Arena Pharmaceuticals, Inc. (ARNA)

[gixxer11]

Arena Pharmaceuticals Prices Public Offering of Common Stock

Arena Pharmaceuticals, Inc. (NASDAQ: ARNA) today announced the pricing of an underwritten public offering of 11,000,000 shares of its common stock, offered at a price to the public of $5.50 per share. The gross proceeds to Arena from this offering are expected to be $60.5 million, before deducting underwriting discounts and commissions and other estimated offering expenses payable by Arena. Arena has granted the underwriters a 30-day option to purchase up to an aggregate of 1,650,000 additional shares of common stock to cover over-allotments, if any. The offering is expected to close on or about May 21, 2012, subject to customary closing conditions. Arena anticipates using the net proceeds from the offering for general corporate purposes, which may include expenses related to the commercialization of lorcaserin, if approved, as well as for research and development expenses, capital expenditures, working capital, and general and administrative expenses.

Jefferies & Company, Inc. and Piper Jaffray & Co. are acting as joint book-running managers for the offering. BMO Capital Markets is acting as a co-manager for the offering.

A registration statement relating to the shares described above was previously filed with and has become effective by rule of the Securities and Exchange Commission (SEC). A final prospectus supplement related to the offering will be filed with the SEC and will be available on the SEC's website located at http://www.sec.gov. Copies of the final prospectus supplement and the accompanying prospectus relating to this offering, when available, may be obtained from Jefferies & Company, Inc., Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, 12th floor, New York, NY 10022 or by telephone at 877-547-6340 or by email at [e-mail], or Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, J12S03, Minneapolis, MN 55402 or by telephone at 800-747-3924 or by email at [e-mail].

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction.

About Arena Pharmaceuticals

Arena is a clinical-stage biopharmaceutical company focused on discovering, developing and commercializing oral drugs that target G protein-coupled receptors, an important class of validated drug targets, in four major therapeutic areas: cardiovascular, central nervous system, inflammatory and metabolic diseases.