Ahlstrom's share capital has been entered in the Trade Register today. After the increase, the total number of Ahlstrom Corporation shares is 46,607,997 and the share capital amounts to EUR 69,911,995.50. The shares will be traded on the Helsinki Stock Exchange as old shares as of March 27, 2007. Ahlstrom Corporation Gustav Adlercreutz, Senior Vice President, Administration and General Counsel Distribution: Helsinki Stock Exchange Main media www.ahlstrom.com For further information, please contact: Gustav Adlercreutz, Ahlstrom Corporation, tel +358 10 888 4727. 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, e.g. in filters, wipes, flooring, labels, and tapes. The company has a strong market position in several business areas in which it operates, built upon the company's unique fiber expertise and innovative approach. Ahlstrom's 5,700 employees serve customers via sales offices and production facilities in more than 20 countries on six continents. In 2006, Ahlstrom's net sales amounted to EUR 1.6 billion. Ahlstrom's share is listed on the Helsinki Stock Exchange. The company website is www.ahlstrom.com.