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News Release

FOR IMMEDIATE RELEASE
February 2, 2004

Notice Concerning the Acquisition of the Company's Own Shares through ToSTNeT-2

Listed Stock Name:  Eisai Co., Ltd.
President & CEO: Mr. Haruo Naito
Headquarters: 4-6-10 Koishikawa Bunkyo-ku, Tokyo
Securities Code: 4523
Listed Locations: First Sections of the Tokyo Stock Exchange
& the Osaka Securities Exchange
Inquiries: Mr. Hiroyuki Mitsui
Corporate Officer
Public Relations
Phone 81-3-3817-5085

Notice Concerning the Acquisition of the Company's Own Shares
through ToSTNeT-2

Eisai Co., Ltd. announces the decision on the method of acquisition of own shares in accordance with the Japanese Commercial Law 210. Details are noted below.

I1. Method of Acquisition

Shares will be purchased at the Tokyo Stock Exchange at 8:45 in the morning of February 3, 2004 by a closing price of yen2,850 per share as of today, February 2, 2004. Transactions (closing price transaction) will be made through ToSTNeT-2, and shall not be made by other trading systems nor at another time. The purchase order will be valid only at the time designated for transactions.
 
II2. Contents of the Acquisition

(1) Type of the Share to be AcquiredCommon Stock

(2) Total Number of Shares to be Acquired4 million shares (maximum)

(Note 1) This number is final. Depending on market fluctuations and other factors, a part or all of the transaction may not be performed.
(Note 2) The purchase is to be made by selling orders corresponding to the number of shares planned to be acquired.
III3. Acquisition Disclosure

When the purchase has been completed at 8:45 on February 3, 2004, the result of the transaction will be disclosed.

(Reference)
The resolution related to the acquisition of the Company's shares at the 91st General Shareholders' Meeting held on June 24, 2003.

(1)Type of the Share to be Acquired Common Stock

(2)Total Number of Shares to be Acquired 7 million shares (maximum)

(3)Total Value of Shares to be Acquired 20 billion (maximum)

Total number of shares acquired on or after the date of the General Shareholders' Meeting held on June 24, 2003 as of February 2, 2004.

(1)Total Number of Shares Acquired 0

(2)Total Value of Shares Acquired yen0