—] Shares of Common Stock and Warrants to Purchase [—] Shares of Common Stock IDERA PHARMACEUTICALS, INC. PURCHASE AGREEMENTPurchase Agreement • April 23rd, 2013 • Idera Pharmaceuticals, Inc. • Biological products, (no disgnostic substances) • New York
Idera Pharmaceuticals, Inc., a Delaware corporation (the “Company”), proposes to sell to the several Underwriters named in Schedule I hereto (the “Underwriters”) an aggregate of (i) [—] authorized but unissued shares (the “Firm Shares”) of common stock, par value $0.001 per share (the “Common Stock”), of the Company and (ii) warrants of the Company, in the form set forth in Exhibit C hereto, to purchase [—] shares of Common Stock at an exercise price of $[—] per share (the “Firm Warrants”). Each Firm Share is being sold together with a Firm Warrant to purchase $[—] of a share of Common Stock at an exercise price of $[—] per share. The Company has also granted to the several Underwriters an option to purchase up to [—] additional shares of Common Stock (the “Option Shares”) and warrants to purchase up to an additional [—] shares of Common Stock at an exercise price of $[—] per share (the “Option Warrants”), on the terms and for the purposes set forth in Section 3 hereof. The Firm Shares
