Press release
Jan 30, 2007

Sosei Announces Significant Exercise of Stock Acquisition Rights


Tokyo, Japan – 30 January 2007: Sosei Group Corporation (“Sosei”, TSE Mothers Index: 4565) a biopharmaceutical company, today announces the exercise of a number of Stock Acquisition Rights (“SARs”) issued on 22 January 2007.


1. Name of Stock Acquisition Rights: Sosei Group Corporation,

                                                           Stock Acquisition Rights

                                                           (11th Series Stock Acquisition Rights)

2. Exercise date:                                30 January 2007

3. Number of shares to be issued:    8,100 shares

                                  New shares:    8,100 shares

                            Treasury stocks:    0 shares

4. Exercise price:                              180,300 Yen

5. To be paid:                                    1,460,430,000 Yen

6. Number of unexercised Stock:     550 (Common Shares 9,900)
                      Acquisition Rights


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