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nanotechnology arrowhead pasadena california nasdaq arwr nanotechnology arrowhead pasadena california nasdaq arwr nanotechnology arrowhead pasadena california nasdaq arwr compound semiconductor materials nano particles laboratory
PRESS RELEASE
November 2, 2007

Arrowhead and Subsidiary, Unidym, to Present at Global Crown Capital Nanotechnology Investment Conference

PASADENA, Calif.– November 2, 2007 – Arrowhead Research Corporation (Nasdaq: ARWR), announced today that its Chairman and CEO, R. Bruce Stewart, has been selected to present at Global Crown Capital’s Nanotechnology Investment Conference in San Francisco on Thursday, November 8, 2007. Mr. Stewart’s presentation entitled “Nanotechnology: Here and Now” will highlight how Arrowhead’s unique business model leverages university nanotechnology into capital efficient nanotech companies making products for electronics, energy and life sciences.

In addition, Arthur L. Swift, President and CEO of Unidym, Inc., will be presenting at the conference on Wednesday, November 7, 2007. Mr. Swift’s presentation entitled “Nanotechnology in the Post-Silicon Era” details Unidym’s view of carbon nanotechnology and the nanotube-based applications that the company is pioneering. . Unidym is one of Arrowhead’s five majority-owned subsidiaries and produces a conductive, transparent film using networks of carbon nanotubes. This film has immediate application and advantages in touch screens and flat panel displays, as well as potential for thin film solar, fuel cells and printed electronics. Unidym owns the leading patent portfolio for carbon nanotube technology and production and is a leading manufacturer of pure carbon nanotubes that are supplied to a variety of researchers and product developers.

About Arrowhead Research Corporation

Arrowhead Research Corporation (www.arrowheadresearch.com) is a publicly-traded nanotechnology company commercializing new technologies in the areas of life sciences, electronics, and energy. Arrowhead is building value for shareholders through the progress of majority owned subsidiaries founded on nanotechnologies originally developed at universities. The company works closely with universities to source early stage deals and to generate rights to intellectual property covering promising new nanotechnologies. Currently, Arrowhead has five subsidiaries commercializing nanotech products and applications, including anti-cancer drugs, RNAi therapeutics, fullerene anti-oxidants, carbon-based electronics and compound semiconductor materials.

About Unidym, Inc.

Unidym (www.unidym.com) is a leader in the manufacture and application of carbon nanotubes (CNTs), a novel material with extraordinary electrical, thermal, and mechanical properties. Unidym provides bulk materials, CNT-enabled products, and intellectual property to a wide range of customers and business partners. As a result of its recent merger with CNI, Unidym possesses a foundational patent portfolio that covers nearly every aspect of CNT manufacturing and processing as well as multiple product applications.

Unidym is focused on the electronics industry where its initial products include transparent electrodes for touch screens, flat panel displays, solar cells, and solid state lighting; electrodes for fuel cells; and thin film transistors for printable electronics. Unidym is also pursuing a cross-industry partnership strategy to capture value from the wide ranging uses of CNTs. Unidym’s licensing program, technical expertise and manufacturing facilities can enable partners to rapidly develop CNT solutions for their specific applications.

Unidym is a majority-owned subsidiary of Arrowhead Research Corporation (NASDAQ: ARWR) For more information about Arrowhead, please visit www.arrowheadresearch.com.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:

This news release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. These statements are based upon our current expectations and speak only as of the date hereof. Our actual results may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including the recent economic slowdown affecting technology companies, the future success of our scientific studies, our ability to successfully develop products, rapid technological change in our markets, changes in demand for our future products, legislative, regulatory and competitive developments and general economic conditions. Our Annual Report on Form 10-K and 10-K/A, recent and forthcoming Quarterly Reports on Form 10-Q and 10-Q/A, recent Current Reports on Forms 8-K and 8-K/A, our Registration Statement on Form S-3, and other SEC filings discuss some of the important risk factors that may affect our business, results of operations and financial condition. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

Contacts

Virginia Dadey; Vice President, Investor Relations
Telephone: 212.541.3707
Email: vdadey@arrowres.com

Robert Bismuth, Vice President
Telephone: 650.462.1935
Email: pr@unidym.com