Rottneros — Regulatory Filings 2012

May 23, 2012

PRESS RELEASE

Rottneros AB (publ) Box 70 370, SE-107 24 Stockholm, Sweden Tel +46 8 590 010 00 www.rottneros.com

Rottneros disposes of Rockhammars Bruk AB

Rottneros has sold Rockhammars Bruk AB, which owns the property where sawmill operations were previously conducted. The purchaser is NA Sverige AB, which intends to run a recycling operation at the site. The book value has been zero since the pulp mill at Rockhammar was disposed of in 2009, and the sale has resulted in a small positive effect on the result and cash flow.

Rottneros AB sold the pulp mill at Rockhammar to Korsnäs in 2009 through an asset sale. No operation has been run at Rockhammars Bruk AB since then besides the leasing of timber storage areas and also the management of land and buildings within the area of the sawmill, which was shut down in 2005. The new owner intends to run an industrial operation within the recycling sector at the saw mill property.

An adjacent forestry property, which does not form part of the transfer, also comprises areas that are ideal for the storage of timber and the like. The intention is to dispose of this property as well.

For further information please contact: Ole Terland, CEO and President, +46 8 590 010 00

Rottneros discloses the information provided herein pursuant to the Securities Markets Act and/or the Financial Instruments Trading Act. The Information was submitted for publication on Wednesday, 23 May 2012 at 10.30 CET.

Rottneros is an independent producer of market pulp. The Group comprises the parent company Rottneros AB, listed on NASDAQ OMX Stockholm, and its subsidiaries Rottneros Bruk AB and Vallviks Bruk AB with operations involving the production and sale of market pulp. The Group also includes the wood procurement company Rottneros Baltic SIA in Latvia. The Group has around 298 employees and had a turnover of approximately SEK 1.5 billion in the 2011 financial year.