Ahlstrom Corporation STOCK EXCHANGE RELEASE December 4, 2012 at 9.00 Ahlstrom, a global high performance fiber-based materials company, is arranging its Capital Markets Day today, December 4, in Helsinki, Finland. The event will include management presentations on Ahlstrom's strategy following the demerger of the Label and Processing business area, review on Product and Technology Development, updates on business areas as well as a review on Ahlstrom's financials. Presentation materials of the day will be available at 9.00 am (CET+1) on http://www.ahlstrom.com/investors. 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, wallcoverings, flooring, labels and food packaging. We have a leading market position in the businesses in which we operate. Our 5,200 employees serve customers in 28 countries on six continents. In 2011, Ahlstrom's pro forma net sales amounted to EUR 1 billion. The company's share is quoted on the NASDAQ OMX Helsinki. More information is available at www.ahlstrom.com. [HUG#1662320]