Hedging of long-term incentive program for 2006 through purchase of own shares in Investor AB

Investor AB (”Investor”) hereby reports that the company purchased 350,000 B-shares in Investor on May 23, 2006 at a price of SEK 126.50 per share in order to hedge the long-tem incentive program approved by the Annual General Meeting for 2006. The 350,000 B-shares that were repurchased comprise Investor’s entire holding of own shares. The total number of shares in Investor amount to 767,175,030, of which 311,690,844 are class A shares and 455,484,186 class B shares. INVESTOR AB For further information: Fredrik Lindgren, Vice President, Corporate Communications: +46 8 614 20 31, +46 735 24 20 31 Oscar Stege Unger, Investor Relations Manager, +46 8 614 20 59, +46 70 624 20 59