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News Release

FOR IMMEDIATE RELEASE
February 3, 2004

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


Eisai Co., Ltd. announces the acquisition of own shares made in accordance with the announcement of February 2, 2004. The transaction took place today as detailed below.

I1 . Type of the Share Acquired Common Stock
II2 . Total Number of Shares Acquired 4,000, 000
III3 . Total Amount of Acquisition yen11.4 billion
IV4 . Purchase Price yen2,850 per share
V5 . Date of Purchase February 3, 2004
VI6 . Method of Purchase Through ToSTNeT-2 (closing price transaction) of the Tokyo Stock Exchange

(Reference)

The resolution related to this acquisition at the 91st General Shareholders' Meeting held on June 24, 2003.
    (1) Type of the Share to be Acquired Common Stock
    (2) 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 3, 2004.
    (1) Total Number of Shares Acquired 4,000, 000
    (2) Total Value of Shares Acquired yen11.4 billion