Press release
May 31, 2010

Sosei Announces a New Appointment to its Board of Directors

Tokyo – 31 May 2010 – Sosei Group Corporation (“Sosei”; TSE, Mothers Index: 4565), a biopharmaceutical company, is pleased to announce a new appointment to its Board of Directors subject to the approval of the shareholders at the Annual General Meeting on 22 June.

New Non-executive Director – Peter Bains 

Mr Peter Bains served as a Senior Vice President of GlaxoSmithKline. In total, Peter’s career in GSK spanned over 20 years in various management positions. During his time there, he gained experience of marketing strategy development focusing primarily on the Asian market. He was also responsible for supporting the GlaxoWellcome and SmithKline Beecham merger, as well as organizational design for the post merger business. Sosei hopes to further enhance its business development by applying Peter’s knowledge and experience to the company management.

In addition to the above, President and CEO Shinichi Tamura, and Non-executive Directors Takuya Fujii, Isao Muramatsu, and Dr. Declan Doogan have been recommended for re-appointment to the board.