The prospectus, forming part of the effective registration statement, and prospectus supplement relating to this offering contain this and other information about the Company. The offering is being made only by means of the prospectus and the related prospectus supplement, copies of which may be obtained from Rodman & Renshaw, LLC. by calling 212-201-8064 or by email at firstname.lastname@example.org.About Arrowhead Research Corporation Arrowhead Research Corporation is a clinical stage targeted therapeutics company with development programs in oncology, obesity, and infectious disease. The company leverages its platform technologies to design and develop peptide-drug conjugates (PDCs) which specifically home to cell types of interest while sparing off-target tissues, creates targeted drugs based on the gene silencing RNA interference (RNAi) mechanism, and works with partners to create improved versions of traditional small molecule drugs. For more information please visit http://www.arrowheadresearch.com, or follow us on Twitter @ArrowRes. To be added to the Company's email list to receive news directly, please send an email to email@example.com.