Ahlstrom Corporation STOCK EXCHANGE RELEASE September 11, 2014 at 12.50 p.m. Not for release, publication or distribution, directly or indirectly, in or into the United States, Canada, Australia, Hong Kong, South Africa, Singapore or Japan or any other jurisdiction in which the distribution or release would be unlawful. Ahlstrom reopens voluntary tender offer Capitalized terms used but not defined in this announcement have the meanings given to them in the Tender Offer Memorandum dated September 1, 2014. Ahlstrom Corporation has made a voluntary Tender Offer to the holders of its outstanding EUR 100,000,000 Notes due 2015. The original Offer Period expired at 4.00 p.m. EET on September 10, 2014. In accordance with the Terms and Conditions of the Tender Offer, Ahlstrom Corporation has resolved to re-open the Offer Period so that the new Offer Period expires at 4.00 p.m. EET on September 16, 2014. The Purchase Price offered for all Noteholders will be increased so that the new Purchase Spread is 66 bps (instead of the earlier 100 bps). Ahlstrom Corporation confirms that the New Issue Condition has been satisfied and accepts to buy all the notes offered for purchase by the Noteholders. The final acceptance amount will be announced after the elapse of the new Offer Period. Pricing of the Tender Offer is estimated to take place on September 17, 2014 and the settlement of the trades is expected to occur on September 19, 2014. For more information, please contact: Sakari Ahdekivi CFO Tel. +358 10 888 4768 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. We aim to grow with a product offering for clean and healthy environment. Our materials are used in everyday applications such as filters, medical fabrics, life science and diagnostics, wallcoverings and food packaging. In 2013, Ahlstrom's net sales from the continuing operations amounted to EUR 1 billion. Our 3,500 employees serve customers in 24 countries. Ahlstrom's share is quoted on the NASDAQ OMX Helsinki. More information available at www.ahlstrom.com. Disclaimer This release is for informational purposes only and is not to be construed as an offer to purchase or sell or a solicitation of an offer to purchase or sell with respect to any bonds. The distribution of this release and the related material concerning the issuance of the new bond and the invitation to tender the outstanding bond are prohibited by law in certain countries. The new bonds are not being offered and the tender offer for the outstanding bonds is not made to the public either inside or outside of Finland. Persons resident outside of Finland may receive this release and the related bond documentation only in compliance with applicable exemptions or restrictions. Persons into whose possession this release and the related bond documentation may come are required to inform themselves about and comply with such restrictions. This release and the related bond documentation may not be distributed or published in any country or jurisdiction if to do so would constitute a violation of the relevant laws of such jurisdiction or would require actions under the laws of a state or jurisdiction other than Finland, including the United States, Australia, Canada, Hong Kong, South Africa, Singapore and Japan. The information contained herein shall not constitute an offer to sell or tender, or a solicitation of an offer to buy or sell the Issuer's bonds to any persons in any jurisdiction in which such offer, solicitation or sale or tender would be unlawful. Ahlstrom's representatives assume no legal responsibility for such violations, regardless of whether the parties contemplating investing in or divesting the Issuer's bonds are aware of these restrictions or not. Ahlstrom's bonds have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), nor under any securities legislation of any state in the United States, and they may not be offered, sold, resold, delivered, distributed, bought or transferred in the United States or to U.S. persons or on behalf of U.S. persons, except pursuant to an exemption from the registration requirements of the Securities Act and any securities legislation of any state in the United States. [HUG#1855299]