June 13, 2005 Mitsubishi Rayon Co., Ltd. Notice Regarding Acquisition of Company Shares (In accordance with the stipulations of Article 211-3, Clause 1, Item 2 of the Commercial Code) On May 10, 2005 the Board of Directors passed a resolution to acquire the Company’s own shares in accordance with the stipulations mentioned above. The shares have been acquired accordingly, and we herewith report the details of the acquisition. Details of Acquisition 1. Period of purchase: May 13, 2005 to June 10, 2005 (on a transaction date basis) 2. Total number of shares purchased: 11,389,000 3. Total acquisition cost: ¥4,899,962,000 4. Method of purchase: purchased in ordinary trading on the Tokyo Stock Exchange For your information: The resolution of the Board of Directors of May 10, 2005 authorized the purchase of the Company’s own shares under the following conditions. 1. Type of shares to be purchased: ordinary shares 2. Maximum number of shares authorized for purchase: 12,000,000 (1.96% of shares issued and outstanding) 3. Maximum amount for use in share purchase: 4,900,000,000 Japanese Yen 4. Period of purchase: May 13, 2005 to June 7, 2005 For further inquiries, please contact: Public and Investor Relations Office e-mail: koho@mrc.co.jp [PAGE TOP]