XenoPort, Inc. (Nasdaq:XNPT) announced today the pricing of an underwritten offering of 6,153,846 shares of its common stock at a price to the public of $6.50 per share. XenoPort has granted to the underwriters a 30-day option to purchase up to an additional 923,076 shares of its common stock. All of the shares in the offering are being offered by XenoPort. The offering is expected to close on or about July 30, 2012, subject to customary closing conditions. Credit Suisse Securities (USA) LLC is acting as sole book-running manager for the offering. RBC Capital Markets, LLC is acting as co-manager for the offering. A registration statement relating to the shares described above was previously filed with, and has been declared effective by, 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 Credit Suisse Securities (USA) LLC, Attention: Prospectus Department, One Madison Avenue, New York, NY 10010, or by telephone at (800) 221-1037, or by e-mail at email@example.com. 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, the shares in any state or other jurisdiction 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 XenoPort XenoPort is a biopharmaceutical company focused on developing and commercializing a portfolio of internally discovered product candidates for the potential treatment of neurological disorders. Horizant® (gabapentin enacarbil) Extended-Release Tablets is approved in the United States for the treatment of moderate-to-severe primary restless legs syndrome (RLS) in adults and for the management of postherpetic neuralgia in adults. GlaxoSmithKline holds commercialization rights and certain development rights for Horizant in the United States. Regnite® (gabapentin enacarbil) Extended-Release Tablets is approved for the treatment of RLS in Japan. Astellas Pharma Inc. holds all development and commercialization rights for Regnite in Japan and five other Asian countries. XenoPort holds all other world-wide rights and has co-promotion and certain development rights to gabapentin enacarbil in the United States. XenoPort’s pipeline of product candidates includes potential treatments for patients with spasticity, Parkinson’s disease and relapsing-remitting multiple sclerosis.