2007 2006 2005 12/11/2006 Announcement Regarding Determination of Issue Price and Selling Price,Etc 11/29/2006 Announcement Regarding Issuance and Sale of New Shares and Stock Split 11/22/2006 Brief Statement of Consolidated Financial Results for and at the End of the 3rd Quarter of FY2006 10/12/2006 Announcement of Result of Tender Offer and Notice of Change in Subsidiary 10/10/2006 SUMCO to build new 300mm crystal growing facility 09/12/2006 Brief Statement of Consolidated Financial Results for the six months ended July 31,2006 of Fiscal Year 2006 09/12/2006 Notice of Dissolution and Liquidation of Our Subsidiary 09/12/2006 Announcement of Revisions to Business Forecasts 09/12/2006 Announcement of Commencement of Tender Offer 07/31/2006 Announcement of Revisions to Dividend Forecast 07/31/2006 Announcement of Revisions to Business Forecasts 07/28/2006 Brief Statement of Consolidated Financial Results for and at the End of the 1st Quarter of FY2006 06/14/2006 SUMCO released Basic Agreement with respect to Share Transfer. 05/12/2006 SUMCO Announced the Signing of New Plant Site Agreement with Saga Prefecture 03/10/2006 SUMCO Recieves Favorable Ruling Against MEMC ELECTRONIC MATERIALS, INC. In a Patent Lawsuit Involving Low Defect Silicon Wafers 03/02/2006 SUMCO Raises Dividend Projection 01/30/2006 Notification of Revisions to Business Forecasts

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