AHLSTROM-MUNKSJÖ   OYJ: SHARE REPURCHASE 18.5.2017

Ahlstrom-Munksjö   Oyj ANNOUNCEMENT 18.5.2017 AHLSTROM-MUNKSJÖ   OYJ: SHARE REPURCHASE 18.5.2017 In the Helsinki Stock   Exchange Trade date          18.5.2017 Bourse trade        Buy Share                  AM1 Amount            12 000 Shares Average price/ share    17,8570 EUR Total cost            214 284,00 EUR Ahlstrom-Munksjö   Oyj now holds a total of 173 729 shares including   the shares repurchased on 18.5.2017 On behalf of Ahlstrom-Munksjö   Oyj Nordea   Bank AB (publ), Finnish Branch Janne Sarvikivi          Julius Summanen For   more information, please contact: Juho   Erkheikki, Investor & Media Relations Manager, Ahlstrom-Munksjö Oyj juho.erkheikki@ahlstrom-munksjo.com tel. +358 50 413 45 83 www.ahlstrom-munksjo.com