Release no. 3 - 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 4 March 2010 Major shareholder announcement from Rockwool Foundation With reference to company announcement 6/2009 of 5 May 2009 regarding the offer from the Rockwool Foundation to exchange other shareholders' A shares for Rockwool Foundation B shares for up to 600,000 B shares Rockwool International A/S hereby announces pursuant to Section 29 of the Danish Securities Trading Act that it has received information that the Rockwool Foundation's holding of shares in Rockwool International A/S after multiple exchanges totals 4,712,642 A-shares of DKK 10 nominal value and 309,410 B-shares of DKK 10 nominal value equivalent to a total of 22.85 % of the share capital and a total of 33.97 % of the voting rights. Further information: Group Legal Affairs Rockwool International A/S +45 46 56 03 00