SANTA CLARA, Calif.--(BUSINESS WIRE)--XenoPort, Inc. (Nasdaq: XNPT) announced today the pricing of an underwritten public offering of 2,500,000 shares of its common stock at a price to the public of $19.00 per share. XenoPort has granted the underwriters a 30-day option to purchase up to an additional 375,000 shares of common stock to cover over-allotments, if any.