6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

450, 5th Street

Washington, D.C. 20549

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of May, 2006

Daiichi Sankyo Company, Limited

(Translation of registrant’s name into English)

5-1, Nihonbashi 3-chome

Chuo-ku, Tokyo 103-8426

Japan

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  þ            Form 40-F  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes  ¨            No  þ

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes  ¨            No  þ

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ¨            No  þ

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	DAIICHI SANKYO COMPANY, LIMITED
DATE: May 30, 2006	By:	/s/ Takashi Shoda
	Name:	Takashi Shoda
	Title:	President and Representative Director

EXHIBIT INDEX

Exhibit Number		Description of Exhibit
99.1	—	Press Release: “DAIICHI SANKYO to Reduce Capital Reserves”

EX-99.1

Exhibit 99.1

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.co.jp/

DAIICHI SANKYO to Reduce Capital Reserves

Tokyo, May 26, 2006 – DAIICHI SANKYO COMPANY, LIMITED (hereinafter “DAIICHI SANKYO”) decided at its May 26, 2006 board of directors meeting that a reduction in capital reserves will be tabled for discussion at the company’s first general ordinary meeting of shareholders scheduled for June 29, 2006.

1. Purpose of reducing capital reserves

In accordance with the provisions outlined in Article 448, Paragraph 1 of the Japanese Corporate Law, DAIICHI SANKYO will reduce its capital reserves for transfer to other capital surplus. The company intends to implement more flexible and strategic capital policy measures, such as by ensuring and reinforcing surplus available for dividends and repurchasing its own shares.

2. Amount of capital reserves to be reduced

903,491,489,399 yen

(As the reduction amount will be transferred to other capital surplus, the sum total of the capital account will not change.)

3. Schedule for capital reserves reduction
(1) Resolution at board of directors meeting	May 26, 2006
(2) Resolution at general ordinary meeting of shareholders
	June 29, 2006 (tentative)
(3) Creditor objection deadline	August 14, 2006 (tentative)
(4) Proposed effective date	August 15, 2006 (tentative)

This capital reserves reduction will not influence company performance.