Arena Pharmaceuticals, Inc. Announces Public Offering Of Common Stock

SAN DIEGO, Nov. 28 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. announced today that it plans to publicly offer 8,000,000 shares of its common stock pursuant to an effective registration statement previously filed with the Securities and Exchange Commission. In connection with this offering, Arena plans to grant to the underwriters a 30-day option to purchase up to an additional 1,200,000 shares of common stock to cover over-allotments, if any. All of the shares are being offered by Arena. CIBC World Markets Corp. is acting as sole book-running manager in this offering. Cowen and Company, LLC and Piper Jaffray & Co. are acting as co-lead managers. Needham & Company, LLC, Leerink Swann & Co., Inc., Fortis Securities LLC, Morgan Joseph & Co. Inc. and Oppenheimer & Co. Inc. are acting as co-managers.

The securities may not be sold nor may offers to buy be accepted prior to the time that a final prospectus supplement is filed with the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. Copies of the preliminary prospectus may be obtained from CIBC World Markets Corp. by email at useprospectus@us.cibc.com by fax at 212-667-6303, or by mail at CIBC World Markets Corp., Attn: USE Prospectus Department, 9th floor, 622 3rd Ave., NY, NY 10016.

Contacts: Jack Lief Carolyn Wang President and CEO WeissComm Partners Media Relations 415.946.1065 David Walsey Director, Corporate Communications Arena Pharmaceuticals, Inc. 858.453.7200, ext. 1479 www.arenapharm.com

Arena Pharmaceuticals, Inc.

CONTACT: Jack Lief, President and CEO, or David Walsey, Director,Corporate Communications, both of Arena Pharmaceuticals, Inc.,+1-858-453-7200, ext. 1479; or Carolyn Wang of WeissComm Partners, MediaRelations, +1-415-946-1065, for Arena Pharmaceuticals, Inc.

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