Assembly Biosciences Announces Proposed Public Offering of Common Stock

March 18, 2015

NEW YORK, March 18, 2015 (GLOBE NEWSWIRE) -- Assembly Biosciences, Inc. (Nasdaq:ASMB) ("Assembly") announced today that it is commencing an underwritten public offering of its common stock pursuant to an effective shelf registration statement that was previously filed with the Securities and Exchange Commission. All of the shares in the offering are to be sold by Assembly. The offering is subject to market conditions and other factors, and there can be no assurance as to whether or when the offering may be completed.

Credit Suisse and William Blair are acting as joint lead book-running managers for the offering. Assembly intends to grant the underwriters a 30-day option to purchase up to an additional 15 percent of the amount sold to cover over-allotments, if any.

Before investing in the offering, interested parties may read the prospectus supplement and the accompanying prospectus for the offering and the other documents Assembly has filed with the SEC, which are incorporated by reference in the prospectus supplement and the accompanying prospectus for the offering and provide more complete information about Assembly and the offering. Copies of the preliminary prospectus supplement and the accompanying prospectus relating to the offering may be obtained from: Credit Suisse Securities (USA) LLC, Attn: Prospectus Department, One Madison Avenue, New York, NY 10010; telephone: 800-221-1037; email:; or William Blair & Company, L.L.C., Attention: Prospectus Department, 222 West Adams Street, Chicago, IL 60606, by telephone at (800) 621-0687, or by e-mail at

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. Any offer, if at all, will be made only by means of a prospectus supplement and the accompanying prospectus, forming a part of the registration statement.

About Assembly Biosciences

Assembly Biosciences, Inc. is a public biopharmaceutical company developing novel oral therapies for the cure of intractable infectious diseases, focusing on hepatitis B virus (HBV) and C. difficile-associated infections (CDAD). Its HBV-Cure research team is discovering and developing multiple core protein allosteric modifiers (CpAMs) with the potential to modulate the HBV core protein—a polyfunctional essential viral protein—at multiple complementary points in the viral lifecycle. The goal is to eradicate the infection with an orally-administered regimen. Assembly is uniquely positioned to execute on this strategy, with a senior scientific team that has over 30 years of combined experience working on HBV. The company's CDAD program is based on the targeted delivery of novel microbiome-based therapies in a
proprietary oral formulation. Assembly has created a network of recognized microbiome scientists from academia and industry to help advance this innovative program. For more information visit

Cautionary Statement Regarding Forward-Looking Statements

Please Note: The information provided herein contains estimates and other forward-looking statements regarding future events. Such statements are just predictions and are subject to risks and uncertainties that could cause the actual events or results to differ materially. These risks and uncertainties include, among others: our ability to complete the offering, including the satisfaction of the closing conditions for the offering; the estimated proceeds from the offering and our use of the anticipated proceeds from the offering; the scientific bases, costs, timing, regulatory review and results of our preclinical studies and clinical trials and other development activities involving our product candidates; the unpredictability of the clinical development of our product candidates and of the duration and results of regulatory review of those candidates by the
and foreign regulatory authorities; our anticipated capital expenditures, our estimates regarding our capital requirements, and our need for future capital; our ability to retain necessary employees and to staff our operations appropriately; and the possible impairment of, or inability to obtain, intellectual property rights and the costs of obtaining such rights from third parties. The reader is referred to the documents that we file from time to time with the Securities and Exchange Commission.

CONTACT: Corporate:

         Assembly Biosciences, Inc.

         David Barrett



         BLL Partners LLC

         Barbara Lindheim


Assembly Biosciences logo

Source: Assembly Biosciences

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