Investor AB

Transaction in Own Shares • Apr 23, 2008

Press Release

Stockholm, April 23, 2008

Utilization of authorization within Investor AB to repurchase own shares to hedge the company's long-term share-based remuneration program for employees and synthetic shares as part of board remuneration

The 2008 Annual General Meeting of Investor AB approved the proposal to authorize the company's Board of Directors to decide on the purchase of the company's own shares for the purpose of hedging Investor's commitments and costs in connection with its 2008 long-term sharebased remuneration program for employees and the issue of synthetic shares as part of board remuneration. Investor hereby announces that the company's board has decided to utilize the authorization for this purpose.

The shares will be purchased on the Stockholm Stock Exchange (Stockholmsbörsen) before May 15, 2008 at a price within the registered share price interval on each occasion.

Investor currently owns 1,400,000 of its own B-shares and intends to buy back an additional 1,400,000 B-shares.

INVESTOR AB

For further information:

Fredrik Lindgren, Vice President, Corporate Communications, Phone +46 8 614 20 31, +46 735 24 2031

Oscar Stege Unger, Vice President, Investor Relations, Phone +46 8 614 20 59, +46 70 624 2059

Our press releases can be accessed at www.investorab.com on the Internet.

Investor AB is the largest industrial holding company in the Nordic region. For almost a century, Investor's business concept has been to generate solid long-term returns by investing in companies with attractive potential for value creation. We are an active owner who applies our experience, knowledge and network to develop both listed and unlisted holdings and make them best-in-class. Investor conducts investment activities from Northern Europe, the United States and Asia.