Disclosure notice

DISCLOSURE NOTICE Investor AB has acquired 2,573,200 shares in OM Gruppen, putting Investor AB's holding following this at 12,840,507 shares, which corresponds to 15.14 percent of the voting rights in the company and 15.14 percent of the share capital. Investor's previous holding corresponded to 12.1 percent of votes and 12.1 percent of share capital. INVESTOR AB For further information: Nils Ingvar Lundin, Managing Director Corporate Relations, +46-8-614 20 49; +46-70-514 20 49. Per Spångberg, Vice President Investor Relations, +46-8-614 20 31; +46-70-624 20 31 ------------------------------------------------------------ Please visit http://www.bit.se for further information The following files are available for download: http://www.bit.se/bitonline/1999/08/05/19990806BIT00310/bit0001.doc http://www.bit.se/bitonline/1999/08/05/19990806BIT00310/bit0002.pdf