Investor AB

Delisting Announcement • May 18, 2010

Press Release

Stockholm, May 18, 2010

Investor Growth Capital writes off its 13 percent holding in Japan based FOI Corp.

Following an announcement from the Tokyo Stock Exchange that FOI Corp, a semiconductor manufacturing equipment company, will be delisted as of June 19, 2010, Investor has decided to write down the value of its 13 percent holding in the company from SEK 226 m. to zero.

FOI is being investigated on suspicion of violating the Financial Instruments and Exchange Law by overstating its sales before going public in November 2009.

Investor Growth Capital will monitor the development and the investigation closely in order to be able to take appropriate actions going forward.

For further information:

Oscar Stege Unger, Head of Corporate Communications, Phone +46 8 614 2059, +46 70 624 2059

Magnus Dalhammar, Investor Relations Manager, Phone +46 8 614 2130, +46 735 24 2130

Our press releases can be accessed at www.investorab.com

Investor AB is a Nordic-based industrial holding company founded almost one hundred years ago by the Wallenberg family. Today we have investment activities in Europe, the United States and Asia. The business concept is to generate attractive long-term returns for our shareholders by owning and developing companies with solid potential for value creation. We are an engaged owner and apply experience, knowledge and a unique network to develop listed and unlisted companies to make them best-in-class.