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News Release

FOR IMMEDIATE RELEASE
July 30, 2004

Notice Concerning Acquisition of the Company's Own Shares
(Pursuant to paragraph 1, item 2 of Article 211-3 of the Japanese Commercial Code
concerning acquisition of own shares)

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
Vice President
Corporate Communications
Phone: +81-3-3817-5085


Notice Concerning Acquisition of the Company's Own Shares
(Pursuant to paragraph 1, item 2 of Article 211-3 of the Japanese Commercial Code
concerning acquisition of own shares)



Eisai Co., Ltd. (hereinafter referred to as "Eisai") announced that the Board of Directors resolved on July 30, 2004 an acquisition of own shares pursuant to paragraph 1, item 2 of Article 211-3 of the Japanese Commercial Code. Details are noted below.



I. Reason for acquiring Eisai's own shares

For the purpose of implementing a flexible capital policy to cope with the changes in business environment in accordance with the Company's articles of incorporation.
II. Details of acquisition

(1) Type of shares to be acquired Eisai's Common Stock
(2) Numbers of shares to be acquired 5 million shares (maximum)
(Percentage to total number of issued shares: 1.7%)
(3) Total amount of shares to be acquired yen15 billion (maximum)
(4) Schedule for acquisition of Eisai's own shares From July 30, 2004 to
March 31, 2005



(Reference)

Status of treasury stock as of June 30, 2004

Total number of issued shares
(excluding treasury stock)
287,772,438 shares

Treasury stock8,794,511 shares