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PRESS RELEASE
August 14, 2007

Arrowhead Subsidiary, Unidym, Inc., Appoints Semiconductor Industry Executive as Vice President of Business Development & Marketing

MENLO PARK, California – (BUSINESS WIRE) – Unidym Incorporated, a majority-owned subsidiary of Arrowhead Research Corporation (NASDAQ:ARWR), announced today that Robert Bismuth has been appointed Vice President of Business Development & Marketing. Unidym Inc. is a leader in the development and manufacture of carbon nanotubes for applications in the electronics industry. Unidym, which recently merged with Carbon Nanotechnologies, Incorporated (CNI), possesses a foundational patent portfolio that covers nearly every aspect of carbon nanotube manufacturing and processing.

“Robert has a track record of innovative business success in both building strategic relationships and in bringing to market new applications for a wide range of technologies,” said Art Swift, Unidym’s President & CEO. “The depth and breadth of his strategic business experience and intuitive understanding of technology will be of enormous benefit to Unidym as we expand our business.”

“The combination of Unidym’s application technology and carbon nanotube production capabilities clearly position the company strongly in many segments of the overall nanotechnology market,” commented Bismuth. “For example Unidym’s transparent, conductive films are poised to enable robust, innovative solutions in areas such as display technology, touch sensors, high performance solar cells, and may even make flexible electronics truly practical. In addition, the company’s IP portfolio and materials production capabilities provide attractive licensing and partnership opportunities within a wide variety of industries. Thus, I am extremely excited to join the Unidym team at this point in time.”

Robert’s versatile experience includes executive leadership within the software, hardware, Internet and semiconductor industries. Most recently, Robert held the position of Vice President of Strategic Alliances at Transmeta Corporation, an innovative semiconductor company in the Silicon Valley. Prior to Transmeta, Robert led several startup technology companies, following his long tenure at Digital Equipment Corporation where he served as the company’s Corporate Vice President for Strategic Alliances, holding responsibility for all major global business and technology alliances. Educated in the US, Europe and Canada, Robert earned a B.Sc. in Pure Mathematics at the University of Wales, followed by an M.Sc. at McMaster University in Canada. More recently Robert attended the Stanford Graduate School of Business, completing the Executive Program for Growing Companies.

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 four subsidiaries commercializing nanotech products and applications, including anti-cancer drugs, RNAi therapeutics, 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.

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

Art L. Swift, CEO Unidym, Inc.
Telephone: 650.462.1935
Email: aswift@unidym.com