06/25/2013

PTC Therapeutics Closes Initial Public Offering

South Plainfield, NJ, June 25, 2013 -- PTC Therapeutics, Inc. (PTC) (NASDAQ: PTCT) today announced the closing of its initial public offering of 9,627,800 shares of common stock at a public offering price of $15.00 per share, before underwriting discounts, including 1,255,800 shares of common stock issued upon the exercise in full by the underwriters of their option to purchase additional shares at the public offering price, less the underwriting discount.

J.P. Morgan and Credit Suisse acted as joint book-running managers for the offering. Cowen and Company acted as co-lead manager and Wedbush PacGrow Life Sciences as co-manager.

A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on June 19, 2013. Copies of the final prospectus relating to this offering may be obtained from J.P. Morgan Securities LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717; telephone: 866-803-9204; or Credit Suisse Securities (USA) LLC, Attn: Prospectus Department, One Madison Avenue, New York, NY 10010; telephone: 800-221-1037; email:newyork.prospectus@credit-suisse.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, these 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 PTC Therapeutics, Inc.

PTC is a biopharmaceutical company focused on the discovery and development of orally administered small-molecule drugs that target post-transcriptional control processes. Post-transcriptional control processes regulate the rate and timing of protein production and are of central importance to proper cellular function. PTC's internally discovered pipeline addresses multiple therapeutic areas, including rare genetic disorders and infectious diseases.