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News Release

FOR IMMEDIATE RELEASE
May 13, 2003

Notice Concerning Acquisition of the Company's Own Shares in the Market
(Based on Japanese Commercial Code 210 Concerning Share Acquisition)

Listed Stock Name : Eisai Co., Ltd.
President & CEO : Mr. Haruo Naito
Headquarters Location : 4-6-10 Koishikawa Bunkyo-ku, Tokyo
Securities Code : 4 5 2 3
Listed Locations : First Sections of the Tokyo Stock Exchange
& the Osaka Securities Exchange
Inquiries: Mr. Nobuo Deguchi
Corporate Officer (Vice President)
Public Relations & Legal Affairs
Phone 81-3-3817-5190

Notice Concerning Acquisition of the Company's Own Shares in the Market
(Based on Japanese Commercial Code 210 Concerning Share Acquisition)


Eisai Co. Ltd. announces that at the Board of Directors' Meeting held on May 13, 2003 a resolution was approved to propose to the 91st General Shareholders' Meeting on June 24, 2003 the acquisition of own shares in accordance with Japanese Commercial Code 210. Details of the proposal are noted below.


I1 . Reason for the Share Acquisition

In response to changes in the external environment and in order to increase the flexibility of capital policy, the Company proposes to acquire its own shares in the market in accordance with Commercial Code 210.
II 2. Contents of the Acquisition
(1) Share Type Acquisition Common Stock
(2) Number of Shares to be Acquired 7 million shares (maximum)
(2.36% of total issued shares)
(3) Total Value of Shares to be Acquired yen20 billion (maximum)

(Note)

The above proposal concerning "Acquisition of the Company's Own Shares" is subject to approval at the General Shareholders' Meeting to be held on June 24, 2003.