New date for Investor AB's Year-End Report for 2003

Financial reporting dates in 2004 New date for Investor AB's Year-End Report for 2003 Please note that Investor AB's Year-End Report for 2003 will be released on January 20, 2004 instead of the previously reported date of January 22. Financial Reports in 2004 Due to accounting regulations, Investor's associated companies are to be reported in accordance with the equity method in the consolidated income statement and balance sheet as of 2004. As a consequence, Investor must wait for the interim reports of associated companies before it can prepare its own formal interim report. However, for the purpose of providing financial information to the market as quickly as possible, Investor will first prepare a net asset value report based on the acquisition value method and then release its formal interim report at a later date. Press and analyst meetings will be held in conjunction with net asset value reports but not in conjunction with the release of the formal interim reports. Net Asset Value Reports Formal Interim Reports January - March 2004 April 19 May 28 January - June 2004 July 12 August 27 January - September October 12 November 26 2004 INVESTOR AB For further information: Fredrik Lindgren, Vice President, Corporate Communications, +46 8 614 2031, +46 70 624 2031 ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2003/12/01/20031201BIT00560/wkr0001.doc http://www.waymaker.net/bitonline/2003/12/01/20031201BIT00560/wkr0002.pdf

About Us

Investor is the leading owner of Nordic-based international companies, founded by the Wallenberg family a hundred years ago. We own significant minority or majority interests in high quality companies. Through our participation on the boards of directors, we work for continuous improvement of the performance of the companies. With our industrial experience, network and financial strength we strive to make our companies best-in-class. Our cash flow allows us to support strategic initiatives in our companies, capture investment opportunities and provide our shareholders with a dividend. Our Core Investments include listed holdings Atlas Copco, SEB, ABB, Ericsson and the operating subsidiary Mölnlycke Health Care.

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