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 to Acquire Own Shares

Tokyo, June 1, 2007 - DAIICHI SANKYO COMPANY, LIMITED has announced today that its Board of Directors reached a decision to acquire shares issued by the company pursuant to Article 156 of the Corporate Code (Act No. 86 of 2005), applied for the situation provided in Article 165, Paragraph 3. This acquisition is to ensure more efficient use of capital and reward shareholders.

Pursuant to Article 165, Paragraph 2, of the Corporate Code, DAIICHI SANKYO has stipulated in its Articles of Incorporation that the company can acquire its own shares at any time following a decision by its Board of Directors.

Details of Share Acquisition

1. Type
The shares to be acquired are ordinary shares.
2. Quantity
The maximum number of shares to be acquired is 10 million shares, corresponding to 1.36% of outstanding shares.
3. Price
The maximum total acquisition price is 35.0 billion yen.
4. Acquisition period
The shares will be acquired between June 4 and July 30, 2007.