Horizon Pharma Prices IPO

NORTHBROOK, IL. – July 28, 2011 – Horizon Pharma, Inc. (Nasdaq: HZNP)  today announced the pricing of its initial public offering of 5,500,000  shares of common stock at a price to the public of $9.00 per share.   Horizon’s common stock is scheduled to begin trading on The NASDAQ  Global Market on July 28, 2011 under the symbol “HZNP.”  Horizon has  also granted the underwriters a 30-day option to purchase up to an  additional 825,000 shares at the initial public offering price to cover  overallotments, if any.

Stifel Nicolaus Weisel, Cowen and Company and JMP Securities LLC are acting as joint bookrunners for the offering.

A registration statement relating to these securities was declared  effective by the Securities and Exchange Commission on July 28, 2011.   The offering of these securities is being made only by means of a  prospectus, copies of which may be obtained from: Stifel, Nicolaus &  Company, Incorporated, One Montgomery Street, Suite 3700, San  Francisco, California 94104, or by calling (415) 364-2720; Cowen and  Company, LLC c/o Broadridge Financial Services, 1155 Long Island Avenue,  Edgewood, NY,11717, Phone (631) 274-2806 / Fax (631) 254-7140; or JMP  Securities LLC, 600 Montgomery Street, Suite 1100, San Francisco, CA  94111, or by calling (415) 835-8985 .

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

About Horizon Pharma
Horizon Pharma, Inc. is a biopharmaceutical company that is developing  and commercializing innovative medicines to target unmet therapeutic  needs in arthritis, pain and inflammatory diseases.  For more  information, please visit www.horizonpharma.com.