For Immediate Release

Company name: DAIICHI SANKYO COMPANY, LIMITED
Representative: Takashi Shoda, President and Representative Director
(Code no.: 4568, First Section, Tokyo, Osaka and Nagoya Stock Exchanges)
Please address inquiries to Toshio Takahashi, Corporate Officer in Charge,
Corporate Communications Department
Telephone: +81-3-6225-1126
http://www.daiichisankyo.com/

DAIICHI SANKYO Announces Results of Share Buyback

Tokyo, July 31, 2007 –　DAIICHI SANKYO COMPANY, LIMITED has announced today that it has acquired shares issued by the company. This is the final share acquisition following the resolution adopted by its Board of Directors on June 1,
2007.

Details of Share Acquisition
1. Type of shares: Ordinary shares issued by the company
2. Acquisition period: June 4 – July 30, 2007
3. Shares acquired: 10,000,000 shares (1.36% of outstanding shares)
4. Value:33,288,989,000 yen
5. Acquisition method: Open market purchase on the Tokyo Stock Exchange

Reference figures
Content of the resolution for acquisition of shares adopted by the Board on June 1, 2007

Type of shares: Ordinary shares issued by the company
Maximum number: 10 million shares
Maximum value: 35 billion yen
Acquisition period: June 4 – July 30, 2007