Idera Pharmaceuticals, Inc. (NASDAQ: IDRA) (“Idera” or, the “Company”) today announced the closing of its previously announced underwritten public offering of 13,727,251 shares of common stock, and pre-funded warrants to purchase up to an aggregate of 4,175,975 shares of common stock. The gross proceeds to Idera from this offering are expected to be approximately $27.7 million, before deducting the underwriting discounts and commissions and other estimated offering expenses payable by Idera and excluding the proceeds, if any, from the exercise of the pre-funded warrants. Piper Jaffray & Co. acted as sole manager for the offering. The offering was made pursuant to a shelf registration statement previously filed with and declared effective by the Securities and Exchange Commission (the “SEC”) on September 18, 2013. Copies of the final prospectus relating to the offering may be obtained from the Securities and Exchange Commission website at http://www.sec.gov, or from the underwriters at Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, J12S03, Minneapolis, MN 55402, via telephone at 800-747-3924 or email at firstname.lastname@example.org. This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of Idera’s securities. No offer, solicitation or sale will be made in any jurisdiction in which such offer, solicitation or sale is unlawful. About Idera Pharmaceuticals, Inc. Idera's technology platform involves creating novel synthetic RNA- and DNA-based compounds to modulate immune responses. Idera has applied this platform to develop proprietary Toll-like receptor (TLR) antagonists as immunomodulatory drug candidates. Toll-like receptor antagonists block the overactivation of immune factors which can cause a range of pathological effects. Idera is conducting clinical development of TLR antagonists in autoimmune and inflammatory diseases, and preclinical development of their use in certain genetically defined forms of B-cell lymphoma. More information on Idera is available at iderapharma.com.