Ahlstrom-Munksjö Oyj: Change in the holding of AC Invest Five BV and AC Invest Six BV

AHLSTROM-MUNKSJÖ OYJ, STOCK EXCHANGE RELEASE September 1, 2017 at 12:30 CEST Ahlstrom-Munksjö Oyj has today received a notification in accordance with Chapter 9, Section 5 of the Finnish Securities Markets Act from Ahlström Capital Oy on behalf of AC Invest Five BV and AC Invest Six BV. According to the notification, AC Invest Six BV has been merged into AC Invest Five BV as of August 31, 2017. Both companies are fully owned indirect subsidiaries of Ahlström Capital Oy. As a consequence, the shareholding of AC Invest Five BV in Ahlstrom-Munksjö Oyj has exceeded the threshold of 15% (from 12.68% to 18.36%). Simultaneously, the shareholding of AC Invest Six BV in Ahlstrom-Munksjö Oyj has fallen below the threshold of 5% (from 5.69% to 0.00%). No notification threshold has been crossed on the group level and Ahlström Capital’s total shareholding on the date of the notification was 18.36% on the date of the notification (through AC Invest Five BV). Ahlstrom-Munksjö’s registered total number of shares and voting rights of 96,438,573 shares and voting rights has been used as the basis of calculation of percentages for the notification. AC Invest Five BV and AC invest Six BV are 100% owned subsidiaries of Ahlstrom Capital BV and Ahlstrom Capital BV is a 100% owned subsidiary of Ahlström Capital Oy. For further information, please contact:

Juho Erkheikki, Investor and Media Relations Manager, tel. +358 50 413 45 83, juho.erkheikki@ahlstrom-munksjo.com

Ahlstrom-Munksjö in brief Ahlstrom-Munksjö is a global leader in fiber-based materials, supplying innovative and sustainable solutions to customers worldwide. Our offerings include decor paper, filter media, release liners, abrasive backings, nonwovens, electrotechnical paper, glass fiber materials, food packaging and labeling, tape, medical fiber materials and solutions for diagnostics. Combined annual net sales are about EUR 2.15 billion and we employ 6,000 people. The Ahlstrom-Munksjö share is listed on the Nasdaq Helsinki and Stockholm. The company was formed on April 1, 2017 through the merger of Ahlstrom Corporation and Munksjö Oyj. Read more at www.ahlstrom-munksjo.com.