Receptos Announces Pricing of Initial Public Offering of Common Stock

Receptos, Inc. (Nasdaq:RCPT), a biopharmaceutical company developing therapeutic candidates for the treatment of immune and metabolic diseases, today announced the pricing of its initial public offering of 5,200,000 shares of its common stock at an initial public offering price of $14.00 per share. The shares of Receptos' common stock are expected to begin trading on the Nasdaq Global Market under the symbol "RCPT" on May 9, 2013. All of the shares of common stock are being offered by Receptos. In addition, Receptos has granted the underwriters a 30-day option to purchase up to an additional 780,000 shares of common stock to cover over-allotments, if any. The offering is expected to close on May 14, 2013, subject to customary closing conditions.

Credit Suisse Securities (USA) LLC, Leerink Swann LLC and BMO Capital Markets are acting as joint book-running managers for the offering. Wedbush PacGrow Life Sciences is acting as a co-manager.

A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on May 8, 2013. The offering is being made only by means of a prospectus. Copies of the prospectus relating to the offering may be obtained from Credit Suisse Securities (USA) LLC, Attention: Prospectus Department, One Madison Avenue, New York, NY 10010, Telephone: [phone], Email: [e-mail]; from Leerink Swann LLC, Attention: Syndicate Department, One Federal Street, 37th Floor, Boston, MA 02110, Telephone: [phone], Email: [e-mail]; or from BMO Capital Markets, Attention: Equity Syndicate Department, 3 Times Square, New York, NY 10036, Telephone: [phone], Email: [e-mail].

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 state or other jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction.

About Receptos

Receptos is a biopharmaceutical company developing therapeutic candidates for the treatment of immune and metabolic diseases. The company's lead program, RPC1063, is a sphingosine 1-phosphate 1 receptor (S1P1R) small molecule modulator candidate for immune indications, including relapsing multiple sclerosis (RMS) and inflammatory bowel disease (IBD). The company is also developing RPC4046, an anti-interleukin-13 (IL-13) antibody for an allergic/immune-mediated orphan disease, eosinophilic esophagitis (EoE). Receptos has established expertise in high resolution protein crystal structure determination, biology and drug discovery for G-protein-coupled receptors (GPCRs).

CONTACT: Media and Investor Contact:
         Graham K. Cooper
         Chief Financial Officer, Receptos
         [phone]
         [e-mail]