Press Release Details

WATERTOWN, Mass., March 20, 2013 — Enanta Pharmaceuticals, Inc. (NASDAQ: ENTA), a research and development-focused biotechnology company dedicated to creating small molecule drugs in the infectious disease field, today announced the pricing of its initial public offering of 4,000,000 shares of its common stock at a price to the public of $14.00 per share. The shares of Enanta’s common stock will trade on the NASDAQ Global Select Market under the symbol “ENTA” beginning on March 21, 2013. All of the shares of common stock are being offered by Enanta. In addition, Enanta has granted the underwriters a 30-day option to purchase up to an additional 600,000 shares of common stock to cover over-allotments, if any. The offering is expected to close on March 26, 2013, subject to customary closing conditions.

J.P. Morgan Securities LLC and Credit Suisse Securities (USA) LLC are acting as joint book-running managers for the offering. Leerink Swann LLC and JMP Securities LLC are acting as co-managers.

A registration statement relating to these securities was declared effective by the Securities and Exchange Commission on March 20, 2013.

The offering will be made only by means of a prospectus. Copies of the prospectus relating to the offering may be obtained from J.P. Morgan Securities LLC via Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, or by calling toll-free (866) 803-9204; or Credit Suisse Securities (USA) LLC, Attention: Prospectus Department, One Madison Avenue, New York, NY 10010, or by calling toll-free (800) 221-1037, or by emailing 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 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 Enanta
Enanta Pharmaceuticals is a research and development-focused biotechnology company that uses its robust chemistry-driven approach and drug discovery capabilities to create small molecule drugs in the infectious disease field. Enanta is discovering and developing novel inhibitors designed for use against the hepatitis C virus (HCV). These inhibitors include members of the direct acting antiviral (DAA) inhibitor classes – protease (partnered with AbbVie), NS5A (partnered with Novartis) and nucleotide polymerase – as well as a host-targeted antiviral (HTA) inhibitor class targeted against cyclophilin. Additionally, Enanta has created a new class of antibiotics, called Bicyclolides, for the treatment of multi-drug resistant bacteria, with a current focus on developing an intravenous and oral treatment for hospital and community MRSA (methicillin-resistant Staphylococcus aureus) infections.

Certain statements in this press release may constitute “forward-looking statements”. These statements are made on the basis of current expectations, forecasts and assumptions that involve risks and uncertainties, including, but not limited to, economic, competitive, governmental and technological factors outside of our control, that may cause our business, strategy or actual results to differ materially from those expressed or implied. We do not intend, and undertake no obligation, to update any forward-looking statements, whether as a result of new information, future events or otherwise.

Investor Contact
Carol Miceli
Enanta Pharmaceuticals, Inc.
617-607-0710
cmiceli@enanta.com

Media Contact
Kari Watson
MacDougall Biomedical Communications
781-235-3060
kwatson@macbiocom.com