Tokyo, Japan – 27 June 2006: Sosei Co. Ltd. (TSE Mothers Index: 4565) announced today the revisions to its financial forecast for the Fiscal Year ending March 2007, updating from the forecast announced on 15 May 2006.

1. Revised Financial Forecast for the Fiscal Year 2006 (1 April 2006 – 31 March 2007)

[Consolidated]                                                                                                                         (JY: Million)

                                                         Sales                      Ordinary Profit/ (Loss)               Net Income/ (Loss)
Original Forecast (A)                        250                                       (6,700)                                  (6,500)

Revised Forecast (B)                       450                                        (6,500)                                  (6,300)

Increase (Decrease) (B-A)               200                                         200                                          200

Increase (Decrease) %                    80.0                                         2.9                                           3.0

*There is no change to the non-consolidated forecast.
        
2. Reason for Revision

As Sosei R&D Ltd., Sosei’ s 100% subsidiary, will receive an upfront payment of about 200 million yen as a result of the execution of the agreement with Mundipharma International Corporation Limited (“Mundipharma” ) for the development and commercialisation of AD 923, the sales, ordinary loss and net loss in the consolidated forecast have been revised.