Press Release Details

WATERTOWN, Mass., November 6, 2012 — Enanta Pharmaceuticals, Inc., a research and development-focused biotechnology company dedicated to creating small molecule drugs in the infectious disease field, announced that it has publicly filed a registration statement with the U.S. Securities and Exchange Commission (SEC) relating to the proposed initial public offering of its common stock. Enanta previously submitted its registration statement to the SEC on a confidential basis under the Jumpstart Our Business Startups (JOBS) Act of 2012. The number of shares to be offered and the price range for the offering have not been determined.

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

A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective. This news release shall not constitute an offer to sell or a 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 registration or qualification under the securities laws of any such state or jurisdiction.

The offering will be made only by means of a prospectus. When available, copies of the preliminary 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.

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 Abbott), 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. Enanta is a privately-held company headquartered in Watertown, Massachusetts.

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