Release no. 2 - 2010 To NASDAQ OMX Nordic Exchange Copenhagen A/S This is a translation of the Danish version. Only the Danish version is legally binding. ROCKWOOL INTERNATIONAL A/S Hovedgaden 584, Entrance C DK�2640 Hedehusene Phone: +45 4656 0300 www.rockwool.com Danish CVR no: 54879415 Page 1/1 23 February 2010 Major shareholder announcement Rockwool International A/S Pursuant to section 29 of the Danish Act on Securities Trading we hereby announce that the major shareholder 15. Juni Fonden has informed Rockwool International A/S that it now holds less than 10 % of the share capital. Further information: Group Legal Affairs Rockwool International A/S +45 46 56 03 00